import type { LocaleCode } from '../i18n/messages';

export interface GalleryBranding {
  primary_color: string;
  secondary_color: string;
  background_color: string;
}

export interface GalleryMetaResponse {
  event: {
    id: number;
    name: string;
    slug?: string | null;
    description?: string | null;
    gallery_expires_at?: string | null;
  };
  branding: GalleryBranding;
}

export interface GalleryPhotoResource {
  id: number;
  thumbnail_url: string | null;
  full_url: string | null;
  download_url: string;
  likes_count: number;
  guest_name?: string | null;
  created_at?: string | null;
}

export interface GalleryPhotosResponse {
  data: GalleryPhotoResource[];
  next_cursor: string | null;
}

async function handleResponse<T>(response: Response): Promise<T> {
  if (response.status === 204) {
    return {} as T;
  }

  const data = await response.json().catch(() => null);

  if (!response.ok) {
    const error = new Error((data && data.error && data.error.message) || 'Request failed');
    (error as any).code = data?.error?.code ?? response.status;
    throw error;
  }

  return data as T;
}

export async function fetchGalleryMeta(token: string, locale?: LocaleCode): Promise<GalleryMetaResponse> {
  const params = new URLSearchParams();
  if (locale) params.set('locale', locale);

  const response = await fetch(`/api/v1/gallery/${encodeURIComponent(token)}${params.toString() ? `?${params.toString()}` : ''}`, {
    headers: {
      'Accept': 'application/json',
    },
    credentials: 'omit',
  });

  return handleResponse<GalleryMetaResponse>(response);
}

export async function fetchGalleryPhotos(token: string, cursor?: string | null, limit = 30): Promise<GalleryPhotosResponse> {
  const params = new URLSearchParams();
  params.set('limit', String(limit));
  if (cursor) {
    params.set('cursor', cursor);
  }

  const response = await fetch(`/api/v1/gallery/${encodeURIComponent(token)}/photos?${params.toString()}`, {
    headers: {
      'Accept': 'application/json',
    },
    credentials: 'omit',
  });

  return handleResponse<GalleryPhotosResponse>(response);
}