import { FiltersData, Programme } from '../types/programme';

/**
 * Lấy API URL từ environment variable
 */
const getApiUrl = (): string | null => {
  const apiUrl = process.env.NEXT_PUBLIC_API_URL;
  if (!apiUrl) return null;
  return apiUrl;
};

/**
 * Fetch tất cả programmes từ API, trả về null nếu thất bại
 */
export const fetchProgrammes = async (): Promise<Programme[] | null> => {
  const apiUrl = getApiUrl();
  if (!apiUrl) return null;

  const url = `${apiUrl}/api/programmes`;

  try {
    const response = await fetch(url, {
      method: 'GET',
      headers: { 'Content-Type': 'application/json' },
      cache: 'no-store',
    });

    if (!response.ok) {
      throw new Error(`HTTP error! status: ${response.status}`);
    }

    const data: Programme[] = await response.json();
    return data;
  } catch {
    return null;
  }
};

/**
 * Fetch một programme theo id/slug, trả về null nếu thất bại
 */
export const fetchProgrammeById = async (id: string): Promise<Programme | null> => {
  const apiUrl = getApiUrl();
  if (!apiUrl) return null;

  const url = `${apiUrl}/api/programmes/${id}`;

  try {
    const response = await fetch(url, {
      method: 'GET',
      headers: { 'Content-Type': 'application/json' },
      cache: 'no-store',
    });

    if (!response.ok) {
      throw new Error(`HTTP error! status: ${response.status}`);
    }

    const data: Programme = await response.json();
    return data;
  } catch {
    return null;
  }
};

/**
 * Fetch những programmes được đánh dấu featured (selected: true)
 * trả về null nếu thất bại
 */
export const fetchFeaturedProgrammes = async (): Promise<Programme[] | null> => {
  const data = await fetchProgrammes();
  if (!data) return null;
  return data.filter((p) => p.selected === true);
};

/**
 * Fetch programme filter options from CMS.
 */
export const fetchProgrammeFilters = async (): Promise<FiltersData | null> => {
  const apiUrl = getApiUrl();
  if (!apiUrl) return null;

  const url = `${apiUrl}/api/programmes/filters`;

  try {
    const response = await fetch(url, {
      method: 'GET',
      headers: { 'Content-Type': 'application/json' },
      cache: 'no-store',
    });

    if (!response.ok) {
      throw new Error(`HTTP error! status: ${response.status}`);
    }

    const data: FiltersData = await response.json();
    return data;
  } catch {
    return null;
  }
};