apiVersion: v1
kind: ConfigMap
metadata:
  name: frontend-nginx-config
  labels:
    app.kubernetes.io/name: frontend
    app.kubernetes.io/component: web
data:
  default.conf: |
    server {
        listen 80;
        server_name localhost;

        root /usr/share/nginx/html;
        index index.html;

        # Proxy API requests to backend service
        location /api/ {
            proxy_pass http://backend:3001;
            proxy_http_version 1.1;
            proxy_set_header Upgrade $http_upgrade;
            proxy_set_header Connection 'upgrade';
            proxy_set_header Host $host;
            proxy_cache_bypass $http_upgrade;
            proxy_read_timeout 60s;
        }

        # Proxy Socket.io (real-time notifications)
        location /socket.io/ {
            proxy_pass http://backend:3001;
            proxy_http_version 1.1;
            proxy_set_header Upgrade $http_upgrade;
            proxy_set_header Connection "upgrade";
            proxy_set_header Host $host;
            proxy_set_header X-Real-IP $remote_addr;
            proxy_cache_bypass $http_upgrade;
            proxy_read_timeout 3600s;
        }

        # Serve static files — React SPA catch-all
        location / {
            try_files $uri $uri/ /index.html;
        }
    }