events {
    worker_connections 1024;
}

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

    # Logging
    access_log /var/log/nginx/access.log;
    error_log /var/log/nginx/error.log;

    # Performance
    sendfile on;
    tcp_nopush on;
    tcp_nodelay on;
    keepalive_timeout 65;
    types_hash_max_size 2048;

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

    server {
        listen 80;
        server_name localhost;

        # Root directory for static files
        root /usr/share/nginx/html;
        index index.html;

        # Serve static frontend files
        location / {
            try_files $uri $uri/ /index.html;

            # Cache control for static assets
            location ~* \.(js|css|png|jpg|jpeg|gif|ico|svg|woff|woff2|ttf|eot)$ {
                expires 1y;
                add_header Cache-Control "public, immutable";
            }
        }

        # Proxy API requests to backend
        location /api/ {
            proxy_pass http://localhost:3000;
            proxy_http_version 1.1;

            # Headers
            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
            proxy_connect_timeout 60s;
            proxy_send_timeout 60s;
            proxy_read_timeout 60s;

            # Disable buffering for real-time responses
            proxy_buffering off;
        }

        # Health check endpoint (proxy to backend)
        location /health {
            proxy_pass http://localhost:3000/health;
            proxy_http_version 1.1;
            proxy_set_header Host $host;
            access_log off;
        }

        # Error pages
        error_page 404 /index.html;
        error_page 500 502 503 504 /50x.html;
        location = /50x.html {
            root /usr/share/nginx/html;
        }
    }
}