import { API_BASE_URL } from "@/lib/api-base-url";

type RequestConfig = RequestInit & {
  params?: Record<string, string | number | boolean | null | undefined>;
};

export async function apiClient<T>(
  endpoint: string,
  config: RequestConfig = {}
): Promise<T> {
  const { params, headers, ...rest } = config;

  // Build URL with query parameters
  let url = `${API_BASE_URL}${endpoint}`;
  if (params) {
    const searchParams = new URLSearchParams();
    Object.entries(params).forEach(([key, value]) => {
      if (value !== undefined && value !== null) {
        searchParams.append(key, value.toString());
      }
    });
    url += `?${searchParams.toString()}`;
  }

  // Get token from localStorage (or handle as needed)
  const token = typeof window !== "undefined" ? localStorage.getItem("token") : null;
  const isFormData = typeof FormData !== "undefined" && rest.body instanceof FormData;

  const defaultHeaders: Record<string, string> = {
    Accept: "application/json",
  };

  if (!isFormData) {
    defaultHeaders["Content-Type"] = "application/json";
  }

  if (token) {
    defaultHeaders["Authorization"] = `Bearer ${token}`;
  }

  const response = await fetch(url, {
    ...rest,
    headers: {
      ...defaultHeaders,
      ...headers,
    },
  });

  if (!response.ok) {
    const errorData = await response.json().catch(() => ({}));
    throw new Error(errorData.message || `Request failed with status ${response.status}`);
  }

  return response.json();
}