server {
    listen 8334;
    server_name localhost;

    # Map to dynamically set CORS origin based on request
    # This allows multiple localhost ports for development
    set $cors_origin "";
    if ($http_origin ~* "^http://localhost:(5173|5174|5175|3000|8080)$") {
        set $cors_origin $http_origin;
    }

    # Proxy to SeaweedFS S3 endpoint
    location / {
        # Hide CORS headers from upstream SeaweedFS (to prevent duplicates)
        proxy_hide_header 'Access-Control-Allow-Origin';
        proxy_hide_header 'Access-Control-Allow-Methods';
        proxy_hide_header 'Access-Control-Allow-Headers';
        proxy_hide_header 'Access-Control-Expose-Headers';
        proxy_hide_header 'Access-Control-Max-Age';
        proxy_hide_header 'Access-Control-Allow-Credentials';

        # CORS Headers for development - dynamically set based on request origin
        add_header 'Access-Control-Allow-Origin' $cors_origin always;
        add_header 'Access-Control-Allow-Methods' 'GET, PUT, POST, DELETE, HEAD, OPTIONS' always;
        add_header 'Access-Control-Allow-Headers' '*' always;
        add_header 'Access-Control-Expose-Headers' 'ETag, Content-Length, Content-Type' always;
        add_header 'Access-Control-Max-Age' '3600' always;

        # Handle preflight requests
        if ($request_method = 'OPTIONS') {
            add_header 'Access-Control-Allow-Origin' $cors_origin always;
            add_header 'Access-Control-Allow-Methods' 'GET, PUT, POST, DELETE, HEAD, OPTIONS' always;
            add_header 'Access-Control-Allow-Headers' '*' always;
            add_header 'Access-Control-Max-Age' '3600' always;
            add_header 'Content-Type' 'text/plain; charset=utf-8' always;
            add_header 'Content-Length' '0' always;
            return 204;
        }

        # Proxy to SeaweedFS
        proxy_pass http://seaweedfs:8333;
        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;

        # Important for large file uploads
        proxy_request_buffering off;
        client_max_body_size 1G;
    }
}