events {
    worker_connections 1024;
}

http {
    upstream web {
        server web:3000;
    }

    upstream api {
        server api:3001;
    }

    # Rate limiting
    limit_req_zone $binary_remote_addr zone=api_limit:10m rate=10r/s;
    limit_req_zone $binary_remote_addr zone=web_limit:10m rate=30r/s;

    # Gzip compression
    gzip on;
    gzip_vary on;
    gzip_min_length 1024;
    gzip_proxied any;
    gzip_types text/plain text/css text/xml text/javascript application/javascript application/json application/xml;

    server {
        listen 80;
        server_name _;

        # Redirect HTTP to HTTPS in production
        # return 301 https://$server_name$request_uri;

        location / {
            limit_req zone=web_limit burst=20 nodelay;
            proxy_pass http://web;
            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_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
            proxy_set_header X-Forwarded-Proto $scheme;
            proxy_cache_bypass $http_upgrade;
        }

        location /api {
            limit_req zone=api_limit burst=10 nodelay;
            proxy_pass http://api;
            proxy_http_version 1.1;
            proxy_set_header Host $host;
            proxy_set_header X-Real-IP $remote_addr;
            proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
            proxy_set_header X-Forwarded-Proto $scheme;
        }

        # Health check endpoint
        location /health {
            access_log off;
            return 200 "OK";
            add_header Content-Type text/plain;
        }
    }

    # HTTPS server (uncomment for production with SSL)
    # server {
    #     listen 443 ssl http2;
    #     server_name your-domain.com;
    #
    #     ssl_certificate /etc/nginx/ssl/fullchain.pem;
    #     ssl_certificate_key /etc/nginx/ssl/privkey.pem;
    #     ssl_protocols TLSv1.2 TLSv1.3;
    #     ssl_ciphers HIGH:!aNULL:!MD5;
    #
    #     location / {
    #         proxy_pass http://web;
    #         # ... same as above
    #     }
    #
    #     location /api {
    #         proxy_pass http://api;
    #         # ... same as above
    #     }
    # }
}