Genarrative/apps/ai-game-creator-shell/tests/useNodeTransformInteraction.test.tsx

// @vitest-environment jsdom

import { act, renderHook } from '@testing-library/react';
import { describe, expect, it, vi } from 'vitest';

import type { Node as UiNode } from '../src/features/ui-editor/types/Node';
import type { UITree } from '../src/features/ui-editor/types/UITree';
import { useNodeTransformInteraction } from '../src/view/ui-editor/components/preview/useNodeTransformInteraction';
import type { UiEditorCanvasProjection } from '../src/view/ui-editor/useUiEditorPage';

function node(id: string, children: UiNode[] = []): UiNode {
  return {
    id,
    layout: {
      transform: {
        anchor_min: [0, 0],
        anchor_max: [1, 1],
        offset_min: [0, 0],
        offset_max: [0, 0],
      },
      custom_minimum_size: [0, 0],
      size_flags_horizontal: 1,
      size_flags_vertical: 1,
      size_flags_stretch_ratio: 1,
      container: 'None',
    },
    metadata: {
      name: id,
      description: '',
      layout_status: 'NoProblem',
      components_status: 'NoProblem',
      allow_llm_edit_layout: true,
      allow_llm_edit_component: true,
      source: 'System',
    },
    components: [],
    children,
  };
}

const child = node('child');
const pageTree: UITree = {
  src_ui_design: 'page',
  root: node('root', [child]),
};

function gestureTarget() {
  const target = document.createElement('div');
  Object.assign(target, {
    setPointerCapture: vi.fn(),
    hasPointerCapture: vi.fn(() => true),
    releasePointerCapture: vi.fn(),
  });
  return target;
}

function pointerEvent(
  target: HTMLDivElement,
  pointerId: number,
  clientX: number,
  clientY: number,
) {
  return {
    button: 0,
    clientX,
    clientY,
    currentTarget: target,
    pointerId,
    preventDefault: vi.fn(),
    shiftKey: false,
    stopPropagation: vi.fn(),
  } as never;
}

function canvas() {
  return {
    selectNode: vi.fn(),
    updateNodeTransform: vi.fn(),
  } as Pick<UiEditorCanvasProjection, 'selectNode' | 'updateNodeTransform'>;
}

function renderInteraction({
  activeImageId = 'page',
  scale = 1,
  tree = pageTree,
}: {
  activeImageId?: string | null;
  scale?: number;
  tree?: UITree | null;
} = {}) {
  const canvasProjection = canvas();
  const viewportRef = { current: { scale } };
  const hook = renderHook(
    ({ imageId, currentTree }) =>
      useNodeTransformInteraction({
        activeImageId: imageId,
        canvas: canvasProjection,
        logicalSize: { width: 320, height: 180 },
        spaceHeld: false,
        tree: currentTree,
        viewportRef,
      }),
    { initialProps: { imageId: activeImageId, currentTree: tree } },
  );
  return { ...hook, canvasProjection, viewportRef };
}

describe('useNodeTransformInteraction', () => {
  it('makes drag and resize mutually exclusive, then permits the next gesture', () => {
    const { result, canvasProjection } = renderInteraction();
    const dragTarget = gestureTarget();
    const resizeTarget = gestureTarget();

    act(() => {
      result.current.onNodePointerDown(
        pointerEvent(dragTarget, 1, 0, 0),
        child,
      );
      result.current.onNodeResizePointerDown(
        pointerEvent(resizeTarget, 2, 0, 0),
        child,
        'se',
      );
      result.current.onNodePointerMove(pointerEvent(dragTarget, 1, 12, 8));
    });

    expect(resizeTarget.setPointerCapture).not.toHaveBeenCalled();
    expect(canvasProjection.updateNodeTransform).toHaveBeenCalledTimes(1);

    act(() => {
      result.current.onNodePointerUp(pointerEvent(dragTarget, 1, 12, 8));
      result.current.onNodeResizePointerDown(
        pointerEvent(resizeTarget, 2, 0, 0),
        child,
        'se',
      );
    });
    expect(resizeTarget.setPointerCapture).toHaveBeenCalledWith(2);
  });

  it('cancels a gesture when its tree changes and ignores its later events', () => {
    const { result, rerender, canvasProjection } = renderInteraction();
    const target = gestureTarget();

    act(() => {
      result.current.onNodePointerDown(pointerEvent(target, 1, 0, 0), child);
    });
    act(() => {
      rerender({
        imageId: 'other',
        currentTree: { ...pageTree, src_ui_design: 'other' },
      });
    });
    act(() => {
      result.current.onNodePointerMove(pointerEvent(target, 1, 12, 8));
    });

    expect(target.releasePointerCapture).toHaveBeenCalledWith(1);
    expect(canvasProjection.updateNodeTransform).not.toHaveBeenCalled();
  });

  it('cancels instead of persisting a non-finite transform', () => {
    const { result, canvasProjection, viewportRef } = renderInteraction();
    const target = gestureTarget();

    act(() => {
      result.current.onNodePointerDown(pointerEvent(target, 1, 0, 0), child);
      viewportRef.current.scale = Number.NaN;
      result.current.onNodePointerMove(pointerEvent(target, 1, 12, 8));
    });

    expect(target.releasePointerCapture).toHaveBeenCalledWith(1);
    expect(canvasProjection.updateNodeTransform).not.toHaveBeenCalled();
  });

  it('releases a captured pointer when the preview unmounts', () => {
    const { result, unmount } = renderInteraction();
    const target = gestureTarget();

    act(() => {
      result.current.onNodePointerDown(pointerEvent(target, 1, 0, 0), child);
      unmount();
    });

    expect(target.releasePointerCapture).toHaveBeenCalledWith(1);
  });
});