import { defineConfig, loadEnv } from 'vite'
import vue from '@vitejs/plugin-vue'
import viteCompression from 'vite-plugin-compression'
import { viteMockServe } from 'vite-plugin-mock'
import { fileURLToPath, URL } from 'url'

// https://vitejs.dev/guide/env-and-mode.html#env-files
export default defineConfig(({ mode, command }) => {
  const env = loadEnv(mode, process.cwd())
  return {
    plugins: [
      vue(),
      // gzip 压缩
      viteCompression(),
      // 本地 mock 服务（仅 dev 启用，prod 不引入）
      viteMockServe({
        mockPath: 'mock',
        localEnabled: command === 'serve',
      }),
    ],
    base: env.VITE_RES_URL,
    resolve: {
      alias: {
        '@': fileURLToPath(new URL('./src', import.meta.url))
      }
    },
    css: {
      preprocessorOptions: {
        scss: {
          additionalData: `@use "@/style/mixin.scss" as *;`
        }
      }
    },
    build: {
      // 拆 chunk，减少首屏加载
      rollupOptions: {
        output: {
          manualChunks: {
            'vendor-vue': ['vue', 'vue-router', 'pinia'],
            'vendor-ui': ['element-plus', '@element-plus/icons-vue'],
            'vendor-chart': ['echarts'],
          }
        }
      }
    }
  }
})