import { defineConfig, loadEnv } from 'vite';
import react from '@vitejs/plugin-react';

// 默认走 Go 后端 :4001；要回退 Node 后端就 set VITE_API_TARGET=http://localhost:4000
export default defineConfig(({ mode }) => {
  const env = loadEnv(mode, process.cwd(), '');
  const target = env.VITE_API_TARGET || 'http://localhost:4001';
  return {
    plugins: [react()],
    server: {
      port: 5173,
      proxy: {
        '/api': {
          target,
          changeOrigin: true,
          // SSE 不要被压缩；保持长连接
          configure: (proxy) => {
            proxy.on('proxyReq', (proxyReq) => {
              proxyReq.setHeader('Accept-Encoding', 'identity');
            });
          }
        }
      }
    }
  };
});