/**
 * after-pack.cjs
 *
 * electron-builder afterPack hook for zn-ai
 *
 * This hook runs AFTER electron-builder finishes packing.
 * It handles:
 * 1. Copying and bundling electron/scripts/ directory
 * 2. Ensuring required dependencies (playwright, chromium-bidi, bytenode) are included
 * 3. Cleaning up unnecessary development files to reduce package size
 */

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

/**
 * Remove development artifacts from a directory (recursive).
 * Removes: test directories, TypeScript definitions, source maps, docs, etc.
 */
function cleanupUnnecessaryFiles(dir) {
  let removedCount = 0;

  const REMOVE_DIRS = new Set([
    'test', 'tests', '__tests__', '.github', 'docs', 'examples', 'example',
  ]);
  const REMOVE_FILE_EXTS = ['.d.ts', '.d.ts.map', '.js.map', '.mjs.map', '.ts.map', '.markdown'];
  const REMOVE_FILE_NAMES = new Set([
    '.DS_Store', 'README.md', 'CHANGELOG.md', 'LICENSE.md', 'CONTRIBUTING.md',
    'tsconfig.json', '.npmignore', '.eslintrc', '.prettierrc', '.editorconfig',
  ]);

  function walk(currentDir) {
    let entries;
    try {
      entries = fs.readdirSync(currentDir, { withFileTypes: true });
    } catch {
      return;
    }

    for (const entry of entries) {
      const fullPath = path.join(currentDir, entry.name);

      if (entry.isDirectory()) {
        if (REMOVE_DIRS.has(entry.name)) {
          try {
            fs.rmSync(fullPath, { recursive: true, force: true });
            removedCount++;
          } catch { /* ignore */ }
        } else {
          walk(fullPath);
        }
      } else if (entry.isFile()) {
        const name = entry.name;
        if (REMOVE_FILE_NAMES.has(name) || REMOVE_FILE_EXTS.some(e => name.endsWith(e))) {
          try {
            fs.rmSync(fullPath, { force: true });
            removedCount++;
          } catch { /* ignore */ }
        }
      }
    }
  }

  walk(dir);
  return removedCount;
}

/**
 * Clean up platform-specific native packages (optional).
 * Currently not needed for zn-ai, but kept as a placeholder.
 */
function cleanupNativePlatformPackages(nodeModulesDir, platform, arch) {
  // No platform-specific native packages identified for zn-ai yet
  return 0;
}

module.exports = async function afterPack(context) {
  const { appOutDir, electronPlatformName: platform, arch } = context;
  
  console.log(`Running afterPack hook for ${platform}-${arch}`);
  console.log(`App output directory: ${appOutDir}`);
  
  // 1. Handle electron/scripts/ directory
  const scriptsSrc = path.join(__dirname, '..', 'electron/scripts');
  const scriptsDest = path.join(appOutDir, 'resources', 'scripts');
  
  if (await fs.pathExists(scriptsSrc)) {
    await fs.ensureDir(scriptsDest);
    const files = await fs.readdir(scriptsSrc);
    
    for (const file of files) {
      const srcFile = path.join(scriptsSrc, file);
      const destFile = path.join(scriptsDest, file);
      
      if (file.endsWith('.js')) {
        // Bundle JavaScript files with esbuild
        try {
          await esbuild.build({
            entryPoints: [srcFile],
            outfile: destFile,
            bundle: true,
            platform: 'node',
            target: 'node24', // Adjust based on Electron version
            external: ['electron'], // Exclude electron from bundling
            format: 'cjs',
          });
          console.log(`Bundled: ${file}`);
        } catch (error) {
          console.error(`Failed to bundle ${file}:`, error);
          // Fallback to copying the file
          await fs.copy(srcFile, destFile);
        }
      } else {
        // Copy other files as-is
        await fs.copy(srcFile, destFile);
        console.log(`Copied: ${file}`);
      }
    }
  }
  
  // 2. Ensure required dependencies are included
  // electron-builder may exclude some dependencies due to .gitignore rules
  
  const ensureDependency = async (depName) => {
    const src = path.join(__dirname, '..', 'node_modules', depName);
    const dest = path.join(appOutDir, 'node_modules', depName);
    
    if (await fs.pathExists(src)) {
      await fs.ensureDir(path.dirname(dest));
      if (!(await fs.pathExists(dest))) {
        await fs.copy(src, dest);
        console.log(`Copied dependency: ${depName}`);
      }
    }
  };
  
  // List of dependencies that need to be explicitly copied
  const requiredDeps = ['playwright', 'playwright-core', 'chromium-bidi', 'bytenode'];
  
  for (const dep of requiredDeps) {
    await ensureDependency(dep);
  }

  // 3. Clean up unnecessary development files from node_modules (skip if SKIP_AFTERPACK_CLEANUP is set)
  if (!process.env.SKIP_AFTERPACK_CLEANUP) {
    const nodeModulesDest = path.join(appOutDir, 'node_modules');
    if (await fs.pathExists(nodeModulesDest)) {
      console.log('Cleaning up development files in node_modules...');
      const removed = cleanupUnnecessaryFiles(nodeModulesDest);
      console.log(`Removed ${removed} unnecessary files/directories from node_modules.`);
    }

    // 4. Clean up unnecessary files in scripts directory
    if (await fs.pathExists(scriptsDest)) {
      console.log('Cleaning up development files in scripts directory...');
      const removedScripts = cleanupUnnecessaryFiles(scriptsDest);
      console.log(`Removed ${removedScripts} unnecessary files/directories from scripts.`);
    }
  } else {
    console.log('Skipping afterPack cleanup (SKIP_AFTERPACK_CLEANUP is set)');
  }

  // 5. Optional: platform-specific native package cleanup
  // cleanupNativePlatformPackages(nodeModulesDest, platform, arch);
  
  console.log('afterPack hook completed successfully');
};