const path = require("path");
const glob = require("glob-all");
const MiniCssExtractPlugin = require("mini-css-extract-plugin");
const CssMinimizerPlugin = require("css-minimizer-webpack-plugin");
const CopyWebpackPlugin = require("copy-webpack-plugin");
const SpriteLoaderPlugin = require("svg-sprite-loader/plugin");
const PurgecssPlugin = require("purgecss-webpack-plugin");

module.exports = (env, options) => {
  const devMode = options.mode !== "production";

  return {
    entry: {
      app: glob.sync("./vendor/**/*.js").concat(["./js/app.js"]),
    },
    output: {
      path: path.resolve(__dirname, "../priv/static/js"),
      filename: "[name].js",
      publicPath: "/js/",
    },
    module: {
      rules: [
        {
          test: /\.js$/,
          exclude: /node_modules/,
          use: {
            loader: "babel-loader",
          },
        },
        {
          test: /\.[s]?css$/,
          use: [
            MiniCssExtractPlugin.loader,
            "css-loader",
            "sass-loader",
            "postcss-loader",
          ],
        },
        {
          test: /\.(woff(2)?|ttf|eot)(\?v=\d+\.\d+\.\d+)?$/,
          use: [
            {
              loader: "file-loader",
              options: {
                esModule: false,
                name: "[name].[ext]",
                outputPath: "../fonts",
              },
            },
          ],
        },
        {
          test: /\.svg$/,
          loader: "svg-sprite-loader",
          options: {
            extract: true,
            spriteFilename: "icons.svg",
            publicPath: "../images/",
            symbolId: (filePath) => {
              if (filePath.includes("bootstrap-icons")) {
                return `bi-${path.basename(filePath).slice(0, -4)}`;
              } else if (filePath.includes("@mdi")) {
                return `mdi-${path.basename(filePath).slice(0, -4)}`;
              } else if (filePath.includes("heroicons")) {
                if (filePath.includes("outline")) {
                  return `hio-${path.basename(filePath).slice(0, -4)}`;
                } else {
                  return `his-${path.basename(filePath).slice(0, -4)}`;
                }
              } else {
                return `${path.basename(filePath).slice(0, -4)}`;
              }
            },
          },
        },
      ],
    },
    plugins: [
      new MiniCssExtractPlugin({ filename: "../css/app.css" }),
      new SpriteLoaderPlugin({ plainSprite: true }),
      new CopyWebpackPlugin({
        patterns: [{ from: "static/", to: "../" }],
      }),
    ].concat(
      devMode
        ? []
        : [
            new PurgecssPlugin({
              paths: glob.sync([
                "../**/*.html.leex",
                "../**/*.html.eex",
                "../**/views/**/*.ex",
                "../**/live/**/*.ex",
                "./js/**/*.js",
              ]),
              safelist: [/phx/, /topbar/],
            }),
          ]
    ),
    optimization: {
      minimizer: ["...", new CssMinimizerPlugin()],
    },
    devtool: devMode ? "source-map" : undefined,
  };
};