const path = require('path');
const HtmlWebpackPlugin = require('html-webpack-plugin');
const webpack = require('webpack');
const TerserPlugin = require('terser-webpack-plugin');

// 端口从环境变量读取，默认 3015（沙箱固定端口）
const DEV_PORT = parseInt(process.env.DEV_PORT || '3015', 10);

module.exports = (env, argv) => {
  const isDev = argv.mode !== 'production';

  return {
    mode: isDev ? 'development' : 'production',
    entry: './src/index.tsx',
    output: {
      path: path.resolve(__dirname, 'dist'),
      filename: isDev ? '[name].js' : '[name].[contenthash:8].js',
      chunkFilename: isDev ? '[name].chunk.js' : '[name].[contenthash:8].chunk.js',
      publicPath: '/',
      clean: true,
    },
    optimization: {
      minimize: !isDev,
      minimizer: [
        new TerserPlugin({
          terserOptions: {
            compress: {
              drop_console: true,
              drop_debugger: true,
            },
            format: {
              comments: false,
            },
          },
          extractComments: false,
        }),
      ],
      splitChunks: {
        chunks: 'all',
        cacheGroups: {
          vendor: {
            test: /[\\/]node_modules[\\/]/,
            name: 'vendors',
            chunks: 'all',
          },
        },
      },
    },
    module: {
      rules: [
        {
          test: /\.mjs$/,
          include: /node_modules/,
          type: 'javascript/auto',
          resolve: {
            fullySpecified: false,
          },
        },
        {
          test: /\.(ts|tsx|js|jsx)$/,
          exclude: /node_modules/,
          use: {
            loader: 'babel-loader',
            options: {
              presets: [
                ['@babel/preset-react', { runtime: 'automatic', development: isDev }],
                '@babel/preset-env',
                '@babel/preset-typescript'
              ]
            }
          }
        },
        {
          test: /\.css$/,
          use: ['style-loader', 'css-loader', 'postcss-loader']
        },
        {
          test: /\.(png|jpe?g|gif|webp|svg)$/i,
          type: 'asset',
          parser: { dataUrlCondition: { maxSize: 1024 * 1024 } }
        },
        {
          exclude: /\.(js|jsx|ts|tsx|mjs|css|json|html)$/i,
          type: 'asset/resource'
        }
      ]
    },
    resolve: {
      extensions: ['.mjs', '.ts', '.tsx', '.js', '.jsx']
    },
    devServer: {
      port: DEV_PORT,
      host: '0.0.0.0',
      allowedHosts: 'all',
      hot: true,
      historyApiFallback: true,
      proxy: [
        {
          context: ['/api', '/ws'],
          target: `http://localhost:${process.env.GATEWAY_PORT || '8080'}`,
          ws: true,
          changeOrigin: true,
        },
      ],
    },
    plugins: [
      new HtmlWebpackPlugin({
        template: './index.html',
        inject: 'body',
      }),
      new webpack.DefinePlugin({
        'process.env.NODE_ENV': JSON.stringify(isDev ? 'development' : 'production'),
        '__APP_ENV__': JSON.stringify(isDev ? 'development' : 'production'),
      }),
    ],
  };
};