/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this file,
 * You can obtain one at http://mozilla.org/MPL/2.0/. */

const path = require("path");
const webpack = require("webpack");
const TerserPlugin = require("terser-webpack-plugin");
const { ResourceUriPlugin } = require("../../tools/resourceUriPlugin");
const { MozSrcUriPlugin } = require("../../tools/mozsrcUriPlugin");

const absolute = relPath => path.join(__dirname, relPath);

const baseConfig = env => ({
  mode: "none",
  devtool: env.development ? "inline-source-map" : false,
  module: {
    rules: [
      {
        test: /\.jsx?$/,
        exclude: /node_modules\/(?!@fluent\/).*/,
        loader: "babel-loader",
        options: {
          presets: ["@babel/preset-react"],
        },
      },
      {
        // webpack 5 enforces fully-specified paths for ESM imports; disable for
        // .mjs so that bare specifiers like "react-dom/server.browser" resolve.
        test: /\.mjs$/,
        resolve: { fullySpecified: false },
      },
    ],
  },
  resolve: {
    extensions: [".js", ".jsx", ".mjs"],
    modules: ["node_modules", "."],
  },
});

const vendorOptimization = {
  minimize: true,
  minimizer: [
    new TerserPlugin({
      extractComments: false,
      terserOptions: {
        format: {
          comments: /THIS FILE IS AUTO-GENERATED/,
        },
      },
    }),
  ],
};

module.exports = (env = {}) => [
  // Vendor bundle with React
  Object.assign({}, baseConfig(env), {
    name: "vendor",
    entry: absolute("content-src/vendor.mjs"),
    output: {
      path: absolute("data/content"),
      filename: "vendor.bundle.js",
    },
    devtool: false,
    optimization: vendorOptimization,
    plugins: [
      new webpack.DefinePlugin({
        "process.env.NODE_ENV": JSON.stringify(
          env.development ? "development" : "production"
        ),
      }),
      new webpack.BannerPlugin(
        `THIS FILE IS AUTO-GENERATED: ${path.basename(__filename)}`
      ),
    ],
  }),
  // Activity stream bundle (uses vendor as externals)
  Object.assign({}, baseConfig(env), {
    name: "activity-stream",
    entry: absolute("content-src/activity-stream.jsx"),
    output: {
      path: absolute("data/content"),
      filename: "activity-stream.bundle.js",
      library: {
        name: "NewtabRenderUtils",
        type: "var",
      },
    },
    externalsType: "window",
    externals: {
      react: "React",
      "react-dom": "ReactDOM",
      "react-dom/client": {
        root: "ReactDOM",
        commonjs: "react-dom/client",
        commonjs2: "react-dom/client",
      },
      "react-dom/server.browser": {
        root: "ReactDOMServer",
        commonjs: "react-dom/server.browser",
        commonjs2: "react-dom/server.browser",
      },
      "prop-types": "PropTypes",
      "react-transition-group": "ReactTransitionGroup",
      "react-redux": "ReactRedux",
      redux: "Redux",
    },
    plugins: [
      new webpack.DefinePlugin({
        "process.env.NODE_ENV": JSON.stringify(
          env.development ? "development" : "production"
        ),
      }),
      new ResourceUriPlugin({
        resourcePathRegExes: [
          [new RegExp("^resource://newtab/"), path.join(__dirname, "./")],
          [
            new RegExp("^resource:///modules/topsites/"),
            path.join(__dirname, "../../components/topsites/"),
          ],
          [
            new RegExp("^resource:///modules/Dedupe.sys.mjs"),
            path.join(__dirname, "../../modules/Dedupe.sys.mjs"),
          ],
        ],
      }),
      new MozSrcUriPlugin({ baseDir: path.join(__dirname, "..", "..", "..") }),
      new webpack.BannerPlugin(
        `THIS FILE IS AUTO-GENERATED: ${path.basename(__filename)}`
      ),
      new webpack.optimize.ModuleConcatenationPlugin(),
    ],
  }),
];