const path = require('path')
const webpack = require('webpack')
const { VueLoaderPlugin } = require('vue-loader')
const TerserPlugin = require('terser-webpack-plugin')

// 判断是否为开发环境
const isDev = process.env.NODE_ENV === 'development'

module.exports = {
  mode: 'production', // 明确指定生产模式
  target: 'web', // 明确指定浏览器环境
  entry: './src/index.js',
  devtool: isDev ? 'source-map' : false, // 开发环境生成 sourcemap
  output: {
    path: path.resolve(__dirname, 'dist'),
    filename: 'admin-framework.js',
    library: {
      name: 'AdminFramework', // 挂载到 window.AdminFramework
      type: 'umd',
      export: 'default'
    },
    globalObject: 'window', // 明确使用 window 对象
    umdNamedDefine: true, // 为 UMD 模块添加名称
    clean: true // 构建前清理 dist 目录
  },
  externals: {
    vue: {
      commonjs: 'vue',
      commonjs2: 'vue',
      amd: 'vue',
      root: 'Vue'
    },
    'vue-router': {
      commonjs: 'vue-router',
      commonjs2: 'vue-router',
      amd: 'vue-router',
      root: 'VueRouter'
    },
    vuex: {
      commonjs: 'vuex',
      commonjs2: 'vuex',
      amd: 'vuex',
      root: 'Vuex'
    },
    'view-design': {
      commonjs: 'view-design',
      commonjs2: 'view-design',
      amd: 'view-design',
      root: 'iview'
    },
    axios: {
      commonjs: 'axios',
      commonjs2: 'axios',
      amd: 'axios',
      root: 'axios'
    }
  },
  module: {
    rules: [
      {
        test: /\.vue$/,
        loader: 'vue-loader'
      },
      {
        test: /\.js$/,
        loader: 'babel-loader',
        exclude: /node_modules/,
        options: {
          presets: [
            [
              '@babel/preset-env',
              {
                modules: 'auto', // 修改为 auto，让 webpack 自动处理模块格式
                targets: {
                  browsers: ['>1%', 'last 2 versions', 'not ie <= 8']
                }
              }
            ],
            [
              '@vue/babel-preset-jsx',
              {
                injectH: true
              }
            ]
          ]
        }
      },
      {
        test: /\.css$/,
        use: [
          'vue-style-loader',
          'css-loader'
        ]
      },
      {
        test: /\.less$/,
        use: [
          'vue-style-loader',
          'css-loader',
          'less-loader'
        ]
      },
      {
        // 图片文件：全部转为 base64 内联到代码中
        test: /\.(png|jpe?g|gif|svg)(\?.*)?$/,
        loader: 'url-loader',
        options: {
          limit: 999999999, // 所有图片都转为 base64 内联（设置超大限制）
          esModule: false
        }
      },
      {
        // 字体文件：全部转为 base64 内联到代码中
        test: /\.(woff2?|eot|ttf|otf)(\?.*)?$/,
        loader: 'url-loader',
        options: {
          limit: 999999999, // 所有字体都转为 base64 内联
          esModule: false
        }
      },
      {
        // 媒体文件：全部转为 base64 内联到代码中
        test: /\.(mp4|webm|ogg|mp3|wav|flac|aac)(\?.*)?$/,
        loader: 'url-loader',
        options: {
          limit: 999999999, // 所有媒体文件都转为 base64 内联
          esModule: false
        }
      },
      {
        // JSON 文件：内联到代码中
        test: /\.json$/,
        type: 'asset/inline'
      },
      {
        // 其他资源文件：内联到代码中
        test: /\.(txt|xml|md)$/,
        type: 'asset/inline'
      }
    ]
  },
  plugins: [
    new VueLoaderPlugin(),
    new webpack.BannerPlugin({
      banner: () => {
        const now = new Date()
        const updateTime = `${now.getFullYear()}-${String(now.getMonth() + 1).padStart(2, '0')}-${String(now.getDate()).padStart(2, '0')} ${String(now.getHours()).padStart(2, '0')}:${String(now.getMinutes()).padStart(2, '0')}:${String(now.getSeconds()).padStart(2, '0')}`
        return [
          'admin-framework v1.0.0',
          '通用后台管理系统框架 - 包含系统功能、登录、路由管理、布局等',
          '',
          '作者: light',
          '更新时间: ' + updateTime,
          '',
          'Copyright (c) ' + now.getFullYear()
        ].join('\n')
      },
      entryOnly: true // 只在入口文件顶部添加
    })
  ],
  resolve: {
    extensions: ['.js', '.vue', '.json'],
    alias: {
      '@': path.resolve(__dirname, 'src'),
      '@component': path.resolve(__dirname, 'src/components'),
      '@utils': path.resolve(__dirname, 'src/utils'),
      '@api': path.resolve(__dirname, 'src/api'),
      '@config': path.resolve(__dirname, 'src/config'),
      '@assets': path.resolve(__dirname, 'src/assets'),
      'vue$': 'vue/dist/vue.esm.js'
    }
  },
  optimization: {
    minimize: !isDev, // 开发环境不压缩
    minimizer: [
      new TerserPlugin({
        terserOptions: {
          format: {
            comments: /^!|@preserve|@license|@cc_on|admin-framework|作者/i // 保留特殊注释
          }
        },
        extractComments: false // 不提取注释到单独文件
      })
    ]
  }
}