const BASE_URL = import.meta.env.VITE_API_URL || 'http://localhost:9292';

/**
 * Make an HTTP request with automatic token header injection and error handling.
 */
export async function request(endpoint, options = {}) {
  const token = localStorage.getItem('authsec_token');
  
  const headers = {
    'Content-Type': 'application/json',
    ...(token ? { Authorization: `Bearer ${token}` } : {}),
    ...options.headers,
  };

  const url = endpoint.startsWith('http') ? endpoint : `${BASE_URL}${endpoint}`;

  try {
    const response = await fetch(url, {
      ...options,
      headers,
    });

    const contentType = response.headers.get('content-type');
    let data;

    if (contentType && contentType.includes('application/json')) {
      data = await response.json();
    } else {
      data = await response.text();
    }

    if (!response.ok) {
      const errorMessage =
        (typeof data === 'object' && (data.operationMessage || data.message || data.error)) ||
        (typeof data === 'string' && data) ||
        `HTTP Error: ${response.status}`;
      const err = new Error(errorMessage);
      err.status = response.status;
      err.data = data;
      throw err;
    }

    return data;
  } catch (error) {
    // If network fetch fails completely (e.g. backend server is not running)
    if (error.name === 'TypeError' && error.message.includes('fetch')) {
      const netErr = new Error('Cannot reach Spring Boot server at ' + BASE_URL + '. Is backend running?');
      netErr.isNetworkError = true;
      throw netErr;
    }
    throw error;
  }
}