vite.config.ts

import tailwindcss from '@tailwindcss/vite';
import react from '@vitejs/plugin-react';
import path from 'path';
import fs from 'fs';
import {defineConfig, loadEnv, type Plugin} from 'vite';

// Copy index.html → 404.html for GitHub Pages SPA routing
function spa404Plugin(): Plugin {
  return {
    name: 'spa-404',
    closeBundle() {
      const dist = path.resolve(__dirname, 'dist');
      const index = path.join(dist, 'index.html');
      const four04 = path.join(dist, '404.html');
      if (fs.existsSync(index)) {
        fs.copyFileSync(index, four04);
      }
    },
  };
}

export default defineConfig(({mode}) => {
  const env = loadEnv(mode, '.', '');
  return {
    base: mode === 'production' ? '/portfolio-v2/' : '/',
    plugins: [react(), tailwindcss(), spa404Plugin()],
    define: {
      'process.env.GEMINI_API_KEY': JSON.stringify(env.GEMINI_API_KEY),
    },
    resolve: {
      alias: {
        '@': path.resolve(__dirname, '.'),
      },
    },
    server: {
      // HMR is disabled in AI Studio via DISABLE_HMR env var.
      // Do not modify—file watching is disabled to prevent flickering during agent edits.
      hmr: process.env.DISABLE_HMR !== 'true',
    },
  };
});