// Library imports
const express = require('express');
const router = express.Router();
const fs = require('fs');
const { SerialPort } = require('serialport')
const path = require('path');

// File Imports
const { parseAudioDevice } = require('./stream/parser');
const { configName, serverConfig, configUpdate, configSave, configExists, configPath } = require('./server_config');
const helpers = require('./helpers');
const storage = require('./storage');
const { logInfo, logDebug, logWarn, logError, logFfmpeg, logs } = require('./console');
const dataHandler = require('./datahandler');
const fmdxList = require('./fmdx_list');

// Endpoints
router.get('/', (req, res) => {
    if (configExists() === false) {
        let serialPorts;
        
        SerialPort.list()
        .then((deviceList) => {
            serialPorts = deviceList.map(port => ({
                path: port.path,
                friendlyName: port.friendlyName,
            }));
            
            parseAudioDevice((result) => {
                res.render('wizard', {
                    isAdminAuthenticated: true,
                    videoDevices: result.audioDevices,
                    audioDevices: result.videoDevices,
                    serialPorts: serialPorts
                });
            });
        });
    } else {
        res.render('index', {
            isAdminAuthenticated: req.session.isAdminAuthenticated,
            isTuneAuthenticated: req.session.isTuneAuthenticated,
            tunerName: serverConfig.identification.tunerName,
            tunerDesc: helpers.parseMarkdown(serverConfig.identification.tunerDesc),
            tunerDescMeta: helpers.removeMarkdown(serverConfig.identification.tunerDesc),
            tunerLock: serverConfig.lockToAdmin,
            publicTuner: serverConfig.publicTuner,
            ownerContact: serverConfig.identification.contact,
            antennaSwitch: serverConfig.antennaSwitch,
            tuningLimit: serverConfig.webserver.tuningLimit,
            tuningLowerLimit: serverConfig.webserver.tuningLowerLimit,
            tuningUpperLimit: serverConfig.webserver.tuningUpperLimit,
            chatEnabled: serverConfig.webserver.chatEnabled,
            device: serverConfig.device
        });
    }
});

router.get('/wizard', (req, res) => {
    let serialPorts;
    
    SerialPort.list()
    .then((deviceList) => {
        serialPorts = deviceList.map(port => ({
            path: port.path,
            friendlyName: port.friendlyName,
        }));
        
        parseAudioDevice((result) => {
            res.render('wizard', {
                isAdminAuthenticated: req.session.isAdminAuthenticated,
                videoDevices: result.audioDevices,
                audioDevices: result.videoDevices,
                serialPorts: serialPorts
            });
        });
    })
})

router.get('/setup', (req, res) => {
    let serialPorts; 
    
    SerialPort.list()
    .then((deviceList) => {
        serialPorts = deviceList.map(port => ({
            path: port.path,
            friendlyName: port.friendlyName,
        }));
        
        parseAudioDevice((result) => {
            const processUptimeInSeconds = Math.floor(process.uptime());
            const formattedProcessUptime = helpers.formatUptime(processUptimeInSeconds);
            
            res.render('setup', {
                isAdminAuthenticated: req.session.isAdminAuthenticated,
                videoDevices: result.audioDevices,
                audioDevices: result.videoDevices,
                serialPorts: serialPorts,
                memoryUsage: (process.memoryUsage.rss() / 1024 / 1024).toFixed(1) + ' MB',
                processUptime: formattedProcessUptime,
                consoleOutput: logs,
                onlineUsers: dataHandler.dataToSend.users,
                connectedUsers: storage.connectedUsers
            });
        });
    })
    
});

router.get('/api', (req, res) => {
    const { ps_errors, rt0_errors, rt1_errors, ims, eq, ant, st_forced, previousFreq, txInfo, ...dataToSend } = dataHandler.dataToSend;
    res.json(dataToSend);
});


const authenticate = (req, res, next) => {
    const { password } = req.body;
    
    // Check if the entered password matches the admin password
    if (password === serverConfig.password.adminPass) {
        req.session.isAdminAuthenticated = true;
        req.session.isTuneAuthenticated = true;
        logInfo('User from ' + req.connection.remoteAddress + ' logged in as an administrator.');
        next();
    } else if (password === serverConfig.password.tunePass) {
        req.session.isAdminAuthenticated = false;
        req.session.isTuneAuthenticated = true;
        logInfo('User from ' + req.connection.remoteAddress + ' logged in with tune permissions.');
        next();
    } else {
        res.status(403).json({ message: 'Login failed. Wrong password?' });
    }
};

// Route for login
router.post('/login', authenticate, (req, res) => {
    // Redirect to the main page after successful login
    res.status(200).json({ message: 'Logged in successfully, refreshing the page...' });
});

router.get('/logout', (req, res) => {
    // Clear the session and redirect to the main page
    req.session.destroy(() => {
        res.status(200).json({ message: 'Logged out successfully, refreshing the page...' });
    });
});

router.post('/saveData', (req, res) => {
    const data = req.body;
    let firstSetup;
    if(req.session.isAdminAuthenticated || configExists() === false) {
        configUpdate(data);
        fmdxList.update();
        
        if(configExists() === false) {
            firstSetup = true;
        }
        
        /* TODO: Refactor to server_config.js */
        // Save data to a JSON file
        fs.writeFile(configPath, JSON.stringify(serverConfig, null, 2), (err) => {
            if (err) {
                logError(err);
                res.status(500).send('Internal Server Error');
            } else {
                logInfo('Server config changed successfully.');
                if(firstSetup === true) {
                    res.status(200).send('Data saved successfully!\nPlease, restart the server to load your configuration.');
                } else {
                    res.status(200).send('Data saved successfully!\nSome settings may need a server restart to apply.');
                }
            }
        });
    }
});

router.get('/getData', (req, res) => {  
    if(req.session.isAdminAuthenticated) {
        // Check if the file exists
        fs.access(configPath, fs.constants.F_OK, (err) => {
            if (err) {
                // File does not exist
                res.status(404).send('Data not found');
            } else {
                // File exists, send it as the response
                res.sendFile(path.join(__dirname, '../' + configName + '.json'));
            }
        });
    }
});

router.get('/getDevices', (req, res) => {
    if (req.session.isAdminAuthenticated || !fs.existsSync(configName + '.json')) {
        parseAudioDevice((result) => {
            res.json(result);
        });
    } else {
        res.status(403).json({ error: 'Unauthorized' });
    }
});

/* Static data are being sent through here on connection - these don't change when the server is running */
router.get('/static_data', (req, res) => {
    res.json({
        qthLatitude: serverConfig.identification.lat,
        qthLongitude: serverConfig.identification.lon,
        presets: serverConfig.webserver.presets || [],
        defaultTheme: serverConfig.webserver.defaultTheme || 'theme1'
    });
});

router.get('/server_time', (req, res) => {
    const serverTime = new Date(); // Get current server time
    const serverTimeUTC = new Date(serverTime.getTime() - (serverTime.getTimezoneOffset() * 60000)); // Adjust server time to UTC
    res.json({
        serverTime: serverTimeUTC,
    });
});

router.get('/ping', (req, res) => {
    res.send('pong');
});  


module.exports = router;