/**
 * 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. Copying bundled OpenClaw runtime dependencies that electron-builder may skip
 * 4. Cleaning up unnecessary development files to reduce package size
 */

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

const ARCH_NAME_MAP = {
  0: 'ia32',
  1: 'x64',
  2: 'armv7l',
  3: 'arm64',
  4: 'universal',
};

const REQUIRED_RUNTIME_BINARIES = {
  win32: ['uv.exe', 'node.exe'],
  darwin: ['uv'],
  linux: ['uv'],
};

function normalizePackArch(arch) {
  if (typeof arch === 'string') {
    return arch;
  }

  return ARCH_NAME_MAP[arch] || String(arch);
}

function normalizePlatformName(electronPlatformName) {
  switch (electronPlatformName) {
    case 'win':
      return 'win32';
    case 'mac':
      return 'darwin';
    default:
      return electronPlatformName;
  }
}

function resolveBundledRuntimeTarget(context) {
  const platform = normalizePlatformName(context.electronPlatformName);
  const arch = normalizePackArch(context.arch);
  return `${platform}-${arch}`;
}

async function copyBundledRuntimeBinaries(context, overrides = {}) {
  const target = resolveBundledRuntimeTarget(context);
  const platform = normalizePlatformName(context.electronPlatformName);
  const sourceRoot = overrides.sourceRoot || path.join(__dirname, '..', 'resources', 'bin', target);
  const resourcesDir = overrides.resourcesDir || resolveResourcesDir(context);
  const destRoot = overrides.destRoot || path.join(resourcesDir, 'bin');
  const requiredFiles = overrides.requiredFiles || REQUIRED_RUNTIME_BINARIES[platform] || [];

  if (!(await fs.pathExists(sourceRoot))) {
    throw new Error(
      `[after-pack] Missing bundled runtime directory for ${target}: ${sourceRoot}. ` +
      `Run the bundled runtime preparation step before packaging.`,
    );
  }

  await fs.ensureDir(destRoot);

  const entries = await fs.readdir(sourceRoot, { withFileTypes: true });
  for (const entry of entries) {
    if (!entry.isFile()) {
      continue;
    }

    await fs.copy(path.join(sourceRoot, entry.name), path.join(destRoot, entry.name), {
      overwrite: true,
    });
  }

  const missing = requiredFiles.filter((fileName) => !fs.existsSync(path.join(destRoot, fileName)));
  if (missing.length > 0) {
    throw new Error(
      `[after-pack] Missing required bundled runtime binaries for ${target}: ${missing.join(', ')}.`,
    );
  }

  console.log(`[after-pack] Copied bundled runtime binaries for ${target} -> ${destRoot}`);
}

/**
 * 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;
}

function resolveResourcesDir(context) {
  if (context.electronPlatformName === 'darwin') {
    if (context.appOutDir.endsWith('.app')) {
      return path.join(context.appOutDir, 'Contents', 'Resources');
    }

    const appName = context.packager?.appInfo?.productFilename || 'NIANXX';
    return path.join(context.appOutDir, `${appName}.app`, 'Contents', 'Resources');
  }

  return path.join(context.appOutDir, 'resources');
}

async function copyBundledOpenClaw(context) {
  const srcRoot = path.join(__dirname, '..', 'build', 'openclaw');
  if (!(await fs.pathExists(srcRoot))) {
    console.warn('[after-pack] build/openclaw not found. Run bundle-openclaw first.');
    return;
  }

  const resourcesDir = resolveResourcesDir(context);
  const destRoot = path.join(resourcesDir, 'openclaw');
  const srcNodeModules = path.join(srcRoot, 'node_modules');
  const destNodeModules = path.join(destRoot, 'node_modules');

  await fs.ensureDir(resourcesDir);

  if (!(await fs.pathExists(destRoot))) {
    await fs.copy(srcRoot, destRoot, {
      filter: (src) => {
        const relative = path.relative(srcRoot, src);
        if (!relative) return true;
        return relative.split(path.sep)[0] !== 'node_modules';
      },
    });
    console.log('[after-pack] Copied bundled OpenClaw runtime root.');
  }

  if (!(await fs.pathExists(srcNodeModules))) {
    console.warn('[after-pack] build/openclaw/node_modules not found. OpenClaw runtime will be incomplete.');
    return;
  }

  if (!(await fs.pathExists(destNodeModules))) {
    await fs.copy(srcNodeModules, destNodeModules);
    console.log('[after-pack] Copied bundled OpenClaw node_modules.');
  }
}

module.exports = async function afterPack(context) {
  const { appOutDir, electronPlatformName: platform, arch } = context;
  const resourcesDir = resolveResourcesDir(context);
  
  console.log(`Running afterPack hook for ${platform}-${arch}`);
  console.log(`App output directory: ${appOutDir}`);

  await copyBundledRuntimeBinaries(context, { resourcesDir });
  
  // 1. Handle electron/scripts/ directory
  const scriptsSrc = path.join(__dirname, '..', 'electron/scripts');
  const scriptsDest = path.join(resourcesDir, '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}`);
      }
    }
  }

  await copyBundledOpenClaw(context);
  
  // 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(resourcesDir, '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(resourcesDir, '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');
};

module.exports.__test__ = {
  normalizePackArch,
  normalizePlatformName,
  resolveBundledRuntimeTarget,
  copyBundledRuntimeBinaries,
};