import { defineConfig } from 'vite'
import react from '@vitejs/plugin-react'
import path from 'node:path'

export default defineConfig({
  plugins: [react()],
  resolve: {
    alias: {
      '@': path.resolve(__dirname, './src'),
    },
  },
  server: {
    host: '0.0.0.0',   // 允许局域网访问
    port: 3011,
    proxy: {
      // dev 时 /api 转发到 FastAPI
      '/api': {
        target: 'http://localhost:3018',
        // SSE 端点需要禁用缓冲
        configure: (proxy) => {
          proxy.on('proxyReq', (_proxyReq, req) => {
            if (req.url?.includes('/stream')) {
              _proxyReq.setHeader('Accept', 'text/event-stream')
              _proxyReq.setHeader('Cache-Control', 'no-cache')
              _proxyReq.setHeader('Connection', 'keep-alive')
            }
          })
        },
      },
      '/health': 'http://localhost:3018',
    },
  },
  build: {
    outDir: 'dist',
    sourcemap: false,
    rollupOptions: {
      output: {
        // 把重型图表库拆到独立 chunk, 避免打进主包 + 让页面按需加载。
        // 用函数形式按 node_modules 路径匹配, 比对象形式更可靠。
        manualChunks(id) {
          if (id.includes('node_modules')) {
            if (id.includes('echarts')) return 'echarts'
            if (id.includes('lightweight-charts')) return 'lightweight-charts'
          }
        },
      },
    },
  },
})