'use strict'
const path = require('path')
const utils = require('./utils')
const config = require('./config')
const vueLoaderConfig = require('./vue-loader.conf')

//听说可以 把任务分解给多个子进程去并发的执行,提高速度
const HappyPack = require('happypack')
const os = require('os')
const happyThreadPool = HappyPack.ThreadPool({ size: os.cpus().length })

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

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

module.exports = {
  context: path.resolve(__dirname, '../'),
  // entry: {
  //   app: './src/main.js'
  // },
  entry() {
    // 初始化入口配置
    const entry = {}
    // 所有模块的列表
    const moduleToBuild = require('./module-conf').getModuleToBuild() || []
    // 根据传入的待打包目录名称，构建多入口配置
    for (let module of moduleToBuild) {
      // entry[module] = `${module}/index.js`
      let name = module.replace(/\//gi, '_');
      entry[name] = `${module}/index.js`
    }
    return entry
  },
  output: {
    path: config.build.assetsRoot,
    filename: '[name].js',
    publicPath: process.env.NODE_ENV === 'production'
      ? config.build.assetsPublicPath
      : config.dev.assetsPublicPath
  },
  resolve: {
    extensions: ['.js', '.vue', '.json'],
    alias: {
      '@': resolve('src'),
    }
  },
  module: {
    rules: [
      ...(config.dev.useEslint ? [createLintingRule()] : []),
      {
        test: /\.vue$/,
        loader: 'vue-loader',
        options: vueLoaderConfig
      },
      {
        test: /\.(js|dtvevt)$/,
        loader: 'HappyPack/loader?id=happyBabel',
        // loader: 'babel-loader',
        include: [resolve('src'), resolve('test'), resolve('node_modules/webpack-dev-server/client')]
      },
      {
        test: /\.(png|jpe?g|gif|svg)(\?.*)?$/,
        loader: 'url-loader',
        options: {
          limit: 10000,
          name: utils.assetsPath('img/[name].[hash:7].[ext]')
        }
      },
      {
        test: /\.(mp4|webm|ogg|mp3|wav|flac|aac)(\?.*)?$/,
        loader: 'url-loader',
        options: {
          limit: 10000,
          name: utils.assetsPath('media/[name].[hash:7].[ext]')
        }
      },
      {
        test: /\.(woff2?|eot|ttf|otf)(\?.*)?$/,
        loader: 'url-loader',
        options: {
          limit: 10000,
          name: utils.assetsPath('fonts/[name].[hash:7].[ext]')
        }
      }
    ]
  },
  plugins: [
    new HappyPack({
      // id标识happypack处理那一类文件
      id: 'happyBabel',
      // 配置loader
      loaders: [{
        loader: 'babel-loader?cacheDirectory=true'
      }],
      // // 共享进程池
      threadPool: happyThreadPool,
      // // 日志输出
      verbose: false
    })
  ],
  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'
  }
}