const path = require('path');
const webpack = require('webpack');
const { BundleAnalyzerPlugin } = process.env.ANALYZE ? require('webpack-bundle-analyzer') : { BundleAnalyzerPlugin: null };

module.exports = {
  webpack: {
    configure: (webpackConfig, { env, paths }) => {
      // ============== 持久化缓存配置 ==============
      // 大幅提升二次构建速度（可提升 50-80%）
      webpackConfig.cache = {
        type: 'filesystem',
        cacheDirectory: path.resolve(__dirname, 'node_modules/.cache/webpack'),
        buildDependencies: {
          config: [__filename],
        },
        // 增加缓存有效性检查
        name: env === 'production' ? 'production' : 'development',
        compression: env === 'production' ? 'gzip' : false,
      };

      // ============== 生产环境优化 ==============
      if (env === 'production') {
        // 高级代码分割策略
        webpackConfig.optimization = {
          ...webpackConfig.optimization,
          splitChunks: {
            chunks: 'all',
            maxInitialRequests: 30,
            minSize: 20000,
            maxSize: 244000, // 限制单个 chunk 最大大小（约 244KB）
            cacheGroups: {
              // React 核心库单独分离
              react: {
                test: /[\\/]node_modules[\\/](react|react-dom|react-router-dom)[\\/]/,
                name: 'react-vendor',
                priority: 30,
                reuseExistingChunk: true,
              },
              // 大型图表库分离（echarts, d3, apexcharts 等）
              charts: {
                test: /[\\/]node_modules[\\/](echarts|echarts-for-react|apexcharts|react-apexcharts|recharts|d3|d3-.*)[\\/]/,
                name: 'charts-lib',
                priority: 25,
                reuseExistingChunk: true,
              },
              // Chakra UI 框架
              chakraUI: {
                test: /[\\/]node_modules[\\/](@chakra-ui|@emotion)[\\/]/,
                name: 'chakra-ui',
                priority: 22,
                reuseExistingChunk: true,
              },
              // Ant Design
              antd: {
                test: /[\\/]node_modules[\\/](antd|@ant-design)[\\/]/,
                name: 'antd-lib',
                priority: 22,
                reuseExistingChunk: true,
              },
              // 3D 库（three.js）
              three: {
                test: /[\\/]node_modules[\\/](three|@react-three)[\\/]/,
                name: 'three-lib',
                priority: 20,
                reuseExistingChunk: true,
              },
              // 日期/日历库
              calendar: {
                test: /[\\/]node_modules[\\/](moment|date-fns|@fullcalendar|react-big-calendar)[\\/]/,
                name: 'calendar-lib',
                priority: 18,
                reuseExistingChunk: true,
              },
              // 其他第三方库
              vendor: {
                test: /[\\/]node_modules[\\/]/,
                name: 'vendors',
                priority: 10,
                reuseExistingChunk: true,
              },
              // 公共代码
              common: {
                minChunks: 2,
                priority: 5,
                reuseExistingChunk: true,
                name: 'common',
              },
            },
          },
          // 优化运行时代码
          runtimeChunk: 'single',
          // 使用确定性的模块 ID
          moduleIds: 'deterministic',
          // 最小化配置
          minimize: true,
        };

        // 生产环境禁用 source map 以加快构建（可节省 40-60% 时间）
        webpackConfig.devtool = false;
      } else {
        // 开发环境使用更快的 source map
        webpackConfig.devtool = 'eval-cheap-module-source-map';
      }

      // ============== 模块解析优化 ==============
      webpackConfig.resolve = {
        ...webpackConfig.resolve,
        alias: {
          ...webpackConfig.resolve.alias,
          // 根目录别名
          '@': path.resolve(__dirname, 'src'),

          // 功能模块别名（按字母顺序）
          '@assets': path.resolve(__dirname, 'src/assets'),
          '@components': path.resolve(__dirname, 'src/components'),
          '@constants': path.resolve(__dirname, 'src/constants'),
          '@contexts': path.resolve(__dirname, 'src/contexts'),
          '@data': path.resolve(__dirname, 'src/data'),
          '@hooks': path.resolve(__dirname, 'src/hooks'),
          '@layouts': path.resolve(__dirname, 'src/layouts'),
          '@lib': path.resolve(__dirname, 'src/lib'),
          '@mocks': path.resolve(__dirname, 'src/mocks'),
          '@providers': path.resolve(__dirname, 'src/providers'),
          '@routes': path.resolve(__dirname, 'src/routes'),
          '@services': path.resolve(__dirname, 'src/services'),
          '@store': path.resolve(__dirname, 'src/store'),
          '@styles': path.resolve(__dirname, 'src/styles'),
          '@theme': path.resolve(__dirname, 'src/theme'),
          '@utils': path.resolve(__dirname, 'src/utils'),
          '@variables': path.resolve(__dirname, 'src/variables'),
          '@views': path.resolve(__dirname, 'src/views'),
        },
        // 减少文件扩展名搜索
        extensions: ['.js', '.jsx', '.json'],
        // 优化模块查找路径
        modules: [
          path.resolve(__dirname, 'src'),
          'node_modules'
        ],
        // 优化符号链接解析
        symlinks: false,
      };

      // ============== 插件优化 ==============
      // 移除 ESLint 插件以提升构建速度（可提升 20-30%）
      webpackConfig.plugins = webpackConfig.plugins.filter(
        plugin => plugin.constructor.name !== 'ESLintWebpackPlugin'
      );

      // 添加打包分析工具（通过 ANALYZE=true 启用）
      if (env === 'production' && process.env.ANALYZE && BundleAnalyzerPlugin) {
        webpackConfig.plugins.push(
          new BundleAnalyzerPlugin({
            analyzerMode: 'static',
            openAnalyzer: true,
            reportFilename: 'bundle-report.html',
          })
        );
      }

      // 忽略 moment 的语言包（如果项目使用了 moment）
      webpackConfig.plugins.push(
        new webpack.IgnorePlugin({
          resourceRegExp: /^\.\/locale$/,
          contextRegExp: /moment$/,
        })
      );

      // ============== Loader 优化 ==============
      const babelLoaderRule = webpackConfig.module.rules.find(
        rule => rule.oneOf
      );

      if (babelLoaderRule && babelLoaderRule.oneOf) {
        babelLoaderRule.oneOf.forEach(rule => {
          // 优化 Babel Loader
          if (rule.loader && rule.loader.includes('babel-loader')) {
            rule.options = {
              ...rule.options,
              cacheDirectory: true,
              cacheCompression: false,
              compact: env === 'production',
            };
            // 限制 Babel 处理范围
            rule.include = path.resolve(__dirname, 'src');
            rule.exclude = /node_modules/;
          }

          // 优化 CSS Loader
          if (rule.use && Array.isArray(rule.use)) {
            rule.use.forEach(loader => {
              if (loader.loader && loader.loader.includes('css-loader') && loader.options) {
                loader.options.sourceMap = env !== 'production';
              }
            });
          }
        });
      }

      // ============== 性能提示配置 ==============
      webpackConfig.performance = {
        hints: env === 'production' ? 'warning' : false,
        maxEntrypointSize: 512000, // 512KB
        maxAssetSize: 512000,
      };

      return webpackConfig;
    },
  },

  // ============== Babel 配置优化 ==============
  babel: {
    plugins: [
      // 运行时辅助函数复用
      ['@babel/plugin-transform-runtime', {
        regenerator: true,
        useESModules: true,
      }],
    ],
    loaderOptions: {
      cacheDirectory: true,
      cacheCompression: false,
    },
  },

  // ============== 开发服务器配置 ==============
  devServer: {
    hot: true,
    port: 3000,
    compress: true,
    client: {
      overlay: false,
      progress: true,
    },
    // 优化开发服务器性能
    devMiddleware: {
      writeToDisk: false,
    },
    // 代理配置：将 /api 请求代理到后端服务器
    proxy: {
      '/api': {
        target: 'http://49.232.185.254:5001',
        changeOrigin: true,
        secure: false,
        logLevel: 'debug',
      },
    },
  },
};