let path = require('path');
const webpack = require('webpack');
const ThemeColorReplacer = require('webpack-theme-color-replacer');
const { getThemeColors, modifyVars } = require('./src/utils/themeUtil');
const { resolveCss } = require('./src/utils/theme-color-replacer-extend');
const CompressionWebpackPlugin = require('compression-webpack-plugin');

const productionGzipExtensions = ['js', 'css'];
const isProd = process.env.NODE_ENV === 'production';

function resolve(dir) {
  return path.join(__dirname, dir);
}
const assetsCDN = {
  // webpack build externals
  externals: {
    vue: 'Vue',
    'vue-router': 'VueRouter',
    vuex: 'Vuex',
    axios: 'axios',
    nprogress: 'NProgress',
    clipboard: 'ClipboardJS',
    '@antv/data-set': 'DataSet',
    'js-cookie': 'Cookies',
  },
  css: [],
  js: [
    '//cdn.jsdelivr.net/npm/vue@2.6.11/dist/vue.min.js',
    '//cdn.jsdelivr.net/npm/vue-router@3.3.4/dist/vue-router.min.js',
    '//cdn.jsdelivr.net/npm/vuex@3.4.0/dist/vuex.min.js',
    '//cdn.jsdelivr.net/npm/axios@0.19.2/dist/axios.min.js',
    '//cdn.jsdelivr.net/npm/nprogress@0.2.0/nprogress.min.js',
    '//cdn.jsdelivr.net/npm/clipboard@2.0.6/dist/clipboard.min.js',
    '//cdn.jsdelivr.net/npm/@antv/data-set@0.11.4/build/data-set.min.js',
    '//cdn.jsdelivr.net/npm/js-cookie@2.2.1/src/js.cookie.min.js',
  ],
};

// 为匹配符合命名规则的API_*_BASE_URL环境变量动态生成proxy规则
const proxyConfig = Object.entries(process.env)
  .filter(([key]) => key.match(/^VUE_APP_API_(.+_)?BASE_URL$/))
  .reduce((obj, [_, target]) => ({
    ...obj,
    [`${process.env.VUE_APP_API_DEV_SERVER_PROXY_BASE}/${target}`]: {
      target: target,
      changeOrigin: true,
      pathRewrite: {
        '^/proxy/': ''
      },
      logLevel: 'debug',
    }
  }), {});

module.exports = {
  devServer: {
    port: 8082, // 端口号
    proxy: {
      ...proxyConfig,
      '/ids': {
        target: 'http://localhost:44339',
        changeOrigin: true,
        pathRewrite: {
          '^/ids': ''
        },
        logLevel: 'debug',
      },
      '/api': {
        target: 'http://localhost:44354',
        changeOrigin: true,
        pathRewrite: {},
        logLevel: 'debug',
      }
    }
  },
  pluginOptions: {
    'style-resources-loader': {
      preProcessor: 'less',
      patterns: [path.resolve(__dirname, './src/theme/theme.less')],
    },
  },
  configureWebpack: (config) => {
    config.entry.app = ['babel-polyfill', 'whatwg-fetch', './src/main.js'];
    config.performance = {
      hints: false,
    };
    config.plugins.push(
      new ThemeColorReplacer({
        fileName: 'css/theme-colors-[contenthash:8].css',
        matchColors: getThemeColors(),
        injectCss: true,
        resolveCss,
      })
    );
    // Ignore all locale files of moment.js
    config.plugins.push(new webpack.IgnorePlugin(/^\.\/locale$/, /moment$/));
    // 生产环境下将资源压缩成gzip格式
    if (isProd) {
      // add `CompressionWebpack` plugin to webpack plugins
      config.plugins.push(
        new CompressionWebpackPlugin({
          algorithm: 'gzip',
          test: new RegExp('\\.(' + productionGzipExtensions.join('|') + ')$'),
          threshold: 10240,
          minRatio: 0.8,
        })
      );
    }
    // if prod, add externals
    // if (isProd) {
    //     config.externals = assetsCDN.externals
    // }
  },
  chainWebpack: (config) => {
    config.resolve.alias
      .set('@', resolve('src'))
      .set('static', resolve('public/static'))
      .set('assets', resolve('src/assets'))
      .set('components', resolve('src/components'))
      .set('router', resolve('src/router'))
      .set('store', resolve('src/store'))
      .set('views', resolve('src/views'));
    // 生产环境下关闭css压缩的 colormin 项，因为此项优化与主题色替换功能冲突
    if (isProd) {
      config.plugin('optimize-css').tap((args) => {
        args[0].cssnanoOptions.preset[1].colormin = false;
        return args;
      });
    }
    // 生产环境下使用CDN
    // if (isProd) {
    //     config.plugin('html')
    //         .tap(args => {
    //             args[0].cdn = assetsCDN
    //             return args
    //         })
    // }
  },
  css: {
    loaderOptions: {
      less: {
        lessOptions: {
          modifyVars: modifyVars(),
          javascriptEnabled: true,
        },
      },
    },
  },
  publicPath: process.env.NODE_ENV === 'production' ? '/' : '/',
  outputDir: 'dist',
  assetsDir: 'static',
  productionSourceMap: false,
};