require('dotenv').config();
const { getRouter } = require('stremio-addon-sdk');
const addonInterface = require('./addon');
const express = require('express');
const path = require('path');
const http = require('http');
const winston = require('winston');

// Configure Winston logger
const logger = winston.createLogger({
    level: 'info',
    format: winston.format.combine(
        winston.format.timestamp(),
        winston.format.printf(({ level, message, timestamp }) => {
            return `${timestamp} ${level}: ${message}`;
        })
    ),
    transports: [
        new winston.transports.Console(),
        new winston.transports.File({ filename: 'error.log', level: 'error' }),
        new winston.transports.File({ filename: 'combined.log' })
    ]
});

const app = express();

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

// Basic error handling middleware
app.use((err, req, res, next) => {
    logger.error('Unhandled error:', err);
    res.status(500).json({ error: 'Internal server error' });
});

// Health check endpoint
app.get('/health', (req, res) => {
    res.json({ status: 'ok' });
});

// Serve the installation page
app.get('/', (req, res) => {
    res.sendFile(path.join(__dirname, 'public', 'index.html'));
});

let addonRouter = null;

// Handle addon requests
app.use('/:configuration?', (req, res, next) => {
    try {
        if (!addonRouter) {
            const configurationStr = req.params.configuration;
            if (configurationStr) {
                let configuration;
                try {
                    const decodedStr = Buffer.from(configurationStr, 'base64').toString('utf-8');
                    configuration = JSON.parse(decodedStr);
                    logger.debug('Decoded configuration:', {
                        ...configuration,
                        username: configuration.username ? '[REDACTED]' : undefined,
                        password: configuration.password ? '[REDACTED]' : undefined
                    });
                } catch (e) {
                    logger.error('Failed to decode configuration:', e);
                    return res.status(400).json({ error: 'Invalid configuration format' });
                }

                const { username, password } = configuration;
                if (!username || !password) {
                    logger.warn('Missing required configuration parameters');
                    return res.status(400).json({ error: 'Missing username or password' });
                }

                try {
                    const addonWithConfig = addonInterface.setConfiguration({ username, password });
                    addonRouter = getRouter(addonWithConfig);
                    logger.info('Addon router created with configuration');
                } catch (e) {
                    logger.error('Failed to create addon router:', e);
                    return res.status(500).json({ error: 'Failed to initialize addon' });
                }
            } else {
                // If no configuration, use default addon interface
                addonRouter = getRouter(addonInterface);
                logger.info('Addon router created with default configuration');
            }
        }

        addonRouter(req, res, next);
    } catch (error) {
        logger.error('Error in addon middleware:', error);
        next(error);
    }
});

// Handle 404
app.use((req, res) => {
    res.status(404).json({ error: 'Not found' });
});

function startServer(port) {
    return new Promise((resolve, reject) => {
        const server = http.createServer(app);

        // Handle server errors
        server.on('error', (error) => {
            if (error.code === 'EADDRINUSE') {
                logger.warn(`Port ${port} is in use, trying ${port + 1}`);
                resolve(startServer(port + 1));
            } else {
                logger.error('Server error:', error);
                reject(error);
            }
        });

        // Handle uncaught exceptions
        process.on('uncaughtException', (error) => {
            logger.error('Uncaught exception:', error);
            process.exit(1);
        });

        // Handle unhandled promise rejections
        process.on('unhandledRejection', (reason, promise) => {
            logger.error('Unhandled Rejection at:', promise, 'reason:', reason);
        });

        // Start the server
        server.listen(port, () => {
            logger.info(`Addon running on http://127.0.0.1:${port}`);
            resolve(server);
        });
    });
}

// Start the server with automatic port selection
startServer(3000).catch(err => {
    logger.error('Failed to start server:', err);
    process.exit(1);
});

// Export for testing
module.exports = { app, startServer };