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

// https://vitejs.dev/config/
export default defineConfig({
  plugins: [react()],
  server: {
    proxy: {
      '/api': {
        target: 'http://backend:3000',
        changeOrigin: true,
      }
    }
  },
  build: {
    sourcemap: false,
    chunkSizeWarningLimit: 1500,
    // 'esnext' reduces CPU usage by avoiding heavy transpilation for older browsers
    target: 'esnext',
    rollupOptions: {
      output: {
        manualChunks: (id) => {
          if (id.includes('node_modules')) {
            if (id.includes('react-markdown') || id.includes('remark') || id.includes('rehype')) {
              return 'markdown';
            }
            if (id.includes('lucide-react')) {
              return 'icons';
            }
            if (id.includes('@google/genai')) {
              return 'genai';
            }
            if (id.includes('react') || id.includes('react-dom')) {
              return 'react-vendor';
            }
            return 'vendor';
          }
        }
      }
    }
  }
});