events {
    worker_connections 1024;
}

http {
    upstream web {
        server web:8000;
    }

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

    # MIME types
    include       /etc/nginx/mime.types;
    default_type  application/octet-stream;

    # Security headers
    add_header X-Frame-Options DENY always;
    add_header X-Content-Type-Options nosniff always;
    add_header X-XSS-Protection "1; mode=block" always;
    add_header Strict-Transport-Security "max-age=31536000; includeSubDomains; preload" always;

    # Logging
    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;
    error_log /var/log/nginx/error.log warn;

    # Gzip compression
    gzip on;
    gzip_vary on;
    gzip_min_length 1024;
    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;

    # HTTP to HTTPS redirect
    server {
        listen 80;
        server_name ai.quantumtaskai.com;
        return 301 https://$server_name$request_uri;
    }

    # HTTPS server
    server {
        listen 443 ssl http2;
        server_name ai.quantumtaskai.com;

        # SSL configuration
        ssl_certificate /etc/letsencrypt/live/ai.quantumtaskai.com/fullchain.pem;
        ssl_certificate_key /etc/letsencrypt/live/ai.quantumtaskai.com/privkey.pem;
        
        # SSL security settings
        ssl_protocols TLSv1.2 TLSv1.3;
        ssl_ciphers ECDHE-RSA-AES128-GCM-SHA256:ECDHE-RSA-AES256-GCM-SHA384;
        ssl_prefer_server_ciphers off;
        ssl_session_cache shared:SSL:10m;
        ssl_session_timeout 10m;

        # Security headers specific to HTTPS
        add_header Strict-Transport-Security "max-age=31536000; includeSubDomains; preload" always;

        # Client max body size
        client_max_body_size 100M;

        # Static files
        location /static/ {
            alias /var/www/static/;
            expires 1y;
            add_header Cache-Control "public, immutable";
        }

        # Media files
        location /media/ {
            alias /var/www/media/;
            expires 1y;
            add_header Cache-Control "public";
        }

        # API endpoints with higher rate limit
        location /api/ {
            limit_req zone=api burst=10 nodelay;
            proxy_pass http://web;
            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_redirect off;
        }

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

        # Main application
        location / {
            limit_req zone=web burst=5 nodelay;
            proxy_pass http://web;
            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_redirect off;
            
            # Timeouts
            proxy_connect_timeout 60s;
            proxy_send_timeout 60s;
            proxy_read_timeout 60s;
        }
    }
}