const path = require('path')
const webpack = require('webpack')
const createThemeColorReplacerPlugin = require('./config/plugin.config')
const CompressionWebpackPlugin = require('compression-webpack-plugin')
const productionGzipExtensions = ['js', 'css']

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

const isProd = process.env.NODE_ENV === 'production'

const assetsCDN = {
  // webpack build externals
  externals: {
    vue: 'Vue',
    'vue-router': 'VueRouter',
    vuex: 'Vuex',
    axios: 'axios'
  },
  css: [],
  // https://unpkg.com/browse/vue@2.6.10/
  js: [
    '//imgcdn.ybhdmob.com/npm/vue@2.6.14/vue.min.js',
    '//imgcdn.ybhdmob.com/npm/vue-router@3.1.3/vue-router.min.js',
    '//imgcdn.ybhdmob.com/npm/vuex@3.1.1/vuex.min.js',
    '//imgcdn.ybhdmob.com/npm/axios@0.19.0/axios.min.js'
  ]
}

// vue.config.js
const vueConfig = {
  lintOnSave: false, // 关闭eslintrc语法检查
  runtimeCompiler: true,
  configureWebpack: {
    // webpack plugins
    plugins: [
      // Ignore all locale files of moment.js
      new webpack.IgnorePlugin(/^\.\/locale$/, /moment$/),
      // maxChunks：使用大于或等于 1 的值，来限制 chunk 的最大数量。使用 1 防止添加任何其他额外的 chunk，这是因为entry/main chunk 也会包含在计数之中。
      // minChunkSize: 设置 chunk 的最小大小。
      // 在合并 chunk 时，webpack 会尝试识别出具有重复模块的 chunk，并优先进行合并。任何模块都不会被合并到 entry   chunk 中，以免影响初始页面加载时间。
      new webpack.optimize.LimitChunkCountPlugin({
        maxChunks: 5,
        minChunkSize: 100
      }),
      // 配置compression-webpack-plugin压缩
      new CompressionWebpackPlugin({
        algorithm: 'gzip',
        test: new RegExp('\\.(' + productionGzipExtensions.join('|') + ')$'),
        threshold: 10240,
        minRatio: 0.8,
        deleteOriginalAssets: false // 是否删除源文件 默认为true   如果Nginx配置了gzip可以true，否则删了源文件就不能正常访问了
      })
    ],
    // if prod, add externals
    externals: isProd ? assetsCDN.externals : {}
  },

  chainWebpack: config => {
    config.resolve.alias.set('@$', resolve('src'))

    const svgRule = config.module.rule('svg')
    svgRule.uses.clear()
    svgRule
      .oneOf('inline')
      .resourceQuery(/inline/)
      .use('vue-svg-icon-loader')
      .loader('vue-svg-icon-loader')
      .end()
      .end()
      .oneOf('external')
      .use('file-loader')
      .loader('file-loader')
      .options({
        name: 'assets/[name].[hash:8].[ext]'
      })

    // if prod is on
    // assets require on cdn
    if (isProd) {
      config.plugin('html').tap(args => {
        args[0].cdn = assetsCDN
        return args
      })
    }
  },

  css: {
    loaderOptions: {
      less: {
        modifyVars: {
          'primary-color': '#2F54EB',
          'layout-color': '#2F54EB',
          'border-radius-base': '2px'
        },
        // DO NOT REMOVE THIS LINE
        javascriptEnabled: true
      }
    }
  },

  devServer: {
    port: 81,
    proxy: {
      '/api': {
        target: process.env.VUE_APP_API_BASE_URL,
        ws: false,
        changeOrigin: true,
        pathRewrite: {
          '^/api': '/api' // 需要rewrite的,
        }
      },
      '/bapi': {
        target: process.env.VUE_APP_API_BASE_URL,
        ws: false,
        changeOrigin: true,
        pathRewrite: {
          '^/bapi': '/bapi' // 需要rewrite的,
        }
      },
      '/hubs': {
        target: process.env.VUE_APP_SOCKET_BASE_URL,
        ws: true,
        changeOrigin: true
      }
    }
  },

  // disable source map in production
  productionSourceMap: false,
  // babel-loader no-ignore node_modules/*
  transpileDependencies: []
}

// preview.pro.loacg.com only do not use in your production;
if (process.env.VUE_APP_PREVIEW === 'true') {
  // eslint-disable-next-line no-labels
  // runtimeCompiler: true,
  // add `ThemeColorReplacer` plugin to webpack plugins
  vueConfig.configureWebpack.plugins.push(createThemeColorReplacerPlugin())
}

module.exports = vueConfig