'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 HtmlWebpackPlugin = require('html-webpack-plugin')
const ExtractTextPlugin = require('extract-text-webpack-plugin')
const OptimizeCSSPlugin = require('optimize-css-assets-webpack-plugin')
const UglifyJsPlugin = require('uglifyjs-webpack-plugin')

const env = require('../config/prod.env')

const webpackConfig = merge(baseWebpackConfig, {
  module: {
    rules: utils.styleLoaders({
      sourceMap: config.build.productionSourceMap,
      extract: true,
      usePostCSS: true
    })
  },
  devtool: config.build.productionSourceMap ? config.build.devtool : false,
  output: {
    path: config.build.assetsRoot,
    filename: utils.assetsPath('js/[name].[chunkhash].js'),
    chunkFilename: utils.assetsPath('js/[id].[chunkhash].js')
  },
  plugins: [
    new webpack.DefinePlugin({
      'process.env': env
    }),
    new UglifyJsPlugin({
      uglifyOptions: {
        compress: {
          warnings: false
        }
      },
      sourceMap: config.build.productionSourceMap,
      parallel: true
    }),
    new ExtractTextPlugin({
      filename: utils.assetsPath('css/[name].[contenthash].css'),
      allChunks: true,
    }),
    new OptimizeCSSPlugin({
      cssProcessorOptions: config.build.productionSourceMap
        ? { safe: true, map: { inline: false } }
        : { safe: true }
    }),

    // 主应用 HTML
    new HtmlWebpackPlugin({
      filename: config.build.index,
      template: 'index.html',
      inject: true,
      minify: {
        removeComments: true,
        collapseWhitespace: true,
        removeAttributeQuotes: true
      },
      chunksSortMode: 'dependency',
      chunks: ['manifest', 'vendor', 'app']
    }),

    // workPage 独立页面
    new HtmlWebpackPlugin({
      filename: 'workPage.html',
      template: 'public/workPage.html',
      inject: true,
      minify: {
        removeComments: true,
        collapseWhitespace: true,
        removeAttributeQuotes: true
      },
      chunksSortMode: 'dependency',
      chunks: ['workPage-manifest', 'workPage-vendor', 'workPage']
    }),

    new webpack.HashedModuleIdsPlugin(),
    new webpack.optimize.ModuleConcatenationPlugin(),

    // 关键：正确的 CommonsChunkPlugin 顺序
    
    // 1. 先提取主应用的 vendor
    new webpack.optimize.CommonsChunkPlugin({
      name: 'vendor',
      chunks: ['app'],
      minChunks: function (module) {
        return (
          module.resource &&
          /\.js$/.test(module.resource) &&
          module.resource.indexOf(path.join(__dirname, '../node_modules')) === 0
        )
      }
    }),

    // 2. 再提取 workPage 的 vendor
    new webpack.optimize.CommonsChunkPlugin({
      name: 'workPage-vendor',
      chunks: ['workPage'],
      minChunks: function (module) {
        return (
          module.resource &&
          /\.js$/.test(module.resource) &&
          module.resource.indexOf(path.join(__dirname, '../node_modules')) === 0
        )
      }
    }),

    // 3. 主应用的 manifest（必须在 vendor 之后）
    new webpack.optimize.CommonsChunkPlugin({
      name: 'manifest',
      chunks: ['vendor'],
      minChunks: Infinity
    }),

    // 4. workPage 的 manifest（必须在 workPage-vendor 之后）
    new webpack.optimize.CommonsChunkPlugin({
      name: 'workPage-manifest',
      chunks: ['workPage-vendor'],
      minChunks: Infinity
    }),

    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