const { join } = require('path');
const path = require('path');
const { readdirSync, statSync } = require('fs');
const MiniCssExtractPlugin = require('mini-css-extract-plugin');
const CopyPlugin = require('copy-webpack-plugin');
const isDev = process.env.RUNNING_ENV === 'dev';
const isProd = process.env.RUNNING_ENV === 'prod';
const webpack = require('webpack');

/**
 * 引入 src/view/pages下的页面文件，排除 _ 开头的文件夹
 */
const importEntry = () => {
  const entries = {};
  const rootDir = join(process.cwd(), '/view/page');
  readdirSync(rootDir)
    .filter(i => !i.startsWith('_'))
    .forEach(file => {
      if (statSync(join(rootDir, file)).isDirectory())
        entries[file] = `/view/page/${file}/index.ts`;
    });
  console.log(entries);
  return entries;
};

module.exports = {
  entry: importEntry(),
  output: {
    path: path.resolve(__dirname, 'public/dev'),
    publicPath: '',
    filename: '[name].js',
    chunkFilename: '[id].chunk.js?[hash:8]',
  },
  mode: isDev ? 'development' : 'production',
  module: {
    rules: [
      {
        test: /\.ts?$/,
        use: 'ts-loader',
        exclude: /node_modules/,
      },
      {
        test: /\.js$/,
        loader: 'babel-loader',
        exclude: /node_modules/,
      },
      {
        test: /\.css$/,
        use: [MiniCssExtractPlugin.loader, 'css-loader'],
      },
      {
        test: /\.less$/,
        use: [MiniCssExtractPlugin.loader, 'css-loader', 'less-loader'],
      },
      {
        test: /\.(png|jpg|gif)$/i,
        use: [
          {
            loader: 'url-loader',
            options: {
              limit: 8192,
            },
          },
        ],
      },
    ],
  },
  plugins: [
    new MiniCssExtractPlugin({
      filename: '[name].css',
      chunkFilename: '[id].css?[hash:8]',
    }),
    new CopyPlugin([
      { from: join(process.cwd(), 'view/assets'), to: 'assets' },
    ]),
    new webpack.ProvidePlugin({
      process: 'process/browser',
      Buffer: ['buffer', 'Buffer'],
    }),
  ].filter(Boolean),
  resolve: {
    extensions: ['.ts', '.js', '.ejs'],
    fallback: {
      crypto: require.resolve('crypto-browserify'),
      stream: require.resolve('stream-browserify'),
      assert: require.resolve('assert'),
    },
  },
};