import http from 'http';
import fs from 'fs';
import path from 'path';
import { fileURLToPath } from 'url';
import HumanBehaviorEngine from './index.js';
import logger from './utils/logger.js';

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

const engine = new HumanBehaviorEngine();
let isRunning = false;

const mimeTypes = {
  '.html': 'text/html',
  '.js': 'application/javascript',
  '.css': 'text/css',
  '.json': 'application/json',
  '.png': 'image/png',
  '.svg': 'image/svg+xml',
};

function serveStatic(res, filePath) {
  const ext = path.extname(filePath);
  const contentType = mimeTypes[ext] || 'application/octet-stream';

  fs.readFile(filePath, (err, content) => {
    if (err) {
      res.writeHead(404);
      res.end(JSON.stringify({ error: 'not_found' }));
      return;
    }
    res.writeHead(200, { 'Content-Type': contentType });
    res.end(content);
  });
}

async function startEngine() {
  if (isRunning) return { status: 'already_running' };
  isRunning = true;
  await engine.start();
  return { status: 'started' };
}

async function stopEngine() {
  isRunning = false;
  await engine.stop();
  return { status: 'stopped' };
}

async function getStatus() {
  return await engine.getStatus();
}

const server = http.createServer(async (req, res) => {
  const url = new URL(req.url, `http://${req.headers.host}`);

  res.setHeader('Access-Control-Allow-Origin', '*');

  if (req.method === 'GET' && url.pathname === '/health') {
    res.setHeader('Content-Type', 'application/json');
    res.writeHead(200);
    res.end(JSON.stringify({ status: 'ok', uptime: process.uptime() }));
    return;
  }

  if (req.method === 'GET' && url.pathname === '/status') {
    res.setHeader('Content-Type', 'application/json');
    try {
      const status = await getStatus();
      res.writeHead(200);
      res.end(JSON.stringify(status));
    } catch (e) {
      res.writeHead(500);
      res.end(JSON.stringify({ error: e.message }));
    }
    return;
  }

  if (req.method === 'POST' && url.pathname === '/start') {
    res.setHeader('Content-Type', 'application/json');
    try {
      const result = await startEngine();
      res.writeHead(200);
      res.end(JSON.stringify(result));
    } catch (e) {
      res.writeHead(500);
      res.end(JSON.stringify({ error: e.message }));
    }
    return;
  }

  if (req.method === 'POST' && url.pathname === '/stop') {
    res.setHeader('Content-Type', 'application/json');
    try {
      const result = await stopEngine();
      res.writeHead(200);
      res.end(JSON.stringify(result));
    } catch (e) {
      res.writeHead(500);
      res.end(JSON.stringify({ error: e.message }));
    }
    return;
  }

  if (req.method === 'POST' && url.pathname === '/cycle') {
    res.setHeader('Content-Type', 'application/json');
    try {
      const timeout = new Promise((_, reject) =>
        setTimeout(() => reject(new Error('Cycle timed out after 60s')), 60000)
      );
      await Promise.race([engine.runOnce(), timeout]);
      res.writeHead(200);
      res.end(JSON.stringify({ status: 'cycle_complete' }));
    } catch (e) {
      res.writeHead(500);
      res.end(JSON.stringify({ error: e.message }));
    }
    return;
  }

  if (req.method === 'GET') {
    if (url.pathname === '/' || url.pathname === '/index.html') {
      serveStatic(res, path.join(publicDir, 'index.html'));
      return;
    }
    const filePath = path.join(publicDir, url.pathname);
    if (fs.existsSync(filePath) && fs.statSync(filePath).isFile()) {
      serveStatic(res, filePath);
      return;
    }
  }

  res.setHeader('Content-Type', 'application/json');
  res.writeHead(404);
  res.end(JSON.stringify({ error: 'not_found' }));
});

server.listen(PORT, '0.0.0.0', () => {
  logger.info(`Cloud server listening on port ${PORT}`);
  logger.info(`Dashboard: http://localhost:${PORT}`);
  logger.info('Auto-starting simulator...');
  startEngine().catch(e => logger.error(`Auto-start failed: ${e.message}`));
});

process.on('SIGTERM', async () => {
  logger.info('SIGTERM received, stopping engine...');
  await stopEngine();
  process.exit(0);
});

process.on('SIGINT', async () => {
  logger.info('SIGINT received, stopping engine...');
  await stopEngine();
  process.exit(0);
});