/**
 * Tests for canvas image selection functionality
 * Tests click selection, multi-select, and background deselection
 */

import { describe, it, expect, beforeEach, vi, afterEach } from 'vitest';
import Konva from 'konva';
import { get } from 'svelte/store';
import { selection } from '$lib/stores/selection';
import {
  setupImageSelection,
  setupBackgroundDeselect,
  selectImage,
  deselectImage,
  toggleImageSelection,
  selectAllImages,
  clearAllSelection,
  getSelectedCount,
  getSelectedImageIds,
  isImageSelected,
} from '$lib/canvas/interactions/select';

describe('Image Selection', () => {
  let stage: Konva.Stage;
  let layer: Konva.Layer;
  let image: Konva.Image;
  let imageId: string;

  beforeEach(() => {
    // Create container
    const container = document.createElement('div');
    container.id = 'test-container';
    document.body.appendChild(container);

    // Create stage and layer
    stage = new Konva.Stage({
      container: 'test-container',
      width: 800,
      height: 600,
    });

    layer = new Konva.Layer();
    stage.add(layer);

    // Create test image
    const imageElement = new Image();
    imageElement.src =
      'data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVR42mNk+M9QDwADhgGAWjR9awAAAABJRU5ErkJggg==';

    image = new Konva.Image({
      image: imageElement,
      x: 100,
      y: 100,
      width: 200,
      height: 200,
    });

    layer.add(image);
    layer.draw();

    imageId = 'test-image-1';

    // Reset selection
    selection.clearSelection();
  });

  afterEach(() => {
    stage.destroy();
    document.body.innerHTML = '';
  });

  describe('Setup', () => {
    it('sets up click handler on image', () => {
      const cleanup = setupImageSelection(image, imageId);

      expect(typeof cleanup).toBe('function');

      cleanup();
    });

    it('cleanup function removes click handlers', () => {
      const cleanup = setupImageSelection(image, imageId);

      // Select the image
      image.fire('click', { evt: { ctrlKey: false, metaKey: false } });
      expect(get(selection).selectedIds.has(imageId)).toBe(true);

      // Clean up
      cleanup();

      // Clear selection
      selection.clearSelection();

      // Click should no longer work
      image.fire('click', { evt: { ctrlKey: false, metaKey: false } });
      expect(get(selection).selectedIds.has(imageId)).toBe(false);
    });
  });

  describe('Single Click Selection', () => {
    it('selects image on click', () => {
      setupImageSelection(image, imageId);

      image.fire('click', { evt: { ctrlKey: false, metaKey: false } });

      const selectionState = get(selection);
      expect(selectionState.selectedIds.has(imageId)).toBe(true);
      expect(selectionState.selectedIds.size).toBe(1);
    });

    it('replaces selection when clicking different image', () => {
      selection.selectOne('other-image');

      setupImageSelection(image, imageId);

      image.fire('click', { evt: { ctrlKey: false, metaKey: false } });

      const selectionState = get(selection);
      expect(selectionState.selectedIds.has(imageId)).toBe(true);
      expect(selectionState.selectedIds.has('other-image')).toBe(false);
      expect(selectionState.selectedIds.size).toBe(1);
    });

    it('calls onSelectionChange callback', () => {
      const callback = vi.fn();

      setupImageSelection(image, imageId, undefined, callback);

      image.fire('click', { evt: { ctrlKey: false, metaKey: false } });

      expect(callback).toHaveBeenCalledWith(imageId, true);
    });

    it('does not deselect on second click without Ctrl', () => {
      setupImageSelection(image, imageId);

      image.fire('click', { evt: { ctrlKey: false, metaKey: false } });
      image.fire('click', { evt: { ctrlKey: false, metaKey: false } });

      const selectionState = get(selection);
      expect(selectionState.selectedIds.has(imageId)).toBe(true);
    });
  });

  describe('Multi-Select (Ctrl+Click)', () => {
    it('adds to selection with Ctrl+Click', () => {
      selection.selectOne('other-image');

      setupImageSelection(image, imageId);

      image.fire('click', { evt: { ctrlKey: true, metaKey: false } });

      const selectionState = get(selection);
      expect(selectionState.selectedIds.has(imageId)).toBe(true);
      expect(selectionState.selectedIds.has('other-image')).toBe(true);
      expect(selectionState.selectedIds.size).toBe(2);
    });

    it('removes from selection with Ctrl+Click on selected image', () => {
      selection.selectMultiple([imageId, 'other-image']);

      setupImageSelection(image, imageId);

      image.fire('click', { evt: { ctrlKey: true, metaKey: false } });

      const selectionState = get(selection);
      expect(selectionState.selectedIds.has(imageId)).toBe(false);
      expect(selectionState.selectedIds.has('other-image')).toBe(true);
      expect(selectionState.selectedIds.size).toBe(1);
    });

    it('works with Cmd key (metaKey) on Mac', () => {
      selection.selectOne('other-image');

      setupImageSelection(image, imageId);

      image.fire('click', { evt: { ctrlKey: false, metaKey: true } });

      const selectionState = get(selection);
      expect(selectionState.selectedIds.has(imageId)).toBe(true);
      expect(selectionState.selectedIds.size).toBe(2);
    });

    it('calls callback with correct state when adding to selection', () => {
      const callback = vi.fn();

      setupImageSelection(image, imageId, undefined, callback);

      image.fire('click', { evt: { ctrlKey: true, metaKey: false } });

      expect(callback).toHaveBeenCalledWith(imageId, true);
    });

    it('calls callback with correct state when removing from selection', () => {
      const callback = vi.fn();

      selection.selectOne(imageId);

      setupImageSelection(image, imageId, undefined, callback);

      image.fire('click', { evt: { ctrlKey: true, metaKey: false } });

      expect(callback).toHaveBeenCalledWith(imageId, false);
    });
  });

  describe('Background Deselection', () => {
    it('clears selection when clicking stage background', () => {
      selection.selectMultiple([imageId, 'other-image']);

      setupBackgroundDeselect(stage);

      // Simulate click on stage (not on shape)
      stage.fire('click', {
        target: stage,
        evt: {},
      });

      const selectionState = get(selection);
      expect(selectionState.selectedIds.size).toBe(0);
    });

    it('does not clear selection when clicking on shape', () => {
      selection.selectMultiple([imageId, 'other-image']);

      setupBackgroundDeselect(stage);

      // Simulate click on shape
      stage.fire('click', {
        target: image,
        evt: {},
      });

      const selectionState = get(selection);
      expect(selectionState.selectedIds.size).toBe(2);
    });

    it('calls onDeselect callback when background clicked', () => {
      const callback = vi.fn();

      selection.selectOne(imageId);

      setupBackgroundDeselect(stage, callback);

      stage.fire('click', {
        target: stage,
        evt: {},
      });

      expect(callback).toHaveBeenCalled();
    });

    it('cleanup removes background deselect handler', () => {
      selection.selectOne(imageId);

      const cleanup = setupBackgroundDeselect(stage);
      cleanup();

      stage.fire('click', {
        target: stage,
        evt: {},
      });

      const selectionState = get(selection);
      expect(selectionState.selectedIds.size).toBe(1);
    });
  });

  describe('Programmatic Selection', () => {
    it('selectImage selects single image', () => {
      selectImage(imageId);

      expect(isImageSelected(imageId)).toBe(true);
      expect(getSelectedCount()).toBe(1);
    });

    it('selectImage with multiSelect adds to selection', () => {
      selectImage('image-1');
      selectImage('image-2', true);

      expect(getSelectedCount()).toBe(2);
      expect(getSelectedImageIds()).toEqual(['image-1', 'image-2']);
    });

    it('deselectImage removes from selection', () => {
      selection.selectMultiple([imageId, 'other-image']);

      deselectImage(imageId);

      expect(isImageSelected(imageId)).toBe(false);
      expect(isImageSelected('other-image')).toBe(true);
    });

    it('toggleImageSelection toggles state', () => {
      toggleImageSelection(imageId);
      expect(isImageSelected(imageId)).toBe(true);

      toggleImageSelection(imageId);
      expect(isImageSelected(imageId)).toBe(false);
    });

    it('selectAllImages selects all provided IDs', () => {
      const allIds = ['img-1', 'img-2', 'img-3', 'img-4'];

      selectAllImages(allIds);

      expect(getSelectedCount()).toBe(4);
      expect(getSelectedImageIds()).toEqual(allIds);
    });

    it('clearAllSelection clears everything', () => {
      selection.selectMultiple(['img-1', 'img-2', 'img-3']);

      clearAllSelection();

      expect(getSelectedCount()).toBe(0);
      expect(getSelectedImageIds()).toEqual([]);
    });
  });

  describe('Query Functions', () => {
    it('getSelectedCount returns correct count', () => {
      expect(getSelectedCount()).toBe(0);

      selection.selectOne(imageId);
      expect(getSelectedCount()).toBe(1);

      selection.addToSelection('other-image');
      expect(getSelectedCount()).toBe(2);
    });

    it('getSelectedImageIds returns array of IDs', () => {
      selection.selectMultiple(['img-1', 'img-2', 'img-3']);

      const ids = getSelectedImageIds();

      expect(Array.isArray(ids)).toBe(true);
      expect(ids.length).toBe(3);
      expect(ids).toContain('img-1');
      expect(ids).toContain('img-2');
      expect(ids).toContain('img-3');
    });

    it('isImageSelected returns correct boolean', () => {
      expect(isImageSelected(imageId)).toBe(false);

      selection.selectOne(imageId);
      expect(isImageSelected(imageId)).toBe(true);

      selection.clearSelection();
      expect(isImageSelected(imageId)).toBe(false);
    });
  });

  describe('Edge Cases', () => {
    it('handles selecting non-existent image', () => {
      selectImage('non-existent-id');

      expect(getSelectedCount()).toBe(1);
      expect(isImageSelected('non-existent-id')).toBe(true);
    });

    it('handles deselecting non-selected image', () => {
      deselectImage('not-selected-id');

      expect(getSelectedCount()).toBe(0);
    });

    it('handles toggling same image multiple times', () => {
      toggleImageSelection(imageId);
      toggleImageSelection(imageId);
      toggleImageSelection(imageId);

      expect(isImageSelected(imageId)).toBe(true);
    });

    it('handles empty array in selectAllImages', () => {
      selectAllImages([]);

      expect(getSelectedCount()).toBe(0);
    });

    it('handles large selection sets', () => {
      const largeSet = Array.from({ length: 1000 }, (_, i) => `img-${i}`);

      selectAllImages(largeSet);

      expect(getSelectedCount()).toBe(1000);
    });
  });

  describe('Touch Events', () => {
    it('handles tap event same as click', () => {
      setupImageSelection(image, imageId);

      image.fire('tap', { evt: { ctrlKey: false, metaKey: false } });

      expect(isImageSelected(imageId)).toBe(true);
    });

    it('prevents event bubbling to stage', () => {
      setupImageSelection(image, imageId);
      setupBackgroundDeselect(stage);

      const clickEvent = new Event('click', { bubbles: true, cancelable: true });
      Object.defineProperty(clickEvent, 'cancelBubble', {
        writable: true,
        value: false,
      });

      image.fire('click', {
        evt: {
          ctrlKey: false,
          metaKey: false,
          ...clickEvent,
        },
      });

      // Image should be selected
      expect(isImageSelected(imageId)).toBe(true);
    });
  });
});