import type { MaskDefinition } from "@/masks/types";
import {
	BOX_LIKE_MASK_PARAMS,
	buildBoxMaskInteraction,
	computeBoxMaskParamUpdate,
	getBoxLikeGeometry,
	getDefaultSquareMaskParams,
	getStrokeOffset,
	rotatePoint,
} from "../box-like";

function buildRectanglePath({
	centerX,
	centerY,
	halfWidth,
	halfHeight,
	rotationRad,
}: {
	centerX: number;
	centerY: number;
	halfWidth: number;
	halfHeight: number;
	rotationRad: number;
}): Path2D {
	const corners = [
		{ x: centerX - halfWidth, y: centerY - halfHeight },
		{ x: centerX + halfWidth, y: centerY - halfHeight },
		{ x: centerX + halfWidth, y: centerY + halfHeight },
		{ x: centerX - halfWidth, y: centerY + halfHeight },
	].map((point) =>
		rotatePoint({
			...point,
			centerX,
			centerY,
			rotationRad,
		}),
	);

	const path = new Path2D();
	path.moveTo(corners[0].x, corners[0].y);
	for (const corner of corners.slice(1)) {
		path.lineTo(corner.x, corner.y);
	}
	path.closePath();
	return path;
}

export const rectangleMaskDefinition: MaskDefinition<"rectangle"> = {
	type: "rectangle",
	name: "Rectangle",
	features: {
		hasPosition: true,
		hasRotation: true,
		sizeMode: "width-height",
	},
	params: BOX_LIKE_MASK_PARAMS,
	interaction: buildBoxMaskInteraction({
		sizeMode: "width-height",
	}),
	buildDefault(context) {
		return {
			type: "rectangle",
			params: getDefaultSquareMaskParams(context),
		};
	},
	computeParamUpdate: computeBoxMaskParamUpdate,
	renderer: {
		body: {
			kind: "fillPath",
			buildPath({ resolvedParams, width, height }) {
				const params = resolvedParams;
				const { centerX, centerY, maskWidth, maskHeight, rotationRad } =
					getBoxLikeGeometry({ params, width, height });
				return buildRectanglePath({
					centerX,
					centerY,
					halfWidth: maskWidth / 2,
					halfHeight: maskHeight / 2,
					rotationRad,
				});
			},
		},
		stroke: {
			kind: "strokeFromPath",
			buildStrokePath({ resolvedParams, width, height }) {
				const params = resolvedParams;
				const { centerX, centerY, maskWidth, maskHeight, rotationRad } =
					getBoxLikeGeometry({ params, width, height });
				const offset = getStrokeOffset({
					strokeAlign: params.strokeAlign,
					strokeWidth: params.strokeWidth,
				});
				return buildRectanglePath({
					centerX,
					centerY,
					halfWidth: Math.max(1, maskWidth / 2 + offset),
					halfHeight: Math.max(1, maskHeight / 2 + offset),
					rotationRad,
				});
			},
		},
	},
};