import { defineConfig, loadEnv } from 'vite';
import react from '@vitejs/plugin-react';
import tailwindcss from '@tailwindcss/vite';
import { energyDevMockApi } from './src/modules/energy/hydrogen/dev-mock-api';

export default defineConfig(({ mode }) => {
  const env = loadEnv(mode, process.cwd(), '');

  return {
    plugins: [
      react(),
      tailwindcss(),
      ...(env.DEV_MOCK_API === '1' ? [energyDevMockApi()] : []),
    ],
    server: {
      allowedHosts: ['biz.u2145933.nyat.app'],
      proxy: {
        '/api': {
          target: 'http://localhost:3001',
          changeOrigin: true,
          configure(proxy) {
            // A failed upstream BI aggregation must become an HTTP error for
            // the UI fallback, never terminate the 8115 preview process.
            proxy.on('error', (_error, _request, response) => {
              if (response && 'writeHead' in response && !response.headersSent) {
                response.writeHead(502, { 'Content-Type': 'text/plain; charset=utf-8' });
                response.end('Upstream API temporarily unavailable');
              }
            });
          },
        },
      },
    },
  };
});