import { tokenManager } from '../services/tokenManager';

/**
 * API Client with automatic token injection and refresh via TokenManager
 */

export interface ApiRequestOptions extends RequestInit {
  skipAuth?: boolean; // Skip adding Authorization header
  skipRefresh?: boolean; // Skip automatic token refresh on 401
}

/**
 * Make an authenticated API request with automatic token refresh
 * Uses TokenManager for robust token handling with request queuing
 */
export async function fetchWithAuth(
  endpoint: string,
  options: ApiRequestOptions = {}
): Promise<Response> {
  const { skipAuth = false, skipRefresh = false, ...fetchOptions } = options;

  // Get valid token from TokenManager (auto-refreshes if needed)
  const appToken = skipAuth ? null : await tokenManager.getValidToken();

  if (!appToken && !skipAuth) {
    throw new Error('Not authenticated');
  }

  // Prepare authenticated options
  const authenticatedOptions: RequestInit = {
    ...fetchOptions,
    headers: {
      'Content-Type': 'application/json',
      ...fetchOptions.headers,
      ...(appToken && !skipAuth ? { Authorization: `Bearer ${appToken}` } : {}),
    },
  };

  // Make the request
  const response = await fetch(endpoint, authenticatedOptions);

  // Handle token expiration with TokenManager (with request queuing)
  if (response.status === 401 && !skipRefresh && !skipAuth) {
    // Let TokenManager handle the 401 - it will queue this request if a refresh is in progress
    return tokenManager.handle401Response(endpoint, authenticatedOptions);
  }

  return response;
}

/**
 * Make an authenticated GET request
 */
export async function get<T = any>(
  endpoint: string,
  options?: ApiRequestOptions
): Promise<T> {
  const response = await fetchWithAuth(endpoint, {
    ...options,
    method: 'GET',
  });

  if (!response.ok) {
    const error = await response.json().catch(() => ({ message: 'Request failed' }));
    throw new Error(error.message || `GET request failed: ${response.status}`);
  }

  return response.json();
}

/**
 * Make an authenticated POST request
 */
export async function post<T = any>(
  endpoint: string,
  data?: any,
  options?: ApiRequestOptions
): Promise<T> {
  const response = await fetchWithAuth(endpoint, {
    ...options,
    method: 'POST',
    body: data ? JSON.stringify(data) : undefined,
  });

  if (!response.ok) {
    const error = await response.json().catch(() => ({ message: 'Request failed' }));
    throw new Error(error.message || `POST request failed: ${response.status}`);
  }

  return response.json();
}

/**
 * Make an authenticated PUT request
 */
export async function put<T = any>(
  endpoint: string,
  data?: any,
  options?: ApiRequestOptions
): Promise<T> {
  const response = await fetchWithAuth(endpoint, {
    ...options,
    method: 'PUT',
    body: data ? JSON.stringify(data) : undefined,
  });

  if (!response.ok) {
    const error = await response.json().catch(() => ({ message: 'Request failed' }));
    throw new Error(error.message || `PUT request failed: ${response.status}`);
  }

  return response.json();
}

/**
 * Make an authenticated DELETE request
 */
export async function del<T = any>(
  endpoint: string,
  options?: ApiRequestOptions
): Promise<T> {
  const response = await fetchWithAuth(endpoint, {
    ...options,
    method: 'DELETE',
  });

  if (!response.ok) {
    const error = await response.json().catch(() => ({ message: 'Request failed' }));
    throw new Error(error.message || `DELETE request failed: ${response.status}`);
  }

  return response.json();
}

/**
 * Make an authenticated PATCH request
 */
export async function patch<T = any>(
  endpoint: string,
  data?: any,
  options?: ApiRequestOptions
): Promise<T> {
  const response = await fetchWithAuth(endpoint, {
    ...options,
    method: 'PATCH',
    body: data ? JSON.stringify(data) : undefined,
  });

  if (!response.ok) {
    const error = await response.json().catch(() => ({ message: 'Request failed' }));
    throw new Error(error.message || `PATCH request failed: ${response.status}`);
  }

  return response.json();
}

// Export all methods as a default object
export default {
  fetchWithAuth,
  get,
  post,
  put,
  delete: del,
  patch,
};