import { readable } from 'svelte/store';
import type { Page } from '$lib/api/types';

// Synthetic infinite-query object shape matching what the SPA reads from
// @tanstack/svelte-query. Enough surface area for component tests;
// real behavior is covered by the TanStack library's own tests.
//
// Returns a Svelte readable store (matching CreateInfiniteQueryResult) so
// the component can subscribe with the $store rune.
export function mockInfiniteQuery<T>(opts: {
  pages?: Page<T>[];
  isPending?: boolean;
  isError?: boolean;
  error?: unknown;
  hasNextPage?: boolean;
  isFetchingNextPage?: boolean;
  fetchNextPage?: () => void;
  refetch?: () => void;
} = {}) {
  return readable({
    data: { pages: opts.pages ?? [] },
    isPending: opts.isPending ?? false,
    isError: opts.isError ?? false,
    error: opts.error,
    hasNextPage: opts.hasNextPage ?? false,
    isFetchingNextPage: opts.isFetchingNextPage ?? false,
    fetchNextPage: opts.fetchNextPage ?? (() => {}),
    refetch: opts.refetch ?? (() => {})
  });
}

export function mockQuery<T>(opts: {
  data?: T;
  isPending?: boolean;
  isError?: boolean;
  error?: unknown;
  refetch?: () => void;
} = {}) {
  return readable({
    data: opts.data,
    isPending: opts.isPending ?? false,
    isError: opts.isError ?? false,
    error: opts.error,
    refetch: opts.refetch ?? (() => {})
  });
}