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import { useCallback, useState } from 'react';
import {
convertPostPreviewToArticlePreview,
fetchPostsList,
} from '../../../services/graphql';
import type {
ArticlePreview,
GraphQLConnection,
GraphQLEdge,
Maybe,
WPPostPreview,
} from '../../../types';
import {
type UsePaginationConfig,
usePagination,
type UsePaginationReturn,
} from '../use-pagination';
export type useArticlesListReturn = Omit<
UsePaginationReturn<WPPostPreview>,
'data'
> & {
/**
* The articles list.
*/
articles: Maybe<GraphQLConnection<ArticlePreview>[]>;
/**
* The index of the first new result when loading more posts.
*/
firstNewResultIndex: Maybe<number>;
};
export const useArticlesList = (
config: Omit<UsePaginationConfig<WPPostPreview>, 'fetcher'>
): useArticlesListReturn => {
const {
data,
error,
hasNextPage,
isEmpty,
isError,
isLoading,
isLoadingMore,
isRefreshing,
isValidating,
loadMore,
size,
} = usePagination({ ...config, fetcher: fetchPostsList });
const [firstNewResultIndex, setFirstNewResultIndex] =
useState<Maybe<number>>(undefined);
const handleLoadMore = useCallback(async () => {
setFirstNewResultIndex(size * config.perPage + 1);
await loadMore();
}, [config.perPage, loadMore, size]);
const articles: Maybe<GraphQLConnection<ArticlePreview>[]> = data?.map(
({ edges, pageInfo }): GraphQLConnection<ArticlePreview> => {
return {
edges: edges.map((edge): GraphQLEdge<ArticlePreview> => {
return {
cursor: edge.cursor,
node: convertPostPreviewToArticlePreview(edge.node),
};
}),
pageInfo,
};
}
);
return {
articles,
error,
firstNewResultIndex,
hasNextPage,
isEmpty,
isError,
isLoading,
isLoadingMore,
isRefreshing,
isValidating,
loadMore: handleLoadMore,
size,
};
};
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