events {
    worker_connections 1024;
}

http {
    # Rate limiting
    limit_req_zone $binary_remote_addr zone=api_limit:10m rate=10r/s;
    limit_req_zone $binary_remote_addr zone=admin_limit:10m rate=5r/s;

    # Upstream backends
    upstream api_backend {
        server backend:3000;
    }

    upstream admin_frontend {
        server frontend:80;
    }

    # Redirect HTTP to HTTPS (uncomment for production with SSL)
    # server {
    #     listen 80;
    #     server_name yourdomain.com;
    #     return 301 https://$server_name$request_uri;
    # }

    # API Server
    server {
        listen 80;
        # listen 443 ssl http2;  # Uncomment for HTTPS
        server_name api.yourdomain.com localhost;

        # SSL Configuration (uncomment and configure for production)
        # ssl_certificate /etc/nginx/ssl/cert.pem;
        # ssl_certificate_key /etc/nginx/ssl/key.pem;
        # ssl_protocols TLSv1.2 TLSv1.3;
        # ssl_ciphers HIGH:!aNULL:!MD5;

        # Security headers
        add_header X-Frame-Options "SAMEORIGIN" always;
        add_header X-Content-Type-Options "nosniff" always;
        add_header X-XSS-Protection "1; mode=block" always;
        add_header Referrer-Policy "no-referrer-when-downgrade" always;

        # Logging
        access_log /var/log/nginx/api_access.log;
        error_log /var/log/nginx/api_error.log;

        # API endpoints
        location /api/ {
            limit_req zone=api_limit burst=20 nodelay;

            proxy_pass http://api_backend;
            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;

            # Timeouts
            proxy_connect_timeout 60s;
            proxy_send_timeout 60s;
            proxy_read_timeout 60s;
        }

        location /ws/ {
            proxy_pass http://api_backend;
            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_read_timeout 3600s;
        }

        # Health check (no rate limit)
        location /health {
            proxy_pass http://api_backend;
            proxy_http_version 1.1;
            access_log off;
        }
    }

    # Admin Panel Server
    server {
        listen 80;
        # listen 443 ssl http2;  # Uncomment for HTTPS
        server_name admin.yourdomain.com localhost;

        # SSL Configuration (same as above)
        # ssl_certificate /etc/nginx/ssl/cert.pem;
        # ssl_certificate_key /etc/nginx/ssl/key.pem;

        # Security headers
        add_header X-Frame-Options "SAMEORIGIN" always;
        add_header X-Content-Type-Options "nosniff" always;
        add_header X-XSS-Protection "1; mode=block" always;

        # Logging
        access_log /var/log/nginx/admin_access.log;
        error_log /var/log/nginx/admin_error.log;

        location /api/ {
            limit_req zone=api_limit burst=20 nodelay;

            proxy_pass http://api_backend;
            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 /ws/ {
            proxy_pass http://api_backend;
            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_read_timeout 3600s;
        }

        location / {
            limit_req zone=admin_limit burst=10 nodelay;

            proxy_pass http://admin_frontend;
            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;
        }
    }

    # Default server (catch-all)
    server {
        listen 80 default_server;
        server_name _;
        return 444;  # Close connection without response
    }
}