upstream talk2me {
    server talk2me:5005 fail_timeout=0;
}

server {
    listen 80;
    server_name _;
    
    # Redirect to HTTPS in production
    # return 301 https://$server_name$request_uri;
    
    # Security headers
    add_header X-Content-Type-Options nosniff always;
    add_header X-Frame-Options DENY always;
    add_header X-XSS-Protection "1; mode=block" always;
    add_header Referrer-Policy "strict-origin-when-cross-origin" always;
    add_header Content-Security-Policy "default-src 'self'; script-src 'self' 'unsafe-inline'; style-src 'self' 'unsafe-inline'; img-src 'self' data:; font-src 'self'; connect-src 'self'; media-src 'self';" always;

    # File upload limits
    client_max_body_size 50M;
    client_body_buffer_size 1M;
    client_body_timeout 120s;

    # Timeouts
    proxy_connect_timeout 120s;
    proxy_send_timeout 120s;
    proxy_read_timeout 120s;
    send_timeout 120s;

    # Gzip compression
    gzip on;
    gzip_vary on;
    gzip_min_length 1024;
    gzip_types text/plain text/css text/xml text/javascript application/x-javascript application/xml+rss application/json application/javascript;

    # Static files
    location /static {
        alias /app/static;
        expires 1y;
        add_header Cache-Control "public, immutable";
        
        # Gzip static files
        gzip_static on;
    }

    # Service worker
    location /service-worker.js {
        proxy_pass http://talk2me;
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        add_header Cache-Control "no-cache, no-store, must-revalidate";
    }

    # WebSocket support for future features
    location /ws {
        proxy_pass http://talk2me;
        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;
        
        # WebSocket timeouts
        proxy_read_timeout 86400s;
        proxy_send_timeout 86400s;
    }

    # Health check (don't log)
    location /health {
        proxy_pass http://talk2me/health;
        access_log off;
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
    }

    # Main application
    location / {
        proxy_pass http://talk2me;
        proxy_redirect off;
        proxy_buffering off;
        
        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_set_header X-Forwarded-Host $server_name;
        
        # Don't buffer responses
        proxy_buffering off;
        proxy_request_buffering off;
    }
}

# HTTPS configuration (uncomment for production)
# server {
#     listen 443 ssl http2;
#     server_name your-domain.com;
#     
#     ssl_certificate /etc/nginx/ssl/cert.pem;
#     ssl_certificate_key /etc/nginx/ssl/key.pem;
#     ssl_protocols TLSv1.2 TLSv1.3;
#     ssl_ciphers ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384;
#     ssl_prefer_server_ciphers off;
#     
#     # Include all location blocks from above
# }