import { defineConfig } from 'vite';
import { tanstackStart } from '@tanstack/react-start/plugin/vite';
import { nitro } from 'nitro/vite';
import react from '@vitejs/plugin-react';
import tailwindcss from '@tailwindcss/vite';
import { fileURLToPath, URL } from 'node:url';

// Absolute origin for canonical and Open Graph URLs. Inlined at build time so
// the server render and the client agree on it. Vercel provides the production
// domain; set VITE_SITE_URL to override it anywhere.
const siteUrl =
  process.env.VITE_SITE_URL ??
  (process.env.VERCEL_PROJECT_PRODUCTION_URL
    ? `https://${process.env.VERCEL_PROJECT_PRODUCTION_URL}`
    : 'http://localhost:3000');

export default defineConfig({
  server: { port: 3000 },
  plugins: [
    // Start must come before the React plugin.
    tanstackStart(),
    // Builds the server for the host: Vercel's Build Output when deployed
    // there, a standalone Node server (.output/) everywhere else.
    nitro(),
    react(),
    tailwindcss(),
  ],
  define: {
    'import.meta.env.VITE_SITE_URL': JSON.stringify(siteUrl),
  },
  resolve: {
    alias: {
      '@': fileURLToPath(new URL('./src', import.meta.url)),
    },
  },
});