import { Point } from '@flatten-js/core';
import { beforeEach, describe, expect, it } from 'vitest';
import { createActor } from 'xstate';
import { LineEntity } from '../entities/LineEntity.ts';
import {
	getEntities,
	resetUndoBaseline,
	setEntities,
	setSelectedEntityIds,
	undo,
} from '../state.ts';
import { ScaleState, scaleToolStateMachine } from './scale-tool.ts';
import { ActorEvent } from './tool.types.ts';

const ends = (index: number) => {
	const line = getEntities()[index] as LineEntity;
	const a = line.getStartPoint();
	const b = line.getEndPoint();
	return [a.x, a.y, b.x, b.y];
};

/** 기준점 (2,0) 클릭까지 — 선 A(0,0)-(10,0) 고름 · 선 B(0,5)-(4,5) 는 그대로 둘 것 */
function startAtBasePoint() {
	const a = new LineEntity('layer1', new Point(0, 0), new Point(10, 0));
	const b = new LineEntity('layer1', new Point(0, 5), new Point(4, 5));
	setEntities([a, b]);
	resetUndoBaseline();
	setSelectedEntityIds([a.id]);
	const actor = createActor(scaleToolStateMachine).start();
	expect(actor.getSnapshot().value).toBe(ScaleState.WAITING_FOR_BASE_VECTOR_START_POINT);
	actor.send({
		type: ActorEvent.MOUSE_CLICK,
		worldMouseLocation: new Point(2, 0),
		screenMouseLocation: new Point(0, 0),
		holdingCtrl: false,
		holdingShift: false,
	});
	expect(actor.getSnapshot().value).toBe(ScaleState.WAITING_FOR_BASE_VECTOR_END_POINT);
	return { actor, a, b };
}

const typeNumber = (actor: ReturnType<typeof startAtBasePoint>['actor'], value: number) =>
	actor.send({ type: ActorEvent.NUMBER_INPUT, value, worldMouseLocation: new Point(99, 99) });

describe('축척 — 기준점 + 숫자 배율 (226-1)', () => {
	beforeEach(() => setSelectedEntityIds([]));

	it('배율 2 = 기준점 고정 두 배 · 다른 객체 · 순서 그대로', () => {
		const { actor, a, b } = startAtBasePoint();
		typeNumber(actor, 2);
		// (0,0)→(-2,0) · (10,0)→(18,0) — 기준점 (2,0) 은 그대로
		expect(ends(0)).toEqual([-2, 0, 18, 0]);
		expect(getEntities()[0].id).toBe(a.id);
		expect(getEntities()[1]).toBe(b);
		expect(ends(1)).toEqual([0, 5, 4, 5]);
		// 끝나면 선택 풀고 다음 고르기로
		expect(actor.getSnapshot().value).toBe(ScaleState.WAITING_FOR_SELECTION);
	});

	it('배율 0.5 = 절반', () => {
		const { actor } = startAtBasePoint();
		typeNumber(actor, 0.5);
		expect(ends(0)).toEqual([1, 0, 6, 0]);
	});

	it('되돌리기 한 번에 원래 자리', () => {
		const { actor } = startAtBasePoint();
		typeNumber(actor, 2);
		undo();
		expect(ends(0)).toEqual([0, 0, 10, 0]);
		expect(getEntities()).toHaveLength(2);
	});

	it('Esc = 취소 — 객체 그대로', () => {
		const { actor, a, b } = startAtBasePoint();
		actor.send({ type: ActorEvent.ESC });
		expect(getEntities()).toEqual([a, b]);
		expect(ends(0)).toEqual([0, 0, 10, 0]);
		typeNumber(actor, 2);
		expect(ends(0)).toEqual([0, 0, 10, 0]);
	});

	it('배율 0 은 받지 않음', () => {
		const { actor } = startAtBasePoint();
		typeNumber(actor, 0);
		expect(ends(0)).toEqual([0, 0, 10, 0]);
		expect(actor.getSnapshot().value).toBe(ScaleState.WAITING_FOR_BASE_VECTOR_END_POINT);
	});
});