import type { Rectangle } from '../layout/geometry.js'
import type { DOMElement } from './dom.js'

/**
 * Cached layout bounds for each rendered node (used for blit + clearing).
 */
export type CachedLayout = {
	x: number
	y: number
	width: number
	height: number
	top?: number
}

export const nodeCache = new WeakMap<DOMElement, CachedLayout>()

/** Rects of removed children that need clearing on next render */
export const pendingClears = new WeakMap<DOMElement, Rectangle[]>()

let absoluteNodeRemoved = false

export function addPendingClear(parent: DOMElement, rect: Rectangle, isAbsolute: boolean): void {
	const existing = pendingClears.get(parent)
	if (existing) {
		existing.push(rect)
	} else {
		pendingClears.set(parent, [rect])
	}
	if (isAbsolute) {
		absoluteNodeRemoved = true
	}
}

export function consumeAbsoluteRemovedFlag(): boolean {
	const had = absoluteNodeRemoved
	absoluteNodeRemoved = false
	return had
}