directus

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import type { FieldFilter, Item, Query } from '@directus/types';
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import { generateJoi } from '@directus/utils';
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/*
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 Note: Filtering is normally done through SQL in run-ast. This function can be used in case an already
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 existing array of items has to be filtered using the same filter syntax as used in the ast-to-sql flow
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 */
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export function filterItems<T extends Item[]>(items: T, filter: Query['filter']): T {
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	if (!filter) return items;
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	return items.filter((item) => passesFilter(item, filter)) as T;
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	function passesFilter(item: Item, filter: Query['filter']): boolean {
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		if (!filter || Object.keys(filter).length === 0) return true;
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		if (Object.keys(filter)[0] === '_and') {
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			const subfilter = Object.values(filter)[0] as Query['filter'][];
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			return subfilter.every((subFilter) => {
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				return passesFilter(item, subFilter);
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			});
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		} else if (Object.keys(filter)[0] === '_or') {
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			const subfilter = Object.values(filter)[0] as Query['filter'][];
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			return subfilter.some((subFilter) => {
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				return passesFilter(item, subFilter);
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			});
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		} else {
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			const schema = generateJoi(filter as FieldFilter);
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			const { error } = schema.validate(item);
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			return error === undefined;
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		}
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	}
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}
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