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

// https://vitejs.dev/config/
export default defineConfig(({ mode }) => {
  const env = loadEnv(mode, process.cwd(), '');
  const aiBaseUrl = (env.VITE_OPENAI_BASE_URL || 'https://openrouter.ai/api/v1').replace(/\/$/, '');

  let proxyTarget = 'https://openrouter.ai';
  let proxyPathPrefix = '/api/v1';
  try {
    const parsed = new URL(aiBaseUrl);
    proxyTarget = parsed.origin;
    proxyPathPrefix = parsed.pathname.replace(/\/$/, '') || '';
  } catch {
    // keep defaults
  }

  return {
    plugins: [
      react(),
      VitePWA({
        registerType: 'autoUpdate',
        includeAssets: [
          'favicon.ico',
          'favicon-16x16.png',
          'favicon-32x32.png',
          'apple-touch-icon.png',
          'logo/mainlogo.png',
        ],
        manifest: {
          name: 'نویا',
          short_name: 'نویا',
          description: 'پلتفرم روان‌شناسی و سلامت روان نویا',
          theme_color: '#0a0f1d',
          background_color: '#070b14',
          display: 'standalone',
          orientation: 'portrait',
          scope: '/',
          start_url: '/',
          dir: 'rtl',
          lang: 'fa',
          icons: [
            {
              src: 'pwa-192x192.png',
              sizes: '192x192',
              type: 'image/png'
            },
            {
              src: 'pwa-512x512.png',
              sizes: '512x512',
              type: 'image/png'
            },
            {
              src: 'pwa-512x512.png',
              sizes: '512x512',
              type: 'image/png',
              purpose: 'any maskable'
            }
          ]
        },
        workbox: {
          globPatterns: ['**/*.{js,css,html,ico,png,svg,woff2}']
        }
      })
    ],
    resolve: {
      alias: {
        '@': path.resolve(__dirname, './src')
      }
    },
    server: {
      proxy: {
        // Browser → Vite → local Backend (avoids CORS on localhost)
        '/api/backend': {
          target: 'http://localhost:3001',
          changeOrigin: true,
          rewrite: (requestPath) => requestPath.replace(/^\/api\/backend/, ''),
        },
        // Browser → Vite → OpenRouter (avoids CORS / blocked browser routes on LAN)
        '/api/ai': {
          target: proxyTarget,
          changeOrigin: true,
          secure: true,
          timeout: 180_000,
          proxyTimeout: 180_000,
          rewrite: (requestPath) => requestPath.replace(/^\/api\/ai/, proxyPathPrefix),
          configure: (proxy) => {
            proxy.on('proxyReq', (proxyReq, req) => {
              // Avoid forwarding browser Origin; set stable OpenRouter attribution headers
              proxyReq.removeHeader('origin');
              proxyReq.setHeader('HTTP-Referer', 'https://novya.app');
              proxyReq.setHeader('X-Title', 'Novya');
              if (!proxyReq.getHeader('user-agent')) {
                proxyReq.setHeader(
                  'User-Agent',
                  'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/122.0.0.0 Safari/537.36'
                );
              }
              // NOTE: do NOT use import.meta.env here — undefined in Node proxy callbacks
              console.log('[AI Proxy]', req.method, req.url, '→', proxyTarget + proxyPathPrefix);
            });
            proxy.on('error', (err, _req, res) => {
              console.error('[AI Proxy] Error:', err.message);
              const socket = res as {
                headersSent?: boolean;
                writeHead?: (code: number, headers: Record<string, string>) => void;
                end?: (body: string) => void;
              };
              if (socket && !socket.headersSent && typeof socket.writeHead === 'function') {
                socket.writeHead(502, { 'Content-Type': 'application/json' });
                socket.end?.(
                  JSON.stringify({
                    error: 'AI proxy error',
                    message: String(err.message || err)
                  })
                );
              }
            });
          }
        }
      }
    }
  };
});