const TOKEN_KEY = 'ayos_token';

function getToken(): string | null {
  return localStorage.getItem(TOKEN_KEY);
}

async function request<T>(
  method: string,
  path: string,
  body?: unknown,
): Promise<T> {
  const headers: Record<string, string> = {
    'Content-Type': 'application/json',
  };

  const token = getToken();
  if (token) {
    headers['Authorization'] = `Bearer ${token}`;
  }

  const response = await fetch(path, {
    method,
    headers,
    body: body != null ? JSON.stringify(body) : undefined,
  });

  if (!response.ok) {
    let message = `Request failed: ${response.status}`;
    try {
      const errorData = await response.json();
      if (errorData.error) {
        message = errorData.error;
      } else if (errorData.message) {
        message = errorData.message;
      }
    } catch {
      // ignore JSON parse errors
    }
    throw new Error(message);
  }

  if (response.status === 204) {
    return undefined as T;
  }

  return response.json() as Promise<T>;
}

export const apiClient = {
  get<T>(path: string): Promise<T> {
    return request<T>('GET', path);
  },

  post<T>(path: string, body?: unknown): Promise<T> {
    return request<T>('POST', path, body);
  },

  put<T>(path: string, body?: unknown): Promise<T> {
    return request<T>('PUT', path, body);
  },

  delete<T>(path: string): Promise<T> {
    return request<T>('DELETE', path);
  },
};