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

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

function isPrivateIpv4(ip) {
  return /^(10\.|192\.168\.|172\.(1[6-9]|2\d|3[0-1])\.)/.test(ip)
}

function getPreferredLanIp() {
  const interfaces = os.networkInterfaces()
  const preferredNameReg = /(wlan|wi-?fi|wifi|ethernet|以太网)/i
  const ignoredNameReg = /(tap|vpn|virtual|vmware|hyper-v|vethernet|loopback|docker)/i
  const preferred = []
  const fallback = []

  Object.keys(interfaces).forEach(name => {
    const networkList = interfaces[name] || []
    networkList.forEach(item => {
      const family = typeof item.family === 'string' ? item.family : String(item.family)
      if (item.internal || family !== 'IPv4' || !isPrivateIpv4(item.address)) {
        return
      }
      if (ignoredNameReg.test(name)) {
        return
      }
      if (preferredNameReg.test(name)) {
        preferred.push(item.address)
        return
      }
      fallback.push(item.address)
    })
  })

  return preferred[0] || fallback[0] || ''
}

const name = defaultSettings.title || 'Sugartime' // 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 lanIp = process.env.DEV_SERVER_PUBLIC_IP || getPreferredLanIp()

// 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: {
    host: '0.0.0.0',
    public: lanIp ? `${lanIp}:${port}` : undefined,
    port: port,
    // open: true,
    overlay: {
      warnings: false,
      errors: true
    },
    before: process.env.VUE_APP_START_MOCK === 'true' ? require('./mock/mock-server.js') : null,
    proxy: {
      [process.env.VUE_APP_BASE_API]: {
        target: process.env.VUE_APP_BASE_URL,
        changeOrigin: true,
        pathRewrite: {
          ['^' + process.env.VUE_APP_BASE_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')
      }
    }
  },
  chainWebpack(config) {
    config.plugins.delete('preload') // TODO: need test
    config.plugins.delete('prefetch') // TODO: need test
    if (process.env.NODE_ENV !== 'development') {
      const buildTimeVersion = new Date().getTime()
      config.output.filename(`js/[name].v${buildTimeVersion}.js`).end()
      config.output.chunkFilename(`js/[name].v${buildTimeVersion}.js`).end()
      config.plugin('extract-css').tap(args => [{
        filename: `css/[name].v${buildTimeVersion}.css`,
        chunkFilename: `css/[name].v${buildTimeVersion}.css`
      }])
    }
    // 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()

    // set preserveWhitespace
    config.module
      .rule('vue')
      .use('vue-loader')
      .loader('vue-loader')
      .tap(options => {
        options.compilerOptions.preserveWhitespace = true
        return options
      })
      .end()
    config
    // https://webpack.js.org/configuration/devtool/#development
      .when(process.env.NODE_ENV === 'development',
        config => config.devtool('cheap-source-map')
      )

    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
                }
              }
            })
          config.optimization.runtimeChunk('single')
        }
      )
  }
}
