'use strict'
const path = require('path')
require('babel-polyfill')
const productionGzipExtensions = ['js', 'css']
const UglifyJsPlugin = require('uglifyjs-webpack-plugin')
const CompressionWebpackPlugin = require('compression-webpack-plugin')
const defaultSettings = require('./src/settings.js')
const isProduction = process.env.NODE_ENV === 'production'
function resolve(dir) {
  return path.join(__dirname, dir)
}

const name = defaultSettings.title || '采销平台' // 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 method:
// port = 8080 npm run dev OR npm run dev --port = 8080
const port = process.env.port || process.env.npm_config_port || 8080 // dev port

// 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: false, // process.env.NODE_ENV === 'development'
  productionSourceMap: false,
  devServer: {
    headers: {
      'max-http-header-size': 1024000
    },
    // proxy: {
    //   "/admin": {
    //     target: process.env.NODE_ENV,
    //     ws: true,
    //     secure: false,  // 如果是https接口，需要配置这个参数
    //     changeOrigin: true, // 是否跨域
    //     // pathRewrite: {
    //     //   // 路径重写
    //     //   "/admin": "/admin" // 这个意思就是以api开头的，定向到哪里, 如果你的后边还有路径的话， 会自动拼接上
    //     // }
    //   }
    // },
    port: port,
    open: true,
    overlay: {
      warnings: false,
      errors: true
    }
    // before: require('./mock/mock-server.js')
  },
  configureWebpack: (config) => {
    // 入口文件
    config.entry.app = ['babel-polyfill', './src/main.js']
    config.externals = {
      vue: 'Vue',
      // 'vuex': 'Vuex',
      axios: 'axios',
      'vue-router': 'VueRouter'
    }
    if (isProduction) {
      config.plugins.push(
        new CompressionWebpackPlugin({
          algorithm: 'gzip',
          test: new RegExp('\\.(' + productionGzipExtensions.join('|') + ')$'),
          threshold: 10240,
          // deleteOriginalAssets:true, //删除源文件，不建议
          minRatio: 0.7
        })
      )
    }
    // 删除console插件
    const plugins = [
      new UglifyJsPlugin({
        uglifyOptions: {
          compress: {
            // warnings: false, // `warnings` is not a supported option
            drop_console: true,
            drop_debugger: true
          },
          output: {
            // 去掉注释内容
            comments: true
          }
        },
        cache: true, // 启用/禁用文件缓存（类型可布尔也可是字符串）
        sourceMap: false,
        parallel: true
      })
    ]
    // 只有打包生产环境才需要将console删除
    if (isProduction) {
      config.plugins = [...config.plugins, ...plugins]
    }
  },

  chainWebpack(config) {
    // it can improve the speed of the first screen, it is recommended to turn on preload
    // 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'
      }
    ])

    // 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$/)
      .include.add(resolve('src/icons'))
      .end()
      .use('svg-sprite-loader')
      .loader('svg-sprite-loader')
      .options({
        symbolId: 'icon-[name]'
      })
      .end()
    // process.env.NODE_ENV !== 'development'
    config.when(true, (config) => {
      config
        .plugin('ScriptExtHtmlWebpackPlugin')
        .after('html')
        .use('script-ext-html-webpack-plugin', [
          {
            // `runtime` must same as runtimeChunk name. default is `runtime`
            inline: /runtime\..*\.js$/
          }
        ])
        .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')
    })
  }
}