// ide-extension-parser.mjs — Parse VS Code extension package.json into normalized manifest.
// Zero dependencies (Node.js builtins only).

import { readFile, access } from 'node:fs/promises';
import { join } from 'node:path';

async function pathExists(p) {
  try { await access(p); return true; } catch { return false; }
}

/**
 * @typedef {object} ParsedManifest
 * @property {string} id
 * @property {string} publisher
 * @property {string} name
 * @property {string} version
 * @property {object} engines
 * @property {string|null} main
 * @property {string|null} browser
 * @property {string[]} activationEvents
 * @property {object} contributes
 * @property {string[]} extensionPack
 * @property {string[]} extensionDependencies
 * @property {string[]} extensionKind
 * @property {string[]} categories
 * @property {object} capabilities
 * @property {object} scripts
 * @property {object|string|null} repository
 * @property {object} dependencies
 * @property {boolean} hasSignature
 */

/**
 * Parse a VS Code extension directory.
 * @param {string} extRoot - Absolute path to extracted extension root.
 * @returns {Promise<{ manifest: ParsedManifest, warnings: string[] } | null>}
 */
export async function parseVSCodeExtension(extRoot) {
  const warnings = [];
  const pkgPath = join(extRoot, 'package.json');
  let raw;
  try {
    raw = await readFile(pkgPath, 'utf8');
  } catch (err) {
    return null;
  }

  let pkg;
  try {
    pkg = JSON.parse(raw);
  } catch (err) {
    warnings.push(`malformed package.json at ${pkgPath}: ${err.message}`);
    return null;
  }

  if (!pkg || typeof pkg !== 'object') {
    warnings.push(`package.json at ${pkgPath} is not an object`);
    return null;
  }

  const publisher = typeof pkg.publisher === 'string' ? pkg.publisher : '';
  const name = typeof pkg.name === 'string' ? pkg.name : '';
  const version = typeof pkg.version === 'string' ? pkg.version : '';

  if (!publisher || !name) {
    warnings.push(`missing publisher/name in ${pkgPath}`);
    return null;
  }

  const hasSignature = await pathExists(join(extRoot, '.signature.p7s'));

  const manifest = {
    id: `${publisher}.${name}`.toLowerCase(),
    publisher: publisher.toLowerCase(),
    name: name.toLowerCase(),
    version,
    engines: pkg.engines && typeof pkg.engines === 'object' ? pkg.engines : {},
    main: typeof pkg.main === 'string' ? pkg.main : null,
    browser: typeof pkg.browser === 'string' ? pkg.browser : null,
    activationEvents: Array.isArray(pkg.activationEvents) ? pkg.activationEvents.filter(e => typeof e === 'string') : [],
    contributes: pkg.contributes && typeof pkg.contributes === 'object' ? pkg.contributes : {},
    extensionPack: Array.isArray(pkg.extensionPack) ? pkg.extensionPack.filter(e => typeof e === 'string') : [],
    extensionDependencies: Array.isArray(pkg.extensionDependencies) ? pkg.extensionDependencies.filter(e => typeof e === 'string') : [],
    extensionKind: Array.isArray(pkg.extensionKind) ? pkg.extensionKind.filter(e => typeof e === 'string') : [],
    categories: Array.isArray(pkg.categories) ? pkg.categories.filter(c => typeof c === 'string') : [],
    capabilities: pkg.capabilities && typeof pkg.capabilities === 'object' ? pkg.capabilities : {},
    scripts: pkg.scripts && typeof pkg.scripts === 'object' ? pkg.scripts : {},
    repository: pkg.repository || null,
    dependencies: pkg.dependencies && typeof pkg.dependencies === 'object' ? pkg.dependencies : {},
    hasSignature,
  };

  return { manifest, warnings };
}

/**
 * Parse a .vsix file. Stub for v1 — user must extract first.
 * @param {string} vsixPath
 * @throws {Error}
 */
export async function parseVsixFile(vsixPath) {
  throw new Error(`VSIX parsing not implemented in v6.3.0. Extract manually (unzip ${vsixPath}) and pass the extracted directory.`);
}

/**
 * Parse an IntelliJ plugin. Stub for v1.1.
 * @param {string} pluginRoot
 * @returns {Promise<null>}
 */
export async function parseIntelliJPlugin(pluginRoot) {
  return null;
}