const webpack = require('webpack');
const fs = require('fs');
const path = require('path');
const MiniCssExtractPlugin = require('mini-css-extract-plugin');
const HtmlWebpackPlugin = require('html-webpack-plugin');
const PrerenderSPAPlugin = require('prerender-spa-plugin');
const Renderer = PrerenderSPAPlugin.PuppeteerRenderer;
const CopyWebpackPlugin = require('copy-webpack-plugin');
const UglifyJsPlugin = require('uglifyjs-webpack-plugin');
const OptimizeCSSAssetsPlugin = require('optimize-css-assets-webpack-plugin');

let root = (process.env.NODE_ENV === 'preview') ? `/${process.env.INIT_CWD.match(/([^\/]*)\/*$/)[1]}/` : '/';
for (let i = 0; i < process.argv.length; i += 1) {
  if (process.argv[i].indexOf('--root=') > -1) {
    root = `/${process.argv[i].split('=')[1]}/`;
  }
}

let config = {
  entry: './app/index.js',
  output: {
    path: path.resolve(__dirname, `public${root}`),
    publicPath: root,
    filename: 'app.js',
  },
  module: {
    rules: [
      {
        test: /\.vue$/,
        loader: 'vue-loader',
      },
      {
        test: /\.(png|jpg|gif|svg)$/,
        loader: 'file-loader',
        options: {
          name: 'img/[name].[ext]',
        },
      },
      {
        test: /\.(ttf|eot|woff(2)?)(\?[a-z0-9=&.]+)?$/,
        loader: 'file-loader',
        options: {
          name: 'fonts/[name].[ext]',
        },
      },
      {
        test: /\.ya?ml$/,
        loader: 'yaml-import-loader',
      },
      {
        test: /\.scss$/,
        use: [
          'css-hot-loader',
          MiniCssExtractPlugin.loader,
          'css-loader',
          'postcss-loader',
          'sass-loader',
        ],
      },
      {
        test: /\.css$/,
        use: [
          'css-hot-loader',
          MiniCssExtractPlugin.loader,
          'css-loader',
          'postcss-loader',
        ],
      },
      {
        enforce: 'pre',
        test: /\.js$/,
        exclude: /node_modules/,
        loader: 'eslint-loader',
      },
      {
        test: /\.js$/,
        exclude: /node_modules/,
        loader: 'babel-loader',
      },
    ],
  },
  resolve: {
    alias: {
      'vue$': 'vue/dist/vue.esm.js',
    },
  },
  plugins: [
    new MiniCssExtractPlugin({
      filename: '[name].css',
      chunkFilename: '[id].css',
    }),
    new webpack.HotModuleReplacementPlugin(),
    new CopyWebpackPlugin([
      { from: path.resolve(__dirname, './app/assets/fonts'), to: 'fonts' },
      { from: path.resolve(__dirname, './app/assets/icons'), to: 'icons' },
      { from: path.resolve(__dirname, './app/assets/img'), to: 'img' },
    ]),
  ],
  devServer: {
    contentBase: path.resolve(__dirname, './public'),
    publicPath: '/',
    historyApiFallback: true,
    inline: true,
    open: true,
    hot: true,
  },
  devtool: 'eval-source-map',
};

module.exports = config;

const locales = [];
// Import locales list
fs.readdirSync('./app/locales').forEach(file => {
  locales.push(file.replace(/(.*)\.yml/, '$1'));
});

if (process.env.NODE_ENV === 'development') {
  module.exports.plugins = (module.exports.plugins || []).concat([
    new webpack.DefinePlugin({
      'process.env': {
        NODE_ENV: '"development"',
        BASE_URL: '""',
      },
    }),
    new HtmlWebpackPlugin({
      title: 'DEVELOPMENT prerender-spa-plugin',
      template: 'index.html',
      filename: 'index.html',
    }),
  ]);
} else { // NODE_ENV === 'production|preview'
  const routes = [root];
  const pages = [];
  // Import pages list
  fs.readdirSync('./app/components/pages').forEach(file => {
    pages.push(file.replace(/(.*)\.vue/, '$1'));
  });
  // Localized routes
  for (let i = 0; i < locales.length; i += 1) {
    for (let j = 0; j < pages.length; j += 1) {
      routes.push(
        `${root}${locales[i]}${pages[j].toLowerCase().replace(/^/, '/').replace('/home', '')}`
      );
    }
  }

  module.exports.devtool = '#source-map';
  module.exports.optimization = {
    minimizer: [
      new UglifyJsPlugin({
        cache: true,
        parallel: true,
        sourceMap: true, // set to true if you want JS source maps
      }),
      new OptimizeCSSAssetsPlugin({}),
    ],
  };
  module.exports.plugins.push(
    new webpack.DefinePlugin({
      'process.env': {
        NODE_ENV: ((process.env.NODE_ENV !== 'production') ? '"preview"' : '"production"'),
        BASE_URL: `"${root.split('/')[1]}"`,
      },
    }),
    new HtmlWebpackPlugin({
      title: 'PRODUCTION prerender-spa-plugin',
      template: 'index.html',
      filename: path.resolve(__dirname, 'public/index.html'),
    }),
    new PrerenderSPAPlugin({
      staticDir: path.join(__dirname, 'public'),
      routes,
      renderer: new Renderer({
        headless: true,
        renderAfterDocumentEvent: 'render-event',
        maxConcurrentRoutes: 4,
        injectProperty: 'vuefsPrerender',
        inject: {
          prerender: true,
        },
      }),
    }),
  );
}

// Create ./public/img/lg/* symlinks only if images need translation
if (fs.existsSync('./app/assets/img/fr')) {
  if (!fs.existsSync('./public')){ fs.mkdirSync('./public'); }
  if (!fs.existsSync(`./public${root}`)){ fs.mkdirSync(`./public${root}`); }
  if (!fs.existsSync(`./public${root}img`)){ fs.mkdirSync(`./public${root}img`); }
  for (let i = 0; i < locales.length; i += 1) {
    if (!fs.existsSync(`./public${root}img/${locales[i]}`)){
      fs.mkdirSync(`./public${root}img/${locales[i]}`);
    }
    fs.readdirSync('./app/assets/img/fr').forEach(file => {
      if (!fs.existsSync(`./app/assets/img/${locales[i]}/${file}`)) {
        const symlinkOrigin = (process.env.NODE_ENV === 'development')
          ? `../../../app/assets/img/fr/${file}` // [dev] relative to assets
          : `../fr/${file}` // [prod] relative to public
        fs.symlink(symlinkOrigin, `./public${root}img/${locales[i]}/${file}`,
          function (err) { console.log(err); } // eslint-disable-line
        );
      }
    });
  }
}