import { defineConfig } from 'vite'
import vue from '@vitejs/plugin-vue'
import path from 'path'
import { visualizer } from 'rollup-plugin-visualizer'
import viteCompression from 'vite-plugin-compression'
import viteImagemin from 'vite-plugin-imagemin'
import Components from 'unplugin-vue-components/vite'
import { ElementPlusResolver } from 'unplugin-vue-components/resolvers'
import AutoImport from 'unplugin-auto-import/vite'

export default defineConfig({
  plugins: [
    vue(),
    
    // Auto import components
    Components({
      resolvers: [ElementPlusResolver()],
      dts: 'src/components.d.ts'
    }),
    
    // Auto import APIs
    AutoImport({
      imports: ['vue', 'vue-router', 'pinia'],
      dts: 'src/auto-imports.d.ts',
      resolvers: [ElementPlusResolver()]
    }),
    
    // Gzip compression
    viteCompression({
      verbose: true,
      disable: false,
      threshold: 10240,
      algorithm: 'gzip',
      ext: '.gz'
    }),
    
    // Brotli compression
    viteCompression({
      verbose: true,
      disable: false,
      threshold: 10240,
      algorithm: 'brotliCompress',
      ext: '.br'
    }),
    
    // Image optimization
    viteImagemin({
      gifsicle: {
        optimizationLevel: 7,
        interlaced: false
      },
      optipng: {
        optimizationLevel: 7
      },
      mozjpeg: {
        quality: 80
      },
      pngquant: {
        quality: [0.8, 0.9],
        speed: 4
      },
      svgo: {
        plugins: [
          {
            name: 'removeViewBox'
          },
          {
            name: 'removeEmptyAttrs',
            active: false
          }
        ]
      }
    }),
    
    // Bundle analyzer
    visualizer({
      open: true,
      gzipSize: true,
      brotliSize: true,
      filename: 'dist/bundle-analysis.html'
    })
  ],
  
  resolve: {
    alias: {
      '@': path.resolve(__dirname, './src'),
      '~': path.resolve(__dirname, './src/assets')
    }
  },
  
  server: {
    port: 3008,
    host: '0.0.0.0',
    proxy: {
      '/api': {
        target: 'http://localhost:3030',
        changeOrigin: true
      },
      '/socket.io': {
        target: 'http://localhost:3030',
        ws: true,
        changeOrigin: true
      }
    }
  },
  
  build: {
    target: 'es2015',
    outDir: 'dist',
    assetsDir: 'assets',
    sourcemap: false,
    minify: 'terser',
    terserOptions: {
      compress: {
        drop_console: true,
        drop_debugger: true
      }
    },
    rollupOptions: {
      output: {
        // Manual chunks for better caching
        manualChunks: {
          'element-plus': ['element-plus', '@element-plus/icons-vue'],
          'chart': ['chart.js', 'vue-chartjs'],
          'vendor': ['vue', 'vue-router', 'pinia'],
          'utils': ['axios', 'dayjs', 'lodash-es'],
          'i18n': ['vue-i18n']
        },
        // Asset naming for better caching
        chunkFileNames: (chunkInfo) => {
          const facadeModuleId = chunkInfo.facadeModuleId ? chunkInfo.facadeModuleId.split('/').pop() : 'chunk'
          return `js/[name]-${facadeModuleId}-[hash].js`
        },
        entryFileNames: 'js/[name]-[hash].js',
        assetFileNames: (assetInfo) => {
          const info = assetInfo.name.split('.')
          const ext = info[info.length - 1]
          if (/png|jpe?g|svg|gif|tiff|bmp|ico/i.test(ext)) {
            return `images/[name]-[hash][extname]`
          } else if (/woff|woff2|eot|ttf|otf/i.test(ext)) {
            return `fonts/[name]-[hash][extname]`
          } else {
            return `[ext]/[name]-[hash][extname]`
          }
        }
      }
    },
    // Chunk size warnings
    chunkSizeWarningLimit: 500,
    // CSS code splitting
    cssCodeSplit: true,
    // Asset inlining threshold
    assetsInlineLimit: 4096
  },
  
  css: {
    preprocessorOptions: {
      scss: {
        additionalData: `@import "@/styles/variables.scss";`
      }
    },
    // Extract CSS for better caching
    extract: true,
    // CSS modules
    modules: {
      localsConvention: 'camelCase'
    }
  },
  
  optimizeDeps: {
    include: [
      'vue',
      'vue-router',
      'pinia',
      'axios',
      'element-plus',
      'dayjs',
      'lodash-es'
    ],
    exclude: ['@vueuse/core']
  },
  
  // Performance optimizations
  esbuild: {
    pure: ['console.log', 'console.debug'],
    legalComments: 'none'
  }
})