const BASE_URL = "/api";

export async function apiClient<T>(
  endpoint: string,
  options?: RequestInit,
): Promise<T> {
  // Get token from global window object (set by Keycloak client)
  const token =
    typeof window !== "undefined" ? (window as any).__KEYCLOAK_TOKEN__ : null;

  const headers: Record<string, string> = {
    "Content-Type": "application/json",
    ...((options?.headers as Record<string, string>) || {}),
  };

  // Add Authorization header if token exists
  if (token) {
    headers["Authorization"] = `Bearer ${token}`;
  }

  const res = await fetch(`${BASE_URL}${endpoint}`, {
    ...options,
    headers,
  });

  if (!res.ok) {
    // Handle 401 - token expired
    if (res.status === 401) {
      // Trigger token refresh by dispatching event
      if (typeof window !== "undefined") {
        window.dispatchEvent(new CustomEvent("token-expired"));
      }
    }
    throw new Error(`API error: ${res.status} ${res.statusText}`);
  }

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