import { describe, expect, test } from 'vitest';

import { resourceCanvasGestureExceededDragThreshold } from '../src/features/resource-canvas/resourceCanvasCardGestureModel';
import { RESOURCE_CANVAS_DRAG_THRESHOLD } from '../src/view/project-development/resourceCanvasLayoutModel';

describe('画布卡片手势：拖动 / 点击的唯一判据', () => {
  const gesture = (deltaX: number, deltaY: number) =>
    resourceCanvasGestureExceededDragThreshold({
      startClientX: 100,
      startClientY: 100,
      clientX: 100 + deltaX,
      clientY: 100 + deltaY,
    });

  test('正好到阈值算拖动，差一点点仍算点击（与资源卡同一个阈值）', () => {
    expect(RESOURCE_CANVAS_DRAG_THRESHOLD).toBe(5);
    expect(gesture(RESOURCE_CANVAS_DRAG_THRESHOLD, 0)).toBe(true);
    expect(gesture(RESOURCE_CANVAS_DRAG_THRESHOLD - 0.1, 0)).toBe(false);
    expect(gesture(0, 0)).toBe(false);
  });

  test('位移按欧氏距离算：斜向 3/4 就是 5', () => {
    expect(gesture(3, 4)).toBe(true);
    expect(gesture(2, 3)).toBe(false);
  });

  test('阈值可覆盖（各档手势需要更紧或更松时只改参数，不改判据）', () => {
    expect(
      resourceCanvasGestureExceededDragThreshold({
        startClientX: 0,
        startClientY: 0,
        clientX: 1,
        clientY: 0,
        threshold: 1,
      }),
    ).toBe(true);
  });

  test('几何非法时按「没有拖动」算：宁可把拖动当点击，也不能把点击误判成拖动', () => {
    expect(
      resourceCanvasGestureExceededDragThreshold({
        startClientX: Number.NaN,
        startClientY: 100,
        clientX: 200,
        clientY: 100,
      }),
    ).toBe(false);
  });
});