const http = require('http');
const fs = require('fs');
const path = require('path');
const url = require('url');

const port = process.env.PORT || 3000;

const mimeTypes = {
    '.html': 'text/html',
    '.js': 'text/javascript',
    '.css': 'text/css',
    '.json': 'application/json',
    '.png': 'image/png',
    '.jpg': 'image/jpg',
    '.gif': 'image/gif',
    '.svg': 'image/svg+xml',
    '.ico': 'image/x-icon'
};

const server = http.createServer((req, res) => {
    console.log(`${req.method} ${req.url}`);
    
    let filePath = '.' + url.parse(req.url).pathname;
    
    // Default to index.html
    if (filePath === './') {
        filePath = './index.html';
    }
    
    const extname = String(path.extname(filePath)).toLowerCase();
    const mimeType = mimeTypes[extname] || 'application/octet-stream';
    
    fs.readFile(filePath, (error, content) => {
        if (error) {
            if (error.code === 'ENOENT') {
                // File not found
                res.writeHead(404, { 'Content-Type': 'text/plain' });
                res.end('404 Not Found\n');
            } else {
                // Server error
                res.writeHead(500, { 'Content-Type': 'text/plain' });
                res.end('500 Internal Server Error\n');
            }
        } else {
            // Success
            res.writeHead(200, { 
                'Content-Type': mimeType,
                'Access-Control-Allow-Origin': '*',
                'Access-Control-Allow-Methods': 'GET, POST, PUT, DELETE, OPTIONS',
                'Access-Control-Allow-Headers': 'Content-Type, Authorization'
            });
            res.end(content, 'utf-8');
        }
    });
});

server.listen(port, () => {
    console.log(`JCHAT Client Server running at http://localhost:${port}/`);
});