'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: [
		// 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: 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'
		// }),

		// 多页面配置
		new HtmlWebpackPlugin({
			entry: "../src/main.js",
			filename: config.build.index,
			template: 'index.html',
			inject: true,
			minify: {
				removeComments: true,
				collapseWhitespace: true,
				removeAttributeQuotes: true
			},
			chunksSortMode: 'dependency'
		}),

		// new HtmlWebpackPlugin({
		// 	entry: "../src/pages/ffmpeg/main.js",
		// 	filename: config.build.ffmpeg,
		// 	// filename: 'ffmpeg.html',
		// 	template: 'index.html',
		// 	inject: true,
		// 	minify: {
		// 		removeComments: true,
		// 		collapseWhitespace: true,
		// 		removeAttributeQuotes: true
		// 	},
		// 	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
		}),

		// 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