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

const __dirname = path.dirname(fileURLToPath(import.meta.url));
const PORT = process.env.PORT || 7860;
const DIST_DIR = path.join(__dirname, 'dist');

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

const server = http.createServer((req, res) => {
    // Add COOP/COEP headers for WASM multithreading
    res.setHeader('Cross-Origin-Opener-Policy', 'same-origin');
    res.setHeader('Cross-Origin-Embedder-Policy', 'require-corp');

    // Clean up url path
    let filePath = path.join(DIST_DIR, req.url.split('?')[0]);
    if (filePath === DIST_DIR || filePath.endsWith('/')) {
        filePath = path.join(filePath, 'index.html');
    }

    const ext = path.extname(filePath);
    const contentType = MIME_TYPES[ext] || 'application/octet-stream';

    fs.readFile(filePath, (err, content) => {
        if (err) {
            if (err.code === 'ENOENT') {
                // Fallback to index.html for SPA routing
                fs.readFile(path.join(DIST_DIR, 'index.html'), (errHtml, htmlContent) => {
                    if (errHtml) {
                        res.writeHead(500);
                        res.end('Error loading index.html');
                    } else {
                        res.writeHead(200, { 'Content-Type': 'text/html' });
                        res.end(htmlContent, 'utf-8');
                    }
                });
            } else {
                res.writeHead(500);
                res.end(`Server Error: ${err.code}`);
            }
        } else {
            res.writeHead(200, { 'Content-Type': contentType });
            res.end(content, 'utf-8');
        }
    });
});

server.listen(PORT, '0.0.0.0', () => {
    console.log(`Static server running on http://0.0.0.0:${PORT}`);
});