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import type { EdgesResponse, GraphQLEdges, Maybe } from '../../../src/types';
import { settings } from '../../../src/utils/config';
/**
* Retrieve the edges.
*
* @param {T[]} data - An array of objects.
* @param {number} offset - The offset.
* @returns {Array<Edge<T>>} The edges.
*/
export const getEdges = <T>(data: T[], offset: number): GraphQLEdges<T>[] =>
data.map((singleData, index) => {
const currentItemNumber = index + 1;
return {
cursor: `cursor${currentItemNumber + offset}`,
node: singleData,
};
});
type GetConnectionProps<T> = {
data: Maybe<T[]>;
first: Maybe<number>;
after: Maybe<string>;
};
/**
* Retrieve a GraphQL connection.
*
* @param props - An object.
* @param props.after - The number of items before.
* @param props.data - An array of items.
* @param props.first - The number of items per page.
* @returns {Connection<T>} The connection.
*/
export const getConnection = <T>({
after,
data = [],
first = settings.postsPerPage,
}: GetConnectionProps<T>): EdgesResponse<T> => {
const afterInt = after ? Number(after.replace('cursor', '')) : 0;
const edges = getEdges(data.slice(afterInt, afterInt + first), afterInt);
const endCursor =
edges.length > 0 ? edges[edges.length - 1].cursor : 'cursor1';
return {
edges,
pageInfo: {
endCursor,
hasNextPage: data.length - afterInt > first,
total: data.length,
},
};
};
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