import path from "path";
import webpack from "webpack";

import CopyWebpackPlugin from "copy-webpack-plugin";

const node_env = (): "development" | "production" | undefined => {
  let env = process.env.NODE_ENV;
  if (env === "production") return env;
  if (env === "development") return env;
  if (env === undefined) return undefined;

  console.log(
    `Invalid NODE_ENV: ${env}. Can only be production, development, or undefined.`
  );
  process.exit(1);
};

const options: webpack.Configuration = {
  mode: node_env(),
  entry: {
    popup: path.join(__dirname, "src", "popup.ts"),
    background: path.join(__dirname, "src", "background.ts"),
  },
  output: {
    path: path.join(__dirname, "build"),
    filename: "[name].bundle.js",
  },

  resolve: {
    extensions: [".ts", ".js"],
  },

  module: {
    rules: [
      {
        test: /\.tsx?$/,
        use: "ts-loader",
        exclude: /node_modules/,
      },
    ],
  },

  plugins: [
    new CopyWebpackPlugin({
      patterns: [
        // Copy the manifest, adding in the version and the description from the
        // package.json file.
        {
          from: "src/manifest.json",
          transform: (content, _) => {
            const oldContent = JSON.parse(content.toString());
            const newContent = {
              description: process.env.npm_package_description,
              version: process.env.npm_package_version,
              ...oldContent,
            };
            return Buffer.from(JSON.stringify(newContent));
          },
        },
      ],
    }),
  ],
};

export default options;