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import { SHOW_ALL_SLUG } from '@automattic/design-picker';
import { useTranslate } from 'i18n-calypso';
import { useEffect, useMemo, useState } from 'react';
import { gatherCategories } from './utils';
import type { Category, Design } from '@automattic/design-picker';
export interface Categorization {
selection: string | null;
onSelect: ( selectedSlug: string | null ) => void;
categories: Category[];
}
interface UseCategorizationOptions {
defaultSelection: string | null;
showAllFilter?: boolean;
sort?: ( a: Category, b: Category ) => number;
}
export function useCategorization(
designs: Design[],
{ defaultSelection, showAllFilter, sort }: UseCategorizationOptions
): Categorization {
const translate = useTranslate();
const categories = useMemo( () => {
const result = gatherCategories( designs );
if ( sort ) {
result.sort( sort );
}
if ( showAllFilter && designs.length ) {
result.unshift( {
name: translate( 'Show All' ),
slug: SHOW_ALL_SLUG,
} );
}
return result;
}, [ designs, showAllFilter, sort, translate ] );
const [ selection, onSelect ] = useState< string | null >(
chooseDefaultSelection( categories, defaultSelection )
);
useEffect( () => {
if ( shouldSetToDefaultSelection( categories, selection ) ) {
onSelect( chooseDefaultSelection( categories, defaultSelection ) );
}
}, [ categories, defaultSelection, selection ] );
return {
categories,
selection,
onSelect,
};
}
/**
* Check that the current selection still matches one of the category slugs,
* and if it doesn't reset the current selection to the default selection.
* @param categories the list of available categories
* @param currentSelection the slug of the current selected category
* @returns whether the current selection should be set to the default selection
*/
function shouldSetToDefaultSelection(
categories: Category[],
currentSelection: string | null
): boolean {
// For an empty list, `null` selection is the only correct one.
if ( categories.length === 0 && currentSelection === null ) {
return false;
}
return ! categories.some( ( { slug } ) => slug === currentSelection );
}
/**
* Chooses which category is the one that should be used by default.
* If `defaultSelection` is a valid category slug then it'll be used, otherwise it'll be whichever
* category appears first in the list.
* @param categories the categories from which the default will be selected
* @param defaultSelection use this category as the default selection if possible
* @returns the default category or null if none is available
*/
function chooseDefaultSelection(
categories: Category[],
defaultSelection: string | null
): string | null {
if ( defaultSelection && categories.find( ( { slug } ) => slug === defaultSelection ) ) {
return defaultSelection;
}
return categories[ 0 ]?.slug ?? null;
}
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