user nginx;
worker_processes auto;
error_log /var/log/nginx/error.log warn;
pid /var/run/nginx.pid;

events {
    worker_connections 4096;  # Alta capacidad de conexiones concurrentes
    use epoll;  # Mejor rendimiento en Linux
}

http {
    include /etc/nginx/mime.types;
    default_type application/octet-stream;

    log_format main '$remote_addr - $remote_user [$time_local] "$request" '
                    '$status $body_bytes_sent "$http_referer" '
                    '"$http_user_agent" "$http_x_forwarded_for"';

    access_log /var/log/nginx/access.log main;

    # Optimizaciones de rendimiento
    sendfile on;
    tcp_nopush on;
    tcp_nodelay on;
    keepalive_timeout 65;
    types_hash_max_size 2048;
    client_max_body_size 1000M;

    # Compresión gzip para reducir ancho de banda
    gzip on;
    gzip_vary on;
    gzip_proxied any;
    gzip_comp_level 6;
    gzip_types text/plain text/css text/xml text/javascript 
               application/json application/javascript application/xml+rss 
               application/atom+xml image/svg+xml;
    gzip_disable "msie6";

    # Cache de archivos estáticos
    open_file_cache max=1000 inactive=20s;
    open_file_cache_valid 30s;
    open_file_cache_min_uses 2;
    open_file_cache_errors on;

    # Configuración upstream para Gunicorn
    upstream gunicorn_backend {
        server rss2_web:8000 max_fails=3 fail_timeout=30s;
        keepalive 32;
    }

    server {
        listen 80;
        server_name _;

        # Logs específicos
        access_log /var/log/nginx/rss2_access.log main;
        error_log /var/log/nginx/rss2_error.log warn;

        # Límites de seguridad
        client_body_timeout 60s;
        client_header_timeout 60s;
        send_timeout 300s;

        # Servir archivos estáticos directamente desde NGINX
        location /static/ {
            alias /app/static/;
            expires 7d;
            add_header Cache-Control "no-cache, must-revalidate";
            access_log on;
        }

        # Proxy pass a Gunicorn para todo lo demás
        location / {
            proxy_pass http://gunicorn_backend;
            proxy_redirect off;
            
            # Headers necesarios
            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;
            
            # Timeouts para queries lentas
            proxy_connect_timeout 60s;
            proxy_send_timeout 300s;
            proxy_read_timeout 300s;
            
            # Buffering
            proxy_buffering on;
            proxy_buffer_size 4k;
            proxy_buffers 8 4k;
            proxy_busy_buffers_size 8k;
            
            # HTTP/1.1 para keepalive
            proxy_http_version 1.1;
            proxy_set_header Connection "";
        }

        # Health check endpoint
        location /health {
            access_log off;
            proxy_pass http://gunicorn_backend;
        }

        # Bloquear acceso a archivos sensibles
        location ~ /\. {
            deny all;
            access_log off;
            log_not_found off;
        }
    }
}