/**
 * Copyright (c) Meta Platforms, Inc. and affiliates.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 *
 * @format
 */

// We use sync access once per startup.
/* eslint-disable node/no-sync */

import path from 'path';
import fs from 'fs';
import {getFlipperServerConfig} from '../FlipperServerConfig';
import {isFBBuild} from '../fb-stubs/constants';

export function getStaticPath(
  relativePath: string = '.',
  {asarUnpacked}: {asarUnpacked: boolean} = {asarUnpacked: false},
) {
  const staticDir = getFlipperServerConfig().paths.staticPath;
  const absolutePath = path.resolve(staticDir, relativePath);
  // Unfortunately, path.resolve, fs.pathExists, fs.read etc do not automatically work with asarUnpacked files.
  // All these functions still look for files in "app.asar" even if they are unpacked.
  // Looks like automatic resolving for asarUnpacked files only work for "child_process" module.
  // So we're using a hack here to actually look to "app.asar.unpacked" dir instead of app.asar package.
  return asarUnpacked
    ? absolutePath.replace('app.asar', 'app.asar.unpacked')
    : absolutePath;
}

export async function getChangelog() {
  return (
    await fs.promises.readFile(
      path.join(getChangelogPath(), 'CHANGELOG.md'),
      'utf8',
    )
  ).trim();
}

function getChangelogPath() {
  const changelogPath = getStaticPath(isFBBuild ? 'facebook' : '.');
  if (fs.existsSync(changelogPath)) {
    return changelogPath;
  } else {
    throw new Error('Changelog path path does not exist: ' + changelogPath);
  }
}