var os = require('os')
var path = require('path')
var utils = require('./utils')
var webpack = require('webpack')
var config = require('../config')
var merge = require('webpack-merge')
var MyWebPackPluginForOne = require('./webpack_plugin')
var baseWebpackConfig = require('./webpack.base.conf')
var CopyWebpackPlugin = require('copy-webpack-plugin')
var HtmlWebpackPlugin = require('html-webpack-plugin')
var OptimizeCSSPlugin = require('optimize-css-assets-webpack-plugin')
var ExtractTextPlugin = require('extract-text-webpack-plugin')
var BundleAnalyzerPlugin = require('webpack-bundle-analyzer').BundleAnalyzerPlugin
var HappyPackPlugin = require('happypack');
var happyThreadPool = HappyPackPlugin.ThreadPool({ size: os.cpus().length });
var VisualizerPlugin = require('webpack-visualizer-plugin');

var env = process.env.NODE_ENV === 'testing'
  ? require('../config/test.env')
  : config.build.env

var webpackConfig = merge(baseWebpackConfig, {
  module: {
    rules: utils.styleLoaders({
      sourceMap: config.build.productionSourceMap,
      extract: true
    })
  },
  devtool: config.build.productionSourceMap ? '#source-map' : false,
  output: {
    path: config.build.assetsRoot,
    filename: utils.assetsPath('js/[name].[chunkhash].js'),
    chunkFilename: utils.assetsPath('js/[id].[chunkhash].js')
  },
  plugins: [
    new HappyPackPlugin({
      id: 'eslint',
      threadPool: happyThreadPool,
      loaders: ['eslint-loader']
    }),
    new HappyPackPlugin({
      id: 'js',
      threadPool: happyThreadPool,
      loaders: [{
        loader: 'babel-loader',
        options: {
          cacheDirectory: true
        }
      }]
    }),
    new HappyPackPlugin({
      id: 'css',
      threadPool: happyThreadPool,
      loaders: [
        'vue-loader',
        'css-loader',
        'less-loader',
      ]
    }),
    // new webpack.DllReferencePlugin({
    //   name: 'vendor_library',
    //   context: __dirname,
    //   manifest: require('../static/dll/vendor-mainfest.json')
    // }),
    // http://vuejs.github.io/vue-loader/en/workflow/production.html
    new webpack.DefinePlugin({
      'process.env': env
    }),
    new webpack.optimize.UglifyJsPlugin({
      compress: {
        warnings: false,
        drop_debugger: true,
        drop_console: true
      },
      exclude: /(node_modules)/,// 排除static文件夹 !!! (仅添加这一行代码即可,如果你也使用了UglifyJsPlugin)
      sourceMap: false
    }),
    // Ignore all locale files of moment.js
    new webpack.IgnorePlugin(/^\.\/locale$/, /moment$/),
    // extract css into its own file
    new ExtractTextPlugin({
      filename: utils.assetsPath('css/[name].[contenthash].css')
    }),
    // Compress extracted CSS. We are using this plugin so that possible
    // duplicated CSS from different components can be deduped.
    new OptimizeCSSPlugin({
      cssProcessorOptions: {
        safe: true
      }
    }),
    // split vendor js into its own file
    new webpack.optimize.CommonsChunkPlugin({
      name: 'vendor',
      minChunks: function (module, count) {
        // 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',
      chunks: ['vendor']
    }),
    // copy custom static assets
    new CopyWebpackPlugin([
      {
        from: path.resolve(__dirname, '../static'),
        to: config.build.assetsSubDirectory,
        ignore: ['.*']
      }
    ]),
    new MyWebPackPluginForOne(),
    ...utils.getHtmlWebpackPlugins(),

    // 分析打包大小
    // new BundleAnalyzerPlugin(),
    // new VisualizerPlugin({
    //   filename: './statistics.html'
    // })
  ]
})

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

module.exports = webpackConfig