"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 =
  process.env.NODE_ENV === "testing"
    ? require("../config/test.env")
    : require("../config/prod.env");

// cdn 引入
let externalModules = {};
//cdn 配置
let externalConfig = [];
if (process.env.NODE_ENV === "production") {
  //生产环境
  externalModules = {
    vue: "Vue",
    "vue-router": "VueRouter",
    vuex: "Vuex",
    axios: "axios",
    "element-ui": "element-ui",
    echarts: "echarts",
    'vuex-persistedstate':'persistedstate',
    'highlight':'hljs'
  };
  externalConfig = [
    { js: "https://cdn.jsdelivr.net/npm/vue@2.5.2/dist/vue.js", css: "" },
    {
      js: "https://cdn.bootcdn.net/ajax/libs/vue-router/3.0.1/vue-router.min.js",
      css: "",
    },
    { js: "https://unpkg.com/axios/dist/axios.min.js", css: "" },
    { js: "https://cdn.bootcss.com/vuex/3.6.2/vuex.min.js", css: "" },
    {
      js: "https://unpkg.com/element-ui/lib/index.js",
      css: "https://unpkg.com/element-ui/lib/theme-chalk/index.css",
    },
    {
      js: "https://cdn.jsdelivr.net/npm/echarts@5.3.3/dist/echarts.min.js",
      css: "",
    },
    {
      js: "https://cdn.bootcdn.net/ajax/libs/highlight.js/11.6.0/highlight.min.js",
      css: "",
    },
    {
      js: "",
      css: "https://cdn.bootcdn.net/ajax/libs/github-markdown-css/5.1.0/github-markdown-dark.css",
    },
    {js:'https://cdn.bootcdn.net/ajax/libs/vuex-persistedstate/4.1.0/vuex-persistedstate.es.min.js',css:''}
  ];
}

const webpackConfig = merge(baseWebpackConfig, {
  externals: externalModules, //打包忽略
  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:
        process.env.NODE_ENV === "testing" ? "index.html" : 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",
      cdnConfig: externalConfig, // cdn配置
      onlyCss: true, //dev下只加载css
    }),
    // 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 myblog_static assets
    new CopyWebpackPlugin([
      {
        from: path.resolve(__dirname, "../myblog_static"),
        to: config.build.assetsSubDirectory,
        ignore: [".*"],
      },
    ]),
  ],
});

if (config.build.productionGzip) {
  const CompressionWebpackPlugin = require("compression-webpack-plugin");
  webpackConfig.plugins.push(
    new CompressionWebpackPlugin({
      filename: "[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());
}

if (config.build.isIgnoreLogs) {
  const UglifyJsPlugin = require("uglifyjs-webpack-plugin");
  let optimization = [
    new UglifyJsPlugin({
      uglifyOptions: {
        compress: {
          warnings: false,
          drop_debugger: true, //去掉debugger
          drop_console: true, // 去掉console
          pure_funcs: ["console.log"], // 移除console
        },
      },
      sourceMap: config.build.productionSourceMap,
      parallel: true,
    }),
  ];
  webpackConfig.plugins.push(...optimization);
}

module.exports = webpackConfig;