/**
 * 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
 */

// @ts-ignore
import Metro from 'metro';
// provided by Metro
// @ts-ignore
// eslint-disable-next-line
import MetroResolver from 'metro-resolver';
import tmp from 'tmp';
import path from 'path';
import fs from 'fs-extra';
import {spawn, exec} from 'promisify-child-process';
import {
  buildDefaultPlugins,
  getDefaultPlugins,
  getWatchFolders,
  stripSourceMapComment,
} from 'flipper-pkg-lib';
import getAppWatchFolders from './get-app-watch-folders';
import {getPluginSourceFolders} from 'flipper-plugin-lib';
import {
  appDir,
  staticDir,
  defaultPluginsDir,
  babelTransformationsDir,
  serverDir,
  rootDir,
  browserUiDir,
} from './paths';
import pFilter from 'p-filter';
import child from 'child_process';
import isFB from './isFB';

const dev = process.env.NODE_ENV !== 'production';

export function die(err: Error) {
  console.error('Script termnated.', err);
  process.exit(1);
}

export async function prepareDefaultPlugins(isInsidersBuild: boolean = false) {
  console.log(
    `⚙️  Preparing default plugins (isInsidersBuild=${isInsidersBuild})...`,
  );
  await fs.emptyDir(defaultPluginsDir);
  const forcedDefaultPluginsDir = process.env.FLIPPER_DEFAULT_PLUGINS_DIR;
  if (forcedDefaultPluginsDir) {
    // Used for internal builds. Sandcastle downloads plugins from the marketplace to preserve their versions if they are not updated.
    console.log(
      `⚙️  Copying the provided default plugins dir "${forcedDefaultPluginsDir}"...`,
    );
    await fs.copy(forcedDefaultPluginsDir, defaultPluginsDir, {
      overwrite: true,
      dereference: true,
    });
    console.log('✅  Copied the provided default plugins dir.');
  } else {
    const defaultPlugins = await getDefaultPlugins(isInsidersBuild);
    await buildDefaultPlugins(
      defaultPlugins,
      dev,
      isFB && !process.env.FLIPPER_FORCE_PUBLIC_BUILD,
    );
  }
  console.log('✅  Prepared default plugins.');
}

const minifierConfig = {
  minifierPath: require.resolve('metro-minify-terser'),
  minifierConfig: {
    // see: https://www.npmjs.com/package/terser
    keep_fnames: true,
    module: true,
    warnings: true,
    mangle: false,
    compress: false,
  },
};

async function compile(
  buildFolder: string,
  projectRoot: string,
  watchFolders: string[],
  entry: string,
) {
  const out = path.join(buildFolder, 'bundle.js');
  await Metro.runBuild(
    {
      reporter: {update: () => {}},
      projectRoot,
      watchFolders,
      serializer: {},
      transformer: {
        babelTransformerPath: path.join(
          babelTransformationsDir,
          'transform-app',
        ),
        ...minifierConfig,
      },
      resolver: {
        resolverMainFields: ['flipperBundlerEntry', 'module', 'main'],
        blacklistRE: /\.native\.js$/,
        sourceExts: ['js', 'jsx', 'ts', 'tsx', 'json', 'mjs', 'cjs'],
      },
    },
    {
      dev,
      minify: !dev,
      resetCache: !dev,
      sourceMap: true,
      sourceMapUrl: dev ? 'bundle.map' : undefined,
      inlineSourceMap: false,
      entry,
      out,
    },
  );
  if (!dev) {
    await stripSourceMapComment(out);
  }
}

export async function compileRenderer(buildFolder: string) {
  console.log(`⚙️  Compiling renderer bundle...`);
  const watchFolders = [
    ...(await getAppWatchFolders()),
    ...(await getPluginSourceFolders()),
  ];
  try {
    await compile(
      buildFolder,
      appDir,
      watchFolders,
      path.join(appDir, 'src', 'init.tsx'),
    );
    console.log('✅  Compiled renderer bundle.');
  } catch (err) {
    die(err);
  }
}

export async function moveSourceMaps(
  buildFolder: string,
  sourceMapFolder: string | undefined,
) {
  console.log(`⚙️  Moving source maps...`);
  const mainBundleMap = path.join(buildFolder, 'bundle.map');
  const rendererBundleMap = path.join(staticDir, 'main.bundle.map');
  if (sourceMapFolder) {
    await fs.ensureDir(sourceMapFolder);
    await fs.move(mainBundleMap, path.join(sourceMapFolder, 'bundle.map'), {
      overwrite: true,
    });
    await fs.move(
      rendererBundleMap,
      path.join(sourceMapFolder, 'main.bundle.map'),
      {overwrite: true},
    );
    console.log(`✅  Moved to ${sourceMapFolder}.`);
  } else {
    // If we don't move them out of the build folders, they'll get included in the ASAR
    // which we don't want.
    console.log(`⏭  Removing source maps.`);
    await Promise.all([fs.remove(mainBundleMap), fs.remove(rendererBundleMap)]);
  }
}

export async function moveServerSourceMaps(
  buildFolder: string,
  sourceMapFolder: string | undefined,
) {
  console.log(`⚙️  Moving server source maps...`);
  const rendererBundleMap = path.join(buildFolder, 'static', 'bundle.map');
  if (sourceMapFolder) {
    await fs.ensureDir(sourceMapFolder);
    // TODO: Remove me
    // Create an empty file not satisfy Sandcastle. Remove it once Sandcastle no longer requires the file
    await fs.writeFile(path.join(sourceMapFolder, 'bundle.map'), '{}');
    await fs.move(
      rendererBundleMap,
      path.join(sourceMapFolder, 'main.bundle.map'),
      {overwrite: true},
    );
    console.log(`✅  Moved to ${sourceMapFolder}.`);
  } else {
    // Removing so we don't bundle them up as part of the release.
    console.log(`⏭  Removing source maps.`);
    await fs.remove(rendererBundleMap);
  }
}

export async function compileMain() {
  const out = path.join(staticDir, 'main.bundle.js');
  process.env.FLIPPER_ELECTRON_VERSION =
    require('electron/package.json').version;
  console.log('⚙️  Compiling main bundle...');
  try {
    const config = Object.assign({}, await Metro.loadConfig(), {
      reporter: {update: () => {}},
      projectRoot: staticDir,
      watchFolders: await getWatchFolders(staticDir),
      transformer: {
        babelTransformerPath: path.join(
          babelTransformationsDir,
          'transform-main',
        ),
        ...minifierConfig,
      },
      resolver: {
        sourceExts: ['tsx', 'ts', 'js'],
        resolverMainFields: ['flipperBundlerEntry', 'module', 'main'],
        blacklistRE: /\.native\.js$/,
      },
    });
    await Metro.runBuild(config, {
      platform: 'web',
      entry: path.join(staticDir, 'main.tsx'),
      out,
      dev,
      minify: !dev,
      sourceMap: true,
      sourceMapUrl: dev ? 'main.bundle.map' : undefined,
      inlineSourceMap: false,
      resetCache: !dev,
    });
    console.log('✅  Compiled main bundle.');
    if (!dev) {
      await stripSourceMapComment(out);
    }
  } catch (err) {
    die(err);
  }
}
export function buildFolder(
  prefix: string = 'flipper-build-',
): Promise<string> {
  // eslint-disable-next-line no-console
  console.log('Creating build directory');
  return new Promise<string>((resolve, reject) => {
    tmp.dir({prefix}, (err, buildFolder) => {
      if (err) {
        reject(err);
      } else {
        resolve(buildFolder);
      }
    });
  }).catch((e) => {
    die(e);
    return '';
  });
}
export function getVersionNumber(buildNumber?: number) {
  // eslint-disable-next-line flipper/no-relative-imports-across-packages
  let {version} = require('../package.json');
  if (buildNumber) {
    // Unique build number is passed as --version parameter from Sandcastle
    version = [...version.split('.').slice(0, 2), buildNumber].join('.');
  }
  return version;
}

// Asynchronously determine current mercurial revision as string or `null` in case of any error.
export function genMercurialRevision(): Promise<string | null> {
  return spawn('hg', ['log', '-r', '.', '-T', '{node}'], {encoding: 'utf8'})
    .then(
      (res) =>
        (res &&
          (typeof res.stdout === 'string'
            ? res.stdout
            : res.stdout?.toString())) ||
        null,
    )
    .catch(() => null);
}

export async function compileServerMain(dev: boolean) {
  console.log('⚙️  Compiling server sources...');
  await exec(`cd ${serverDir} && yarn build`);
  console.log('✅  Compiled server sources.');
}

// TODO: needed?
const uiSourceDirs = [
  'flipper-ui-browser',
  'flipper-ui-core',
  'flipper-plugin',
  'flipper-common',
];

export async function buildBrowserBundle(outDir: string, dev: boolean) {
  console.log('⚙️  Compiling browser bundle...');
  const out = path.join(outDir, 'bundle.js');

  const electronRequires = path.join(
    babelTransformationsDir,
    'electron-requires',
  );
  const stubModules = new Set<string>(require(electronRequires).BUILTINS);
  if (!stubModules.size) {
    throw new Error('Failed to load list of Node builtins');
  }

  const watchFolders = await dedupeFolders([
    ...(
      await Promise.all(
        uiSourceDirs.map((dir) => getWatchFolders(path.resolve(rootDir, dir))),
      )
    ).flat(),
    ...(await getPluginSourceFolders()),
  ]);

  const baseConfig = await Metro.loadConfig();
  const config = Object.assign({}, baseConfig, {
    projectRoot: browserUiDir,
    watchFolders,
    transformer: {
      ...baseConfig.transformer,
      babelTransformerPath: path.join(
        babelTransformationsDir,
        'transform-browser',
      ),
      ...(!dev ? minifierConfig : undefined),
    },
    resolver: {
      ...baseConfig.resolver,
      resolverMainFields: ['flipperBundlerEntry', 'browser', 'module', 'main'],
      blacklistRE: [/\.native\.js$/],
      sourceExts: ['js', 'jsx', 'ts', 'tsx', 'json', 'mjs', 'cjs'],
      resolveRequest(context: any, moduleName: string, ...rest: any[]) {
        assertSaneImport(context, moduleName);
        // flipper is special cased, for plugins that we bundle,
        // we want to resolve `import from 'flipper'` to 'flipper-ui-core', which
        // defines all the deprecated exports
        if (moduleName === 'flipper') {
          return MetroResolver.resolve(context, 'flipper-ui-core', ...rest);
        }
        // stubbed modules are modules that don't make sense outside a Node / Electron context,
        // like fs, child_process etc etc.
        // UI / plugins using these features should use the corresponding RenderHost api's instead
        // Ideally we'd fail hard on those, but not all plugins are properly converted yet, and some
        // libraries try to require them for feature detection (e.g. jsbase64)
        if (stubModules.has(moduleName)) {
          console.warn(
            `Found a reference to built-in module '${moduleName}', which will be stubbed out. Referer: ${context.originModulePath}`,
          );
          return {
            type: 'empty',
          };
        }
        return defaultResolve(context, moduleName, ...rest);
      },
    },
  });
  await Metro.runBuild(config, {
    platform: 'web',
    entry: path.join(browserUiDir, 'src', 'index.tsx'),
    out,
    dev,
    minify: !dev,
    sourceMap: true,
    sourceMapUrl: dev ? 'index.map' : undefined,
    inlineSourceMap: false,
  });
  console.log('✅  Compiled browser bundle.');
}

async function dedupeFolders(paths: string[]): Promise<string[]> {
  return pFilter(
    paths.filter((value, index, self) => self.indexOf(value) === index),
    (f) => fs.pathExists(f),
  );
}

export function sleep(ms: number) {
  return new Promise((r) => setTimeout(r, ms));
}

let proc: child.ChildProcess | undefined;

export async function launchServer(startBundler: boolean, open: boolean) {
  if (proc) {
    console.log('⚙️  Killing old flipper-server...');
    proc.kill(9);
  }
  console.log('⚙️  Launching flipper-server...');
  proc = child.spawn(
    'node',
    [
      '--inspect=9229',
      `../flipper-server/server.js`,
      startBundler ? `--bundler` : `--no-bundler`,
      open ? `--open` : `--no-open`,
    ],
    {
      cwd: serverDir,
      env: {
        ...process.env,
      },
      stdio: 'inherit',
    },
  );
}

function assertSaneImport(context: any, moduleName: string) {
  // This function checks that we aren't accidentally bundling up something huge we don't want to
  // bundle up
  if (
    moduleName.startsWith('jest') ||
    (moduleName.startsWith('metro') &&
      !moduleName.startsWith('metro-runtime')) ||
    moduleName === 'Metro' ||
    (moduleName.startsWith('babel') &&
      !moduleName.startsWith('babel-runtime')) ||
    moduleName.startsWith('typescript') ||
    moduleName.startsWith('electron') ||
    moduleName.startsWith('@testing-library')
  ) {
    console.error(
      `Found a reference to module '${moduleName}', which should not be imported / required. Referer: ${context.originModulePath}`,
    );
    // throwing errors doesn't really stop Metro :-/
    process.exit(1);
  }
}

function defaultResolve(...rest: any[]) {
  const [context, moduleName] = rest;
  return MetroResolver.resolve(
    {
      ...context,
      resolveRequest: null,
    },
    moduleName,
    ...rest,
  );
}