#!/usr/bin/env node

const fs = require('fs');
const path = require('path');
const net = require('net');

const root = process.cwd();
const envPath = path.join(root, '.env');

function parseEnv(filePath) {
  if (!fs.existsSync(filePath)) return {};
  const lines = fs.readFileSync(filePath, 'utf8').split(/\r?\n/);
  const env = {};

  for (const raw of lines) {
    const line = raw.trim();
    if (!line || line.startsWith('#')) continue;
    const idx = line.indexOf('=');
    if (idx <= 0) continue;

    const key = line.slice(0, idx).trim();
    let value = line.slice(idx + 1).trim();

    // Strip trailing comments for unquoted values.
    if (!value.startsWith('"') && !value.startsWith("'")) {
      const hashIdx = value.indexOf(' #');
      if (hashIdx >= 0) value = value.slice(0, hashIdx).trim();
    }

    env[key] = value;
  }

  return env;
}

function checkPortOpen(port, host = '127.0.0.1', timeoutMs = 500) {
  return new Promise(resolve => {
    const socket = new net.Socket();
    let settled = false;

    const done = (isOpen) => {
      if (settled) return;
      settled = true;
      socket.destroy();
      resolve(isOpen);
    };

    socket.setTimeout(timeoutMs);
    socket.once('connect', () => done(true));
    socket.once('timeout', () => done(false));
    socket.once('error', () => done(false));
    socket.connect(Number(port), host);
  });
}

async function run() {
  const env = parseEnv(envPath);

  const backendPort = env.PORT_BACKEND || '4000';
  const frontendPort = env.PORT_FRONTEND_DEV || '5173';
  const frontendFallback = env.PORT_FRONTEND_DEV_FALLBACK || '5174';

  const ports = [
    { name: 'Backend API', key: 'PORT_BACKEND', value: backendPort },
    { name: 'Frontend dev', key: 'PORT_FRONTEND_DEV', value: frontendPort },
    { name: 'Frontend fallback', key: 'PORT_FRONTEND_DEV_FALLBACK', value: frontendFallback },
  ];

  console.log('[ports] Dedicated ports for this project');
  console.log(`[ports] Source: ${envPath}`);
  console.log('');

  for (const p of ports) {
    const isOpen = await checkPortOpen(p.value);
    const state = isOpen ? 'IN USE' : 'free';
    console.log(`[ports] ${p.key}=${p.value} (${p.name}) -> ${state}`);
  }

  console.log('');
  console.log(`[ports] APP_URL=${env.APP_URL || `http://localhost:${frontendPort}`}`);
  console.log(`[ports] API_BASE=${env.API_BASE || `http://localhost:${backendPort}/api`}`);
  console.log(`[ports] VITE_API_URL=${env.VITE_API_URL || `http://localhost:${backendPort}/api`}`);
  if (env.CORS_ORIGIN) console.log(`[ports] CORS_ORIGIN=${env.CORS_ORIGIN}`);
}

run().catch(err => {
  console.error(`[ports] Failed: ${err.message}`);
  process.exit(1);
});