'use strict'
const path = require('path')
const defaultSettings = require('./src/settings.js')

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

const name = defaultSettings.title || 'vue Admin Template' // page title

// If your port is set to 80,
// use administrator privileges to execute the command line.
// For example, Mac: sudo npm run
// You can change the port by the following methods:
// port = 9528 npm run dev OR npm run dev --port = 9528
const port = process.env.port || process.env.npm_config_port || 9528 // dev port

const isProd = process.env.NODE_ENV === 'production' // 通过全局变量判断是否是生产环境
let externals = {} // 排除要打包文件
let cdn = { css: [], js: [] } // 把排除的包 替换为相应的cdn
if (isProd) { // 如果是生产环境 就排除打包 否则不排除
  // key(是要排除的包名): value(实际上是实际引入的包的全局的变量名)
  // CDN文件中有ELEMENTUI的全局变量名
  externals = {
    'vue': 'Vue',
    'element': 'ELEMENT',
    'xlsx': 'XLSX'
  }
  cdn = {
    css: [
      // element-ui css
      'https://unpkg.com/element-ui/lib/theme-chalk/index.css' // 样式表
    ],
    js: [
      // vue must at first!
      'https://cdn.jsdelivr.net/npm/vue@2', // vuejs
      // element-ui js
      'https://unpkg.com/element-ui/lib/index.js', // elementUI
      'https://cdn.jsdelivr.net/npm/xlsx@0.16.9/dist/jszip.min.js',
      'https://cdn.jsdelivr.net/npm/xlsx@0.16.9/dist/xlsx.full.min.js'
    ]
  }
}

// All configuration item explanations can be find in https://cli.vuejs.org/config/
module.exports = {
  /**
   * You will need to set publicPath if you plan to deploy your site under a sub path,
   * for example GitHub Pages. If you plan to deploy your site to https://foo.github.io/bar/,
   * then publicPath should be set to "/bar/".
   * In most cases please use '/' !!!
   * Detail: https://cli.vuejs.org/config/#publicpath
   */
  publicPath: '/',
  outputDir: 'dist',
  assetsDir: 'static',
  lintOnSave: process.env.NODE_ENV === 'development',
  productionSourceMap: false,
  devServer: {
    port: port,
    open: true,
    overlay: {
      warnings: false,
      errors: true
    },
    // 反向代理
    proxy: {
      // 当我们的本地的请求 有/api的时候，就会代理我们的请求地址向另外一个服务器发出请求
      '/api': {
        target: 'http://ihrm.itheima.net/', // 跨域请求地址
        changeOrigin: true // 是否开启跨域
        // 地址重写，如果访问的服务器没有/api就将地址重写，把/api去掉
        // pathRewrite: {
        //   '/api': ''
        // }
      }
    }
  },
  configureWebpack: {
    // provide the app's title in webpack's name field, so that
    // it can be accessed in index.html to inject the correct title.
    name: name,
    resolve: {
      alias: {
        '@': resolve('src')
      }
    },
    // externals 首先会排除掉 定义的包名，空出来的位置 会用变量(value)来替换
    externals: externals // 排除要打包文件
  },
  chainWebpack(config) {
    // it can improve the speed of the first screen, it is recommended to turn on preload
    config.plugin('preload').tap(() => [
      {
        rel: 'preload',
        // to ignore runtime.js
        // https://github.com/vuejs/vue-cli/blob/dev/packages/@vue/cli-service/lib/config/app.js#L171
        fileBlacklist: [/\.map$/, /hot-update\.js$/, /runtime\..*\.js$/],
        include: 'initial'
      }
    ])

    config.plugin('html').tap(args => { // 注入CDN
      args[0].cdn = cdn
      return args
    })

    // when there are many pages, it will cause too many meaningless requests
    config.plugins.delete('prefetch')

    // set svg-sprite-loader
    config.module.rule('svg').exclude.add(resolve('src/icons')).end()
    config.module.rule('icons')
      .test(/\.svg$/)
      .include
      .add(resolve('src/icons'))
      .end()
      .use('svg-sprite-loader')
      .loader('svg-sprite-loader')
      .options({
        symbolId: 'icon-[name]'
      })
      .end()

    config.when(process.env.NODE_ENV !== 'development',
      config => {
        config.plugin('ScriptExtHtmlWebpackPlugin')
          .after('html')
          .use('script-ext-html-webpack-plugin', [
            {
              // `runtime` must same as runtimeChunk name. default is `runtime`
              inline: /runtime\..*\.js$/
            }])
          .end()
        config.optimization.splitChunks({
          chunks: 'all',
          cacheGroups: {
            libs: {
              name: 'chunk-libs',
              test: /[\\/]node_modules[\\/]/,
              priority: 10,
              chunks: 'initial' // only package third parties that are initially dependent
            },
            elementUI: {
              name: 'chunk-elementUI', // split elementUI into a single package
              priority: 20, // the weight needs to be larger than libs and app or it will be packaged into libs or app
              test: /[\\/]node_modules[\\/]_?element-ui(.*)/ // in order to adapt to cnpm
            },
            commons: {
              name: 'chunk-commons',
              test: resolve('src/components'), // can customize your rules
              minChunks: 3, //  minimum common number
              priority: 5,
              reuseExistingChunk: true
            }
          }
        })
        // https:// webpack.js.org/configuration/optimization/#optimizationruntimechunk
        config.optimization.runtimeChunk('single')
      }
    )
  }
}