'use strict';
const path = require('path');
const config = require('../config');
var MiniCssExtractPlugin = require('mini-css-extract-plugin')

const {VueLoaderPlugin} = require('vue-loader');

const {isDev, assetsPath} = require('./utils');

function resolve(dir) {
  return path.join(__dirname, '..', dir);
}


const createLintingRule = () => ({
  test: /\.(js|vue)$/,
  loader: 'eslint-loader',
  enforce: 'pre',
  include: [resolve('src'), resolve('test')],
  options: {
    formatter: require('eslint-friendly-formatter'),
    emitWarning: !config.dev.showEslintErrorsInOverlay,
  },
});

//todo: mini-css-extract-plugin? upgrade to webpack 4, then use this
//https://github.com/webpack-contrib/mini-css-extract-plugin
//todo: do we need postcss?
module.exports = {
  context: path.resolve(__dirname, '../'),
  entry: {
    app: './src/main.js',
  },
  output: {
    path: config.build.assetsRoot,
    filename: '[name].js',
    publicPath: isDev
      ? config.dev.assetsPublicPath
      : config.build.assetsPublicPath,
  },
  optimization: {
    splitChunks: {
      chunks: 'all'
    }
  },
  resolve: {
    extensions: ['.js', '.vue', '.json', '.gql', '.graphql', '.scss'],
    alias: {
      '@': resolve('src'),
      styles: resolve('src/styles'),
      gql: resolve('src/graphql/gql'),
      // vue: '@vue/compat',
    },
    // we probably don't need this anymore
    // fallback: {
    //   // used to be in node: {setImmediate: false,...}
    //   setImmediate: false,
    //   dgram: false,
    //   fs: false,
    //   net: false,
    //   tls: false,
    //   child_process: false,
    // },
  },
  module: {
    rules: [
      ...(config.dev.useEslint ? [createLintingRule()] : []),
      {
        test: /\.vue$/,
        loader: 'vue-loader',
        options: {
          transformAssetUrls: {
            video: ['src', 'poster'],
            source: 'src',
            img: 'src',
            image: 'xlink:href',
          },
          compilerOptions: {
            compatConfig: {
              MODE: 2,
            },
          },
        },
      },
      {
        test: /\.tsx?$/,
        loader: 'ts-loader',
        options: {
          appendTsSuffixTo: [/\.vue$/],
        },
        exclude: /node_modules/,
      },
      {
        test: /\.js$/,
        loader: 'babel-loader',
        options: {
          presets: ['@babel/preset-env'],
        },
        include: [resolve('src'), resolve('test'), resolve('node_modules/webpack-dev-server/client')],
      },
      {
        test: /\.(gql|graphql)$/,
        loader: 'graphql-tag/loader',
        exclude: /node_modules/,
      },
      {
        test: /\.(png|jpe?g|gif|svg)(\?.*)?$/,
        loader: 'url-loader',
        options: {
          limit: 10000,
          name: assetsPath('img/[name].[hash:7].[ext]'),
        },
      },
      {
        test: /\.(mp4|webm|ogg|mp3|wav|flac|aac)(\?.*)?$/,
        loader: 'url-loader',
        options: {
          limit: 10000,
          name: assetsPath('media/[name].[hash:7].[ext]'),
        },
      },
      {
        test: /\.(woff2?|eot|ttf|otf)(\?.*)?$/,
        loader: 'url-loader',
        options: {
          limit: 10000,
          name: assetsPath('fonts/[name].[hash:7].[ext]'),
        },
      },
      {
        test: /\.s?css$/,
        use: [
          isDev ? 'vue-style-loader' : MiniCssExtractPlugin.loader,
          'css-loader',
          'postcss-loader',
          'sass-loader'
        ]
      }
      // styleRule(false), // css rule
      // styleRule(true), // sass rule
    ],
  },
  plugins: [
    new VueLoaderPlugin(),
  ],

  // node: {
  //   // prevent webpack from injecting useless setImmediate polyfill because Vue
  //   // source contains it (although only uses it if it's native).
  //   setImmediate: false,
  //   // prevent webpack from injecting mocks to Node native modules
  //   // that does not make sense for the client
  //   dgram: 'empty',
  //   fs: 'empty',
  //   net: 'empty',
  //   tls: 'empty',
  //   child_process: 'empty',
  // },
};