const express = require('express');
const path = require('path');
const fs = require('fs');
const base64url = require('base64url');
const multer = require('multer');
const { log } = require('console');
const bodyParser = require('body-parser');
const { convertSvgToPng } = require('./utils/imageConverter');
const websocket = require('./websocket');
const translations = require('./translations');

const app = express();
const upload = multer({ storage: multer.memoryStorage() });

// Configure EJS
app.set('view engine', 'ejs');
app.set('views', path.join(__dirname, 'views'));

app.use(express.urlencoded({ extended: true }));
app.use(bodyParser.json({ limit: "50mb" }));

// Serve static files
app.use(express.static(path.join(__dirname, 'public')));

// Initialize WebSocket server
const server = app.listen(80, () => {
    console.log('Server running on port 80');
});
websocket.initialize(server);


 

// Static images mapping
const staticImages = {
    mulberry: 'am_mulberry_logo_wide_color.png' , 
    home: 'payment.png',
    scan: 'Scanner.png',
    printer: 'Check.png',
    settings: 'Settings.png',
    pinpad: 'pinpad.png',
    cashier: 'cashier.png', 
    menu: 'Menu.png', 
};

// Topics list
const topics = [

    { deviceName: 'M50F_Second', deviceID: '01534090202502210057' },
    { deviceName: 'M50F_Igor', deviceID: '01534090202502210142' },
    { deviceName: 'M60_Igor', deviceID: '01620013202312220735' }, 
    { deviceName: 'M70_Igor', deviceID: '01723060202412010280' }, 
    { deviceName: 'M30_Igor', deviceID: '01364100202503060196' },
 
{ deviceName: 'M80F_Ahmed', deviceID: '01804042025072100015' },
 { deviceName: 'M80K_Ahmed', deviceID: '78040132025082600001' },
  { deviceName: 'M50F_Ahmed', deviceID: '01534090202502210065' },
    { deviceName: 'M50F_Ahmed', deviceID: '01534090202502210065' },
    { deviceName: 'M60_Ahmed', deviceID: '01620013202312221500' },
    { deviceName: 'M30_Ahmed', deviceID: '01364100202503060115' },
    { deviceName: 'M20_Ahmed', deviceID: '01220110202305150514' },
    { deviceName: 'M70_Ahmed', deviceID: '01723060202412010160' },
    
    { deviceName: 'M60F-NOSN', deviceID: 'm60f_pos_no_sn' }
];

// Sample configuration
const defaultConfig = {
    type: "configuration",
    navItems: [
        {
            navPage: "NAV_HOME",
            navName: "Оплата",
            icon: { type: "resource", value: "home" },
            position: 0,
            enabled: true
        },
        {
            navPage: "NAV_SCAN",
            navName: "Сканнер",
            icon: { type: "resource", value: "scan" },
            position: 1,
            enabled: true
        },
        {
            navPage: "NAV_PRINTER",
            navName: "Принтер",
            icon: { type: "resource", value: "printer" },
            position: 2,
            enabled: true
        },
        {
            navPage: "NAV_SETTINGS",
            navName: "Настройки",
            icon: { type: "resource", value: "settings" },
            position: 3,
            enabled: true
        }
    ],
    mainLogo: {
        type: "base64",
        value: "data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAABlUAAAE "
    },
    footerLogo: {
        type: "base64",
        value: "data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAABaQAAAWY"
    },
    printLogo: {
        type: "base64",
        value: "data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAABaQAAAWY"
    },
    printURL: "www.mulberrypos.ru",
    footerLogoVisibility: "true",
    bankMode: false,
    footerGreetingText: "Привет Игорь! ))",
    footerText: "Mulberry, OOO Demo ©2025",
    primaryColor: "#002233",
    secondaryColor: "#67777eff",
};

// Routes
app.get('/', (req, res) => {
    res.render('index', {
        staticImages: Object.keys(staticImages),
        topics,
        defaultConfig,
        connectedDevices: websocket.getConnectedDevices()
    });
});

// Health check endpoint
app.get('/health', (req, res) => {
    res.json({
        status: 'healthy',
        websocketConnections: websocket.connectedDevices.size
    });
});
// Graceful shutdown
process.on('SIGTERM', gracefulShutdown);
process.on('SIGINT', gracefulShutdown);

function gracefulShutdown() {
    console.log('Shutting down gracefully...');
    websocket.cleanup();
    server.close(() => {
        console.log('Server closed');
        process.exit(0);
    });
}

app.post('/sendToDevice', (req, res) => {
    const { config, topic } = req.body;
    console.log(`Sending config to device ${topic}`);
    const success = websocket.sendToDevice(topic, config);
    res.status(success ? 200 : 404).send(success ? 'Message sent' : 'Device not connected');
});

// Payment endpoints
// Payment endpoint
app.get('/pay', (req, res) => {
    try {
        const paymentData = JSON.parse(base64url.decode(req.query.data));
        
        if (!paymentData.sn || !paymentData.amount) {
            return res.redirect(`/error?message=${encodeURIComponent('Invalid payment data')}`);
        }
        console.log(paymentData);
        
        // Convert the amount from cents to dollars
const amountInDollars = parseFloat(paymentData.amount) / 100;

// Format the amount to two decimal places
const formattedAmount = amountInDollars.toFixed(2);

    const language = paymentData.lang;
// Get translations for the selected language
  const t = translations[language] || translations.en;

//   const event = new Date(paymentData.time);

// const russianDate = event.toLocaleString("ru-RU", { timeZone: "Etc/GMT-3" })
 

const event = new Date(paymentData.time);
const russianDate = event.toLocaleString("ru-RU", {
    timeZone: "Europe/Moscow",
    year: 'numeric',
    month: '2-digit',
    day: '2-digit',
    hour: '2-digit',
    minute: '2-digit',
    second: '2-digit',
    hour12: false
}).replace(',', '');

        // Format data for the receipt
        const receiptData = {
            deviceId: paymentData.sn,
            t:t,
            appLogo: paymentData.appLogo,
            appColor: paymentData.appColor,
            currencyS: paymentData.currencyS,
            paymentMethod: "QR Code",
            amount: formattedAmount,
            timestamp: russianDate
            ,
            transactionId: `TXN-${Math.random().toString(36).substr(2, 9).toUpperCase()}`
        };
        
        // Render EJS template with data
        res.render('receipt', { 
            title: 'DatexPay Virtual Bank - Receipt',
            ...receiptData
        });
        
    } catch (error) {
        res.redirect(`/error?message=${encodeURIComponent(error.message)}`);
    }
});

app.post('/pay-command', (req, res) => {
    console.log("pay command");
    
    const id = req.query.id;
    websocket.sendToDevice(id, { 
        type: 'payment', 
        action: 'PRINT_RECEIPT',
        status : "success" });
    res.send({ message: 'Receipt print command sent!' });
});

app.post('/cancel-command', (req, res) => {
    

    const id = req.query.id;
    console.log("cancel command id :" + id);
    websocket.sendToDevice(id, { type: 'payment', action: 'REJECT_RECEIPT',
        status : "failed" });
    res.send({ message: 'Receipt rejection command sent!' });
});

// Error page
app.get('/error', (req, res) => {
    res.render('error', {
        title: 'Payment Error',
        message: req.query.message || 'An unknown error occurred'
    });
});

// File upload
app.post('/upload', upload.single('image'), async (req, res) => {
    try {
        if (!req.file) {
            return res.status(400).json({ error: 'No file uploaded' });
        }

        let base64Data;
        const isSvg = req.body.isSvg === 'true';

        if (isSvg) {
            const svgContent = req.file.buffer.toString('utf-8');
            const pngBuffer = await convertSvgToPng(svgContent, 'LARGE');
            base64Data = pngBuffer.toString('base64');
        } else {
            base64Data = req.file.buffer.toString('base64');
        }

        res.json({
            success: true,
            base64: `data:image/${isSvg ? 'png' : req.file.mimetype.split('/')[1]};base64,${base64Data}`,
            fileName: req.file.originalname,
            inputName: req.body.inputName
        });
    } catch (error) {
        console.error('Upload error:', error);
        res.status(500).json({ error: 'Image processing failed' });
    }
});