var path = require('path')
var utils = require('./utils')
var webpack = require('webpack')
var config = require('../config')
var merge = require('webpack-merge')
var baseWebpackConfig = require('./webpack.base.conf')
var UglifyJsPlugin = require('uglifyjs-webpack-plugin')
var CopyWebpackPlugin = require('copy-webpack-plugin')
// var HtmlWebpackPlugin = require('html-webpack-plugin')
var ExtractTextPlugin = require('extract-text-webpack-plugin')
var OptimizeCSSPlugin = require('optimize-css-assets-webpack-plugin')

var 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('[name].[chunkhash].js'),
    // chunkFilename: utils.assetsPath('[id].[chunkhash].js')
    filename: utils.assetsPath('[name].js'),
    chunkFilename: utils.assetsPath('[id].js')
  },
  plugins: [
    // http://vuejs.github.io/vue-loader/en/workflow/production.html
    new webpack.DefinePlugin({
      'process.env': env
    }),
    new UglifyJsPlugin({
      sourceMap: true
    }),
    // extract css into its own file
    new ExtractTextPlugin({
      // filename: utils.assetsPath('[name].[contenthash].css')
      filename: utils.assetsPath(`[name].${config.build.fileExt.style}`)
    }),
    // Compress extracted CSS. We are using this plugin so that possible
    // duplicated CSS from different components can be deduped.
    new OptimizeCSSPlugin({
      cssProcessorOptions: {
        safe: true
      }
    }),
    // generate dist index.html with correct asset hash for caching.
    // you can customize output by editing /index.html
    // see https://github.com/ampedandwired/html-webpack-plugin
    // new HtmlWebpackPlugin({
    //   filename: config.build.index,
    //   template: 'index.html',
    //   inject: true,
    //   minify: {
    //     removeComments: true,
    //     collapseWhitespace: true,
    //     removeAttributeQuotes: true
    //     // more options:
    //     // https://github.com/kangax/html-minifier#options-quick-reference
    //   },
    //   // necessary to consistently work with multiple chunks via CommonsChunkPlugin
    //   chunksSortMode: 'dependency'
    // }),
    // keep module.id stable when vender modules does not change
    new webpack.HashedModuleIdsPlugin(),
    // split vendor js into its own file
    new webpack.optimize.CommonsChunkPlugin({
      name: 'common/vendor',
      minChunks: function (module, count) {
        // any required modules inside node_modules are extracted to vendor
        return (
          module.resource &&
          /\.js$/.test(module.resource) &&
          module.resource.indexOf('node_modules') >= 0
        ) || count > 1
      }
    }),
    // 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: 'common/manifest',
      chunks: ['common/vendor']
    })
  ]
})

// 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