'use strict'
const path = require('path')
const utils = require('./utils')
const webpack = require('webpack')
const config = require('./config')
const merge = require('webpack-merge')
const baseWebpackConfig = require('./webpack.base.conf')
const CopyWebpackPlugin = require('copy-webpack-plugin')
const ExtractTextPlugin = require('extract-text-webpack-plugin')
const OptimizeCSSPlugin = require('optimize-css-assets-webpack-plugin')
const UglifyJsPlugin = require('uglifyjs-webpack-plugin')
const WebpackBar = require('webpackbar')
const env = process.env.NODE_ENV === 'testing'
  ? require('./config/test.env')
  : require('./config/prod.env')


// 获取当前打包的目录名称
const webpackConfig = merge(baseWebpackConfig, {
  module: {
    rules: utils.styleLoaders({
      sourceMap: config.build.productionSourceMap,
      extract: true,
      usePostCSS: true
    })
  },
  output: {
    filename: utils.assetsPath('js/[name].[chunkhash].js'),
    chunkFilename: utils.assetsPath('js/[id].[chunkhash].js')
  },
  externals: {
    'vue' : 'Vue',
    'vuex' : 'Vuex',
    // 'element-ui' : 'ElementUI',
    //将需要忽略打包的都写在这个里面，但前提是index.html文件里面必须script引入
  },
  plugins: [
    // 添加 进度条
    new WebpackBar(),
    // http://vuejs.github.io/vue-loader/en/workflow/production.html
    new webpack.DefinePlugin({
      'process.env': env
    }),
    new UglifyJsPlugin({
      uglifyOptions: {
        compress: {
          warnings: false
        }
      },
      sourceMap: config.build.productionSourceMap,
      parallel: true
    }),
    // extract css into its own file
    new ExtractTextPlugin({
      filename: utils.assetsPath('css/[name].[contenthash].css'),
      // Setting the following option to `false` will not extract CSS from codesplit chunks.
      // Their CSS will instead be inserted dynamically with style-loader when the codesplit chunk has been loaded by webpack.
      // It's currently set to `true` because we are seeing that sourcemaps are included in the codesplit bundle as well when it's `false`,
      // increasing file size: https://github.com/vuejs-templates/webpack/issues/1110
      allChunks: true,
    }),
    // Compress extracted CSS. We are using this plugin so that possible
    // duplicated CSS from different components can be deduped.
    new OptimizeCSSPlugin({
      cssProcessorOptions: config.build.productionSourceMap
        ? { safe: true, map: { inline: false } }
        : { safe: true }
    }),
    // generate dist index.html with correct asset hash for caching.
    // you can customize output by editing /index.html
    // see https://github.com/ampedandwired/html-webpack-plugin
    /*
     new HtmlWebpackPlugin({
     filename: process.env.NODE_ENV === 'testing'
     ? 'index.html'
     : config.build.index,
     // template: 'index.html',
     template: config.build.htmlTemplate,
     inject: true,
     minify: {
     removeComments: true,
     collapseWhitespace: true,
     removeAttributeQuotes: true
     // more options:
     // https://github.com/kangax/html-minifier#options-quick-reference
     },
     // necessary to consistently work with multiple chunks via CommonsChunkPlugin
     chunksSortMode: 'dependency'
     }),
     */
    // keep module.id stable when vendor modules does not change
    new webpack.HashedModuleIdsPlugin(),
    // enable scope hoisting
    new webpack.optimize.ModuleConcatenationPlugin(),
    // split vendor js into its own file
    new webpack.optimize.CommonsChunkPlugin({
      name: 'vendor',
      minChunks(module) {
        // any required modules inside node_modules are extracted to vendor
        return (
          module.resource &&
          /\.js$/.test(module.resource) &&
          module.resource.indexOf(
            path.join(__dirname, '../node_modules')
          ) === 0
        )
      }
    }),
    // extract webpack runtime and module manifest to its own file in order to
    // prevent vendor hash from being updated whenever app bundle is updated
    new webpack.optimize.CommonsChunkPlugin({
      name: 'manifest',
      minChunks: Infinity
    }),
    // This instance extracts shared chunks from code splitted chunks and bundles them
    // in a separate chunk, similar to the vendor chunk
    // see: https://webpack.js.org/plugins/commons-chunk-plugin/#extra-async-commons-chunk
    new webpack.optimize.CommonsChunkPlugin({
      name: 'app',
      async: 'vendor-async',
      children: true,
      minChunks: 3
    }),

    new webpack.optimize.CommonsChunkPlugin({
      name: 'elementUI',
      chunks: ['vendor', 'manifest', 'app'],
      minChunks: function (module, count) {
        return module.resource && /element-ui/.test(module.resource)
      }
    }),
    new webpack.optimize.CommonsChunkPlugin({
      name: 'hiui',
      chunks: ['vendor', 'manifest', 'app'],
      minChunks: function (module, count) {
        return module.resource && /hi-ui/.test(module.resource)
      }
    }),
    // copy custom static assets
    // new CopyWebpackPlugin([
    //   {
    //     from: path.resolve(__dirname, '../static'),
    //     to: config.build.assetsSubDirectory,
    //     ignore: ['.*']
    //   }
    // ])
  ]
})

if (config.build.productionGzip) {
  const CompressionWebpackPlugin = require('compression-webpack-plugin')

  webpackConfig.plugins.push(
    new CompressionWebpackPlugin({
      asset: '[path].gz[query]',
      algorithm: 'gzip',
      test: new RegExp(
        '\\.(' +
        config.build.productionGzipExtensions.join('|') +
        ')$'
      ),
      threshold: 10240,
      minRatio: 0.8
    })
  )
}

if (config.build.bundleAnalyzerReport) {
  const BundleAnalyzerPlugin = require('webpack-bundle-analyzer').BundleAnalyzerPlugin
  webpackConfig.plugins.push(new BundleAnalyzerPlugin())
}

module.exports = webpackConfig