/**
 * NDK Browser Bundle Builder
 *
 * Creates a browser-compatible IIFE bundle of NDK with:
 * - Core NDK functionality
 * - Browser cache
 * - SQLite WASM cache
 * - Sessions
 * - Messages
 * - Web of Trust (WoT)
 * - Blossom
 * - Uses the existing window.NostrTools from nostr.bundle.js
 * - Exposes NDK as window.NDK
 */

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

async function buildNDKBundle() {
  console.log('🔧 Building NDK browser bundle with additional packages...');
  console.log('📦 Including: core, wallet, cache-browser, cache-dexie, cache-sqlite-wasm, sessions, messages, wot, blossom');
  
  const __dirname = path.resolve();
  
  // Create a virtual entry point that imports all packages using absolute paths
  const entryContent = `
// Import the default NDK class
import NDK from '${path.join(__dirname, 'ndk/core/src/index.ts')}';

// Import default exports from cache packages
import NDKCacheBrowser from '${path.join(__dirname, 'ndk/cache-browser/src/index.ts')}';
import NDKCacheAdapterDexie from '${path.join(__dirname, 'ndk/cache-dexie/src/index.ts')}';
import NDKCacheAdapterSqliteWasm from '${path.join(__dirname, 'ndk/cache-sqlite-wasm/src/index.ts')}';

import { CashuMint, CashuWallet, getDecodedToken, getEncodedTokenV4 } from '${path.join(__dirname, 'ndk/node_modules/@cashu/cashu-ts/lib/cashu-ts.es.js')}';

// Re-export everything as named exports
export * from '${path.join(__dirname, 'ndk/core/src/index.ts')}';
export * from '${path.join(__dirname, 'ndk/cache-browser/src/index.ts')}';
export * from '${path.join(__dirname, 'ndk/cache-dexie/src/index.ts')}';
export * from '${path.join(__dirname, 'ndk/cache-sqlite-wasm/src/index.ts')}';
export * from '${path.join(__dirname, 'ndk/sessions/src/index.ts')}';
export * from '${path.join(__dirname, 'ndk/messages/src/index.ts')}';
export * from '${path.join(__dirname, 'ndk/wot/src/index.ts')}';
export * from '${path.join(__dirname, 'ndk/blossom/src/index.ts')}';
export * from '${path.join(__dirname, 'ndk/wallet/src/index.ts')}';

// Re-export default exports as named exports
export {
  NDKCacheBrowser,
  NDKCacheAdapterDexie,
  NDKCacheAdapterSqliteWasm,
  CashuMint,
  CashuWallet,
  getDecodedToken,
  getEncodedTokenV4
};

// Export the main NDK class as default
export default NDK;
`;

  // Write the virtual entry point
  const entryPath = path.join(__dirname, 'build/ndk-entry.js');
  fs.mkdirSync('build', { recursive: true });
  fs.writeFileSync(entryPath, entryContent);
  
  try {
    const result = await esbuild.build({
      entryPoints: [entryPath],
      bundle: true,
      format: 'iife',
      globalName: 'NDK',
      outfile: 'build/ndk-core.bundle.js',
      platform: 'browser',
      target: 'es2020',
      minify: false, // Set to true for production
      sourcemap: true,
      metafile: true, // Enable metafile for analysis
      
      // Plugin to map nostr-tools imports to window.NostrTools
      plugins: [{
        name: 'nostr-tools-external',
        setup(build) {
          // Intercept all nostr-tools imports (including subpaths like nostr-tools/nip49)
          build.onResolve({ filter: /^nostr-tools/ }, args => {
            return {
              path: args.path,
              namespace: 'nostr-tools-external'
            };
          });
          
          // Replace with window.NostrTools reference
          build.onLoad({ filter: /.*/, namespace: 'nostr-tools-external' }, (args) => {
            // Extract subpath if present (e.g., "nostr-tools/nip49" -> "nip49")
            const subpath = args.path.replace(/^nostr-tools\/?/, '');
            
            return {
              contents: `
                // Map nostr-tools to window.NostrTools
                if (typeof window === 'undefined' || !window.NostrTools) {
                  throw new Error('NDK: nostr.bundle.js must be loaded before ndk-core.bundle.js');
                }
                ${subpath ? `
                // Access subpath: ${subpath}
                if (!window.NostrTools.${subpath}) {
                  console.warn('nostr-tools/${subpath} not found in window.NostrTools');
                  module.exports = {};
                } else {
                  module.exports = window.NostrTools.${subpath};
                }
                ` : `
                module.exports = window.NostrTools;
                `}
              `,
              loader: 'js'
            };
          });
        }
      }],
      
      // Define environment variables for browser
      define: {
        'process.env.NODE_ENV': '"production"',
        'global': 'window'
      },
      
      // Banner to add at the top of the bundle
      banner: {
        js: `/**
 * NDK (Nostr Development Kit) - Browser Bundle
 * Version: 3.0.0-beta.64
 * 
 * IMPORTANT: This bundle requires nostr.bundle.js to be loaded first!
 * 
 * Usage:
 *   <script src="nostr.bundle.js"></script>
 *   <script src="ndk-core.bundle.js"></script>
 * 
 * Then access via: window.NDK
 * 
 * Generated: ${new Date().toISOString()}
 */
`
      }
    });
    
    // Save metafile for analysis
    fs.writeFileSync('build/meta.json', JSON.stringify(result.metafile, null, 2));
    
    const stats = fs.statSync('build/ndk-core.bundle.js');
    const sizeKB = (stats.size / 1024).toFixed(2);
    
    console.log('✅ NDK bundle created successfully!');
    console.log(`📏 Bundle size: ${sizeKB} KB`);
    console.log('📄 Output: build/ndk-core.bundle.js');
    console.log('📄 Source map: build/ndk-core.bundle.js.map');
    console.log('');
    
    // Analyze bundle composition
    console.log('📊 Bundle Composition Analysis:');
    console.log('');
    
    const inputs = result.metafile.inputs;
    const packageSizes = {};
    
    for (const [file, info] of Object.entries(inputs)) {
      let packageName = 'other';
      
      if (file.includes('ndk/core/')) packageName = 'core';
      else if (file.includes('ndk/cache-browser/')) packageName = 'cache-browser';
      else if (file.includes('ndk/cache-dexie/')) packageName = 'cache-dexie';
      else if (file.includes('ndk/cache-sqlite-wasm/')) packageName = 'cache-sqlite-wasm';
      else if (file.includes('ndk/sessions/')) packageName = 'sessions';
      else if (file.includes('ndk/messages/')) packageName = 'messages';
      else if (file.includes('ndk/wot/')) packageName = 'wot';
      else if (file.includes('ndk/blossom/')) packageName = 'blossom';
      else if (file.includes('node_modules/@noble/')) packageName = 'noble-crypto';
      else if (file.includes('node_modules/')) packageName = 'dependencies';
      
      if (!packageSizes[packageName]) packageSizes[packageName] = 0;
      packageSizes[packageName] += info.bytes;
    }
    
    // Sort by size
    const sorted = Object.entries(packageSizes)
      .sort((a, b) => b[1] - a[1])
      .map(([name, bytes]) => ({
        name,
        kb: (bytes / 1024).toFixed(2),
        percent: ((bytes / stats.size) * 100).toFixed(1)
      }));
    
    for (const item of sorted) {
      const bar = '█'.repeat(Math.floor(item.percent / 2));
      console.log(`  ${item.name.padEnd(20)} ${item.kb.padStart(8)} KB  ${item.percent.padStart(5)}%  ${bar}`);
    }
    
    console.log('');
    console.log('📋 Usage:');
    console.log('  1. Load nostr.bundle.js first');
    console.log('  2. Load ndk-core.bundle.js second');
    console.log('  3. Access via window.NDK');
    
  } catch (error) {
    console.error('❌ Build failed:', error);
    process.exit(1);
  }
}

// Run the build
buildNDKBundle();