/** 해치·그라데이션·경계·영역 — 선택한 객체가 이루는 닫힌 경계를 채우거나 뽑는다 */
import type { Point } from '@flatten-js/core';
import { toast } from 'react-toastify';
import {
	autoHatchSpacing,
	getHatchAngle,
	getHatchSpacing,
	getHatchStyle,
} from '../../commands/draw-settings';
import { entitiesToLoop } from '../../helpers/geometry/entity-loop';
import { addEntities, getActiveLineColor, setSelectedEntityIds } from '../../state';
import { Tool } from '../../tools';
import { hatchEntity, polyLineEntity } from '../factories/entity-factory';
import { createSequenceTool, type SequenceInput } from '../factories/sequence-tool';

/** 선택 객체에서 닫힌 경계를 얻는다. 못 얻으면 안내 후 빈 배열 */
function loopFromSelection(input: SequenceInput): Point[] {
	const loop = entitiesToLoop(input.entities(0));
	if (loop.length < 3) {
		toast.warn('닫힌 경계를 만들 객체를 선택하십시오.');
		return [];
	}
	return loop;
}

function boundingSize(points: Point[]): { width: number; height: number } {
	const xs = points.map((point) => point.x);
	const ys = points.map((point) => point.y);
	return { width: Math.max(...xs) - Math.min(...xs), height: Math.max(...ys) - Math.min(...ys) };
}

export const hatchToolStateMachine = createSequenceTool({
	tool: Tool.HATCH,
	helpers: false,
	steps: [
		{ kind: 'selection', instructions: '해치를 채울 경계 객체를 선택한 뒤 ENTER를 누르십시오.' },
	],
	commit: (input) => {
		const loop = loopFromSelection(input);
		if (!loop.length) return;
		const { width, height } = boundingSize(loop);
		addEntities(
			[
				hatchEntity(loop, {
					style: getHatchStyle(),
					color: getActiveLineColor(),
					spacing: getHatchSpacing() ?? autoHatchSpacing(width, height),
					angle: getHatchAngle(),
				}),
			],
			true
		);
		setSelectedEntityIds([]);
	},
});

export const gradientToolStateMachine = createSequenceTool({
	tool: Tool.GRADIENT,
	helpers: false,
	steps: [{ kind: 'selection', instructions: '그라데이션을 넣을 경계 객체를 선택한 뒤 ENTER.' }],
	commit: (input) => {
		const loop = loopFromSelection(input);
		if (!loop.length) return;
		addEntities(
			[
				hatchEntity(loop, {
					style: 'gradient',
					color: getActiveLineColor(),
					color2: '#000000',
				}),
			],
			true
		);
		setSelectedEntityIds([]);
	},
});

export const boundaryToolStateMachine = createSequenceTool({
	tool: Tool.BOUNDARY,
	helpers: false,
	steps: [{ kind: 'selection', instructions: '경계를 뽑을 객체를 선택한 뒤 ENTER를 누르십시오.' }],
	commit: (input) => {
		const loop = loopFromSelection(input);
		if (!loop.length) return;
		const boundary = polyLineEntity(loop);
		if (boundary) {
			addEntities([boundary], true);
			toast.success('닫힌 폴리선 경계를 만들었습니다.');
		}
		setSelectedEntityIds([]);
	},
});

export const regionToolStateMachine = createSequenceTool({
	tool: Tool.REGION,
	helpers: false,
	steps: [{ kind: 'selection', instructions: '영역으로 만들 객체를 선택한 뒤 ENTER.' }],
	commit: (input) => {
		const loop = loopFromSelection(input);
		if (!loop.length) return;
		const region = polyLineEntity(loop);
		if (region) {
			addEntities([region], true);
			// 2D 웹 CAD에는 별도 영역 객체가 없다 — 닫힌 폴리선이 같은 역할을 한다
			toast.info('영역은 닫힌 폴리선으로 작성했습니다.');
		}
		setSelectedEntityIds([]);
	},
});