/**
 * Simple HTTP Server for Embryo Grading System
 * Node.js server to serve the application
 */

import http from 'http';
import fs from 'fs';
import path from 'path';
import { fileURLToPath } from 'url';

const __filename = fileURLToPath(import.meta.url);
const __dirname = path.dirname(__filename);

const PORT = 8000;

// MIME types for different file extensions
const mimeTypes = {
    '.html': 'text/html',
    '.js': 'text/javascript',
    '.css': 'text/css',
    '.json': 'application/json',
    '.png': 'image/png',
    '.jpg': 'image/jpeg',
    '.jpeg': 'image/jpeg',
    '.gif': 'image/gif',
    '.svg': 'image/svg+xml',
    '.ico': 'image/x-icon',
    '.wasm': 'application/wasm',
    '.onnx': 'application/octet-stream',
    '.pt': 'application/octet-stream',
    '.safetensors': 'application/octet-stream'
};

const server = http.createServer((req, res) => {
    console.log(`${new Date().toISOString()} - ${req.method} ${req.url}`);

    // Parse URL and remove query string
    let filePath = '.' + req.url.split('?')[0];
    
    // Default to login.html instead of index.html
    if (filePath === './') {
        filePath = './login.html';
    }

    // Get file extension
    const extname = String(path.extname(filePath)).toLowerCase();
    const contentType = mimeTypes[extname] || 'application/octet-stream';

    // Read and serve file
    fs.readFile(filePath, (error, content) => {
        if (error) {
            if (error.code === 'ENOENT') {
                // File not found
                res.writeHead(404, { 'Content-Type': 'text/html' });
                res.end('<h1>404 - File Not Found</h1>', 'utf-8');
            } else {
                // Server error
                res.writeHead(500);
                res.end(`Server Error: ${error.code}`, 'utf-8');
            }
        } else {
            // Success
            res.writeHead(200, { 
                'Content-Type': contentType,
                'Access-Control-Allow-Origin': '*'
            });
            res.end(content, 'utf-8');
        }
    });
});

server.listen(PORT, () => {
    console.log('╔════════════════════════════════════════════════════════╗');
    console.log('║       Embryo Grading System - Server Running          ║');
    console.log('╚════════════════════════════════════════════════════════╝');
    console.log('');
    console.log(`  🚀 Server running at: http://localhost:${PORT}`);
    console.log(`  📁 Serving files from: ${__dirname}`);
    console.log('');
    console.log('  Press Ctrl+C to stop the server');
    console.log('');
    console.log('─────────────────────────────────────────────────────────');
});

// Handle server errors
server.on('error', (err) => {
    if (err.code === 'EADDRINUSE') {
        console.error(`\n❌ Error: Port ${PORT} is already in use.`);
        console.error('   Please stop the other server or use a different port.\n');
    } else {
        console.error('\n❌ Server error:', err);
    }
    process.exit(1);
});

// Graceful shutdown
process.on('SIGINT', () => {
    console.log('\n\n🛑 Shutting down server...');
    server.close(() => {
        console.log('✅ Server stopped successfully\n');
        process.exit(0);
    });
});