// fetchClient.ts
type FetchOptions = {
  baseUrl?: string;
  headers?: Record<string, string>;
  timeout?: number;
};

export const createFetchClient = (config: FetchOptions) => {
  return async (url: string, options: RequestInit = {}) => {
    const controller = new AbortController();
    const id = config.timeout
      ? setTimeout(() => controller.abort(), config.timeout)
      : null;

    // Safely combine baseUrl with url path
    const fullUrl = config.baseUrl
      ? config.baseUrl.replace(/\/+$/, '') + '/' + url.replace(/^\/+/, '')
      : url;

    try {
      const response = await fetch(fullUrl, {
        ...options,
        headers: {
          ...config.headers,
          ...(options.headers || {}),
        },
        signal: controller.signal,
      });

      const contentType = response.headers.get('Content-Type') || '';

      if (!response.ok) {
        const errorText = await response.text();
        throw new Error(`HTTP ${response.status}: ${errorText}`);
      }

      if (contentType.includes('application/json')) {
        return await response.json();
      }

      return await response.text();
    } finally {
      if (id) clearTimeout(id);
    }
  };
};