server {
    listen 3800;  # Changed to port 3800 to match external Nginx config
    server_name localhost;
    
    # Root directory for static files
    root /usr/share/nginx/html;
    
    index index.html;
    
    # Enable gzip compression
    gzip on;
    gzip_min_length 1000;
    gzip_proxied expired no-cache no-store private auth;
    gzip_types text/plain text/css application/json application/javascript application/x-javascript text/xml application/xml application/xml+rss text/javascript;
    
    # Add CORS headers for static assets including images
    location ~* \.(js|css|png|jpg|jpeg|gif|ico|svg)$ {
        expires 30d;
        add_header Cache-Control "public, no-transform";
        add_header Access-Control-Allow-Origin * always;
        add_header Access-Control-Allow-Methods 'GET, OPTIONS' always;
        add_header Access-Control-Allow-Headers 'Origin, X-Requested-With, Content-Type, Accept, Authorization' always;
        try_files $uri =404;
    }
    
    # Forward all requests to index.html for SPA routing
    location / {
        try_files $uri $uri/ /index.html;
        
        # Add CORS headers for all responses
        add_header Access-Control-Allow-Origin * always;
        add_header Access-Control-Allow-Methods 'GET, POST, OPTIONS' always;
        add_header Access-Control-Allow-Headers 'Origin, X-Requested-With, Content-Type, Accept, Authorization' always;
    }
    
    # Respond to preflighted CORS requests
    location /api/ {
        if ($request_method = 'OPTIONS') {
            add_header Access-Control-Allow-Origin * always;
            add_header Access-Control-Allow-Methods 'GET, POST, OPTIONS' always; 
            add_header Access-Control-Allow-Headers 'DNT,X-CustomHeader,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Authorization' always;
            add_header Access-Control-Max-Age 1728000;
            add_header Content-Type 'text/plain charset=UTF-8';
            add_header Content-Length 0;
            return 204;
        }
        try_files $uri $uri/ /index.html;
    }
    
    # Don't cache HTML
    location ~* \.html$ {
        expires -1;
        add_header Cache-Control "no-store, no-cache, must-revalidate, proxy-revalidate";
    }
    
    # Error handling
    error_page 404 /index.html;
    error_page 500 502 503 504 /index.html;
}