/**
 * 기준점 십자(좌표 0,0) 검증 — 확대해도 화면 크기 고정 · 원점에 붙음 · 도면 개체를 안 늘림.
 * 실행: cd B07_DesignDetail/openwebcad && npx vitest run --config vitest.tmp.config.ts origin-marker
 */
import { Point } from '@flatten-js/core';
import { describe, expect, it, vi } from 'vitest';
import { ScreenCanvasDrawController } from '../../../B07_DesignDetail/openwebcad/src/drawControllers/screenCanvas.drawController';
import { drawOriginMarker } from '../../../B07_DesignDetail/openwebcad/src/helpers/draw-functions';
import { getEntities } from '../../../B07_DesignDetail/openwebcad/src/state';

// 자동색(theme.ts)이 `document` 의 data-theme 를 읽는다.
vi.stubGlobal('document', { documentElement: { getAttribute: () => 'dark' } });

/** moveTo·lineTo·arc 인자만 기록하는 최소 2d 컨텍스트 — 나머지 호출은 무시. */
function recordingContext() {
	const segments: number[][] = [];
	const arcs: number[][] = [];
	let from: number[] = [];
	const context = new Proxy(
		{
			lineWidth: 1,
			moveTo: (x: number, y: number) => (from = [x, y]),
			lineTo: (x: number, y: number) => segments.push([...from, x, y]),
			arc: (x: number, y: number, r: number) => arcs.push([x, y, r]),
		} as Record<string, unknown>,
		{ get: (target, key: string) => target[key] ?? (() => undefined), set: () => true }
	) as unknown as CanvasRenderingContext2D;
	return { context, segments, arcs };
}

function drawAt(scale: number, offset: Point) {
	const { context, segments, arcs } = recordingContext();
	const controller = new ScreenCanvasDrawController(context);
	controller.setCanvasSize(new Point(800, 600));
	controller.setScreenScale(scale);
	controller.setScreenOffset(offset);
	drawOriginMarker(controller);
	const origin = controller.worldToTarget(new Point(0, 0));
	return { segments, arcs, origin };
}

describe('기준점 십자', () => {
	it.each([0.01, 1, 40])('확대 %s 배에서도 가로세로 20px', (scale) => {
		const { segments, arcs } = drawAt(scale, new Point(-120, 75));
		expect(segments).toHaveLength(2);
		const lengths = segments.map(([x1, y1, x2, y2]) => Math.hypot(x2 - x1, y2 - y1));
		expect(lengths).toEqual([20, 20]);
		// 끝점 둥글림(반지름 0.5)을 뺀 원 하나 — 작은 원
		expect(arcs.filter(([, , r]) => r > 1).map(([, , r]) => r)).toEqual([10 / 3]);
	});

	it('십자 중심이 원점에 붙어 이동을 따라감', () => {
		const a = drawAt(2, new Point(0, 0));
		const b = drawAt(2, new Point(50, -30));
		const center = ([x1, , x2]: number[]) => (x1 + x2) / 2;
		expect(center(a.segments[0])).toBeCloseTo(a.origin.x);
		expect(center(b.segments[0])).toBeCloseTo(b.origin.x);
		expect(b.origin.x - a.origin.x).toBeCloseTo(-100); // 세계 50 = 화면 100px(2배) — 화면을 옮기면 원점이 반대로 감
	});

	it('빈 도면 맞춤은 원점을 화면 가운데로 — 십자가 귀퉁이에 안 잘림', () => {
		const { context } = recordingContext();
		const controller = new ScreenCanvasDrawController(context);
		controller.setCanvasSize(new Point(800, 600));
		controller.setScreenScale(2);
		controller.setScreenOffset(new Point(0, 0));
		controller.zoomToFitScreen();
		const origin = controller.worldToTarget(new Point(0, 0));
		expect([origin.x, origin.y]).toEqual([400, 300]);
	});

	it('맞춘 뒤 캔버스가 커지면 다시 맞춤 · 사용자가 옮긴 뒤에는 그대로', () => {
		const { context } = recordingContext();
		const controller = new ScreenCanvasDrawController(context);
		controller.setCanvasSize(new Point(200, 100));
		controller.zoomToFitScreen();
		controller.setCanvasSize(new Point(800, 600));
		const refit = controller.worldToTarget(new Point(0, 0));
		expect([refit.x, refit.y]).toEqual([400, 300]);
		controller.panScreen(50, 0);
		controller.setCanvasSize(new Point(1000, 600));
		const kept = controller.worldToTarget(new Point(0, 0));
		expect([kept.x, kept.y]).toEqual([450, 300]);
	});

	it('그리기만 — 도면 개체를 만들지 않음', () => {
		drawAt(1, new Point(0, 0));
		expect(getEntities()).toHaveLength(0);
	});
});