/**
 * JNote 后端启动脚本
 * 跨平台兼容 Windows 和 Linux
 */

const { spawn, execSync } = require('child_process');
const fs = require('fs');
const path = require('path');
const os = require('os');

const scriptDir = __dirname;
process.chdir(scriptDir);

const APP_NAME = 'jnote-api';
const isWindows = os.platform() === 'win32';

function log(msg) {
  console.log(`[Start] ${msg}`);
}

function loadEnv() {
  const envFile = path.join(scriptDir, '.env');
  if (!fs.existsSync(envFile)) {
    log('⚠️  未找到 .env 文件');
    return;
  }

  const content = fs.readFileSync(envFile, 'utf8');
  content.split('\n').forEach(line => {
    line = line.trim();
    if (!line || line.startsWith('#')) return;
    const idx = line.indexOf('=');
    if (idx > 0) {
      const key = line.substring(0, idx).trim();
      let value = line.substring(idx + 1).trim();
      if ((value.startsWith('"') && value.endsWith('"')) ||
          (value.startsWith("'") && value.endsWith("'"))) {
        value = value.slice(1, -1);
      }
      process.env[key] = value;
    }
  });
}

function getExePath() {
  const possibleNames = isWindows
    ? ['jnote-api.exe', 'jnote-api']
    : ['jnote-api', 'jnote-api.exe'];

  for (const name of possibleNames) {
    const p = path.join(scriptDir, name);
    if (fs.existsSync(p)) return p;
  }
  return null;
}

function startWithPM2(exePath) {
  log('🚀 使用 PM2 启动...');

  try {
    execSync('pm2 --version', { stdio: 'ignore' });
  } catch {
    log('📦 安装 PM2...');
    execSync('npm install -g pm2', { cwd: scriptDir, stdio: 'inherit' });
  }

  try {
    execSync(`pm2 stop ${APP_NAME}`, { stdio: 'ignore' });
    execSync(`pm2 delete ${APP_NAME}`, { stdio: 'ignore' });
  } catch {}

  spawn('pm2', ['start', exePath, '--name', APP_NAME], {
    cwd: scriptDir,
    stdio: 'inherit',
    shell: true
  });

  setTimeout(() => {
    try { execSync('pm2 save', { stdio: 'ignore' }); } catch {}
  }, 2000);

  log('✅ 服务已启动');
  log('   状态: pm2 status');
  log('   日志: pm2 logs jnote-api');
}

function startDirect(exePath) {
  log('🚀 直接启动服务...');
  log(`   端口: ${process.env.PORT || 3000}`);
  log('');

  if (!isWindows) {
    fs.chmodSync(exePath, 0o755);
  }

  spawn(exePath, [], {
    cwd: scriptDir,
    stdio: 'inherit',
    env: process.env
  });
}

function main() {
  console.log('=========================================');
  console.log('  JNote 后端启动脚本');
  console.log(`  平台: ${isWindows ? 'Windows' : 'Linux'}`);
  console.log('=========================================');

  loadEnv();

  const exe = getExePath();
  if (!exe) {
    console.error('❌ 错误: 未找到 jnote-api 可执行文件');
    console.error(`   请确保可执行文件与本脚本在同一目录下: ${scriptDir}`);
    console.error('');
    console.error('   Linux 应有: jnote-api');
    console.error('   Windows 应有: jnote-api.exe');
    console.error('');
    console.error('   如果还没有打包，请先运行: node build.js');
    process.exit(1);
  }

  log(`✓ 找到: ${path.basename(exe)}`);

  // 优先使用 PM2
  try {
    execSync('pm2 --version', { stdio: 'ignore' });
    startWithPM2(exe);
  } catch {
    startDirect(exe);
  }
}

main();