import { describe, expect, it } from 'vitest';
import {
	PINCH_ZOOM_EXPONENT,
	WHEEL_LINE_PX,
	WHEEL_PAGE_PX,
	WHEEL_ZOOM_EXPONENT,
} from '../App.consts.ts';
import { wheelZoom } from './input-wheel.ts';

const wheel = (deltaY: number, deltaMode = 0, ctrlKey = false) =>
	wheelZoom({ deltaY, deltaMode, ctrlKey });

describe('CAD 휠 = 늘 줌(153-3)', () => {
	it('100 · 120 배수가 아닌 델타(확대율 90 % · 110 % · 트랙패드 잔 델타)도 줌', () => {
		for (const deltaY of [100, 120, 111.1, 90.9, 4, -100, -111.1, -4]) {
			expect(wheel(deltaY)).toEqual({ delta: -deltaY, exponent: WHEEL_ZOOM_EXPONENT });
		}
	});

	it('줄 · 쪽 단위는 픽셀로 환산', () => {
		expect(wheel(3, 1)).toEqual({ delta: -3 * WHEEL_LINE_PX, exponent: WHEEL_ZOOM_EXPONENT });
		expect(wheel(-1, 2)).toEqual({ delta: WHEEL_PAGE_PX, exponent: WHEEL_ZOOM_EXPONENT });
	});

	it('ctrl+휠(핀치)은 핀치 지수', () => {
		expect(wheel(-7, 0, true)).toEqual({ delta: 7, exponent: PINCH_ZOOM_EXPONENT });
	});

	it('델타 0 은 안 움직임', () => {
		expect(wheel(0)).toBeNull();
		expect(wheel(0, 0, true)).toBeNull();
	});
});