'use strict';

const {existsSync, readdirSync, unlinkSync} = require('fs');
const Bundles = require('./bundles');
const {
  asyncCopyTo,
  asyncExecuteCommand,
  asyncExtractTar,
  asyncRimRaf,
} = require('./utils');

const {
  UMD_DEV,
  UMD_PROD,
  NODE_DEV,
  NODE_PROD,
  FB_WWW_DEV,
  FB_WWW_PROD,
  RN_OSS_DEV,
  RN_OSS_PROD,
  RN_FB_DEV,
  RN_FB_PROD,
} = Bundles.bundleTypes;

function getPackageName(name) {
  if (name.indexOf('/') !== -1) {
    return name.split('/')[0];
  }
  return name;
}

function getBundleOutputPaths(bundleType, filename, packageName) {
  switch (bundleType) {
    case NODE_DEV:
    case NODE_PROD:
      return [`build/node_modules/${packageName}/cjs/${filename}`];
    case UMD_DEV:
    case UMD_PROD:
      return [
        `build/node_modules/${packageName}/umd/${filename}`,
        `build/dist/${filename}`,
      ];
    case FB_WWW_DEV:
    case FB_WWW_PROD:
      return [`build/facebook-www/${filename}`];
    case RN_OSS_DEV:
    case RN_OSS_PROD:
      switch (packageName) {
        case 'react-native-renderer':
          return [`build/react-native/oss/${filename}`];
        default:
          throw new Error('Unknown RN package.');
      }
    case RN_FB_DEV:
    case RN_FB_PROD:
      switch (packageName) {
        case 'react-native-renderer':
          return [`build/react-native/fb/${filename}`];
        default:
          throw new Error('Unknown RN package.');
      }
    default:
      throw new Error('Unknown bundle type.');
  }
}

async function copyWWWShims() {
  await asyncCopyTo(
    `${__dirname}/shims/facebook-www`,
    'build/facebook-www/shims'
  );
}

async function copyRNShims() {
  await Promise.all([
    // React Native
    asyncCopyTo(`${__dirname}/shims/react-native`, 'build/react-native/shims'),
    asyncCopyTo(
      require.resolve('shared/ReactTypes.js'),
      'build/react-native/shims/ReactTypes.js'
    ),
    asyncCopyTo(
      require.resolve('react-native-renderer/src/ReactNativeTypes.js'),
      'build/react-native/shims/ReactNativeTypes.js'
    ),
    asyncCopyTo(`${__dirname}/shims/react-native-fb`, 'build/react-native/fb'),
  ]);
}

async function copyAllShims() {
  await Promise.all([copyWWWShims(), copyRNShims()]);
}

function getTarOptions(tgzName, packageName) {
  // Files inside the `npm pack`ed archive start
  // with "package/" in their paths. We'll undo
  // this during extraction.
  const CONTENTS_FOLDER = 'package';
  return {
    src: tgzName,
    dest: `build/node_modules/${packageName}`,
    tar: {
      entries: [CONTENTS_FOLDER],
      map(header) {
        if (header.name.indexOf(CONTENTS_FOLDER + '/') === 0) {
          header.name = header.name.substring(CONTENTS_FOLDER.length + 1);
        }
      },
    },
  };
}

async function prepareNpmPackage(name) {
  await Promise.all([
    asyncCopyTo('LICENSE', `build/node_modules/${name}/LICENSE`),
    asyncCopyTo(
      `packages/${name}/package.json`,
      `build/node_modules/${name}/package.json`
    ),
    asyncCopyTo(
      `packages/${name}/README.md`,
      `build/node_modules/${name}/README.md`
    ),
    asyncCopyTo(`packages/${name}/npm`, `build/node_modules/${name}`),
  ]);
  const tgzName = (await asyncExecuteCommand(
    `npm pack build/node_modules/${name}`
  )).trim();
  await asyncRimRaf(`build/node_modules/${name}`);
  await asyncExtractTar(getTarOptions(tgzName, name));
  unlinkSync(tgzName);
}

async function prepareNpmPackages() {
  if (!existsSync('build/node_modules')) {
    // We didn't build any npm packages.
    return;
  }
  const builtPackageFolders = readdirSync('build/node_modules').filter(
    dir => dir.charAt(0) !== '.'
  );
  await Promise.all(builtPackageFolders.map(prepareNpmPackage));
}

module.exports = {
  copyAllShims,
  getPackageName,
  getBundleOutputPaths,
  prepareNpmPackages,
};
