import sqlite3
from sqlite3 import Error
import os
import subprocess
import platform
import serial.tools.list_ports
import random
import datetime
import time
import pages
import openplc
import monitoring as monitor
import sys
import ctypes
import socket
import mimetypes

import flask 
import flask_login

app = flask.Flask(__name__)
app.secret_key = str(os.urandom(16))
login_manager = flask_login.LoginManager()
login_manager.init_app(app)

openplc_runtime = openplc.runtime()

class User(flask_login.UserMixin):
    pass

# Allowed MIME types and magic numbers (file signatures)
IMAGE_MAGIC_NUMBERS = {
    b'\xFF\xD8\xFF': 'image/jpeg',  # JPEG
    b'\x89PNG\r\n\x1A\n': 'image/png',  # PNG
    b'GIF87a': 'image/gif',  # GIF87a
    b'GIF89a': 'image/gif',  # GIF89a
}

# Function to check MIME type and file signature
def is_allowed_file(file):
    # First, check the MIME type based on the file extension
    mime_type, _ = mimetypes.guess_type(file.filename)
    if mime_type not in IMAGE_MAGIC_NUMBERS.values():
        return False

    try:
        # Read the first 8 bytes of the file to determine its magic number
        file.seek(0)  # Ensure we're at the start of the file
        file_header = file.read(8)
        file.seek(0)  # Reset file pointer after reading

        # Check if the file header matches a known image format
        for magic, expected_mime in IMAGE_MAGIC_NUMBERS.items():
            if file_header.startswith(magic):
                return True

        return False
    except Exception:
        return False

def configure_runtime():
    global openplc_runtime
    database = "openplc.db"
    conn = create_connection(database)
    if (conn != None):
        try:
            print("Openning database")
            cur = conn.cursor()
            cur.execute("SELECT * FROM Settings")
            rows = cur.fetchall()
            cur.close()
            conn.close()

            for row in rows:
                if (row[0] == "Modbus_port"):
                    if (row[1] != "disabled"):
                        print("Enabling Modbus on port " + str(int(row[1])))
                        openplc_runtime.start_modbus(int(row[1]))
                    else:
                        print("Disabling Modbus")
                        openplc_runtime.stop_modbus()
                elif (row[0] == "Dnp3_port"):
                    if (row[1] != "disabled"):
                        print("Enabling DNP3 on port " + str(int(row[1])))
                        openplc_runtime.start_dnp3(int(row[1]))
                    else:
                        print("Disabling DNP3")
                        openplc_runtime.stop_dnp3()
                elif (row[0] == "Enip_port"):
                    if (row[1] != "disabled"):
                        print("Enabling EtherNet/IP on port " + str(int(row[1])))
                        openplc_runtime.start_enip(int(row[1]))
                    else:
                        print("Disabling EtherNet/IP")
                        openplc_runtime.stop_enip()
                elif (row[0] == "snap7"):
                    if (row[1] != "false"):
                        print("Enabling S7 Protocol")
                        openplc_runtime.start_snap7()
                    else:
                        print("Disabling S7 Protocol")
                        openplc_runtime.stop_snap7()
                elif (row[0] == "Pstorage_polling"):
                    if (row[1] != "disabled"):
                        print("Enabling Persistent Storage with polling rate of " + str(int(row[1])) + " seconds")
                        openplc_runtime.start_pstorage(int(row[1]))
                    else:
                        print("Disabling Persistent Storage")
                        openplc_runtime.stop_pstorage()
                        delete_persistent_file()
        except Error as e:
            print("error connecting to the database" + str(e))
    else:
        print("Error opening DB")


def delete_persistent_file():
    if (os.path.isfile("persistent.file")):
        os.remove("persistent.file")
    print("persistent.file removed!")


def generate_mbconfig():
    database = "openplc.db"
    conn = create_connection(database)
    if (conn != None):
        try:
            cur = conn.cursor()
            cur.execute("SELECT COUNT(*) FROM Slave_dev")
            row = cur.fetchone()
            num_devices = int(row[0])
            mbconfig = 'Num_Devices = "' + str(num_devices) + '"'
            cur.close()
            
            cur=conn.cursor()
            cur.execute("SELECT * FROM Settings")
            rows = cur.fetchall()
            cur.close()
                    
            for row in rows:
                if (row[0] == "Slave_polling"):
                    slave_polling = str(row[1])
                elif (row[0] == "Slave_timeout"):
                    slave_timeout = str(row[1])
                    
            mbconfig += '\nPolling_Period = "' + slave_polling + '"'
            mbconfig += '\nTimeout = "' + slave_timeout + '"'
            
            cur = conn.cursor()
            cur.execute("SELECT * FROM Slave_dev")
            rows = cur.fetchall()
            cur.close()
            conn.close()
            
            device_counter = 0
            for row in rows:
                mbconfig += """
# ------------
#   DEVICE """
                mbconfig += str(device_counter)
                mbconfig += """
# ------------
"""
                mbconfig += 'device' + str(device_counter) + '.name = "' + str(row[1]) + '"\n'
                mbconfig += 'device' + str(device_counter) + '.slave_id = "' + str(row[3]) + '"\n'
                if (str(row[2]) == 'ESP32' or str(row[2]) == 'ESP8266' or str(row[2]) == 'TCP'):
                    mbconfig += 'device' + str(device_counter) + '.protocol = "TCP"\n'
                    mbconfig += 'device' + str(device_counter) + '.address = "' + str(row[9]) + '"\n'
                else:
                    mbconfig += 'device' + str(device_counter) + '.protocol = "RTU"\n'
                    if (str(row[4]).startswith("COM")):
                        port_name = "/dev/ttyS" + str(int(str(row[4]).split("COM")[1]) - 1)
                    else:
                        port_name = str(row[4])
                    mbconfig += 'device' + str(device_counter) + '.address = "' + port_name + '"\n'
                mbconfig += 'device' + str(device_counter) + '.IP_Port = "' + str(row[10]) + '"\n'
                mbconfig += 'device' + str(device_counter) + '.RTU_Baud_Rate = "' + str(row[5]) + '"\n'
                mbconfig += 'device' + str(device_counter) + '.RTU_Parity = "' + str(row[6]) + '"\n'
                mbconfig += 'device' + str(device_counter) + '.RTU_Data_Bits = "' + str(row[7]) + '"\n'
                mbconfig += 'device' + str(device_counter) + '.RTU_Stop_Bits = "' + str(row[8]) + '"\n'
                mbconfig += 'device' + str(device_counter) + '.RTU_TX_Pause = "' + str(row[21]) + '"\n\n'
                
                mbconfig += 'device' + str(device_counter) + '.Discrete_Inputs_Start = "' + str(row[11]) + '"\n'
                mbconfig += 'device' + str(device_counter) + '.Discrete_Inputs_Size = "' + str(row[12]) + '"\n'
                mbconfig += 'device' + str(device_counter) + '.Coils_Start = "' + str(row[13]) + '"\n'
                mbconfig += 'device' + str(device_counter) + '.Coils_Size = "' + str(row[14]) + '"\n'
                mbconfig += 'device' + str(device_counter) + '.Input_Registers_Start = "' + str(row[15]) + '"\n'
                mbconfig += 'device' + str(device_counter) + '.Input_Registers_Size = "' + str(row[16]) + '"\n'
                mbconfig += 'device' + str(device_counter) + '.Holding_Registers_Read_Start = "' + str(row[17]) + '"\n'
                mbconfig += 'device' + str(device_counter) + '.Holding_Registers_Read_Size = "' + str(row[18]) + '"\n'
                mbconfig += 'device' + str(device_counter) + '.Holding_Registers_Start = "' + str(row[19]) + '"\n'
                mbconfig += 'device' + str(device_counter) + '.Holding_Registers_Size = "' + str(row[20]) + '"\n'
                device_counter += 1
                
            with open('./mbconfig.cfg', 'w+') as f: f.write(mbconfig)
            
        except Error as e:
            print("error connecting to the database" + str(e))
    else:
        print("Error opening DB")
                

    
def draw_top_div():
    global openplc_runtime
    top_div = ("<div class='top'>"
    "<img src='/static/logo-openplc.png' alt='OpenPLC' style='width:63px;height:50px;padding:0px 0px 0px 10px;float:left'>")
    
    if (openplc_runtime.status() == "Running"):
        top_div += "<h3 style='font-family:\"Roboto\", sans-serif; font-size:18px; color:white; padding:13px 111px 0px 0px; margin: 0px 0px 0px 0px'><center><span style='color: #02EE07'>Running: </span>" + openplc_runtime.project_name + "</center></h3>"
    elif (openplc_runtime.status() == "Compiling"):
        top_div += "<h3 style='font-family:\"Roboto\", sans-serif; font-size:18px; color:white; padding:13px 111px 0px 0px; margin: 0px 0px 0px 0px'><center><span style='color: Yellow'>Compiling: </span>" + openplc_runtime.project_name + "</center></h3>"
    else:
        top_div += "<h3 style='font-family:\"Roboto\", sans-serif; font-size:18px; color:white; padding:13px 111px 0px 0px; margin: 0px 0px 0px 0px'><center><span style='color: Red'>Stopped: </span>" + openplc_runtime.project_name + "</center></h3>"
    
    top_div += "<div class='user'><img src='"
    if (flask_login.current_user.pict_file == "None"):
        top_div += "/static/default-user.png"
    else:
        top_div += flask_login.current_user.pict_file
    
    top_div += "' alt='User' style='width:50px;height:45px;padding:5px 5px 0px 5px;float:right'>"
    top_div += "<h3 style='font-family:\"Roboto\", sans-serif; font-size:18px; color:white; padding:13px 0px 0px 0px; margin: 0px 0px 0px 0px'>" + flask_login.current_user.name + "</h3>"
    top_div += "</div></div>"
    
    return top_div    


def draw_status():
    global openplc_runtime
    status_str = ""
    if (openplc_runtime.status() == "Running"):
        status_str = "<center><h3 style='font-family:\"Roboto\", sans-serif; font-size:18px; color:white; padding:0px 0px 0px 0px;'>Status: <i>Running</i></span></center></h3>"
        status_str += "<a href='stop_plc' class='button' style='width: 210px; height: 53px; margin: 0px 20px 0px 20px;'><b>Stop PLC</b></a>"
    else:
        status_str = "<center><h3 style='font-family:\"Roboto\", sans-serif; font-size:18px; color:white; padding:0px 0px 0px 0px;'>Status: <i>Stopped</i></span></center></h3>"
        status_str += "<a href='start_plc' class='button' style='width: 210px; height: 53px; margin: 0px 20px 0px 20px;'><b>Start PLC</b></a>"
    
    return status_str    


def draw_blank_page():
    return_str = pages.w3_style + pages.dashboard_head + draw_top_div() + """
            <div class='main'>
                <div class='w3-sidebar w3-bar-block' style='width:250px; background-color:#1F1F1F'>
                    <br>
                    <br>
                    <div class="w3-bar-item"><img src="/static/home-icon-64x64.png" alt="Dashboard" style="width:47px;height:32px;padding:0px 15px 0px 0px;float:left"><p style='font-family:"Roboto", sans-serif; font-size:20px; color:white;margin: 2px 0px 0px 0px'>Dashboard</p></div>
                    <div class="w3-bar-item"><img src='/static/programs-icon-64x64.png' alt='Programs' style='width:47px;height:32px;padding:0px 15px 0px 0px;float:left'><p style='font-family:\"Roboto\", sans-serif; font-size:20px; color:white;margin: 2px 0px 0px 0px'>Programs</p></div>
                    <div class="w3-bar-item"><img src='/static/modbus-icon-512x512.png' alt='Modbus' style='width:47px;height:32px;padding:0px 15px 0px 0px;float:left'><p style='font-family:\"Roboto\", sans-serif; font-size:20px; color:white;margin: 2px 0px 0px 0px'>Slave Devices</p></div>
                    <div class="w3-bar-item"><img src='/static/monitoring-icon-64x64.png' alt='Monitoring' style='width:47px;height:32px;padding:0px 15px 0px 0px;float:left'><p style='font-family:\"Roboto\", sans-serif; font-size:20px; color:white;margin: 2px 0px 0px 0px'>Monitoring</p></div>
                    <div class="w3-bar-item"><img src='/static/hardware-icon-980x974.png' alt='Hardware' style='width:47px;height:32px;padding:0px 15px 0px 0px;float:left'><p style='font-family:\"Roboto\", sans-serif; font-size:20px; color:white;margin: 2px 0px 0px 0px'>Hardware</p></div>
                    <div class="w3-bar-item"><img src='/static/users-icon-64x64.png' alt='Users' style='width:47px;height:32px;padding:0px 15px 0px 0px;float:left'><p style='font-family:\"Roboto\", sans-serif; font-size:20px; color:white;margin: 2px 0px 0px 0px'>Users</p></div>
                    <div class="w3-bar-item"><img src='/static/settings-icon-64x64.png' alt='Settings' style='width:47px;height:32px;padding:0px 15px 0px 0px;float:left'><p style='font-family:\"Roboto\", sans-serif; font-size:20px; color:white;margin: 2px 0px 0px 0px'>Settings</p></div>
                    <div class="w3-bar-item"><img src='/static/logout-icon-64x64.png' alt='Logout' style='width:47px;height:32px;padding:0px 15px 0px 0px;float:left'><p style='font-family:\"Roboto\", sans-serif; font-size:20px; color:white;margin: 2px 0px 0px 0px'>Logout</p></div>
                    <br>
                    <br>
                </div>
                <div style="margin-left:320px; margin-right:70px">
                <div style="w3-container">
                    <br>"""
    return return_str
    
def draw_compiling_page():
    return_str = draw_blank_page()
    return_str += """
                    <h2>Compiling program</h2>
                    <textarea id='mytextarea' style='height:500px; resize:vertical'>
loading logs...
                    </textarea>
                    <br><br><center><a href='dashboard' id='dashboard_button' class='button' style='background-color: #EDEDED; pointer-events: none; width: 310px; height: 53px; margin: 0px 20px 0px 20px;'><b>Go to Dashboard</b></a></center>
                </div>
            </div>
        </div>
    </body>
    
    <script>
        (function (global)
        {
            if(typeof (global) === "undefined")
            {
                throw new Error("window is undefined");
            }
            
            var _hash = "!";
            var noBackPlease = function () 
            {
                global.location.href += "#";

                // making sure we have the fruit available for juice....
                // 50 milliseconds for just once do not cost much (^__^)
                global.setTimeout(function () 
                {
                    global.location.href += "!";
                }, 50);
            };
            
            // Earlier we had setInerval here....
            global.onhashchange = function () 
            {
                if (global.location.hash !== _hash) 
                {
                    global.location.hash = _hash;
                }
            };

            global.onload = function () 
            {
                loadData();
                noBackPlease();
                
                // disables backspace on page except on input fields and textarea..
                document.body.onkeydown = function (e) 
                {
                    var elm = e.target.nodeName.toLowerCase();
                    if (e.which === 8 && (elm !== 'input' && elm  !== 'textarea')) 
                    {
                        e.preventDefault();
                    }
                    // stopping event bubbling up the DOM tree..
                    e.stopPropagation();
                };
            };
        })(window);
        
        var req;
        
        function loadData()
        {
            url = 'compilation-logs'
            try
            {
                req = new XMLHttpRequest();
            } catch (e) 
            {
                try
                {
                    req = new ActiveXObject('Msxml2.XMLHTTP');
                } catch (e) 
                {
                    try 
                    {
                        req = new ActiveXObject('Microsoft.XMLHTTP');
                    } catch (oc) 
                    {
                        alert('No AJAX Support');
                        return;
                    }
                }
            }
            
            req.onreadystatechange = processReqChange;
            req.open('GET', url, true);
            req.send(null);
        }
        
        function processReqChange()
        {
            //If req shows 'complete'
            if (req.readyState == 4)
            {
                compilation_logs = document.getElementById('mytextarea');
                dashboard_button = document.getElementById('dashboard_button');
                
                //If 'OK'
                if (req.status == 200)
                {
                    //Update textarea text
                    compilation_logs.value = req.responseText;
                    if ((req.responseText.search("Compilation finished with errors!") != -1) || (req.responseText.search("Compilation finished successfully!") != -1))
                    {
                        dashboard_button.style.background='#0066FC'
                        dashboard_button.style.pointerEvents='auto'
                    }
                    
                    //Start a new update timer
                    timeoutID = setTimeout('loadData()', 1000);
                }
                else
                {
                    compilation_logs.value = 'There was a problem retrieving the logs. Error: ' + req.statusText;
                }
            }
        }
    </script>
</html>"""
    return return_str

    
@login_manager.user_loader
def user_loader(username):
    database = "openplc.db"
    conn = create_connection(database)
    if (conn != None):
        try:
            cur = conn.cursor()
            cur.execute("SELECT username, password, name, pict_file FROM Users")
            rows = cur.fetchall()
            cur.close()
            conn.close()

            for row in rows:
                if (row[0] == username):
                    user = User()
                    user.id = row[0]
                    user.name = row[2]
                    user.pict_file = str(row[3])
                    return user
            return
                    
        except Error as e:
            print("error connecting to the database" + str(e))
            return
    else:
        return


@login_manager.request_loader
def request_loader(request):
    username = request.form.get('username')
    
    database = "openplc.db"
    conn = create_connection(database)
    if (conn != None):
        try:
            cur = conn.cursor()
            cur.execute("SELECT username, password, name, pict_file FROM Users")
            rows = cur.fetchall()
            cur.close()
            conn.close()

            for row in rows:
                if (row[0] == username):
                    user = User()
                    user.id = row[0]
                    user.name = row[2]
                    user.pict_file = str(row[3])
                    user.is_authenticated = (request.form['password'] == row[1])
                    return user
            return
                    
        except Error as e:
            print("error connecting to the database" + str(e))
            return
    else:
        return


@app.before_request
def before_request():
    flask.session.permanent = True
    app.permanent_session_lifetime = datetime.timedelta(minutes=5)
    flask.session.modified = True
        
@app.route('/')
def index():
    if flask_login.current_user.is_authenticated:
        return flask.redirect(flask.url_for('dashboard'))
    else:
        return flask.redirect(flask.url_for('login'))


@app.route('/login', methods=['GET', 'POST'])
def login():
    if flask.request.method == 'GET':
        return pages.login_head + pages.login_body

    username = flask.request.form['username']
    password = flask.request.form['password']
    
    database = "openplc.db"
    conn = create_connection(database)
    if (conn != None):
        try:
            cur = conn.cursor()
            cur.execute("SELECT username, password, name, pict_file FROM Users")
            rows = cur.fetchall()
            cur.close()
            conn.close()

            for row in rows:
                if (row[0] == username):
                    if (row[1] == password):
                        user = User()
                        user.id = row[0]
                        user.name = row[2]
                        user.pict_file = str(row[3])
                        flask_login.login_user(user)
                        return flask.redirect(flask.url_for('dashboard'))
                    else:
                        return pages.login_head + pages.bad_login_body
                        
            return pages.login_head + pages.bad_login_body
                    
        except Error as e:
            print("error connecting to the database" + str(e))
            return 'Error opening DB'
    else:
        return 'Error opening DB'

    return pages.login_head + pages.bad_login_body


@app.route('/start_plc')
def start_plc():
    global openplc_runtime
    if (flask_login.current_user.is_authenticated == False):
        return flask.redirect(flask.url_for('login'))
    else:
        monitor.stop_monitor()
        openplc_runtime.start_runtime()
        time.sleep(1)
        configure_runtime()
        monitor.cleanup()
        monitor.parse_st(openplc_runtime.project_file)
        return flask.redirect(flask.url_for('dashboard'))


@app.route('/stop_plc')
def stop_plc():
    global openplc_runtime
    if (flask_login.current_user.is_authenticated == False):
        return flask.redirect(flask.url_for('login'))
    else:
        openplc_runtime.stop_runtime()
        time.sleep(1)
        monitor.stop_monitor()
        return flask.redirect(flask.url_for('dashboard'))


@app.route('/runtime_logs')
def runtime_logs():
    global openplc_runtime
    if (flask_login.current_user.is_authenticated == False):
        return flask.redirect(flask.url_for('login'))
    else:
        return openplc_runtime.logs()


@app.route('/dashboard')
def dashboard():
    global openplc_runtime
    if (flask_login.current_user.is_authenticated == False):
        return flask.redirect(flask.url_for('login'))
    else:
        monitor.stop_monitor()
        if (openplc_runtime.status() == "Compiling"): return draw_compiling_page()
        return_str = pages.w3_style + pages.dashboard_head + draw_top_div()
        return_str += """
            <div class='main'>
                <div class='w3-sidebar w3-bar-block' style='width:250px; background-color:#1F1F1F'>
                    <br>
                    <br>
                    <a href='dashboard' class='w3-bar-item w3-button' style='background-color:#0066FC; padding-right:0px;padding-top:0px;padding-bottom:0px'><img src='/static/home-icon-64x64.png' alt='Dashboard' style='width:47px;height:39px;padding:7px 15px 0px 0px;float:left'><img src='/static/arrow.png' style='width:17px;height:49px;padding:0px 0px 0px 0px;margin: 0px 0px 0px 0px; float:right'><p style='font-family:\"Roboto\", sans-serif; font-size:20px; color:white;margin: 10px 0px 0px 0px'>Dashboard</p></a>
                    <a href='programs' class='w3-bar-item w3-button'><img src='/static/programs-icon-64x64.png' alt='Programs' style='width:47px;height:32px;padding:0px 15px 0px 0px;float:left'><p style='font-family:\"Roboto\", sans-serif; font-size:20px; color:white;margin: 2px 0px 0px 0px'>Programs</p></a>
                    <a href='modbus' class='w3-bar-item w3-button'><img src='/static/modbus-icon-512x512.png' alt='Modbus' style='width:47px;height:32px;padding:0px 15px 0px 0px;float:left'><p style='font-family:\"Roboto\", sans-serif; font-size:20px; color:white;margin: 2px 0px 0px 0px'>Slave Devices</p></a>
                    <a href='monitoring' class='w3-bar-item w3-button'><img src='/static/monitoring-icon-64x64.png' alt='Monitoring' style='width:47px;height:32px;padding:0px 15px 0px 0px;float:left'><p style='font-family:\"Roboto\", sans-serif; font-size:20px; color:white;margin: 2px 0px 0px 0px'>Monitoring</p></a>
                    <a href='hardware' class='w3-bar-item w3-button'><img src='/static/hardware-icon-980x974.png' alt='Hardware' style='width:47px;height:32px;padding:0px 15px 0px 0px;float:left'><p style='font-family:\"Roboto\", sans-serif; font-size:20px; color:white;margin: 2px 0px 0px 0px'>Hardware</p></a>
                    <a href='users' class='w3-bar-item w3-button'><img src='/static/users-icon-64x64.png' alt='Users' style='width:47px;height:32px;padding:0px 15px 0px 0px;float:left'><p style='font-family:\"Roboto\", sans-serif; font-size:20px; color:white;margin: 2px 0px 0px 0px'>Users</p></a>
                    <a href='settings' class='w3-bar-item w3-button'><img src='/static/settings-icon-64x64.png' alt='Settings' style='width:47px;height:32px;padding:0px 15px 0px 0px;float:left'><p style='font-family:\"Roboto\", sans-serif; font-size:20px; color:white;margin: 2px 0px 0px 0px'>Settings</p></a>
                    <a href='logout' class='w3-bar-item w3-button'><img src='/static/logout-icon-64x64.png' alt='Logout' style='width:47px;height:32px;padding:0px 15px 0px 0px;float:left'><p style='font-family:\"Roboto\", sans-serif; font-size:20px; color:white;margin: 2px 0px 0px 0px'>Logout</p></a>
                    <br>
                    <br>"""
        return_str += draw_status()
        return_str += """
        </div>
                <div style='margin-left:320px'>
                    <div style='w3-container'>
                        <br>
                        <h2>Dashboard</h2>
                        <p style='font-family:'Roboto', sans-serif; font-size:16px'><b>Status: """
        if (openplc_runtime.status() == "Running"):
            return_str += "<font color = '#02CC07'>Running</font></b></p>"
        else:
            return_str += "<font color = 'Red'>Stopped</font></b></p>"
            
        return_str += "<p style='font-family:'Roboto', sans-serif; font-size:16px'><b>Program:</b> " + openplc_runtime.project_name + "</p>"
        return_str += "<p style='font-family:'Roboto', sans-serif; font-size:16px'><b>Description:</b> " + openplc_runtime.project_description + "</p>"
        return_str += "<p style='font-family:'Roboto', sans-serif; font-size:16px'><b>File:</b> " + openplc_runtime.project_file + "</p>"
        return_str += "<p style='font-family:'Roboto', sans-serif; font-size:16px'><b>Runtime:</b> " + openplc_runtime.exec_time() + "</p>"
        
        return_str += pages.dashboard_tail
        
        return return_str


@app.route('/programs', methods=['GET', 'POST'])
def programs():
    if (flask_login.current_user.is_authenticated == False):
        return flask.redirect(flask.url_for('login'))
    else:
        monitor.stop_monitor()
        if (openplc_runtime.status() == "Compiling"): return draw_compiling_page()
        list_all = False
        if (flask.request.args.get('list_all') == '1'):
            list_all = True
        return_str = pages.w3_style + pages.style + draw_top_div()
        return_str += """
            <div class='main'>
                <div class='w3-sidebar w3-bar-block' style='width:250px; background-color:#1F1F1F'>
                    <br>
                    <br>
                    <a href="dashboard" class="w3-bar-item w3-button"><img src="/static/home-icon-64x64.png" alt="Dashboard" style="width:47px;height:32px;padding:0px 15px 0px 0px;float:left"><p style='font-family:"Roboto", sans-serif; font-size:20px; color:white;margin: 2px 0px 0px 0px'>Dashboard</p></a>
                    <a href="programs" class="w3-bar-item w3-button" style="background-color:#0066FC; padding-right:0px;padding-top:0px;padding-bottom:0px"><img src="/static/programs-icon-64x64.png" alt="Programs" style="width:47px;height:39px;padding:7px 15px 0px 0px;float:left"><img src="/static/arrow.png" style="width:17px;height:49px;padding:0px 0px 0px 0px;margin: 0px 0px 0px 0px; float:right"><p style='font-family:"Roboto", sans-serif; font-size:20px; color:white;margin: 10px 0px 0px 0px'>Programs</p></a>
                    <a href='modbus' class='w3-bar-item w3-button'><img src='/static/modbus-icon-512x512.png' alt='Modbus' style='width:47px;height:32px;padding:0px 15px 0px 0px;float:left'><p style='font-family:\"Roboto\", sans-serif; font-size:20px; color:white;margin: 2px 0px 0px 0px'>Slave Devices</p></a>
                    <a href='monitoring' class='w3-bar-item w3-button'><img src='/static/monitoring-icon-64x64.png' alt='Monitoring' style='width:47px;height:32px;padding:0px 15px 0px 0px;float:left'><p style='font-family:\"Roboto\", sans-serif; font-size:20px; color:white;margin: 2px 0px 0px 0px'>Monitoring</p></a>
                    <a href='hardware' class='w3-bar-item w3-button'><img src='/static/hardware-icon-980x974.png' alt='Hardware' style='width:47px;height:32px;padding:0px 15px 0px 0px;float:left'><p style='font-family:\"Roboto\", sans-serif; font-size:20px; color:white;margin: 2px 0px 0px 0px'>Hardware</p></a>
                    <a href='users' class='w3-bar-item w3-button'><img src='/static/users-icon-64x64.png' alt='Users' style='width:47px;height:32px;padding:0px 15px 0px 0px;float:left'><p style='font-family:\"Roboto\", sans-serif; font-size:20px; color:white;margin: 2px 0px 0px 0px'>Users</p></a>
                    <a href='settings' class='w3-bar-item w3-button'><img src='/static/settings-icon-64x64.png' alt='Settings' style='width:47px;height:32px;padding:0px 15px 0px 0px;float:left'><p style='font-family:\"Roboto\", sans-serif; font-size:20px; color:white;margin: 2px 0px 0px 0px'>Settings</p></a>
                    <a href='logout' class='w3-bar-item w3-button'><img src='/static/logout-icon-64x64.png' alt='Logout' style='width:47px;height:32px;padding:0px 15px 0px 0px;float:left'><p style='font-family:\"Roboto\", sans-serif; font-size:20px; color:white;margin: 2px 0px 0px 0px'>Logout</p></a>
                    <br>
                    <br>"""
        return_str += draw_status()
        return_str += """
        </div>
            <div style="margin-left:320px; margin-right:70px">
                <div style="w3-container">
                    <br>
                    <h2>Programs</h2>
                    <p>Here you can upload a new program to OpenPLC or revert back to a previous uploaded program shown on the table.</p>
                    <table>
                        <tr style='background-color: white'>
                            <th>Program Name</th><th>File</th><th>Date Uploaded</th>
                        </tr>"""
        database = "openplc.db"
        conn = create_connection(database)
        if (conn != None):
            try:
                cur = conn.cursor()
                if (list_all == True):
                    cur.execute("SELECT Prog_ID, Name, File, Date_upload FROM Programs ORDER BY Date_upload DESC")
                else:
                    cur.execute("SELECT Prog_ID, Name, File, Date_upload FROM Programs ORDER BY Date_upload DESC LIMIT 10")
                rows = cur.fetchall()
                cur.close()
                conn.close()
                
                for row in rows:
                    return_str += "<tr onclick=\"document.location='reload-program?table_id=" + str(row[0]) + "'\">"
                    return_str += "<td>" + str(row[1]) + "</td><td>" + str(row[2]) + "</td><td>" + time.strftime('%b %d, %Y - %I:%M%p', time.localtime(row[3])) + "</td></tr>"
                    
                return_str += """
                    </table>
                    <a href="programs?list_all=1" style="text-align:right; float:right; color:black; font-weight:bold;">List all programs</a>
                    <br>
                    <br>
                    <h2>Upload Program</h2>
                    <form   id    = "uploadForm"
                        enctype   =  "multipart/form-data"
                        action    =  "upload-program"
                        method    =  "post">
                        <br>
                        <input type="file" name="file" id="file" class="inputfile" accept=".st">
                        <input type="submit" value="Upload Program" name="submit">
                    </form>
                </div>
            </div>
        </div>
    </body>
</html>"""
            except Error as e:
                print("error connecting to the database" + str(e))
                return_str += 'Error connecting to the database. Make sure that your openplc.db file is not corrupt.<br><br>Error: ' + str(e)
        else:
            return_str += 'Error connecting to the database. Make sure that your openplc.db file is not corrupt.'
        
        return return_str


@app.route('/reload-program', methods=['GET', 'POST'])
def reload_program():
    if (flask_login.current_user.is_authenticated == False):
        return flask.redirect(flask.url_for('login'))
    else:
        if (openplc_runtime.status() == "Compiling"): return draw_compiling_page()
        prog_id = flask.request.args.get('table_id')
        return_str = pages.w3_style + pages.style + draw_top_div()
        return_str += """
            <div class='main'>
                <div class='w3-sidebar w3-bar-block' style='width:250px; background-color:#1F1F1F'>
                    <br>
                    <br>
                    <a href="dashboard" class="w3-bar-item w3-button"><img src="/static/home-icon-64x64.png" alt="Dashboard" style="width:47px;height:32px;padding:0px 15px 0px 0px;float:left"><p style='font-family:"Roboto", sans-serif; font-size:20px; color:white;margin: 2px 0px 0px 0px'>Dashboard</p></a>
                    <a href="programs" class="w3-bar-item w3-button" style="background-color:#0066FC; padding-right:0px;padding-top:0px;padding-bottom:0px"><img src="/static/programs-icon-64x64.png" alt="Programs" style="width:47px;height:39px;padding:7px 15px 0px 0px;float:left"><img src="/static/arrow.png" style="width:17px;height:49px;padding:0px 0px 0px 0px;margin: 0px 0px 0px 0px; float:right"><p style='font-family:"Roboto", sans-serif; font-size:20px; color:white;margin: 10px 0px 0px 0px'>Programs</p></a>
                    <a href='modbus' class='w3-bar-item w3-button'><img src='/static/modbus-icon-512x512.png' alt='Modbus' style='width:47px;height:32px;padding:0px 15px 0px 0px;float:left'><p style='font-family:\"Roboto\", sans-serif; font-size:20px; color:white;margin: 2px 0px 0px 0px'>Slave Devices</p></a>
                    <a href='monitoring' class='w3-bar-item w3-button'><img src='/static/monitoring-icon-64x64.png' alt='Monitoring' style='width:47px;height:32px;padding:0px 15px 0px 0px;float:left'><p style='font-family:\"Roboto\", sans-serif; font-size:20px; color:white;margin: 2px 0px 0px 0px'>Monitoring</p></a>
                    <a href='hardware' class='w3-bar-item w3-button'><img src='/static/hardware-icon-980x974.png' alt='Hardware' style='width:47px;height:32px;padding:0px 15px 0px 0px;float:left'><p style='font-family:\"Roboto\", sans-serif; font-size:20px; color:white;margin: 2px 0px 0px 0px'>Hardware</p></a>
                    <a href='users' class='w3-bar-item w3-button'><img src='/static/users-icon-64x64.png' alt='Users' style='width:47px;height:32px;padding:0px 15px 0px 0px;float:left'><p style='font-family:\"Roboto\", sans-serif; font-size:20px; color:white;margin: 2px 0px 0px 0px'>Users</p></a>
                    <a href='settings' class='w3-bar-item w3-button'><img src='/static/settings-icon-64x64.png' alt='Settings' style='width:47px;height:32px;padding:0px 15px 0px 0px;float:left'><p style='font-family:\"Roboto\", sans-serif; font-size:20px; color:white;margin: 2px 0px 0px 0px'>Settings</p></a>
                    <a href='logout' class='w3-bar-item w3-button'><img src='/static/logout-icon-64x64.png' alt='Logout' style='width:47px;height:32px;padding:0px 15px 0px 0px;float:left'><p style='font-family:\"Roboto\", sans-serif; font-size:20px; color:white;margin: 2px 0px 0px 0px'>Logout</p></a>
                    <br>
                    <br>"""
        return_str += draw_status()
        return_str += """
            </div>
            <div style="margin-left:320px; margin-right:70px">
                <div style="w3-container">
                    <br>
                    <h2>Program Info</h2>
                    <br>"""
        database = "openplc.db"
        conn = create_connection(database)
        if (conn != None):
            try:
                cur = conn.cursor()
                cur.execute("SELECT * FROM Programs WHERE Prog_ID = ?", (int(prog_id),))
                row = cur.fetchone()
                cur.close()
                conn.close()
                return_str += "<label for='prog_name'><b>Name</b></label><input type='text' id='prog_name' name='program_name' value='" + str(row[1]) + "' disabled>"
                return_str += "<label for='prog_descr'><b>Description</b></label><textarea type='text' rows='10' style='resize:vertical' id='prog_descr' name='program_descr' disabled>" + str(row[2]) + "</textarea>"
                return_str += "<label for='prog_file'><b>File</b></label><input type='text' id='prog_file' name='program_file' value='" + str(row[3]) + "' disabled>"
                return_str += "<label for='prog_date'><b>Date Uploaded</b></label><input type='text' id='prog_date' name='program_date' value='" + time.strftime('%b %d, %Y - %I:%M%p', time.localtime(row[4])) + "' disabled>"
                return_str += "<br><br><center><a href='compile-program?file=" + str(row[3]) + "' class='button' style='width: 200px; height: 53px; margin: 0px 20px 0px 20px;'><b>Launch program</b></a><a href='update-program?id=" + str(prog_id) + "' class='button' style='width: 200px; height: 53px; margin: 0px 20px 0px 20px;'><b>Update program</b></a><a href='remove-program?id=" + str(prog_id) + "' class='button' style='width: 200px; height: 53px; margin: 0px 20px 0px 20px;'><b>Remove program</b></a></center>"
                return_str += """
                </div>
            </div>
        </div>
    </body>
</html>"""

            except Error as e:
                print("error connecting to the database" + str(e))
                return_str += 'Error connecting to the database. Make sure that your openplc.db file is not corrupt.<br><br>Error: ' + str(e)
        else:
            return_str += 'Error connecting to the database. Make sure that your openplc.db file is not corrupt.'
        
        return return_str
        
        
@app.route('/update-program', methods=['GET', 'POST'])
def update_program():
    if (flask_login.current_user.is_authenticated == False):
        return flask.redirect(flask.url_for('login'))
    else:
        if (openplc_runtime.status() == "Compiling"): return draw_compiling_page()
        prog_id = flask.request.args.get('id')
        
        return_str = pages.w3_style + pages.style + draw_top_div()
        return_str += """
            <div class='main'>
                <div class='w3-sidebar w3-bar-block' style='width:250px; background-color:#1F1F1F'>
                    <br>
                    <br>
                    <a href="dashboard" class="w3-bar-item w3-button"><img src="/static/home-icon-64x64.png" alt="Dashboard" style="width:47px;height:32px;padding:0px 15px 0px 0px;float:left"><p style='font-family:"Roboto", sans-serif; font-size:20px; color:white;margin: 2px 0px 0px 0px'>Dashboard</p></a>
                    <a href="programs" class="w3-bar-item w3-button" style="background-color:#0066FC; padding-right:0px;padding-top:0px;padding-bottom:0px"><img src="/static/programs-icon-64x64.png" alt="Programs" style="width:47px;height:39px;padding:7px 15px 0px 0px;float:left"><img src="/static/arrow.png" style="width:17px;height:49px;padding:0px 0px 0px 0px;margin: 0px 0px 0px 0px; float:right"><p style='font-family:"Roboto", sans-serif; font-size:20px; color:white;margin: 10px 0px 0px 0px'>Programs</p></a>
                    <a href='modbus' class='w3-bar-item w3-button'><img src='/static/modbus-icon-512x512.png' alt='Modbus' style='width:47px;height:32px;padding:0px 15px 0px 0px;float:left'><p style='font-family:\"Roboto\", sans-serif; font-size:20px; color:white;margin: 2px 0px 0px 0px'>Slave Devices</p></a>
                    <a href='monitoring' class='w3-bar-item w3-button'><img src='/static/monitoring-icon-64x64.png' alt='Monitoring' style='width:47px;height:32px;padding:0px 15px 0px 0px;float:left'><p style='font-family:\"Roboto\", sans-serif; font-size:20px; color:white;margin: 2px 0px 0px 0px'>Monitoring</p></a>
                    <a href='hardware' class='w3-bar-item w3-button'><img src='/static/hardware-icon-980x974.png' alt='Hardware' style='width:47px;height:32px;padding:0px 15px 0px 0px;float:left'><p style='font-family:\"Roboto\", sans-serif; font-size:20px; color:white;margin: 2px 0px 0px 0px'>Hardware</p></a>
                    <a href='users' class='w3-bar-item w3-button'><img src='/static/users-icon-64x64.png' alt='Users' style='width:47px;height:32px;padding:0px 15px 0px 0px;float:left'><p style='font-family:\"Roboto\", sans-serif; font-size:20px; color:white;margin: 2px 0px 0px 0px'>Users</p></a>
                    <a href='settings' class='w3-bar-item w3-button'><img src='/static/settings-icon-64x64.png' alt='Settings' style='width:47px;height:32px;padding:0px 15px 0px 0px;float:left'><p style='font-family:\"Roboto\", sans-serif; font-size:20px; color:white;margin: 2px 0px 0px 0px'>Settings</p></a>
                    <a href='logout' class='w3-bar-item w3-button'><img src='/static/logout-icon-64x64.png' alt='Logout' style='width:47px;height:32px;padding:0px 15px 0px 0px;float:left'><p style='font-family:\"Roboto\", sans-serif; font-size:20px; color:white;margin: 2px 0px 0px 0px'>Logout</p></a>
                    <br>
                    <br>"""
        return_str += draw_status()
        return_str += """
        </div>
            <div style="margin-left:320px; margin-right:70px">
                <div style="w3-container">
                    <br>
                    <h2>Upload Program</h2>
                    <form   id    = "uploadForm"
                        enctype   =  "multipart/form-data"
                        action    =  "update-program-action"
                        method    =  "post">
                        <br>
                        <input type="file" name="file" id="file" class="inputfile" accept=".st">
                        <input type="submit" value="Upload Program" name="submit">
                        <input type='hidden' name='prog_id' id='prog_id' value='""" + prog_id + """'/>
                        <input type='hidden' value='""" + str(int(time.time())) + """' id='epoch_time' name='epoch_time'/>
                    </form>
                </div>
            </div>
        </div>
    </body>
</html>"""
        
        
        return return_str


@app.route('/update-program-action', methods=['GET', 'POST'])
def update_program_action():
    if (flask_login.current_user.is_authenticated == False):
        return flask.redirect(flask.url_for('login'))
    else:
        if (openplc_runtime.status() == "Compiling"): return draw_compiling_page()
        if ('file' not in flask.request.files):
            return draw_blank_page() + "<h2>Error</h2><p>You need to select a file to be uploaded!<br><br>Use the back-arrow on your browser to return</p></div></div></div></body></html>"
        prog_file = flask.request.files['file']
        if (prog_file.filename == ''):
            return draw_blank_page() + "<h2>Error</h2><p>You need to select a file to be uploaded!<br><br>Use the back-arrow on your browser to return</p></div></div></div></body></html>"
        prog_id = flask.request.form['prog_id']
        epoch_time = flask.request.form['epoch_time']
        
        database = "openplc.db"
        conn = create_connection(database)
        if (conn != None):
            try:
                cur = conn.cursor()
                cur.execute("SELECT * FROM Programs WHERE Prog_ID = ?", (int(prog_id),))
                row = cur.fetchone()
                cur.close()
                
                filename = str(row[3])
                prog_file.save(os.path.join('st_files', filename))
                
                #Redirect back to the compiling page
                return '<!DOCTYPE html><html><head><meta http-equiv="refresh" content="0; url=/compile-program?file=' + filename + '"></head></html>'
                
            except Error as e:
                print("error connecting to the database" + str(e))
                return 'Error connecting to the database. Make sure that your openplc.db file is not corrupt.<br><br>Error: ' + str(e)
        else:
            return 'Error connecting to the database. Make sure that your openplc.db file is not corrupt.'


@app.route('/remove-program', methods=['GET', 'POST'])
def remove_program():
    if (flask_login.current_user.is_authenticated == False):
        return flask.redirect(flask.url_for('login'))
    else:
        if (openplc_runtime.status() == "Compiling"): return draw_compiling_page()
        prog_id = flask.request.args.get('id')
        database = "openplc.db"
        conn = create_connection(database)
        if (conn != None):
            try:
                cur = conn.cursor()
                cur.execute("DELETE FROM Programs WHERE Prog_ID = ?", (int(prog_id),))
                conn.commit()
                cur.close()
                conn.close()
                return flask.redirect(flask.url_for('programs'))
                
            except Error as e:
                print("error connecting to the database" + str(e))
                return 'Error connecting to the database. Make sure that your openplc.db file is not corrupt.<br><br>Error: ' + str(e)
        else:
            return 'Error connecting to the database. Make sure that your openplc.db file is not corrupt.'


@app.route('/upload-program', methods=['GET', 'POST'])
def upload_program():
    if (flask_login.current_user.is_authenticated == False):
        return flask.redirect(flask.url_for('login'))
    else:
        if (openplc_runtime.status() == "Compiling"): return draw_compiling_page()
        if ('file' not in flask.request.files):
            return draw_blank_page() + "<h2>Error</h2><p>You need to select a file to be uploaded!<br><br>Use the back-arrow on your browser to return</p></div></div></div></body></html>"
        prog_file = flask.request.files['file']
        if (prog_file.filename == ''):
            return draw_blank_page() + "<h2>Error</h2><p>You need to select a file to be uploaded!<br><br>Use the back-arrow on your browser to return</p></div></div></div></body></html>"
        
        filename = str(random.randint(1,1000000)) + ".st"
        prog_file.save(os.path.join('st_files', filename))
        
        return_str = pages.w3_style + pages.style + draw_top_div()
        return_str += """
            <div class='main'>
                <div class='w3-sidebar w3-bar-block' style='width:250px; background-color:#1F1F1F'>
                    <br>
                    <br>
                    <a href="dashboard" class="w3-bar-item w3-button"><img src="/static/home-icon-64x64.png" alt="Dashboard" style="width:47px;height:32px;padding:0px 15px 0px 0px;float:left"><p style='font-family:"Roboto", sans-serif; font-size:20px; color:white;margin: 2px 0px 0px 0px'>Dashboard</p></a>
                    <a href="programs" class="w3-bar-item w3-button" style="background-color:#0066FC; padding-right:0px;padding-top:0px;padding-bottom:0px"><img src="/static/programs-icon-64x64.png" alt="Programs" style="width:47px;height:39px;padding:7px 15px 0px 0px;float:left"><img src="/static/arrow.png" style="width:17px;height:49px;padding:0px 0px 0px 0px;margin: 0px 0px 0px 0px; float:right"><p style='font-family:"Roboto", sans-serif; font-size:20px; color:white;margin: 10px 0px 0px 0px'>Programs</p></a>
                    <a href='modbus' class='w3-bar-item w3-button'><img src='/static/modbus-icon-512x512.png' alt='Modbus' style='width:47px;height:32px;padding:0px 15px 0px 0px;float:left'><p style='font-family:\"Roboto\", sans-serif; font-size:20px; color:white;margin: 2px 0px 0px 0px'>Slave Devices</p></a>
                    <a href='monitoring' class='w3-bar-item w3-button'><img src='/static/monitoring-icon-64x64.png' alt='Monitoring' style='width:47px;height:32px;padding:0px 15px 0px 0px;float:left'><p style='font-family:\"Roboto\", sans-serif; font-size:20px; color:white;margin: 2px 0px 0px 0px'>Monitoring</p></a>
                    <a href='hardware' class='w3-bar-item w3-button'><img src='/static/hardware-icon-980x974.png' alt='Hardware' style='width:47px;height:32px;padding:0px 15px 0px 0px;float:left'><p style='font-family:\"Roboto\", sans-serif; font-size:20px; color:white;margin: 2px 0px 0px 0px'>Hardware</p></a>
                    <a href='users' class='w3-bar-item w3-button'><img src='/static/users-icon-64x64.png' alt='Users' style='width:47px;height:32px;padding:0px 15px 0px 0px;float:left'><p style='font-family:\"Roboto\", sans-serif; font-size:20px; color:white;margin: 2px 0px 0px 0px'>Users</p></a>
                    <a href='settings' class='w3-bar-item w3-button'><img src='/static/settings-icon-64x64.png' alt='Settings' style='width:47px;height:32px;padding:0px 15px 0px 0px;float:left'><p style='font-family:\"Roboto\", sans-serif; font-size:20px; color:white;margin: 2px 0px 0px 0px'>Settings</p></a>
                    <a href='logout' class='w3-bar-item w3-button'><img src='/static/logout-icon-64x64.png' alt='Logout' style='width:47px;height:32px;padding:0px 15px 0px 0px;float:left'><p style='font-family:\"Roboto\", sans-serif; font-size:20px; color:white;margin: 2px 0px 0px 0px'>Logout</p></a>
                    <br>
                    <br>"""
        return_str += draw_status()
        return_str += """
        </div>
            <div style="margin-left:320px; margin-right:70px">
                <div style="w3-container">
                    <br>
                    <h2>Program Info</h2>
                    <br>
                    <form id      = "uploadForm"
                        enctype   = "multipart/form-data"
                        action    = "upload-program-action"
                        method    = "post"
                        onsubmit  = "return validateForm()">
                        
                        <label for='prog_name'><b>Name</b></label>
                        <input type='text' id='prog_name' name='prog_name' placeholder='My Program v1.0'>
                        <label for='prog_descr'><b>Description</b></label>
                        <textarea type='text' rows='10' style='resize:vertical' id='prog_descr' name='prog_descr' placeholder='Insert the program description here'></textarea>"""
        return_str += "<label for='prog_file'><b>File</b></label><input type='text' id='program_file' name='program_file' value='" + filename + "' disabled>"
        return_str += "<label for='prog_date'><b>Date Uploaded</b></label><input type='text' id='prog_date' name='prog_date' value='" + time.strftime('%b %d, %Y - %I:%M%p', time.localtime(int(time.time()))) + "' disabled>"
        return_str += "<input type='hidden' value='" + filename + "' id='prog_file' name='prog_file'/>"
        return_str += "<input type='hidden' value='" + str(int(time.time())) + "' id='epoch_time' name='epoch_time'/>"
        return_str += """
                        <br>
                        <br>
                        <center><input type="submit" class="button" style="font-weight:bold; width: 310px; height: 53px; margin: 0px 20px 0px 20px;" value="Upload program"></center>
                    </form>
                </div>
            </div>
        </div>
    </body>
    
    <script type="text/javascript">
        function validateForm()
        {
            var progname = document.forms["uploadForm"]["prog_name"].value;
            if (progname == "")
            {
                alert("Program Name cannot be blank");
                return false;
            }
            return true;
        }
    </script>
</html>"""

        return return_str


@app.route('/upload-program-action', methods=['GET', 'POST'])
def upload_program_action():
    if (flask_login.current_user.is_authenticated == False):
        return flask.redirect(flask.url_for('login'))
    else:
        if (openplc_runtime.status() == "Compiling"): return draw_compiling_page()
        prog_name = flask.request.form['prog_name']
        prog_descr = flask.request.form['prog_descr']
        prog_file = flask.request.form['prog_file']
        epoch_time = flask.request.form['epoch_time']

               #validate epoch_time format and range
        try:
            epoch_time = int(epoch_time)
            current_time = int(time.time())
            #allow timestamps between 2015-01-01 and 1 year in the future
            min_allowed_time = 1420070400  #2015-01-01 00:00:00
            max_allowed_time = current_time + (100 * 31536000)  #current time + 1 year
            
            if epoch_time < min_allowed_time or epoch_time > max_allowed_time:
                return 'Invalid epoch time value: must be between 2015-01-01 and 1 year from now'
        except ValueError:
            return 'Invalid epoch time format: must be a valid integer timestamp'

        (prog_name, prog_descr, prog_file, epoch_time) = sanitize_input(prog_name, prog_descr, prog_file, int(epoch_time))
        
        database = "openplc.db"
        conn = create_connection(database)
        if (conn != None):
            try:
                cur = conn.cursor()
                cur.execute("INSERT INTO Programs (Name, Description, File, Date_upload) VALUES (?, ?, ?, ?)", (prog_name, prog_descr, prog_file, epoch_time))
                conn.commit()
                cur.close()
                conn.close()
                #Redirect back to the compiling page
                return '<!DOCTYPE html><html><head><meta http-equiv="refresh" content="0; url=/compile-program?file=' + prog_file + '"></head></html>'
            
            except Error as e:
                print("error connecting to the database" + str(e))
                return 'Error connecting to the database. Make sure that your openplc.db file is not corrupt.<br><br>Error: ' + str(e)
        else:
            return 'Error connecting to the database. Make sure that your openplc.db file is not corrupt.'
        

@app.route('/compile-program', methods=['GET', 'POST'])
def compile_program():
    global openplc_runtime
    if (flask_login.current_user.is_authenticated == False):
        return flask.redirect(flask.url_for('login'))
    else:
        if (openplc_runtime.status() == "Compiling"): return draw_compiling_page()
        st_file = flask.request.args.get('file')
        
        #load information about the program being compiled into the openplc_runtime object
        database = "openplc.db"
        conn = create_connection(database)
        if (conn != None):
            try:
                cur = conn.cursor()
                cur.execute("SELECT * FROM Programs WHERE File=?", (st_file,))
                row = cur.fetchone()
                openplc_runtime.project_name = str(row[1])
                openplc_runtime.project_description = str(row[2])
                openplc_runtime.project_file = str(row[3])
                cur.close()
                conn.close()
            except Error as e:
                print("error connecting to the database" + str(e))
        else:
            print("error connecting to the database")
        
        delete_persistent_file()
        openplc_runtime.compile_program(st_file)
        
        return draw_compiling_page()


@app.route('/compilation-logs', methods=['GET', 'POST'])
def compilation_logs():
    if (flask_login.current_user.is_authenticated == False):
        return flask.redirect(flask.url_for('login'))
    else:
        return openplc_runtime.compilation_status()


@app.route('/modbus', methods=['GET', 'POST'])
def modbus():
    if (flask_login.current_user.is_authenticated == False):
        return flask.redirect(flask.url_for('login'))
    else:
        monitor.stop_monitor()
        if (openplc_runtime.status() == "Compiling"): return draw_compiling_page()
        return_str = pages.w3_style + pages.style + draw_top_div()
        return_str += """
            <div class='main'>
                <div class='w3-sidebar w3-bar-block' style='width:250px; background-color:#1F1F1F'>
                    <br>
                    <br>
                    <a href="dashboard" class="w3-bar-item w3-button"><img src="/static/home-icon-64x64.png" alt="Dashboard" style="width:47px;height:32px;padding:0px 15px 0px 0px;float:left"><p style='font-family:"Roboto", sans-serif; font-size:20px; color:white;margin: 2px 0px 0px 0px'>Dashboard</p></a>
                    <a href="programs" class="w3-bar-item w3-button"><img src="/static/programs-icon-64x64.png" alt="Programs" style="width:47px;height:32px;padding:0px 15px 0px 0px;float:left"><p style='font-family:"Roboto", sans-serif; font-size:20px; color:white;margin: 2px 0px 0px 0px'>Programs</p></a>
                    <a href="modbus" class="w3-bar-item w3-button" style="background-color:#0066FC; padding-right:0px;padding-top:0px;padding-bottom:0px"><img src="/static/modbus-icon-512x512.png" alt="Modbus" style="width:47px;height:39px;padding:7px 15px 0px 0px;float:left"><img src="/static/arrow.png" style="width:17px;height:49px;padding:0px 0px 0px 0px;margin: 0px 0px 0px 0px; float:right"><p style='font-family:"Roboto", sans-serif; font-size:20px; color:white;margin: 10px 0px 0px 0px'>Slave Devices</p></a>
                    <a href='monitoring' class='w3-bar-item w3-button'><img src='/static/monitoring-icon-64x64.png' alt='Monitoring' style='width:47px;height:32px;padding:0px 15px 0px 0px;float:left'><p style='font-family:\"Roboto\", sans-serif; font-size:20px; color:white;margin: 2px 0px 0px 0px'>Monitoring</p></a>
                    <a href='hardware' class='w3-bar-item w3-button'><img src='/static/hardware-icon-980x974.png' alt='Hardware' style='width:47px;height:32px;padding:0px 15px 0px 0px;float:left'><p style='font-family:\"Roboto\", sans-serif; font-size:20px; color:white;margin: 2px 0px 0px 0px'>Hardware</p></a>
                    <a href='users' class='w3-bar-item w3-button'><img src='/static/users-icon-64x64.png' alt='Users' style='width:47px;height:32px;padding:0px 15px 0px 0px;float:left'><p style='font-family:\"Roboto\", sans-serif; font-size:20px; color:white;margin: 2px 0px 0px 0px'>Users</p></a>
                    <a href='settings' class='w3-bar-item w3-button'><img src='/static/settings-icon-64x64.png' alt='Settings' style='width:47px;height:32px;padding:0px 15px 0px 0px;float:left'><p style='font-family:\"Roboto\", sans-serif; font-size:20px; color:white;margin: 2px 0px 0px 0px'>Settings</p></a>
                    <a href='logout' class='w3-bar-item w3-button'><img src='/static/logout-icon-64x64.png' alt='Logout' style='width:47px;height:32px;padding:0px 15px 0px 0px;float:left'><p style='font-family:\"Roboto\", sans-serif; font-size:20px; color:white;margin: 2px 0px 0px 0px'>Logout</p></a>
                    <br>
                    <br>"""
        return_str += draw_status()
        return_str += """
        </div>
            <div style="margin-left:320px; margin-right:70px">
                <div style="w3-container">
                    <br>
                    <h2>Slave Devices</h2>
                    <p>List of Slave devices attached to OpenPLC.</p>
                    <p><b>Attention:</b> Slave devices are attached to address 100 onward (i.e. %IX100.0, %IW100, %QX100.0, and %QW100)
                    <table>
                        <tr style='background-color: white'>
                            <th>Device Name</th><th>Device Type</th><th>DI</th><th>DO</th><th>AI</th><th>AO</th>
                        </tr>"""
        database = "openplc.db"
        conn = create_connection(database)
        if (conn != None):
            try:
                cur = conn.cursor()
                cur.execute("SELECT dev_id, dev_name, dev_type, di_size, coil_size, ir_size, hr_read_size, hr_write_size FROM Slave_dev")
                rows = cur.fetchall()
                cur.close()
                conn.close()
                
                counter_di = 0
                counter_do = 0
                counter_ai = 0
                counter_ao = 0
                
                for row in rows:
                    return_str += "<tr onclick=\"document.location='modbus-edit-device?table_id=" + str(row[0]) + "'\">"
                    
                    #calculate di
                    if (row[3] == 0):
                        di = "-"
                    else:
                        di = "%IX" + str(100 + (counter_di // 8)) + "." + str(counter_di%8) + " to "
                        counter_di += row[3];
                        di += "%IX" + str(100 + ((counter_di-1) // 8)) + "." + str((counter_di-1)%8)
                        
                    #calculate do
                    if (row[4] == 0):
                        do = "-"
                    else:
                        do = "%QX" + str(100 + (counter_do // 8)) + "." + str(counter_do%8) + " to "
                        counter_do += row[4];
                        do += "%QX" + str(100 + ((counter_do-1) // 8)) + "." + str((counter_do-1)%8)
                        
                    #calculate ai
                    if (row[5] + row[6] == 0):
                        ai = "-"
                    else:
                        ai = "%IW" + str(100 + counter_ai) + " to "
                        counter_ai += row[5]+row[6];
                        ai += "%IW" + str(100 + (counter_ai-1))
                        
                    #calculate ao
                    if (row[7] == 0):
                        ao = "-"
                    else:
                        ao = "%QW" + str(100 + counter_ao) + " to "
                        counter_ao += row[7];
                        ao += "%QW" + str(100 + (counter_ao-1))
                    
                    
                    return_str += "<td>" + str(row[1]) + "</td><td>" + str(row[2]) + "</td><td>" + di + "</td><td>" + do + "</td><td>" + ai + "</td><td>" + ao + "</td></tr>"
                    
                return_str += """
                    </table>
                    <br>
                    <center><a href="add-modbus-device" class="button" style="width: 310px; height: 53px; margin: 0px 20px 0px 20px;"><b>Add new device</b></a></center>
                </div>
            </div>
        </div>
    </body>
</html>"""

            except Error as e:
                print("error connecting to the database" + str(e))
                return_str += 'Error connecting to the database. Make sure that your openplc.db file is not corrupt.<br><br>Error: ' + str(e)
        else:
            return_str += 'Error connecting to the database. Make sure that your openplc.db file is not corrupt.'
        
        return return_str
        

@app.route('/add-modbus-device', methods=['GET', 'POST'])
def add_modbus_device():
    if (flask_login.current_user.is_authenticated == False):
        return flask.redirect(flask.url_for('login'))
    else:
        if (openplc_runtime.status() == "Compiling"): return draw_compiling_page()
        if (flask.request.method == 'GET'):
            return_str = pages.w3_style + pages.style + draw_top_div()
            return_str += """
                <div class='main'>
                    <div class='w3-sidebar w3-bar-block' style='width:250px; background-color:#1F1F1F'>
                        <br>
                        <br>
                        <a href="dashboard" class="w3-bar-item w3-button"><img src="/static/home-icon-64x64.png" alt="Dashboard" style="width:47px;height:32px;padding:0px 15px 0px 0px;float:left"><p style='font-family:"Roboto", sans-serif; font-size:20px; color:white;margin: 2px 0px 0px 0px'>Dashboard</p></a>
                        <a href="programs" class="w3-bar-item w3-button"><img src="/static/programs-icon-64x64.png" alt="Programs" style="width:47px;height:32px;padding:0px 15px 0px 0px;float:left"><p style='font-family:"Roboto", sans-serif; font-size:20px; color:white;margin: 2px 0px 0px 0px'>Programs</p></a>
                        <a href="modbus" class="w3-bar-item w3-button" style="background-color:#0066FC; padding-right:0px;padding-top:0px;padding-bottom:0px"><img src="/static/modbus-icon-512x512.png" alt="Modbus" style="width:47px;height:39px;padding:7px 15px 0px 0px;float:left"><img src="/static/arrow.png" style="width:17px;height:49px;padding:0px 0px 0px 0px;margin: 0px 0px 0px 0px; float:right"><p style='font-family:"Roboto", sans-serif; font-size:20px; color:white;margin: 10px 0px 0px 0px'>Slave Devices</p></a>
                        <a href='monitoring' class='w3-bar-item w3-button'><img src='/static/monitoring-icon-64x64.png' alt='Monitoring' style='width:47px;height:32px;padding:0px 15px 0px 0px;float:left'><p style='font-family:\"Roboto\", sans-serif; font-size:20px; color:white;margin: 2px 0px 0px 0px'>Monitoring</p></a>
                        <a href='hardware' class='w3-bar-item w3-button'><img src='/static/hardware-icon-980x974.png' alt='Hardware' style='width:47px;height:32px;padding:0px 15px 0px 0px;float:left'><p style='font-family:\"Roboto\", sans-serif; font-size:20px; color:white;margin: 2px 0px 0px 0px'>Hardware</p></a>
                        <a href='users' class='w3-bar-item w3-button'><img src='/static/users-icon-64x64.png' alt='Users' style='width:47px;height:32px;padding:0px 15px 0px 0px;float:left'><p style='font-family:\"Roboto\", sans-serif; font-size:20px; color:white;margin: 2px 0px 0px 0px'>Users</p></a>
                        <a href='settings' class='w3-bar-item w3-button'><img src='/static/settings-icon-64x64.png' alt='Settings' style='width:47px;height:32px;padding:0px 15px 0px 0px;float:left'><p style='font-family:\"Roboto\", sans-serif; font-size:20px; color:white;margin: 2px 0px 0px 0px'>Settings</p></a>
                        <a href='logout' class='w3-bar-item w3-button'><img src='/static/logout-icon-64x64.png' alt='Logout' style='width:47px;height:32px;padding:0px 15px 0px 0px;float:left'><p style='font-family:\"Roboto\", sans-serif; font-size:20px; color:white;margin: 2px 0px 0px 0px'>Logout</p></a>
                        <br>
                        <br>"""
            return_str += draw_status()
            return_str += """
                </div>
                <div style="margin-left:320px; margin-right:70px">
                    <div style="w3-container">
                        <br>
                        <h2>Add new device</h2>
                        <br>
                        <div style="float:left; width:45%; height:780px">
                        <form   id    = "uploadForm"
                            enctype   =  "multipart/form-data"
                            action    =  "add-modbus-device"
                            method    =  "post"
                            onsubmit  =  "return validateForm()">
                            <label for='dev_name'><b>Device Name</b></label>
                            <input type='text' id='dev_name' name='device_name' placeholder='My Device'>
                            <label for='dev_protocol'><b>Device Type</b></label>
                            <select id='dev_protocol' name='device_protocol'>
                                <option selected='selected' value='Uno'>Arduino Uno</option>
                                <option value='Mega'>Arduino Mega</option>
                                <option value='ESP32'>ESP32</option>
                                <option value='ESP8266'>ESP8266</option>
                                <option value='TCP'>Generic Modbus TCP Device</option>
                                <option value='RTU'>Generic Modbus RTU Device</option>
                            </select>
                            <label for='dev_id'><b>Slave ID</b></label>
                            <input type='text' id='dev_id' name='device_id' placeholder='0'>
                            <div id="tcp-stuff" style="display: none">
                            <label for='dev_ip'><b>IP Address</b></label>
                            <input type='text' id='dev_ip' name='device_ip' placeholder='192.168.0.1'>
                            <label for='dev_port'><b>IP Port</b></label>
                            <input type='text' id='dev_port' name='device_port' placeholder='502'>
                            </div>
                            <div id="rtu-stuff">
                            <label for='dev_cport'><b>COM Port</b></label>
                            <select id='dev_cport' name='device_cport'>"""
                            
            ports = [comport.device for comport in serial.tools.list_ports.comports()]
            for port in ports:
                if (platform.system().startswith("CYGWIN")) or (platform.system().startswith("MSYS_NT")):
                    port_name = "COM" + str(int(port.split("/dev/ttyS")[1]) + 1)
                else:
                    port_name = port
                return_str += "<option value='" + port_name + "'>" + port_name + "</option>"
            
            return_str += pages.add_slave_devices_tail + pages.add_devices_script
            
            return return_str
            
        elif (flask.request.method == 'POST'):
            devname = flask.request.form.get('device_name')
            devtype = flask.request.form.get('device_protocol')
            devid = flask.request.form.get('device_id')
            devip = flask.request.form.get('device_ip')
            devport = flask.request.form.get('device_port')
            devcport = flask.request.form.get('device_cport')
            devbaud = flask.request.form.get('device_baud')
            devparity = flask.request.form.get('device_parity')
            devdata = flask.request.form.get('device_data')
            devstop = flask.request.form.get('device_stop')
            devpause = flask.request.form.get('device_pause')
            
            di_start = flask.request.form.get('di_start')
            di_size = flask.request.form.get('di_size')
            do_start = flask.request.form.get('do_start')
            do_size = flask.request.form.get('do_size')
            ai_start = flask.request.form.get('ai_start')
            ai_size = flask.request.form.get('ai_size')
            aor_start = flask.request.form.get('aor_start')
            aor_size = flask.request.form.get('aor_size')
            aow_start = flask.request.form.get('aow_start')
            aow_size = flask.request.form.get('aow_size')
            
            (devname, devtype, devid, devcport, devbaud, devparity, devdata, devstop, devpause, devip, devport, di_start, di_size, do_start, do_size, ai_start, ai_size, aor_start, aor_size, aow_start, aow_size) \
                = sanitize_input(devname, devtype, devid, devcport, devbaud, devparity, devdata, devstop, devpause, devip, devport, di_start, di_size, do_start, do_size, ai_start, ai_size, aor_start, aor_size, aow_start, aow_size)

            database = "openplc.db"
            conn = create_connection(database)
            if (conn != None):
                try:
                    cur = conn.cursor()
                    cur.execute("INSERT INTO Slave_dev (dev_name, dev_type, slave_id, com_port, baud_rate, parity, data_bits, stop_bits, ip_address, ip_port, di_start, di_size, coil_start, coil_size, ir_start, ir_size, hr_read_start, hr_read_size, hr_write_start, hr_write_size, pause) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)", (devname, devtype, devid, devcport, devbaud, devparity, devdata, devstop, devip, devport, di_start, di_size, do_start, do_size, ai_start, ai_size, aor_start, aor_size, aow_start, aow_size, devpause))
                    conn.commit()
                    cur.close()
                    conn.close()
                    
                    generate_mbconfig()
                    return flask.redirect(flask.url_for('modbus'))
                    
                except Error as e:
                    print("error connecting to the database" + str(e))
                    return 'Error connecting to the database. Make sure that your openplc.db file is not corrupt.<br><br>Error: ' + str(e)
            else:
                return 'Error connecting to the database. Make sure that your openplc.db file is not corrupt.'


@app.route('/modbus-edit-device', methods=['GET', 'POST'])
def modbus_edit_device():
    if (flask_login.current_user.is_authenticated == False):
        return flask.redirect(flask.url_for('login'))
    else:
        if (openplc_runtime.status() == "Compiling"): return draw_compiling_page()
        if (flask.request.method == 'GET'):
            dev_id = flask.request.args.get('table_id')
            return_str = pages.w3_style + pages.style + draw_top_div()
            return_str += """
                <div class='main'>
                    <div class='w3-sidebar w3-bar-block' style='width:250px; background-color:#1F1F1F'>
                        <br>
                        <br>
                        <a href="dashboard" class="w3-bar-item w3-button"><img src="/static/home-icon-64x64.png" alt="Dashboard" style="width:47px;height:32px;padding:0px 15px 0px 0px;float:left"><p style='font-family:"Roboto", sans-serif; font-size:20px; color:white;margin: 2px 0px 0px 0px'>Dashboard</p></a>
                        <a href="programs" class="w3-bar-item w3-button"><img src="/static/programs-icon-64x64.png" alt="Programs" style="width:47px;height:32px;padding:0px 15px 0px 0px;float:left"><p style='font-family:"Roboto", sans-serif; font-size:20px; color:white;margin: 2px 0px 0px 0px'>Programs</p></a>
                        <a href="modbus" class="w3-bar-item w3-button" style="background-color:#0066FC; padding-right:0px;padding-top:0px;padding-bottom:0px"><img src="/static/modbus-icon-512x512.png" alt="Modbus" style="width:47px;height:39px;padding:7px 15px 0px 0px;float:left"><img src="/static/arrow.png" style="width:17px;height:49px;padding:0px 0px 0px 0px;margin: 0px 0px 0px 0px; float:right"><p style='font-family:"Roboto", sans-serif; font-size:20px; color:white;margin: 10px 0px 0px 0px'>Slave Devices</p></a>
                        <a href='monitoring' class='w3-bar-item w3-button'><img src='/static/monitoring-icon-64x64.png' alt='Monitoring' style='width:47px;height:32px;padding:0px 15px 0px 0px;float:left'><p style='font-family:\"Roboto\", sans-serif; font-size:20px; color:white;margin: 2px 0px 0px 0px'>Monitoring</p></a>
                        <a href='hardware' class='w3-bar-item w3-button'><img src='/static/hardware-icon-980x974.png' alt='Hardware' style='width:47px;height:32px;padding:0px 15px 0px 0px;float:left'><p style='font-family:\"Roboto\", sans-serif; font-size:20px; color:white;margin: 2px 0px 0px 0px'>Hardware</p></a>
                        <a href='users' class='w3-bar-item w3-button'><img src='/static/users-icon-64x64.png' alt='Users' style='width:47px;height:32px;padding:0px 15px 0px 0px;float:left'><p style='font-family:\"Roboto\", sans-serif; font-size:20px; color:white;margin: 2px 0px 0px 0px'>Users</p></a>
                        <a href='settings' class='w3-bar-item w3-button'><img src='/static/settings-icon-64x64.png' alt='Settings' style='width:47px;height:32px;padding:0px 15px 0px 0px;float:left'><p style='font-family:\"Roboto\", sans-serif; font-size:20px; color:white;margin: 2px 0px 0px 0px'>Settings</p></a>
                        <a href='logout' class='w3-bar-item w3-button'><img src='/static/logout-icon-64x64.png' alt='Logout' style='width:47px;height:32px;padding:0px 15px 0px 0px;float:left'><p style='font-family:\"Roboto\", sans-serif; font-size:20px; color:white;margin: 2px 0px 0px 0px'>Logout</p></a>
                        <br>
                        <br>"""
            return_str += draw_status()
            return_str += """
                </div>
                <div style="margin-left:320px; margin-right:70px">
                    <div style="w3-container">
                        <br>
                        <h2>Edit slave device</h2>
                        <br>
                        <div style="float:left; width:45%; height:780px">
                        <form   id    = "uploadForm"
                            enctype   =  "multipart/form-data"
                            action    =  "modbus-edit-device"
                            method    =  "post"
                            onsubmit  =  "return validateForm()">"""
                            
            database = "openplc.db"
            conn = create_connection(database)
            if (conn != None):
                try:
                    cur = conn.cursor()
                    cur.execute("SELECT * FROM Slave_dev WHERE dev_id = ?", (int(dev_id),))
                    row = cur.fetchone()
                    cur.close()
                    conn.close()
                    return_str += "<input type='hidden' value='" + dev_id + "' id='db_dev_id' name='db_dev_id'/>"
                    return_str += "<label for='dev_name'><b>Device Name</b></label><input type='text' id='dev_name' name='device_name' placeholder='My Device' value='" + str(row[1]) + "'>"
                    return_str += "<label for='dev_protocol'><b>Device Type</b></label><select id='dev_protocol' name='device_protocol'>"
                    if (str(row[2]) == "Uno"):
                        return_str += "<option selected='selected' value='Uno'>Arduino Uno</option>"
                    else:
                        return_str += "<option value='Uno'>Arduino Uno</option>"
                    if (str(row[2]) == "Mega"):
                        return_str += "<option selected='selected' value='Mega'>Arduino Mega</option>"
                    else:
                        return_str += "<option value='Mega'>Arduino Mega</option>"
                    if (str(row[2]) == "ESP32"):
                        return_str += "<option selected='selected' value='ESP32'>ESP32</option>"
                    else:
                        return_str += "<option value='ESP32'>ESP32</option>"
                    if (str(row[2]) == "ESP8266"):
                        return_str += "<option selected='selected' value='ESP8266'>ESP8266</option>"
                    else:
                        return_str += "<option value='ESP8266'>ESP8266</option>"
                    if (str(row[2]) == "TCP"):
                        return_str += "<option selected='selected' value='TCP'>Generic Modbus TCP Device</option>"
                    else:
                        return_str += "<option value='TCP'>Generic Modbus TCP Device</option>"
                    if (str(row[2]) == "RTU"):
                        return_str += "<option selected='selected' value='RTU'>Generic Modbus RTU Device</option></select>"
                    else:
                        return_str += "<option value='RTU'>Generic Modbus RTU Device</option></select>"
                    return_str += "<label for='dev_id'><b>Slave ID</b></label><input type='text' id='dev_id' name='device_id' placeholder='0' value='" + str(row[3]) + "'>"
                    return_str += "<div id=\"tcp-stuff\" style=\"display: none\"><label for='dev_ip'><b>IP Address</b></label><input type='text' id='dev_ip' name='device_ip' placeholder='192.168.0.1' value='" + str(row[9]) + "'>"
                    return_str += "<label for='dev_port'><b>IP Port</b></label><input type='text' id='dev_port' name='device_port' placeholder='502' value='" + str(row[10]) + "'></div>"
                    return_str += "<div id=\"rtu-stuff\"><label for='dev_cport'><b>COM Port</b></label><select id='dev_cport' name='device_cport'>"
                    ports = [comport.device for comport in serial.tools.list_ports.comports()]
                    for port in ports:
                        if (platform.system().startswith("CYGWIN")) or (platform.system().startswith("MSYS_NT")):
                            port_name = "COM" + str(int(port.split("/dev/ttyS")[1]) + 1)
                        else:
                            port_name = port
                        if (str(row[4]) == port_name):
                            return_str += "<option selected='selected' value'" + port_name + "'>" + port_name + "</option>"
                        else:   
                            return_str += "<option value='" + port_name + "'>" + port_name + "</option>"
                    
                    return_str += pages.edit_slave_devices_tail
                    return_str += dev_id
                    return_str += """' class="button" style="width: 310px; height: 53px; margin: 0px 20px 0px 20px;"><b>Delete device</b></a></center>
                    </form>
                </div>
            </div>
        </div>
    </body>"""
                    return_str += pages.edit_devices_script
                    return_str += 'devid.value = "' + str(row[3]) + '";'
                    return_str += 'devcport.value = "' + str(row[4]) + '";'
                    return_str += 'devbaud.value = "' + str(row[5]) + '";'
                    return_str += 'devparity.value = "' + str(row[6]) + '";'
                    return_str += 'devdata.value = "' + str(row[7]) + '";'
                    return_str += 'devstop.value = "' + str(row[8]) + '";'
                    return_str += 'devip.value = "' + str(row[9]) + '";'
                    return_str += 'devport.value = "' + str(row[10]) + '";'
                    return_str += 'distart.value = "' + str(row[11]) + '";'
                    return_str += 'disize.value = "' + str(row[12]) + '";'
                    return_str += 'dostart.value = "' + str(row[13]) + '";'
                    return_str += 'dosize.value = "' + str(row[14]) + '";'
                    return_str += 'aistart.value = "' + str(row[15]) + '";'
                    return_str += 'aisize.value = "' + str(row[16]) + '";'
                    return_str += 'aorstart.value = "' + str(row[17]) + '";'
                    return_str += 'aorsize.value = "' + str(row[18]) + '";'
                    return_str += 'aowstart.value = "' + str(row[19]) + '";'
                    return_str += 'aowsize.value = "' + str(row[20]) + '";'
                    return_str += 'devpause.value = "' + str(row[21]) + '";}</script></html>'
                    
                except Error as e:
                    print("error connecting to the database" + str(e))
                    return_str += 'Error connecting to the database. Make sure that your openplc.db file is not corrupt.<br><br>Error: ' + str(e)
            else:
                return_str += 'Error connecting to the database. Make sure that your openplc.db file is not corrupt.'
            
            return return_str
            
        elif (flask.request.method == 'POST'):
            devid_db = flask.request.form.get('db_dev_id')
            devname = flask.request.form.get('device_name')
            devtype = flask.request.form.get('device_protocol')
            devid = flask.request.form.get('device_id')
            devip = flask.request.form.get('device_ip')
            devport = flask.request.form.get('device_port')
            devcport = flask.request.form.get('device_cport')
            devbaud = flask.request.form.get('device_baud')
            devparity = flask.request.form.get('device_parity')
            devdata = flask.request.form.get('device_data')
            devstop = flask.request.form.get('device_stop')
            devpause = flask.request.form.get('device_pause')
            
            di_start = flask.request.form.get('di_start')
            di_size = flask.request.form.get('di_size')
            do_start = flask.request.form.get('do_start')
            do_size = flask.request.form.get('do_size')
            ai_start = flask.request.form.get('ai_start')
            ai_size = flask.request.form.get('ai_size')
            aor_start = flask.request.form.get('aor_start')
            aor_size = flask.request.form.get('aor_size')
            aow_start = flask.request.form.get('aow_start')
            aow_size = flask.request.form.get('aow_size')
            
            (devname, devtype, devid, devcport, devbaud, devparity, devdata, devstop, devpause, devip, devport, di_start, di_size, do_start, do_size, ai_start, ai_size, aor_start, aor_size, aow_start, aow_size, devid_db) \
                = sanitize_input(devname, devtype, devid, devcport, devbaud, devparity, devdata, devstop, devpause, devip, devport, di_start, di_size, do_start, do_size, ai_start, ai_size, aor_start, aor_size, aow_start, aow_size, devid_db)

            database = "openplc.db"
            conn = create_connection(database)
            if (conn != None):
                try:
                    cur = conn.cursor()
                    cur.execute("UPDATE Slave_dev SET dev_name = ?, dev_type = ?, slave_id = ?, com_port = ?, baud_rate = ?, parity = ?, data_bits = ?, stop_bits = ?, ip_address = ?, ip_port = ?, di_start = ?, di_size = ?, coil_start = ?, coil_size = ?, ir_start = ?, ir_size = ?, hr_read_start = ?, hr_read_size = ?, hr_write_start = ?, hr_write_size = ?, pause = ? WHERE dev_id = ?", (devname, devtype, devid, devcport, devbaud, devparity, devdata, devstop, devip, devport, di_start, di_size, do_start, do_size, ai_start, ai_size, aor_start, aor_size, aow_start, aow_size, devpause, int(devid_db)))
                    conn.commit()
                    cur.close()
                    conn.close()
                    
                    generate_mbconfig()
                    return flask.redirect(flask.url_for('modbus'))
                    
                except Error as e:
                    print("error connecting to the database" + str(e))
                    return 'Error connecting to the database. Make sure that your openplc.db file is not corrupt.<br><br>Error: ' + str(e)
            else:
                return 'Error connecting to the database. Make sure that your openplc.db file is not corrupt.'


@app.route('/delete-device', methods=['GET', 'POST'])
def delete_device():
    if (flask_login.current_user.is_authenticated == False):
        return flask.redirect(flask.url_for('login'))
    else:
        if (openplc_runtime.status() == "Compiling"): return draw_compiling_page()
        devid_db = flask.request.args.get('dev_id')
        database = "openplc.db"
        conn = create_connection(database)
        if (conn != None):
            try:
                cur = conn.cursor()
                cur.execute("DELETE FROM Slave_dev WHERE dev_id = ?", (int(devid_db),))
                conn.commit()
                cur.close()
                conn.close()
                generate_mbconfig()
                return flask.redirect(flask.url_for('modbus'))
            except Error as e:
                print("error connecting to the database" + str(e))
                return 'Error connecting to the database. Make sure that your openplc.db file is not corrupt.<br><br>Error: ' + str(e)
        else:
            return 'Error connecting to the database. Make sure that your openplc.db file is not corrupt.'

            
@app.route('/monitoring', methods=['GET', 'POST'])
def monitoring():
    if (flask_login.current_user.is_authenticated == False):
        return flask.redirect(flask.url_for('login'))
    else:
        if (openplc_runtime.status() == "Compiling"): return draw_compiling_page()
        return_str = pages.w3_style + pages.monitoring_head + draw_top_div()
        return_str += """
            <div class='main'>
                <div class='w3-sidebar w3-bar-block' style='width:250px; background-color:#1F1F1F'>
                    <br>
                    <br>
                    <a href="dashboard" class="w3-bar-item w3-button"><img src="/static/home-icon-64x64.png" alt="Dashboard" style="width:47px;height:32px;padding:0px 15px 0px 0px;float:left"><p style='font-family:"Roboto", sans-serif; font-size:20px; color:white;margin: 2px 0px 0px 0px'>Dashboard</p></a>
                    <a href='programs' class='w3-bar-item w3-button'><img src='/static/programs-icon-64x64.png' alt='Programs' style='width:47px;height:32px;padding:0px 15px 0px 0px;float:left'><p style='font-family:\"Roboto\", sans-serif; font-size:20px; color:white;margin: 2px 0px 0px 0px'>Programs</p></a>
                    <a href='modbus' class='w3-bar-item w3-button'><img src='/static/modbus-icon-512x512.png' alt='Modbus' style='width:47px;height:32px;padding:0px 15px 0px 0px;float:left'><p style='font-family:\"Roboto\", sans-serif; font-size:20px; color:white;margin: 2px 0px 0px 0px'>Slave Devices</p></a>
                    <a href="monitoring" class="w3-bar-item w3-button" style="background-color:#0066FC; padding-right:0px;padding-top:0px;padding-bottom:0px"><img src="/static/monitoring-icon-64x64.png" alt="Monitoring" style="width:47px;height:39px;padding:7px 15px 0px 0px;float:left"><img src="/static/arrow.png" style="width:17px;height:49px;padding:0px 0px 0px 0px;margin: 0px 0px 0px 0px; float:right"><p style='font-family:"Roboto", sans-serif; font-size:20px; color:white;margin: 10px 0px 0px 0px'>Monitoring</p></a>                    
                    <a href='hardware' class='w3-bar-item w3-button'><img src='/static/hardware-icon-980x974.png' alt='Hardware' style='width:47px;height:32px;padding:0px 15px 0px 0px;float:left'><p style='font-family:\"Roboto\", sans-serif; font-size:20px; color:white;margin: 2px 0px 0px 0px'>Hardware</p></a>
                    <a href='users' class='w3-bar-item w3-button'><img src='/static/users-icon-64x64.png' alt='Users' style='width:47px;height:32px;padding:0px 15px 0px 0px;float:left'><p style='font-family:\"Roboto\", sans-serif; font-size:20px; color:white;margin: 2px 0px 0px 0px'>Users</p></a>
                    <a href='settings' class='w3-bar-item w3-button'><img src='/static/settings-icon-64x64.png' alt='Settings' style='width:47px;height:32px;padding:0px 15px 0px 0px;float:left'><p style='font-family:\"Roboto\", sans-serif; font-size:20px; color:white;margin: 2px 0px 0px 0px'>Settings</p></a>
                    <a href='logout' class='w3-bar-item w3-button'><img src='/static/logout-icon-64x64.png' alt='Logout' style='width:47px;height:32px;padding:0px 15px 0px 0px;float:left'><p style='font-family:\"Roboto\", sans-serif; font-size:20px; color:white;margin: 2px 0px 0px 0px'>Logout</p></a>
                    <br>
                    <br>"""
        return_str += draw_status()
        return_str += """
        </div>
            <div style="margin-left:320px; margin-right:70px">
                <div style="w3-container">
                    <br>
                    <h2>Monitoring</h2>
                    <form class="form-inline">
                        <label for="refresh_rate">Refresh Rate (ms):</label>
                        <input type="text" id="refresh_rate" value="500" name="refresh_rate">
                        <button type="button" onclick="updateRefreshRate()">Update</button>
                    </form>
                    <br>
                    <div id='monitor_table'>
                        <table>
                            <col width="50"><col width="10"><col width="10"><col width="10"><col width="100">
                            <tr style='background-color: white'>
                                <th>Point Name</th><th>Type</th><th>Location</th><th>Write</th><th>Value</th>
                            </tr>"""
        
        if (openplc_runtime.status() == "Running"):
            #Check Modbus Server status
            modbus_enabled = False
            modbus_port_cfg = 502
            database = "openplc.db"
            conn = create_connection(database)
            if (conn != None):
                try:
                    print("Openning database")
                    cur = conn.cursor()
                    cur.execute("SELECT * FROM Settings")
                    rows = cur.fetchall()
                    cur.close()
                    conn.close()

                    for row in rows:
                        if (row[0] == "Modbus_port"):
                            if (row[1] != "disabled"):
                                modbus_enabled = True
                                modbus_port_cfg = int(row[1])
                            else:
                                modbus_enabled = False
            
                except Error as e:
                    return "error connecting to the database" + str(e)
            else:
                return "Error opening DB"
            
            if modbus_enabled == True:
                monitor.start_monitor(modbus_port_cfg)
                data_index = 0
                for debug_data in monitor.debug_vars:
                    return_str += '<tr style="height:60px">' # onclick="document.location=\'point-info?table_id=' + str(data_index) + '\'">'
                    return_str += '<td>' + debug_data.name + '</td><td>' + debug_data.type + '</td><td>' + debug_data.location + '</td><td>'
                    if (debug_data.location.find('QX') != -1):
                        return_str += '<button class="write-button true" onclick="fetch(\'/point-write?value=1&address=' + str(debug_data.location) + '\')">true</button>'
                        return_str += '<button class="write-button false" onclick="fetch(\'/point-write?value=0&address=' + str(debug_data.location) + '\')">false</button>'
                    return_str += '</td><td valign="middle">'
                    if (debug_data.type == 'BOOL'):
                        if (debug_data.value == 0):
                            return_str += '<img src="/static/bool_false.png" alt="bool_false" style="width:40px;height:40px;vertical-align:middle; margin-right:10px">FALSE</td>'
                        else:
                            return_str += '<img src="/static/bool_true.png" alt="bool_true" style="width:40px;height:40px;vertical-align:middle; margin-right:10px">TRUE</td>'
                    elif (debug_data.type == 'UINT'):
                        percentage = (debug_data.value*100)/65535
                        return_str += '<div class="w3-grey w3-round" style="height:40px"><div class="w3-container w3-blue w3-round" style="height:40px;width:' + str(int(percentage)) + '%"><p style="margin-top:10px">' + str(debug_data.value) + '</p></div></div></td>'
                    elif (debug_data.type == 'INT'):
                        percentage = ((debug_data.value + 32768)*100)/65535
                        debug_data.value = ctypes.c_short(debug_data.value).value
                        return_str += '<div class="w3-grey w3-round" style="height:40px"><div class="w3-container w3-blue w3-round" style="height:40px;width:' + str(int(percentage)) + '%"><p style="margin-top:10px">' + str(debug_data.value) + '</p></div></div></td>'
                    elif (debug_data.type == 'REAL') or (debug_data.type == 'LREAL'):
                        return_str += "{:10.4f}".format(debug_data.value)
                    else:
                        return_str += str(debug_data.value)
                    return_str += '</tr>'
                    data_index += 1
                return_str += """
                        </table>
                    </div>
                    <input type='hidden' id='modbus_port_cfg' name='modbus_port_cfg' value='""" + str(modbus_port_cfg) + "'>"
                return_str += pages.monitoring_tail
            
            #Modbus Server is not enabled
            else:
                return_str += """
                        </table>
                        <br>
                        <br>
                        <h2>You must enable Modbus Server on Settings to be able to monitor your program!</h2>
                    </div>
                </div>
            </div>
        </div>
    </body>
</html>"""
            
        #Runtime is not running        
        else:
            return_str += """
                        </table>
                    </div>
                </div>
            </div>
        </div>
    </body>
</html>"""

        return return_str
        
@app.route('/monitor-update', methods=['GET', 'POST'])
def monitor_update():
    if (flask_login.current_user.is_authenticated == False):
        return flask.redirect(flask.url_for('login'))
    else:
        #if (openplc_runtime.status() == "Compiling"): return 'OpenPLC is compiling new code. Please wait'
        return_str = """
                        <table>
                            <col width="50"><col width="10"><col width="10"><col width="10"><col width="100">
                            <tr style='background-color: white'>
                                <th>Point Name</th><th>Type</th><th>Location</th><th>Write</th><th>Value</th>
                            </tr>"""
        
        #if (openplc_runtime.status() == "Running"):
        if (True):
            mb_port_cfg = flask.request.args.get('mb_port')
            monitor.start_monitor(int(mb_port_cfg))
            data_index = 0
            for debug_data in monitor.debug_vars:
                return_str += '<tr style="height:60px">' # onclick="document.location=\'point-info?table_id=' + str(data_index) + '\'">'
                return_str += '<td>' + debug_data.name + '</td><td>' + debug_data.type + '</td><td>' + debug_data.location + '</td><td>'
                if (debug_data.location.find('QX') != -1):
                    return_str += '<button class="write-button true" onclick="fetch(\'/point-write?value=1&address=' + str(debug_data.location) + '\')">true</button>'
                    return_str += '<button class="write-button false" onclick="fetch(\'/point-write?value=0&address=' + str(debug_data.location) + '\')">false</button>'
                return_str += '</td><td valign="middle">'
                if (debug_data.type == 'BOOL'):
                    if (debug_data.value == 0):
                        return_str += '<img src="/static/bool_false.png" alt="bool_false" style="width:40px;height:40px;vertical-align:middle; margin-right:10px">FALSE</td>'
                    else:
                        return_str += '<img src="/static/bool_true.png" alt="bool_true" style="width:40px;height:40px;vertical-align:middle; margin-right:10px">TRUE</td>'
                elif (debug_data.type == 'UINT'):
                    percentage = (debug_data.value*100)/65535
                    return_str += '<div class="w3-grey w3-round" style="height:40px"><div class="w3-container w3-blue w3-round" style="height:40px;width:' + str(int(percentage)) + '%"><p style="margin-top:10px">' + str(debug_data.value) + '</p></div></div></td>'
                elif (debug_data.type == 'INT'):
                    percentage = ((debug_data.value + 32768)*100)/65535
                    debug_data.value = ctypes.c_short(debug_data.value).value
                    return_str += '<div class="w3-grey w3-round" style="height:40px"><div class="w3-container w3-blue w3-round" style="height:40px;width:' + str(int(percentage)) + '%"><p style="margin-top:10px">' + str(debug_data.value) + '</p></div></div></td>'
                elif (debug_data.type == 'REAL') or (debug_data.type == 'LREAL'):
                    return_str += "{:10.4f}".format(debug_data.value)
                else:
                    return_str += str(debug_data.value)
                return_str += '</tr>'
                data_index += 1
        
        return_str += """ 
                        </table>"""
        
        return return_str

@app.route('/point-write', methods=['GET', 'POST'])
def point_write():
    if (flask_login.current_user.is_authenticated == False):
        return flask.redirect(flask.url_for('login'))
    else:
        point_value = flask.request.args.get('value')
        point_address = flask.request.args.get('address')
        monitor.write_value(point_address, int(point_value))
        return ''

@app.route('/point-info', methods=['GET', 'POST'])
def point_info():
    if (flask_login.current_user.is_authenticated == False):
        return flask.redirect(flask.url_for('login'))
    else:
        #if (openplc_runtime.status() == "Compiling"): return draw_compiling_page()
        point_id = flask.request.args.get('table_id')
        debug_data = monitor.debug_vars[int(point_id)]
        return_str = pages.w3_style + pages.settings_style + draw_top_div()
        return_str += """
            <div class='main'>
                <div class='w3-sidebar w3-bar-block' style='width:250px; background-color:#1F1F1F'>
                    <br>
                    <br>
                    <a href="dashboard" class="w3-bar-item w3-button"><img src="/static/home-icon-64x64.png" alt="Dashboard" style="width:47px;height:32px;padding:0px 15px 0px 0px;float:left"><p style='font-family:"Roboto", sans-serif; font-size:20px; color:white;margin: 2px 0px 0px 0px'>Dashboard</p></a>
                    <a href='programs' class='w3-bar-item w3-button'><img src='/static/programs-icon-64x64.png' alt='Programs' style='width:47px;height:32px;padding:0px 15px 0px 0px;float:left'><p style='font-family:\"Roboto\", sans-serif; font-size:20px; color:white;margin: 2px 0px 0px 0px'>Programs</p></a>
                    <a href='modbus' class='w3-bar-item w3-button'><img src='/static/modbus-icon-512x512.png' alt='Modbus' style='width:47px;height:32px;padding:0px 15px 0px 0px;float:left'><p style='font-family:\"Roboto\", sans-serif; font-size:20px; color:white;margin: 2px 0px 0px 0px'>Slave Devices</p></a>
                    <a href="monitoring" class="w3-bar-item w3-button" style="background-color:#0066FC; padding-right:0px;padding-top:0px;padding-bottom:0px"><img src="/static/monitoring-icon-64x64.png" alt="Monitoring" style="width:47px;height:39px;padding:7px 15px 0px 0px;float:left"><img src="/static/arrow.png" style="width:17px;height:49px;padding:0px 0px 0px 0px;margin: 0px 0px 0px 0px; float:right"><p style='font-family:"Roboto", sans-serif; font-size:20px; color:white;margin: 10px 0px 0px 0px'>Monitoring</p></a>                    
                    <a href='hardware' class='w3-bar-item w3-button'><img src='/static/hardware-icon-980x974.png' alt='Hardware' style='width:47px;height:32px;padding:0px 15px 0px 0px;float:left'><p style='font-family:\"Roboto\", sans-serif; font-size:20px; color:white;margin: 2px 0px 0px 0px'>Hardware</p></a>
                    <a href='users' class='w3-bar-item w3-button'><img src='/static/users-icon-64x64.png' alt='Users' style='width:47px;height:32px;padding:0px 15px 0px 0px;float:left'><p style='font-family:\"Roboto\", sans-serif; font-size:20px; color:white;margin: 2px 0px 0px 0px'>Users</p></a>
                    <a href='settings' class='w3-bar-item w3-button'><img src='/static/settings-icon-64x64.png' alt='Settings' style='width:47px;height:32px;padding:0px 15px 0px 0px;float:left'><p style='font-family:\"Roboto\", sans-serif; font-size:20px; color:white;margin: 2px 0px 0px 0px'>Settings</p></a>
                    <a href='logout' class='w3-bar-item w3-button'><img src='/static/logout-icon-64x64.png' alt='Logout' style='width:47px;height:32px;padding:0px 15px 0px 0px;float:left'><p style='font-family:\"Roboto\", sans-serif; font-size:20px; color:white;margin: 2px 0px 0px 0px'>Logout</p></a>
                    <br>
                    <br>"""
        return_str += draw_status()
        return_str += """
        </div>
            <div style="margin-left:320px; margin-right:70px">
                <div style="w3-container">
                    <br>
                    <h2>Point Details</h2>
                    <br>
                    <div id='monitor_point'>
                        <input type='hidden' value='""" + point_id + """' id='point_id' name='point_id'/>
                        <p style='font-family:"Roboto", sans-serif; font-size:16px'><b>Point Name:</b> """ + debug_data.name + """</p>
                        <p style='font-family:"Roboto", sans-serif; font-size:16px'><b>Type:</b> """ + debug_data.type + """</p>
                        <p style='font-family:"Roboto", sans-serif; font-size:16px'><b>Location:</b> """ + debug_data.location + "</p>"
        if (debug_data.type == 'BOOL'):
            if (debug_data.value == 0):
                return_str += """<p style='font-family:"Roboto", sans-serif; font-size:16px'><b>Status:</b> <img src="/static/bool_false.png" alt="bool_false" style="width:40px;height:40px;vertical-align:middle; margin-right:10px">FALSE</p>"""
            else:
                return_str += """<p style='font-family:"Roboto", sans-serif; font-size:16px'><b>Status:</b> <img src="/static/bool_true.png" alt="bool_true" style="width:40px;height:40px;vertical-align:middle; margin-right:10px">TRUE</p>"""
        elif (debug_data.type == 'UINT'):
            percentage = (debug_data.value*100)/65535
            return_str += """<p style='font-family:"Roboto", sans-serif; font-size:16px'><b>Value: </b> <div class="w3-grey w3-round" style="height:40px"><div class="w3-container w3-blue w3-round" style="height:40px;width:""" + str(int(percentage)) + '%"><p style="margin-top:10px">' + str(debug_data.value) + '</p></div></div></p>'
        elif (debug_data.type == 'INT'):
            percentage = ((debug_data.value + 32768)*100)/65535
            debug_data.value = ctypes.c_short(debug_data.value).value
            return_str += """<p style='font-family:"Roboto", sans-serif; font-size:16px'><b>Value: </b> <div class="w3-grey w3-round" style="height:40px"><div class="w3-container w3-blue w3-round" style="height:40px;width:""" + str(int(percentage)) + '%"><p style="margin-top:10px">' + str(debug_data.value) + '</p></div></div></p>'
        elif (debug_data.type == 'REAL') or (debug_data.type == 'LREAL'):
            return_str += """<p style='font-family:"Roboto", sans-serif; font-size:16px'><b>Value: </b>""" + "{:10.4f}".format(debug_data.value) + "</p>"
        else:
            return_str += """<p style='font-family:"Roboto", sans-serif; font-size:16px'><b>Value: </b>""" + str(debug_data.value) + "</p>"
        
        return_str += """<br>
                        <br>
                    </div>
                    <form action="/monitoring" method="post">
                        <label class="container">
                            <b>Force Point Value: </b>
                            <input id="force_checkbox" type="checkbox">
                            <span class="checkmark"></span>
                        </label>"""
        if (debug_data.type == 'BOOL'):
            return_str += """
                        <select id='forced_value' name='forced_value' style="width:200px;height:30px;font-size: 16px;font-family: 'Roboto', sans-serif;">
                            <option selected='selected' value='TRUE'>TRUE</option>
                            <option value='FALSE'>FALSE</option>
                        </select>"""
        else:
            return_str += """
                        <input type='text' id='forced_value' name='forced_value' style="width:200px;height:30px;font-size: 16px;font-family: 'Roboto', sans-serif;" value='0'>
                        """
        return_str += pages.point_info_tail
        return return_str


@app.route('/point-update', methods=['GET', 'POST'])
def point_update():
    if (flask_login.current_user.is_authenticated == False):
        return flask.redirect(flask.url_for('login'))
    else:
        #if (openplc_runtime.status() == "Compiling"): return draw_compiling_page()
        point_id = flask.request.args.get('table_id')
        debug_data = monitor.debug_vars[int(point_id)]
        return_str = """
                        <input type='hidden' value='""" + point_id + """' id='point_id' name='point_id'/>
                        <p style='font-family:"Roboto", sans-serif; font-size:16px'><b>Point Name:</b> """ + debug_data.name + """</p>
                        <p style='font-family:"Roboto", sans-serif; font-size:16px'><b>Type:</b> """ + debug_data.type + """</p>
                        <p style='font-family:"Roboto", sans-serif; font-size:16px'><b>Location:</b> """ + debug_data.location + "</p>"
        if (debug_data.type == 'BOOL'):
            if (debug_data.value == 0):
                return_str += """<p style='font-family:"Roboto", sans-serif; font-size:16px'><b>Status:</b> <img src="/static/bool_false.png" alt="bool_false" style="width:40px;height:40px;vertical-align:middle; margin-right:10px">FALSE</p>"""
            else:
                return_str += """<p style='font-family:"Roboto", sans-serif; font-size:16px'><b>Status:</b> <img src="/static/bool_true.png" alt="bool_true" style="width:40px;height:40px;vertical-align:middle; margin-right:10px">TRUE</p>"""
        elif (debug_data.type == 'UINT'):
            percentage = (debug_data.value*100)/65535
            return_str += """<p style='font-family:"Roboto", sans-serif; font-size:16px'><b>Value: </b> <div class="w3-grey w3-round" style="height:40px"><div class="w3-container w3-blue w3-round" style="height:40px;width:""" + str(int(percentage)) + '%"><p style="margin-top:10px">' + str(debug_data.value) + '</p></div></div></p>'
        elif (debug_data.type == 'INT'):
            percentage = ((debug_data.value + 32768)*100)/65535
            debug_data.value = ctypes.c_short(debug_data.value).value
            return_str += """<p style='font-family:"Roboto", sans-serif; font-size:16px'><b>Value: </b> <div class="w3-grey w3-round" style="height:40px"><div class="w3-container w3-blue w3-round" style="height:40px;width:""" + str(int(percentage)) + '%"><p style="margin-top:10px">' + str(debug_data.value) + '</p></div></div></p>'
        elif (debug_data.type == 'REAL') or (debug_data.type == 'LREAL'):
            return_str += """<p style='font-family:"Roboto", sans-serif; font-size:16px'><b>Value: </b>""" + "{:10.4f}".format(debug_data.value) + "</p>"
        else:
            return_str += """<p style='font-family:"Roboto", sans-serif; font-size:16px'><b>Value: </b>""" + str(debug_data.value) + "</p>"
        
        return_str += """<br>
                        <br>"""
        return return_str




@app.route('/hardware', methods=['GET', 'POST'])
def hardware():
    if (flask_login.current_user.is_authenticated == False):
        return flask.redirect(flask.url_for('login'))
    else:
        monitor.stop_monitor()
        if (openplc_runtime.status() == "Compiling"): return draw_compiling_page()
        if (flask.request.method == 'GET'):
            with open('./scripts/openplc_driver') as f: current_driver = f.read().rstrip()
            return_str = pages.w3_style + pages.hardware_style + draw_top_div() + pages.hardware_head
            return_str += draw_status()
            return_str += """
            </div>
            <div style="margin-left:320px; margin-right:70px">
                <div style="w3-container">
                    <br>
                    <h2>Hardware</h2>
                    <p>OpenPLC controls inputs and outputs through a piece of code called hardware layer (also known as driver). Therefore, to properly handle the inputs and outputs of your board, you must select the appropriate hardware layer for it. The Blank hardware layer is the default option on OpenPLC, which provides no support for native inputs and outputs.</p>
                    <!-- <p>This section allows you to change the hardware layer used by OpenPLC. It is also possible to augment the current hardware layer through the hardware layer code box. -->
                    <p><b>OpenPLC Hardware Layer</b><p>
                    <form   id    = "uploadForm"
                        enctype   =  "multipart/form-data"
                        action    =  "hardware"
                        method    =  "post">
                        <select id='hardware_layer' name='hardware_layer' style="width:400px;height:30px;font-size: 16px;font-family: 'Roboto', sans-serif;" onchange='refreshSelector()'>"""
            if (current_driver == "blank"): return_str += "<option selected='selected' value='blank'>Blank</option>"
            else: return_str += "<option value='blank'>Blank</option>"
            if (current_driver == "blank_linux"): return_str += "<option selected='selected' value='blank_linux'>Blank Linux</option>"
            else: return_str += "<option value='blank_linux'>Blank with DNP3 (Linux only)</option>"
            if (current_driver == "fischertechnik"): return_str += "<option selected='selected' value='fischertechnik'>Fischertechnik</option>"
            else: return_str += "<option value='fischertechnik'>Fischertechnik</option>"
            if (current_driver == "neuron"): return_str += "<option selected='selected' value='neuron'>Neuron</option>"
            else: return_str += "<option value='neuron'>Neuron</option>"
            if (current_driver == "pixtend"): return_str += "<option selected='selected' value='pixtend'>PiXtend</option>"
            else: return_str += "<option value='pixtend'>PiXtend</option>"
            if (current_driver == "pixtend_2s"): return_str += "<option selected='selected' value='pixtend_2s'>PiXtend 2s</option>"
            else: return_str += "<option value='pixtend_2s'>PiXtend 2s</option>"
            if (current_driver == "pixtend_2l"): return_str += "<option selected='selected' value='pixtend_2l'>PiXtend 2l</option>"
            else: return_str += "<option value='pixtend_2l'>PiXtend 2l</option>"  
            if (current_driver == "rpi"): return_str += "<option selected='selected' value='rpi'>Raspberry Pi</option>"
            else: return_str += "<option value='rpi'>Raspberry Pi</option>"
            if (current_driver == "rpi_old"): return_str += "<option selected='selected' value='rpi_old'>Raspberry Pi - Old Model (2011 model B)</option>"
            else: return_str += "<option value='rpi_old'>Raspberry Pi - Old Model (2011 model B)</option>"
            if (current_driver == "opi_zero2"): return_str += "<option selected='selected' value='opi_zero2'>Orange Pi Zero2/Zero2 LTS/Zero2 B</option>"
            else: return_str += "<option value='opi_zero2'>Orange Pi Zero2/Zero2 LTS/Zero2 B</option>"
            if (current_driver == "simulink"): return_str += "<option selected='selected' value='simulink'>Simulink</option>"
            else: return_str += "<option value='simulink'>Simulink</option>"
            if (current_driver == "simulink_linux"): return_str += "<option selected='selected' value='simulink_linux'>Simulink with DNP3 (Linux only)</option>"
            else: return_str += "<option value='simulink_linux'>Simulink with DNP3 (Linux only)</option>"
            if (current_driver == "unipi"): return_str += "<option selected='selected' value='unipi'>UniPi v1.1</option>"
            else: return_str += "<option value='unipi'>UniPi v1.1</option>"
            if (current_driver == "psm_linux"): return_str += "<option selected='selected' value='psm_linux'>Python on Linux (PSM)</option>"
            else: return_str += "<option value='psm_linux'>Python on Linux (PSM)</option>"
            if (current_driver == "psm_win"): return_str += "<option selected='selected' value='psm_win'>Python on Windows (PSM)</option>"
            else: return_str += "<option value='psm_win'>Python on Windows (PSM)</option>"
            if (current_driver == "sequent"): return_str += "<option selected='selected' value='sequent'>Sequent HAT</option>"
            else: return_str += "<option value='sequent'>Sequent HAT's</option>"
            if (current_driver == "sl_rp4"): return_str += "<option selected='selected' value='sl_rp4'>SL-RP4</option>"
            else: return_str += "<option value='sl_rp4'>SL-RP4</option>"
            if (current_driver == "piplc"): return_str += "<option selected='selected' value='piplc'>Binary-6 PiPLC</option>"
            else: return_str += "<option value='piplc'>Binary-6 PiPLC</option>"
            return_str += """
                        </select>
                        <br>
                        <br>
                        <div id="psm_code" style="visibility:hidden">
                            <p><b>OpenPLC Python SubModule (PSM)</b><p>
                            <p>PSM is a powerful bridge that connects OpenPLC core to Python. You can use PSM to write your own OpenPLC driver in pure Python. See below for a sample driver that switches %IX0.0 every second</p>
                            <textarea wrap="off" spellcheck="false" name="custom_layer_code" id="custom_layer_code">"""
            with open('./core/psm/main.py') as f: return_str += f.read()
            return_str += pages.hardware_tail
            
        else:
            hardware_layer = flask.request.form['hardware_layer']
            custom_layer_code = flask.request.form['custom_layer_code']
            with open('./active_program') as f: current_program = f.read()
            with open('./core/psm/main.py', 'w+') as f: f.write(custom_layer_code)
            
            subprocess.call(['./scripts/change_hardware_layer.sh', hardware_layer])
            return "<head><meta http-equiv=\"refresh\" content=\"0; URL='compile-program?file=" + current_program + "'\" /></head>"
        
        return return_str


@app.route('/restore_custom_hardware')
def restore_custom_hardware():
    if (flask_login.current_user.is_authenticated == False):
        return flask.redirect(flask.url_for('login'))
    else:
        if (openplc_runtime.status() == "Compiling"): return draw_compiling_page()
        
        #Restore the original custom layer code
        with open('./core/psm/main.original') as f: original_code = f.read()
        with open('./core/psm/main.py', 'w+') as f: f.write(original_code)
        return flask.redirect(flask.url_for('hardware'))
        

@app.route('/users')
def users():
    if (flask_login.current_user.is_authenticated == False):
        return flask.redirect(flask.url_for('login'))
    else:
        monitor.stop_monitor()
        if (openplc_runtime.status() == "Compiling"): return draw_compiling_page()
        return_str = pages.w3_style + pages.style + draw_top_div()
        return_str += """
            <div class='main'>
                <div class='w3-sidebar w3-bar-block' style='width:250px; background-color:#1F1F1F'>
                    <br>
                    <br>
                    <a href="dashboard" class="w3-bar-item w3-button"><img src="/static/home-icon-64x64.png" alt="Dashboard" style="width:47px;height:32px;padding:0px 15px 0px 0px;float:left"><p style='font-family:"Roboto", sans-serif; font-size:20px; color:white;margin: 2px 0px 0px 0px'>Dashboard</p></a>
                    <a href='programs' class='w3-bar-item w3-button'><img src='/static/programs-icon-64x64.png' alt='Programs' style='width:47px;height:32px;padding:0px 15px 0px 0px;float:left'><p style='font-family:\"Roboto\", sans-serif; font-size:20px; color:white;margin: 2px 0px 0px 0px'>Programs</p></a>
                    <a href='modbus' class='w3-bar-item w3-button'><img src='/static/modbus-icon-512x512.png' alt='Modbus' style='width:47px;height:32px;padding:0px 15px 0px 0px;float:left'><p style='font-family:\"Roboto\", sans-serif; font-size:20px; color:white;margin: 2px 0px 0px 0px'>Slave Devices</p></a>
                    <a href='monitoring' class='w3-bar-item w3-button'><img src='/static/monitoring-icon-64x64.png' alt='Monitoring' style='width:47px;height:32px;padding:0px 15px 0px 0px;float:left'><p style='font-family:\"Roboto\", sans-serif; font-size:20px; color:white;margin: 2px 0px 0px 0px'>Monitoring</p></a>
                    <a href='hardware' class='w3-bar-item w3-button'><img src='/static/hardware-icon-980x974.png' alt='Hardware' style='width:47px;height:32px;padding:0px 15px 0px 0px;float:left'><p style='font-family:\"Roboto\", sans-serif; font-size:20px; color:white;margin: 2px 0px 0px 0px'>Hardware</p></a>
                    <a href="users" class="w3-bar-item w3-button" style="background-color:#0066FC; padding-right:0px;padding-top:0px;padding-bottom:0px"><img src="/static/users-icon-64x64.png" alt="Users" style="width:47px;height:39px;padding:7px 15px 0px 0px;float:left"><img src="/static/arrow.png" style="width:17px;height:49px;padding:0px 0px 0px 0px;margin: 0px 0px 0px 0px; float:right"><p style='font-family:"Roboto", sans-serif; font-size:20px; color:white;margin: 10px 0px 0px 0px'>Users</p></a>
                    <a href='settings' class='w3-bar-item w3-button'><img src='/static/settings-icon-64x64.png' alt='Settings' style='width:47px;height:32px;padding:0px 15px 0px 0px;float:left'><p style='font-family:\"Roboto\", sans-serif; font-size:20px; color:white;margin: 2px 0px 0px 0px'>Settings</p></a>
                    <a href='logout' class='w3-bar-item w3-button'><img src='/static/logout-icon-64x64.png' alt='Logout' style='width:47px;height:32px;padding:0px 15px 0px 0px;float:left'><p style='font-family:\"Roboto\", sans-serif; font-size:20px; color:white;margin: 2px 0px 0px 0px'>Logout</p></a>
                    <br>
                    <br>"""
        return_str += draw_status()
        return_str += """
            </div>
            <div style="margin-left:320px; margin-right:70px">
                <div style="w3-container">
                    <br>
                    <h2>Users</h2>
                    <br>
                    <table>
                        <tr style='background-color: white'>
                            <th>Full Name</th><th>Username</th><th>Email</th>
                        </tr>"""
        
        database = "openplc.db"
        conn = create_connection(database)
        if (conn != None):
            try:
                cur = conn.cursor()
                cur.execute("SELECT user_id, name, username, email FROM Users")
                rows = cur.fetchall()
                cur.close()
                conn.close()
                
                for row in rows:
                    return_str += "<tr onclick=\"document.location='edit-user?table_id=" + str(row[0]) + "'\">"
                    return_str += "<td>" + str(row[1]) + "</td><td>" + str(row[2]) + "</td><td>" + str(row[3]) + "</td></tr>"
                
                return_str += """
                </table>
                    <br>
                    <center><a href="add-user" class="button" style="width: 310px; height: 53px; margin: 0px 20px 0px 20px;"><b>Add new user</b></a></center>
                </div>
            </div>
        </div>
    </body>
</html>"""
            except Error as e:
                print("error connecting to the database" + str(e))
                return_str += 'Error connecting to the database. Make sure that your openplc.db file is not corrupt.<br><br>Error: ' + str(e)
        else:
            return_str += 'Error connecting to the database. Make sure that your openplc.db file is not corrupt.'
        
        return return_str


@app.route('/add-user', methods=['GET', 'POST'])
def add_user():
    if (flask_login.current_user.is_authenticated == False):
        return flask.redirect(flask.url_for('login'))
    else:
        if (openplc_runtime.status() == "Compiling"): return draw_compiling_page()
        if (flask.request.method == 'GET'):
            return_str = pages.w3_style + pages.style + draw_top_div()
            return_str += """
                <div class='main'>
                    <div class='w3-sidebar w3-bar-block' style='width:250px; background-color:#1F1F1F'>
                        <br>
                        <br>
                        <a href="dashboard" class="w3-bar-item w3-button"><img src="/static/home-icon-64x64.png" alt="Dashboard" style="width:47px;height:32px;padding:0px 15px 0px 0px;float:left"><p style='font-family:"Roboto", sans-serif; font-size:20px; color:white;margin: 2px 0px 0px 0px'>Dashboard</p></a>
                        <a href='programs' class='w3-bar-item w3-button'><img src='/static/programs-icon-64x64.png' alt='Programs' style='width:47px;height:32px;padding:0px 15px 0px 0px;float:left'><p style='font-family:\"Roboto\", sans-serif; font-size:20px; color:white;margin: 2px 0px 0px 0px'>Programs</p></a>
                        <a href='modbus' class='w3-bar-item w3-button'><img src='/static/modbus-icon-512x512.png' alt='Modbus' style='width:47px;height:32px;padding:0px 15px 0px 0px;float:left'><p style='font-family:\"Roboto\", sans-serif; font-size:20px; color:white;margin: 2px 0px 0px 0px'>Slave Devices</p></a>
                        <a href='monitoring' class='w3-bar-item w3-button'><img src='/static/monitoring-icon-64x64.png' alt='Monitoring' style='width:47px;height:32px;padding:0px 15px 0px 0px;float:left'><p style='font-family:\"Roboto\", sans-serif; font-size:20px; color:white;margin: 2px 0px 0px 0px'>Monitoring</p></a>
                        <a href='hardware' class='w3-bar-item w3-button'><img src='/static/hardware-icon-980x974.png' alt='Hardware' style='width:47px;height:32px;padding:0px 15px 0px 0px;float:left'><p style='font-family:\"Roboto\", sans-serif; font-size:20px; color:white;margin: 2px 0px 0px 0px'>Hardware</p></a>
                        <a href="users" class="w3-bar-item w3-button" style="background-color:#0066FC; padding-right:0px;padding-top:0px;padding-bottom:0px"><img src="/static/users-icon-64x64.png" alt="Users" style="width:47px;height:39px;padding:7px 15px 0px 0px;float:left"><img src="/static/arrow.png" style="width:17px;height:49px;padding:0px 0px 0px 0px;margin: 0px 0px 0px 0px; float:right"><p style='font-family:"Roboto", sans-serif; font-size:20px; color:white;margin: 10px 0px 0px 0px'>Users</p></a>
                        <a href='settings' class='w3-bar-item w3-button'><img src='/static/settings-icon-64x64.png' alt='Settings' style='width:47px;height:32px;padding:0px 15px 0px 0px;float:left'><p style='font-family:\"Roboto\", sans-serif; font-size:20px; color:white;margin: 2px 0px 0px 0px'>Settings</p></a>
                        <a href='logout' class='w3-bar-item w3-button'><img src='/static/logout-icon-64x64.png' alt='Logout' style='width:47px;height:32px;padding:0px 15px 0px 0px;float:left'><p style='font-family:\"Roboto\", sans-serif; font-size:20px; color:white;margin: 2px 0px 0px 0px'>Logout</p></a>
                        <br>
                        <br>"""
            return_str += draw_status() + pages.add_user_tail
            return return_str
            
        elif (flask.request.method == 'POST'):
            name = flask.request.form['full_name']
            username = flask.request.form['user_name']
            email = flask.request.form['user_email']
            password = flask.request.form['user_password']

            (name, username, email) = sanitize_input(name, username, email)

            form_has_picture = True
            if ('file' not in flask.request.files):
                form_has_picture = False
            
            database = "openplc.db"
            conn = create_connection(database)
            if (conn != None):
                try:
                    cur = conn.cursor()
                    if (form_has_picture):
                        pict_file = flask.request.files['file']
                        if (pict_file.filename != ''):
                            # Ensure the file is allowed
                            if not is_allowed_file(pict_file):
                                return 'Invalid file format. Only JPEG, PNG, and GIF images are allowed.', 400

                            file_extension = pict_file.filename.split('.')
                            filename = str(random.randint(1,1000000)) + "." + file_extension[-1]
                            pict_file.save(os.path.join('static', filename))
                            cur.execute("INSERT INTO Users (name, username, email, password, pict_file) VALUES (?, ?, ?, ?, ?)", (name, username, email, password, "/static/"+filename))
                        else:
                            cur.execute("INSERT INTO Users (name, username, email, password) VALUES (?, ?, ?, ?)", (name, username, email, password))
                    else:
                        cur.execute("INSERT INTO Users (name, username, email, password) VALUES (?, ?, ?, ?)", (name, username, email, password))
                    conn.commit()
                    cur.close()
                    conn.close()
                    return flask.redirect(flask.url_for('users'))
                    
                except Error as e:
                    print("error connecting to the database" + str(e))
                    return 'Error connecting to the database. Make sure that your openplc.db file is not corrupt.<br><br>Error: ' + str(e)
            else:
                return 'Error connecting to the database. Make sure that your openplc.db file is not corrupt.'


@app.route('/edit-user', methods=['GET', 'POST'])
def edit_user():
    if (flask_login.current_user.is_authenticated == False):
        return flask.redirect(flask.url_for('login'))
    else:
        if (openplc_runtime.status() == "Compiling"): return draw_compiling_page()
        if (flask.request.method == 'GET'):
            user_id = flask.request.args.get('table_id')
            return_str = pages.w3_style + pages.style + draw_top_div()
            return_str += """
                <div class='main'>
                    <div class='w3-sidebar w3-bar-block' style='width:250px; background-color:#1F1F1F'>
                        <br>
                        <br>
                        <a href="dashboard" class="w3-bar-item w3-button"><img src="/static/home-icon-64x64.png" alt="Dashboard" style="width:47px;height:32px;padding:0px 15px 0px 0px;float:left"><p style='font-family:"Roboto", sans-serif; font-size:20px; color:white;margin: 2px 0px 0px 0px'>Dashboard</p></a>
                        <a href='programs' class='w3-bar-item w3-button'><img src='/static/programs-icon-64x64.png' alt='Programs' style='width:47px;height:32px;padding:0px 15px 0px 0px;float:left'><p style='font-family:\"Roboto\", sans-serif; font-size:20px; color:white;margin: 2px 0px 0px 0px'>Programs</p></a>
                        <a href='modbus' class='w3-bar-item w3-button'><img src='/static/modbus-icon-512x512.png' alt='Modbus' style='width:47px;height:32px;padding:0px 15px 0px 0px;float:left'><p style='font-family:\"Roboto\", sans-serif; font-size:20px; color:white;margin: 2px 0px 0px 0px'>Slave Devices</p></a>
                        <a href='monitoring' class='w3-bar-item w3-button'><img src='/static/monitoring-icon-64x64.png' alt='Monitoring' style='width:47px;height:32px;padding:0px 15px 0px 0px;float:left'><p style='font-family:\"Roboto\", sans-serif; font-size:20px; color:white;margin: 2px 0px 0px 0px'>Monitoring</p></a>
                        <a href='hardware' class='w3-bar-item w3-button'><img src='/static/hardware-icon-980x974.png' alt='Hardware' style='width:47px;height:32px;padding:0px 15px 0px 0px;float:left'><p style='font-family:\"Roboto\", sans-serif; font-size:20px; color:white;margin: 2px 0px 0px 0px'>Hardware</p></a>
                        <a href="users" class="w3-bar-item w3-button" style="background-color:#0066FC; padding-right:0px;padding-top:0px;padding-bottom:0px"><img src="/static/users-icon-64x64.png" alt="Users" style="width:47px;height:39px;padding:7px 15px 0px 0px;float:left"><img src="/static/arrow.png" style="width:17px;height:49px;padding:0px 0px 0px 0px;margin: 0px 0px 0px 0px; float:right"><p style='font-family:"Roboto", sans-serif; font-size:20px; color:white;margin: 10px 0px 0px 0px'>Users</p></a>
                        <a href='settings' class='w3-bar-item w3-button'><img src='/static/settings-icon-64x64.png' alt='Settings' style='width:47px;height:32px;padding:0px 15px 0px 0px;float:left'><p style='font-family:\"Roboto\", sans-serif; font-size:20px; color:white;margin: 2px 0px 0px 0px'>Settings</p></a>
                        <a href='logout' class='w3-bar-item w3-button'><img src='/static/logout-icon-64x64.png' alt='Logout' style='width:47px;height:32px;padding:0px 15px 0px 0px;float:left'><p style='font-family:\"Roboto\", sans-serif; font-size:20px; color:white;margin: 2px 0px 0px 0px'>Logout</p></a>
                        <br>
                        <br>"""
            return_str += draw_status()
            return_str += """
                </div>
                <div style="margin-left:320px; margin-right:70px">
                    <div style="w3-container">
                        <br>
                        <h2>Edit User</h2>
                        <br>
                        <form   id    = "uploadForm"
                            enctype   =  "multipart/form-data"
                            action    =  "edit-user"
                            method    =  "post"
                            onsubmit  =  "return validateForm()">"""
                        
            database = "openplc.db"
            conn = create_connection(database)
            if (conn != None):
                try:
                    cur = conn.cursor()
                    cur.execute("SELECT * FROM Users WHERE user_id = ?", (int(user_id),))
                    row = cur.fetchone()
                    cur.close()
                    conn.close()
                    return_str += "<input type='hidden' value='" + user_id + "' id='user_id' name='user_id'/>" 
                    return_str += "<label for='full_name'><b>Name</b></label><input type='text' id='full_name' name='full_name' value='" + str(row[1]) + "'>"
                    return_str += "<label for='user_name'><b>Username</b></label><input type='text' id='user_name' name='user_name' value='" + str(row[2]) + "'>"
                    return_str += "<label for='user_email'><b>Email</b></label><input type='text' id='user_email' name='user_email' value='" + str(row[3]) + "'>"
                    return_str += """
                            <label for='user_password'><b>Password</b></label>
                            <input type='password' id='user_password' name='user_password' value='mypasswordishere'>
                            <label for='uploadForm'><b>Picture</b></label>
                            <br>
                            <br>
                            <input type="file" name="file" id="file" class="inputfile" accept="image/*">
                            <br>
                            <br>
                            <center><input type="submit" class="button" style="font-weight:bold; width: 310px; height: 53px; margin: 0px 20px 0px 20px;" value='Save changes'><a href='delete-user?user_id="""
                    return_str += user_id
                    return_str += """' class="button" style="width: 310px; height: 53px; margin: 0px 20px 0px 20px;"><b>Delete user</b></a></center>
                        </form>
                    </div>
                </div>
            </div>
        </body>
    <script>
        function validateForm()
        {
            var username = document.forms["uploadForm"]["user_name"].value;
            var password = document.forms["uploadForm"]["user_password"].value;
            if (username == "" || password == "")
            {
                alert("Username and Password cannot be blank");
                return false;
            }
            return true;
        }
    </script>
</html>"""
                except Error as e:
                    print("error connecting to the database" + str(e))
                    return_str += 'Error connecting to the database. Make sure that your openplc.db file is not corrupt.<br><br>Error: ' + str(e)
            else:
                return_str += 'Error connecting to the database. Make sure that your openplc.db file is not corrupt.'
            
            return return_str
            
        elif (flask.request.method == 'POST'):
            user_id = flask.request.form['user_id']
            name = flask.request.form['full_name']
            username = flask.request.form['user_name']
            email = flask.request.form['user_email']
            password = flask.request.form['user_password']
            (user_id, name, username, email) = sanitize_input(user_id, name, username, email)
            form_has_picture = True
            if ('file' not in flask.request.files):
                form_has_picture = False
            
            database = "openplc.db"
            conn = create_connection(database)
            if (conn != None):
                try:
                    cur = conn.cursor()
                    if (password != "mypasswordishere"):
                        cur.execute("UPDATE Users SET name = ?, username = ?, email = ?, password = ? WHERE user_id = ?", (name, username, email, password, int(user_id)))
                    else:
                        cur.execute("UPDATE Users SET name = ?, username = ?, email = ? WHERE user_id = ?", (name, username, email, int(user_id)))
                    conn.commit()
                    if (form_has_picture):
                        pict_file = flask.request.files['file']
                        if (pict_file.filename != ''):
                            # Ensure the file is allowed
                            if not is_allowed_file(pict_file):
                                return 'Invalid file format. Only JPEG, PNG, and GIF images are allowed.', 400
                            
                            file_extension = pict_file.filename.split('.')
                            filename = str(random.randint(1,1000000)) + "." + file_extension[-1]
                            pict_file.save(os.path.join('static', filename))
                            cur.execute("UPDATE Users SET pict_file = ? WHERE user_id = ?", ("/static/"+filename, int(user_id)))
                            conn.commit()
                    cur.close()
                    conn.close()
                    return flask.redirect(flask.url_for('users'))
                    
                except Error as e:
                    print("error connecting to the database" + str(e))
                    return 'Error connecting to the database. Make sure that your openplc.db file is not corrupt.<br><br>Error: ' + str(e)
            else:
                return 'Error connecting to the database. Make sure that your openplc.db file is not corrupt.'


@app.route('/delete-user', methods=['GET', 'POST'])
def delete_user():
    if (flask_login.current_user.is_authenticated == False):
        return flask.redirect(flask.url_for('login'))
    else:
        if (openplc_runtime.status() == "Compiling"): return draw_compiling_page()
        user_id = flask.request.args.get('user_id')
        database = "openplc.db"
        conn = create_connection(database)
        if (conn != None):
            try:
                cur = conn.cursor()
                cur.execute("SELECT username FROM Users WHERE user_id = ?", (int(user_id),))
                row = cur.fetchone()
                if (flask_login.current_user.id == row[0]):
                    cur.close()
                    conn.close()
                    return draw_blank_page() + "<h2>Error</h2><p>You cannot delete yourself!<br><br>Use the back-arrow on your browser to return</p></div></div></div></body></html>"
                else:
                    cur = conn.cursor()
                    cur.execute("DELETE FROM Users WHERE user_id = ?", (int(user_id),))
                    conn.commit()
                    cur.close()
                    conn.close()
                    return flask.redirect(flask.url_for('users'))
            except Error as e:
                print("error connecting to the database" + str(e))
                return 'Error connecting to the database. Make sure that your openplc.db file is not corrupt.<br><br>Error: ' + str(e)
        else:
            return 'Error connecting to the database. Make sure that your openplc.db file is not corrupt.'


@app.route('/settings', methods=['GET', 'POST'])
def settings():
    if (flask_login.current_user.is_authenticated == False):
        return flask.redirect(flask.url_for('login'))
    else:
        monitor.stop_monitor()
        if (openplc_runtime.status() == "Compiling"): return draw_compiling_page()
        if (flask.request.method == 'GET'):
            return_str = pages.w3_style + pages.settings_style + draw_top_div() + pages.settings_head
            return_str += draw_status()
            return_str += """
            </div>
            <div style="margin-left:320px; margin-right:70px">
                <div style="w3-container">
                    <br>
                    <h2>Settings</h2>
                    <form id        = "uploadForm"
                        enctype     = "multipart/form-data"
                        action      = "settings"
                        method      = "post"
                        onsubmit    = "return validateForm()">"""

            # Get hostname
            device_hostname = socket.gethostname()

            if device_hostname != None:
                return_str += """
                        <b>Change Hostname</b>
                        <br>
                        <p>Hostname allows you to access the OpenPLC Runtime dashboard from another computer on the same network using """ + device_hostname + """.local:8080</p>
                        <p>Changes to hostname will only take effect after a reboot</p>
                        <label for='device_hostname'>
                            <b>Hostname</b>
                        </label>
                        <input type='text' id='device_hostname' name='device_hostname' value='""" + device_hostname + """'>
                        <br>
                        <br>
                        <br>
                        <label class="container">
                            <b>Enable Modbus Server</b>"""
            else:
                return_str += """
                        <label class="container">
                            <b>Enable Modbus Server</b>"""
            
            database = "openplc.db"
            conn = create_connection(database)
            if (conn != None):
                try:
                    cur = conn.cursor()
                    cur.execute("SELECT * FROM Settings")
                    rows = cur.fetchall()
                    cur.close()
                    conn.close()
                    
                    for row in rows:
                        if (row[0] == "Modbus_port"):
                            modbus_port = str(row[1])
                        elif (row[0] == "Dnp3_port"):
                            dnp3_port = str(row[1])
                        elif (row[0] == "Enip_port"):
                            enip_port = str(row[1])
                        elif (row[0] == "Pstorage_polling"):
                            pstorage_poll = str(row[1])
                        elif (row[0] == "Start_run_mode"):
                            start_run = str(row[1])
                        elif (row[0] == "Slave_polling"):
                            slave_polling = str(row[1])
                        elif (row[0] == "Slave_timeout"):
                            slave_timeout = str(row[1])
                        elif (row[0] == "snap7"):
                            start_snap7 = str(row[1])
                            
                    
                    if (modbus_port == 'disabled'):
                        return_str += """
                            <input id="modbus_server" type="checkbox">
                            <span class="checkmark"></span>
                        </label>
                        <label for='modbus_server_port'><b>Modbus Server Port</b></label>
                        <input type='text' id='modbus_server_port' name='modbus_server_port' value='502'>"""
                    else:
                        return_str += """
                            <input id="modbus_server" type="checkbox" checked>
                            <span class="checkmark"></span>
                        </label>
                        <label for='modbus_server_port'><b>Modbus Server Port</b></label>
                        <input type='text' id='modbus_server_port' name='modbus_server_port' value='""" + modbus_port + "'>"
                        
                    return_str += """
                        <br>
                        <br>
                        <br>
                        <label class="container">
                            <b>Enable S7 Protocol</b>"""
                            
                    if (start_snap7 == 'false'):
                        return_str += """
                            <input id="snap7_run" type="checkbox">
                            <span class="checkmark"></span>
                        </label>
                        <input type='hidden' value='false' id='snap7_run_text' name='snap7_run_text'/>"""
                    else:
                        return_str += """
                            <input id="snap7_run" type="checkbox" checked>
                            <span class="checkmark"></span>
                        </label>
                        <input type='hidden' value='true' id='snap7_run_text' name='snap7_run_text'/>"""

                    return_str += """
                        <br>
                        <br>
                        <label class="container">
                            <b>Enable DNP3 Server</b>"""
                    
                    if (dnp3_port == 'disabled'):
                        return_str += """
                            <input id="dnp3_server" type="checkbox">
                            <span class="checkmark"></span>
                        </label>
                        <label for='dnp3_server_port'><b>DNP3 Server Port</b></label>
                        <input type='text' id='dnp3_server_port' name='dnp3_server_port' value='20000'>"""
                    else:
                        return_str += """
                            <input id="dnp3_server" type="checkbox" checked>
                            <span class="checkmark"></span>
                        </label>
                        <label for='dnp3_server_port'><b>DNP3 Server Port</b></label>
                        <input type='text' id='dnp3_server_port' name='dnp3_server_port' value='""" + dnp3_port + "'>"
                    
                    return_str += """
                        <br>
                        <br>
                        <br>
                        <label class="container">
                            <b>Enable EtherNet/IP Server</b>"""
                            
                    if (enip_port == 'disabled'):
                        return_str += """
                            <input id="enip_server" type="checkbox">
                            <span class="checkmark"></span>
                        </label>
                        <label for='enip_server_port'><b>EtherNet/IP Server Port</b></label>
                        <input type='text' id='enip_server_port' name='enip_server_port' value='44818'>"""
                    else:
                        return_str += """
                            <input id="enip_server" type="checkbox" checked>
                            <span class="checkmark"></span>
                        </label>
                        <label for='enip_server_port'><b>EtherNet/IP Server Port</b></label>
                        <input type='text' id='enip_server_port' name='enip_server_port' value='""" + enip_port + "'>"
                    
                    return_str += """
                        <br>
                        <br>
                        <br>
                        <label class="container">
                            <b>Enable Persistent Storage Thread</b>"""
                            
                    if (pstorage_poll == 'disabled'):
                        return_str += """
                            <input id="pstorage_thread" type="checkbox">
                            <span class="checkmark"></span>
                        </label>
                        <label for='pstorage_thread_poll'><b>Persistent Storage polling rate</b></label>
                        <input type='text' id='pstorage_thread_poll' name='pstorage_thread_poll' value='10'>"""
                    else:
                        return_str += """
                            <input id="pstorage_thread" type="checkbox" checked>
                            <span class="checkmark"></span>
                        </label>
                        <label for='pstorage_thread_poll'><b>Persistent Storage polling rate</b></label>
                        <input type='text' id='pstorage_thread_poll' name='pstorage_thread_poll' value='""" + pstorage_poll + "'>"
                    
                    return_str += """
                        <br>
                        <br>
                        <br>
                        <label class="container">
                            <b>Start OpenPLC in RUN mode</b>"""
                            
                    if (start_run == 'false'):
                        return_str += """
                            <input id="auto_run" type="checkbox">
                            <span class="checkmark"></span>
                        </label>
                        <input type='hidden' value='false' id='auto_run_text' name='auto_run_text'/>"""
                    else:
                        return_str += """
                            <input id="auto_run" type="checkbox" checked>
                            <span class="checkmark"></span>
                        </label>
                        <input type='hidden' value='true' id='auto_run_text' name='auto_run_text'/>"""                   

                    return_str += """
                        <br>
                        <h2>Slave Devices</h2>
                        <label for='slave_polling_period'><b>Polling Period (ms)</b></label>
                        <input type='text' id='slave_polling_period' name='slave_polling_period' value='""" + slave_polling + "'>"
                    
                    return_str += """
                        <br>
                        <br>
                        <br>
                        <label for='slave_timeout'><b>Timeout (ms)</b></label>
                        <input type='text' id='slave_timeout' name='slave_timeout' value='""" + slave_timeout + "'>"
                    
                    return_str += pages.settings_tail
                    
                except Error as e:
                    return_str += "error connecting to the database" + str(e)
            else:
                return_str += "Error opening DB"

            return return_str

        elif (flask.request.method == 'POST'):
            modbus_port = flask.request.form.get('modbus_server_port')
            dnp3_port = flask.request.form.get('dnp3_server_port')
            enip_port = flask.request.form.get('enip_server_port')
            pstorage_poll = flask.request.form.get('pstorage_thread_poll')
            start_run = flask.request.form.get('auto_run_text')
            start_snap7 = flask.request.form.get('snap7_run_text')
            slave_polling = flask.request.form.get('slave_polling_period')
            slave_timeout = flask.request.form.get('slave_timeout')
            device_hostname = flask.request.form.get('device_hostname')

            (modbus_port, dnp3_port, enip_port, pstorage_poll, start_run, start_snap7, slave_polling, slave_timeout, device_hostname) = sanitize_input(modbus_port, dnp3_port, enip_port, pstorage_poll, start_run, start_snap7, slave_polling, slave_timeout, device_hostname)

            # Change hostname if needed
            current_hostname = socket.gethostname()
            if current_hostname != None and current_hostname != device_hostname:
                subprocess.run(['hostnamectl', 'set-hostname', device_hostname])

            database = "openplc.db"
            conn = create_connection(database)
            if (conn != None):
                try:
                    cur = conn.cursor()
                    if (modbus_port == None):
                        cur.execute("UPDATE Settings SET Value = 'disabled' WHERE Key = 'Modbus_port'")
                        conn.commit()
                    else:
                        cur.execute("UPDATE Settings SET Value = ? WHERE Key = 'Modbus_port'", (str(modbus_port),))
                        conn.commit()
                        
                    if (dnp3_port == None):
                        cur.execute("UPDATE Settings SET Value = 'disabled' WHERE Key = 'Dnp3_port'")
                        conn.commit()
                    else:
                        cur.execute("UPDATE Settings SET Value = ? WHERE Key = 'Dnp3_port'", (str(dnp3_port),))
                        conn.commit()
                        
                    if (enip_port == None):
                        cur.execute("UPDATE Settings SET Value = 'disabled' WHERE Key = 'Enip_port'")
                        conn.commit()
                    else:
                        cur.execute("UPDATE Settings SET Value = ? WHERE Key = 'Enip_port'", (str(enip_port),))
                        conn.commit()
                        
                    if (pstorage_poll == None):
                        cur.execute("UPDATE Settings SET Value = 'disabled' WHERE Key = 'Pstorage_polling'")
                        conn.commit()
                    else:
                        cur.execute("UPDATE Settings SET Value = ? WHERE Key = 'Pstorage_polling'", (str(pstorage_poll),))
                        conn.commit()
                        
                    if (start_run == 'true'):
                        cur.execute("UPDATE Settings SET Value = 'true' WHERE Key = 'Start_run_mode'")
                        conn.commit()
                    else:
                        cur.execute("UPDATE Settings SET Value = 'false' WHERE Key = 'Start_run_mode'")
                        conn.commit()
                        
                    if (start_snap7 == 'true'):
                        cur.execute("UPDATE Settings SET Value = 'true' WHERE Key = 'snap7'")
                        conn.commit()
                    else:
                        cur.execute("UPDATE Settings SET Value = 'false' WHERE Key = 'snap7'")
                        conn.commit()

                    cur.execute("UPDATE Settings SET Value = ? WHERE Key = 'Slave_polling'", (str(slave_polling),))
                    conn.commit()
                    
                    cur.execute("UPDATE Settings SET Value = ? WHERE Key = 'Slave_timeout'", (str(slave_timeout),))
                    conn.commit()
                    
                    cur.close()
                    conn.close()
                    configure_runtime()
                    generate_mbconfig()
                    return flask.redirect(flask.url_for('dashboard'))
                    
                except Error as e:
                    print("error connecting to the database" + str(e))
                    return 'Error connecting to the database. Make sure that your openplc.db file is not corrupt.<br><br>Error: ' + str(e)
            else:
                return 'Error connecting to the database. Make sure that your openplc.db file is not corrupt.'
        

@app.route('/logout')
def logout():
    if (flask_login.current_user.is_authenticated == False):
        return flask.redirect(flask.url_for('login'))
    else:
        monitor.stop_monitor()
        flask_login.logout_user()
        return flask.redirect(flask.url_for('login'))


@login_manager.unauthorized_handler
def unauthorized_handler():
    return 'Unauthorized'
    
#----------------------------------------------------------------------------
#Creates a connection with the SQLite database.
#----------------------------------------------------------------------------
""" Create a connection to the database file """
def create_connection(db_file):
   try:
      conn = sqlite3.connect(db_file)
      return conn
   except Error as e:
      print(e)

   return None


#----------------------------------------------------------------------------
#Returns a generator that yields the sanitized arguments.
#----------------------------------------------------------------------------
def sanitize_input(*args):
   return (escape(a) for a in args)

#----------------------------------------------------------------------------
# Taken from the html module of the python 3.9 standard library
# exact lines of code can be found here:
# https://github.com/python/cpython/blob/3.9/Lib/html/__init__.py#L12
# Modified to convert to String but preserve NoneType.
# Preserving NoneType is necessary to ensure program logic is not affected by None being converted to "None",
# this is relevant in setttings()
#----------------------------------------------------------------------------
def escape(s, quote=True):
    """
    Replace special characters "&", "<" and ">" to HTML-safe sequences.
    If the optional flag quote is true (the default), the quotation mark
    characters, both double quote (") and single quote (') characters are also
    translated.
    """
    if s is None: 
        return s
    s = str(s) # force string
    s = s.replace("&", "&amp;") # Must be done first!
    s = s.replace("<", "&lt;")
    s = s.replace(">", "&gt;")
    if quote:
        s = s.replace('"', "&quot;")
        s = s.replace('\'', "&#x27;")
    return s


#----------------------------------------------------------------------------
#Main dummy function. Only displays a message and exits. The app keeps
#running on the background by Flask
#----------------------------------------------------------------------------
def main():
   print("Starting the web interface...")
   
if __name__ == '__main__':
    #Load information about current program on the openplc_runtime object
    file = open("active_program", "r")
    st_file = file.read()
    st_file = st_file.replace('\r','').replace('\n','')
    
    database = "openplc.db"
    conn = create_connection(database)
    if (conn != None):
        try:
            cur = conn.cursor()
            cur.execute("SELECT * FROM Programs WHERE File=?", (st_file,))
            #cur.execute("SELECT * FROM Programs")
            row = cur.fetchone()
            openplc_runtime.project_name = str(row[1])
            openplc_runtime.project_description = str(row[2])
            openplc_runtime.project_file = str(row[3])
            
            cur.execute("SELECT * FROM Settings")
            rows = cur.fetchall()
            cur.close()
            conn.close()
            
            for row in rows:
                if (row[0] == "Start_run_mode"):
                    start_run = str(row[1])
                    
            if (start_run == 'true'):
                print("Initializing OpenPLC in RUN mode...")
                openplc_runtime.start_runtime()
                time.sleep(1)
                configure_runtime()
                monitor.parse_st(openplc_runtime.project_file)
            
            app.run(debug=False, host='0.0.0.0', threaded=True, port=8080)
        
        except Error as e:
            print("error connecting to the database" + str(e))
    else:
        print("error connecting to the database")