events {
    worker_connections 1024;
}

http {
    upstream deepcoder_backend {
        server deepcoder-api:8000;
    }
    
    # Rate limiting
    limit_req_zone $binary_remote_addr zone=api:10m rate=10r/m;
    
    server {
        listen 80;
        server_name localhost;
        
        # Security headers
        add_header X-Frame-Options DENY;
        add_header X-Content-Type-Options nosniff;
        add_header X-XSS-Protection "1; mode=block";
        
        # Increase client max body size for large code submissions
        client_max_body_size 10M;
        
        # Timeouts for long-running generation requests
        proxy_connect_timeout 60s;
        proxy_send_timeout 300s;
        proxy_read_timeout 300s;
        
        location / {
            proxy_pass http://deepcoder_backend;
            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;
        }
        
        location /generate {
            limit_req zone=api burst=5 nodelay;
            proxy_pass http://deepcoder_backend;
            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;
        }
        
        location /health {
            proxy_pass http://deepcoder_backend;
            access_log off;
        }
    }
}