#!/usr/bin/env node

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

const ROOT = path.resolve(__dirname, '..');
const DIST = path.join(ROOT, 'release');
const COMMANDS = ['prepare', 'check', 'build', 'zip', 'clean'];

function printHelp() {
  console.log('Usage: node scripts/release.js <command>');
  console.log('Commands:');
  console.log('  prepare  Install production deps');
  console.log('  check    Validate release readiness');
  console.log('  build    Copy release files to release/');
  console.log('  zip      Create release zip from release/');
  console.log('  clean    Remove release/ and dist/');
}

function prepare() {
  console.log('Installing production dependencies...');
  execSync('npm install --production', { cwd: ROOT, stdio: 'inherit' });
}

function check() {
  console.log('Checking release readiness...');
  const required = ['index.js', 'package.json'];
  const missing = required.filter(file => !fs.existsSync(path.join(ROOT, file)));
  if (missing.length) {
    console.error('Missing required files:', missing.join(', '));
    process.exit(1);
  }

  const pkg = JSON.parse(fs.readFileSync(path.join(ROOT, 'package.json'), 'utf8'));
  if (!pkg.files || pkg.files.length === 0) {
    console.error('package.json missing "files" field');
    process.exit(1);
  }

  console.log('Check passed.');
}

function build() {
  if (!fs.existsSync(DIST)) {
    fs.mkdirSync(DIST, { recursive: true });
  }

  const pkg = JSON.parse(fs.readFileSync(path.join(ROOT, 'package.json'), 'utf8'));
  const files = pkg.files || [];

  files.forEach(file => {
    const src = path.join(ROOT, file);
    const dest = path.join(DIST, file);
    if (!fs.existsSync(src)) {
      return;
    }

    const stat = fs.statSync(src);
    if (stat.isDirectory()) {
      if (fs.existsSync(dest)) {
        fs.rmSync(dest, { recursive: true });
      }
      fs.mkdirSync(dest, { recursive: true });
      fs.readdirSync(src).forEach(child => {
        const childSrc = path.join(src, child);
        const childDest = path.join(dest, child);
        if (fs.statSync(childSrc).isDirectory()) {
          if (fs.existsSync(childDest)) {
            fs.rmSync(childDest, { recursive: true });
          }
          fs.mkdirSync(childDest, { recursive: true });
          fs.cpSync(childSrc, childDest, { recursive: true });
        } else {
          fs.copyFileSync(childSrc, childDest);
        }
      });
    } else {
      fs.copyFileSync(src, dest);
    }
  });

  const nodeModules = path.join(ROOT, 'node_modules');
  const destModules = path.join(DIST, 'node_modules');
  if (fs.existsSync(nodeModules)) {
    if (fs.existsSync(destModules)) {
      fs.rmSync(destModules, { recursive: true });
    }
    fs.cpSync(nodeModules, destModules, { recursive: true });
  }

  console.log('Release files prepared at:', DIST);
}

function zip() {
  if (!fs.existsSync(DIST)) {
    console.error('release/ not found. Run build first.');
    process.exit(1);
  }

  const outDir = path.join(ROOT, 'dist');
  if (!fs.existsSync(outDir)) {
    fs.mkdirSync(outDir, { recursive: true });
  }

  const safeName = (ROOT.match(/[^\\/]+$/) || ['release'])[0];
  const zipName = `${safeName}-release-${Date.now()}.zip`;
  const zipPath = path.join(outDir, zipName);

  if (process.platform === 'win32') {
    const psCmd = `Compress-Archive -Path 'release\*' -DestinationPath '${zipPath.replace(/'/g, "'")}' -Force`;
    execSync(`powershell -Command "${psCmd}"`, { cwd: ROOT, stdio: 'inherit' });
  } else {
    const excludes = [
      'node_modules/.cache/*',
      'scripts/*',
      '*.git*',
      'release/*',
      'dist/*',
      '.gitignore',
      '*.tgz'
    ];

    const args = ['-r', `"${zipPath}"`, '.'];
    excludes.forEach(exclude => {
      args.push('-x', `"${exclude}"`);
    });

    const command = `zip ${args.join(' ')}`;
    console.log('Running:', command);
    execSync(command, { cwd: ROOT, stdio: 'inherit' });
  }

  const stats = fs.statSync(zipPath);
  const sizeMB = (stats.size / (1024 * 1024)).toFixed(2);
  console.log('Created zip:', zipPath);
  console.log('Zip size:', sizeMB, 'MB');
}

function clean() {
  [DIST, path.join(ROOT, 'dist')].forEach(dir => {
    if (fs.existsSync(dir)) {
      fs.rmSync(dir, { recursive: true });
      console.log('Removed:', dir);
    }
  });
}

const command = process.argv[2];
if (!COMMANDS.includes(command)) {
  printHelp();
  process.exit(1);
}

switch (command) {
  case 'prepare':
    prepare();
    break;
  case 'check':
    check();
    break;
  case 'build':
    build();
    break;
  case 'zip':
    zip();
    break;
  case 'clean':
    clean();
    break;
}