const path = require('path');
const defaultSettings = require('./src/settings.js');
const CompressionPlugin = require('compression-webpack-plugin');

function resolve(dir) {
  return path.join(__dirname, dir);
}

const name = defaultSettings.title || '教研中心'; // page title

const port = process.env.port || process.env.npm_config_port || 9590; // dev port

// All configuration item explanations can be find in https://cli.vuejs.org/config/
module.exports = {
  publicPath: process.env.NODE_ENV === 'development' ? '/' : '/GCLS-TC',
  // publicPath: '/',
  outputDir: 'dist',
  assetsDir: 'static',
  lintOnSave: false,
  productionSourceMap: false,
  devServer: {
    public: `localhost:${port}`,
    port,
    open: true,
    overlay: {
      warnings: false,
      errors: true,
    },
    proxy: {
      // change xxx-api/login => mock/login
      // detail: https://cli.vuejs.org/config/#devserver-proxy
      // http://mk.wmjh.cn
      // https://gcls.helxsoft.cn
      [process.env.VUE_APP_BASE_API]: {
        target: `https://gcls.helxsoft.cn/`,
        changeOrigin: true,
        pathRewrite: {
          [`^${process.env.VUE_APP_BASE_API}`]: '',
        },
      },
      [process.env.VUE_APP_PDF_API]: {
        target: `https://gcls.helxsoft.cn`,
        changeOrigin: true,
        pathRewrite: {
          [`^${process.env.VUE_APP_PDF_API}`]: '/',
        },
      },
    },
  },
  configureWebpack: {
    // provide the app's title in webpack's name field, so that
    // it can be accessed in index.html to inject the correct title.
    name,
    resolve: {
      alias: {
        '@': resolve('src'),
      },
    },
    plugins: [
      new CompressionPlugin({
        algorithm: 'gzip', // 使用gzip压缩
        test: /\.js$|\.html$|\.css$/, // 匹配文件名
        minRatio: 0.8, // 压缩率小于0.8才会压缩
        threshold: 10240, // 对超过10k的数据压缩
        deleteOriginalAssets: false, // 是否删除未压缩的源文件，谨慎设置，如果希望提供非gzip的资源，可不设置或者设置为false（比如删除打包后的gz后还可以加载到原始资源文件）
      }),
    ],
  },
  chainWebpack(config) {
    // it can improve the speed of the first screen, it is recommended to turn on preload
    config.plugin('preload').tap(() => [
      {
        rel: 'preload',
        // to ignore runtime.js
        // https://github.com/vuejs/vue-cli/blob/dev/packages/@vue/cli-service/lib/config/app.js#L171
        fileBlacklist: [/\.map$/, /hot-update\.js$/, /runtime\..*\.js$/],
        include: 'initial',
      },
    ]);

    // when there are many pages, it will cause too many meaningless requests
    config.plugins.delete('prefetch');

    // set svg-sprite-loader
    config.module.rule('svg').exclude.add(resolve('src/icons')).end();
    config.module
      .rule('icons')
      .test(/\.svg$/)
      .include.add(resolve('src/icons'))
      .end()
      .use('svg-sprite-loader')
      .loader('svg-sprite-loader')
      .options({
        symbolId: 'icon-[name]',
      })
      .end();

    config.when(process.env.NODE_ENV !== 'development', (config) => {
      config
        .plugin('ScriptExtHtmlWebpackPlugin')
        .after('html')
        .use('script-ext-html-webpack-plugin', [
          {
            // `runtime` must same as runtimeChunk name. default is `runtime`
            inline: /runtime\..*\.js$/,
          },
        ])
        .end();
      config.optimization.splitChunks({
        chunks: 'all',
        cacheGroups: {
          libs: {
            name: 'chunk-libs',
            test: /[\\/]node_modules[\\/]/,
            priority: 10,
            chunks: 'initial', // only package third parties that are initially dependent
          },
          elementUI: {
            name: 'chunk-elementUI', // split elementUI into a single package
            priority: 20, // the weight needs to be larger than libs and app or it will be packaged into libs or app
            test: /[\\/]node_modules[\\/]_?element-ui(.*)/, // in order to adapt to cnpm
          },
          commons: {
            name: 'chunk-commons',
            test: resolve('src/components'), // can customize your rules
            minChunks: 3, //  minimum common number
            priority: 5,
            reuseExistingChunk: true,
          },
        },
      });
      // https:// webpack.js.org/configuration/optimization/#optimizationruntimechunk
      config.optimization.runtimeChunk('single');
    });
  },
};