import { compact } from 'es-toolkit';
import { HOVERED_SNAP_POINT_TIME } from '../App.consts';
import type { ScreenCanvasDrawController } from '../drawControllers/screenCanvas.drawController';
import {
	getAngleGuideEntities,
	getDebugEntities,
	getEntities,
	getGhostHelperEntities,
	getHighlightedEntityIds,
	getHoveredSnapPoints,
	getInputController,
	getSelectedEntities,
	getShouldDrawCursor,
	getSnapPoint,
	getSnapPointOnAngleGuide,
	isDrawingReadOnly,
	isOriginMarker,
	isViewOnly,
} from '../state';
import {
	drawCursor,
	drawDebugEntities,
	drawEntities,
	drawGrips,
	drawHelpers,
	drawOriginMarker,
	drawSnapPoint,
} from './draw-functions';
import { getClosestSnapPoint } from './get-closest-snap-point';
import { isPointEqual } from './is-point-equal';
import { drawScene } from './scene-cache';
import { drawGuide } from '../integration/guide-area';

/**
 * Hover highlight is excluded from the static scene cache (it changes every
 * mouse move) — re-draw the few highlighted entities on top of the blit.
 */
function drawHighlightedEntities(drawController: ScreenCanvasDrawController) {
	const highlightedIds = getHighlightedEntityIds();
	if (!highlightedIds.length) return;
	const idSet = new Set(highlightedIds);
	drawEntities(
		drawController,
		getEntities().filter((entity) => idSet.has(entity.id))
	);
}

export function draw(drawController: ScreenCanvasDrawController) {
	drawController.clear();

	// Static scene (all entities): cached bitmap blit, rebuilt only when needed.
	drawScene(drawController, performance.now());
	drawHighlightedEntities(drawController);

	if (isOriginMarker()) drawOriginMarker(drawController);
	drawGuide(drawController); // 작도 영역 점선(169-1) — 겹판이라 저장 · 인쇄 안 됨
	// 보기 전용 · 확정 도면은 그립 없음(H2 — 집지도 못함)
	if (!isViewOnly() && !isDrawingReadOnly()) drawGrips(drawController, getSelectedEntities());
	drawHelpers(drawController, getAngleGuideEntities());
	drawEntities(drawController, getGhostHelperEntities());
	drawDebugEntities(drawController, getDebugEntities());

	const { snapPoint: closestSnapPoint } = getClosestSnapPoint(
		compact([getSnapPoint(), getSnapPointOnAngleGuide()]),
		drawController.getWorldMouseLocation()
	);
	const isMarked =
		!!closestSnapPoint &&
		getHoveredSnapPoints().some(
			(hoveredSnapPoint) =>
				hoveredSnapPoint.milliSecondsHovered > HOVERED_SNAP_POINT_TIME &&
				isPointEqual(hoveredSnapPoint.snapPoint.point, closestSnapPoint.point)
		);
	drawSnapPoint(drawController, closestSnapPoint, isMarked);

	// 미리보기는 십자 커서 · 명령 안내 · 좌표 풍선을 그리지 않는다(손 모양 커서).
	if (getShouldDrawCursor() && !isViewOnly()) {
		drawCursor(drawController);
		getInputController().draw(drawController);
	}
}