#!/usr/bin/env node
/**
 * Hugging Face Spaces Entrypoint
 * Ensures proper port binding and environment validation for HF Spaces deployment
 */

const {spawn} = require('child_process');
const http = require('http');

const PORT = process.env.PORT || 7860;
const HOST = process.env.HOST || '0.0.0.0';

function validateEnvironment() {
  const required = ['APP_ID', 'WEBHOOK_SECRET', 'PRIVATE_KEY'];
  const missing = required.filter(key => !process.env[key]);

  if (missing.length > 0) {
    console.warn(`WARNING: Missing environment variables: ${missing.join(', ')}`);
    console.warn('The application may not function correctly without these.');
    return false;
  }
  return true;
}

function checkServerHealth() {
  return new Promise((resolve) => {
    const req = http.request(
      {
        hostname: HOST,
        port: PORT,
        path: '/ping',
        method: 'GET',
        timeout: 5000
      },
      (res) => {
        resolve(res.statusCode === 200);
      }
    );
    req.on('error', () => resolve(false));
    req.on('timeout', () => {
      req.destroy();
      resolve(false);
    });
    req.end();
  });
}

async function startServer() {
  console.log(`PRIX starting on ${HOST}:${PORT}...`);

  const isValid = validateEnvironment();
  if (!isValid) {
    console.warn('Proceeding with missing environment variables...');
  }

  const server = spawn('npm', ['start'], {
    stdio: 'inherit',
    env: {...process.env, PORT, HOST}
  });

  server.on('error', (err) => {
    console.error('Failed to start server:', err);
    process.exit(1);
  });

  let healthCheckCount = 0;
  const maxHealthChecks = 12;

  const healthInterval = setInterval(async () => {
    const isHealthy = await checkServerHealth();
    if (isHealthy) {
      console.log('PRIX server is healthy and ready!');
      clearInterval(healthInterval);
    } else {
      healthCheckCount++;
      if (healthCheckCount >= maxHealthChecks) {
        console.warn('Server health check timeout, but continuing...');
        clearInterval(healthInterval);
      }
    }
  }, 5000);

  process.on('SIGTERM', () => {
    console.log('Received SIGTERM, shutting down gracefully...');
    clearInterval(healthInterval);
    server.kill('SIGTERM');
    process.exit(0);
  });

  process.on('SIGINT', () => {
    console.log('Received SIGINT, shutting down gracefully...');
    clearInterval(healthInterval);
    server.kill('SIGINT');
    process.exit(0);
  });
}

startServer();