/**
 * 객체 분리·숨기기 상태 (ISOLATEOBJECTS·HIDEOBJECTS·UNISOLATEOBJECTS).
 * 도면층 가시성과 달리 객체 단위이며 저장하지 않는 일시 상태다.
 */
import { HtmlEvent } from '../App.types';
import type { Entity } from '../entities/Entity';
import { notifyWindow } from '../state';
import { bumpSceneVersion } from './scene-version';

let hiddenEntityIds = new Set<string>();

export const isEntityHidden = (entity: Entity): boolean => hiddenEntityIds.has(entity.id);
export const getHiddenEntityCount = (): number => hiddenEntityIds.size;

function apply(ids: Set<string>): void {
	hiddenEntityIds = ids;
	bumpSceneVersion();
	notifyWindow(HtmlEvent.UPDATE_STATE);
}

/** 지정 객체를 숨긴다 */
export const hideEntities = (entities: Entity[]): void => {
	const next = new Set(hiddenEntityIds);
	for (const entity of entities) next.add(entity.id);
	apply(next);
};

/** 지정 객체만 남기고 나머지를 숨긴다 */
export const isolateEntities = (entities: Entity[], allEntities: Entity[]): void => {
	const keep = new Set(entities.map((entity) => entity.id));
	apply(new Set(allEntities.filter((entity) => !keep.has(entity.id)).map((entity) => entity.id)));
};

/** 숨김 해제 */
export const showAllEntities = (): void => apply(new Set());