const path = require("path");
const glob = require("glob-all");
const ExtractTextPlugin = require("extract-text-webpack-plugin");
const HtmlWebpackPlugin = require("html-webpack-plugin");
const CopyWebpackPlugin = require("copy-webpack-plugin");
const PurgecssPlugin = require("purgecss-webpack-plugin");

/**
 * Custom PurgeCSS Extractor
 * https://github.com/FullHuman/purgecss
 * https://github.com/FullHuman/purgecss-webpack-plugin
 */
class TailwindExtractor {
  static extract(content) {
    return content.match(/[A-z0-9-:\/]+/g);
  }
}

module.exports = {
  entry: "./src/css/tailwind.src.css",
  mode: process.env.NODE_ENV,
  module: {
    rules: [
      {
        test: /\.css$/,
        use: ExtractTextPlugin.extract({
          fallback: "style-loader",
          use: [
            { loader: "css-loader", options: { importLoaders: 1 } },
            "postcss-loader",
          ],
        }),
      },
    ],
  },
  plugins: [
    new ExtractTextPlugin("styles.css", {
      disable: process.env.NODE_ENV === "development",
    }),
    new HtmlWebpackPlugin({
      filename: "index.html",
      template: "src/index.html",
    }),
    /// Enable images folder
    new CopyWebpackPlugin([
      {
        from: "src/images",
        to: "images",
      },
    ]),
    new PurgecssPlugin({
      paths: glob.sync([path.join(__dirname, "src/**/*.html")]),
      extractors: [
        {
          extractor: TailwindExtractor,
          extensions: ["html", "js"],
        },
      ],
    }),
  ],
};