#!/usr/bin/env node

/**
 * Build script for OxJS
 * Generates ESM, UMD, and minified builds
 */

const { build } = require('vite');
const fs = require('fs');
const path = require('path');
const { minify } = require('terser');

async function buildOx() {
  console.log('Building OxJS...\n');

  // Step 1: Build ESM and UMD formats using Vite
  console.log('1. Building ES modules and UMD...');
  await build({
    configFile: path.resolve(__dirname, '../vite.config.build.js')
  });

  // Step 2: Create minified version for script tag usage (min/Ox.js)
  console.log('\n2. Creating minified build...');
  
  // Read the UMD build
  const umdPath = path.resolve(__dirname, '../dist/ox.umd.js');
  const umdCode = fs.readFileSync(umdPath, 'utf-8');
  
  // Minify with Terser
  const minified = await minify(umdCode, {
    compress: {
      drop_console: false, // Keep console for debugging
      drop_debugger: true,
      pure_funcs: ['console.log']
    },
    mangle: {
      reserved: ['Ox'] // Don't mangle the main Ox object
    },
    format: {
      comments: false,
      preamble: '/* OxJS v0.2.0 | (c) 2024 0x2620 | MIT License | oxjs.org */'
    }
  });

  // Ensure min directory exists
  const minDir = path.resolve(__dirname, '../min');
  if (!fs.existsSync(minDir)) {
    fs.mkdirSync(minDir, { recursive: true });
  }

  // Write minified file
  fs.writeFileSync(path.join(minDir, 'Ox.js'), minified.code);

  // Step 3: Copy the minified file to be compatible with old path structure
  console.log('\n3. Creating backward compatible structure...');
  
  // Create dev symlink if it doesn't exist
  const devPath = path.resolve(__dirname, '../dev');
  if (!fs.existsSync(devPath)) {
    fs.symlinkSync('source', devPath, 'dir');
  }

  // Step 4: Generate build info
  const buildInfo = {
    version: '0.2.0',
    date: new Date().toISOString(),
    files: {
      'dist/ox.esm.js': getFileSize('../dist/ox.esm.js'),
      'dist/ox.umd.js': getFileSize('../dist/ox.umd.js'),
      'min/Ox.js': getFileSize('../min/Ox.js')
    }
  };

  fs.writeFileSync(
    path.resolve(__dirname, '../dist/build-info.json'),
    JSON.stringify(buildInfo, null, 2)
  );

  console.log('\n✅ Build complete!\n');
  console.log('Generated files:');
  console.log(`  dist/ox.esm.js (${buildInfo.files['dist/ox.esm.js']})`);
  console.log(`  dist/ox.umd.js (${buildInfo.files['dist/ox.umd.js']})`);
  console.log(`  min/Ox.js (${buildInfo.files['min/Ox.js']})`);
}

function getFileSize(relativePath) {
  const filePath = path.resolve(__dirname, relativePath);
  if (fs.existsSync(filePath)) {
    const stats = fs.statSync(filePath);
    return formatBytes(stats.size);
  }
  return 'N/A';
}

function formatBytes(bytes) {
  if (bytes < 1024) return bytes + ' B';
  if (bytes < 1024 * 1024) return (bytes / 1024).toFixed(1) + ' KB';
  return (bytes / (1024 * 1024)).toFixed(1) + ' MB';
}

// Run build
buildOx().catch(error => {
  console.error('Build failed:', error);
  process.exit(1);
});