/**
 * Tests for grouping operations
 * Tests group creation, moving groups, ungrouping
 */

import { describe, it, expect, beforeEach, vi } from 'vitest';
import { get } from 'svelte/store';
import type { Group } from '$lib/api/groups';
import {
  createGroupFromSelection,
  canCreateGroup,
  getGroupColorSuggestions,
  generateDefaultGroupName,
} from '$lib/canvas/operations/group';
import { ungroupImages, removeImagesFromGroup } from '$lib/canvas/operations/ungroup';
import { groups, groupsLoading, groupsError, groupCount } from '$lib/stores/groups';

// Mock API
vi.mock('$lib/api/groups', () => ({
  createGroup: vi.fn().mockResolvedValue({
    id: 'group-1',
    board_id: 'board-1',
    name: 'Test Group',
    color: '#FF5733',
    annotation: 'Test',
    member_count: 2,
    created_at: new Date().toISOString(),
    updated_at: new Date().toISOString(),
  }),
  listGroups: vi.fn().mockResolvedValue([]),
  updateGroup: vi.fn().mockResolvedValue({
    id: 'group-1',
    name: 'Updated',
    color: '#00FF00',
  }),
  deleteGroup: vi.fn().mockResolvedValue(undefined),
}));

describe('Group Creation', () => {
  beforeEach(() => {
    vi.clearAllMocks();
  });

  it('can create group from selection', () => {
    const selectedIds = ['img1', 'img2'];
    expect(canCreateGroup(selectedIds)).toBe(true);
  });

  it('cannot create group with no selection', () => {
    expect(canCreateGroup([])).toBe(false);
  });

  it('creates group from selection', async () => {
    const selectedIds = ['img1', 'img2'];

    const group = await createGroupFromSelection(selectedIds, 'board-1', {
      name: 'Test Group',
      color: '#FF5733',
      annotation: 'Test annotation',
    });

    expect(group).not.toBeNull();
    expect(group?.name).toBe('Test Group');
  });

  it('calls callback on group creation', async () => {
    const callback = vi.fn();

    await createGroupFromSelection(['img1', 'img2'], 'board-1', {
      name: 'Test Group',
      color: '#FF5733',
      onGroupCreate: callback,
    });

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

  it('generates default group names', () => {
    const existingGroups: Group[] = [
      {
        id: '1',
        board_id: 'board-1',
        name: 'Group 1',
        color: '#FF5733',
        annotation: null,
        member_count: 2,
        created_at: new Date().toISOString(),
        updated_at: new Date().toISOString(),
      },
      {
        id: '2',
        board_id: 'board-1',
        name: 'Group 2',
        color: '#FF5733',
        annotation: null,
        member_count: 3,
        created_at: new Date().toISOString(),
        updated_at: new Date().toISOString(),
      },
    ];

    const newName = generateDefaultGroupName(existingGroups);
    expect(newName).toBe('Group 3');
  });

  it('provides color suggestions', () => {
    const colors = getGroupColorSuggestions();

    expect(colors).toBeInstanceOf(Array);
    expect(colors.length).toBeGreaterThan(0);
    expect(colors[0]).toMatch(/^#[0-9A-Fa-f]{6}$/);
  });
});

describe('Groups Store', () => {
  beforeEach(() => {
    groups.clear();
    vi.clearAllMocks();
  });

  it('starts with empty state', () => {
    const state = get(groups);

    expect(state.groups).toEqual([]);
    expect(state.loading).toBe(false);
    expect(state.error).toBeNull();
  });

  it('loads groups', async () => {
    await groups.load('board-1');

    expect(get(groupsLoading)).toBe(false);
  });

  it('creates group', async () => {
    const groupData = {
      name: 'New Group',
      color: '#FF5733',
      image_ids: ['img1', 'img2'],
    };

    const group = await groups.create('board-1', groupData);

    expect(group).not.toBeNull();
    expect(get(groupCount)).toBe(1);
  });

  it('handles creation error', async () => {
    const { createGroup } = await import('$lib/api/groups');
    vi.mocked(createGroup).mockRejectedValueOnce(new Error('API Error'));

    const group = await groups.create('board-1', {
      name: 'Test',
      color: '#FF5733',
      image_ids: ['img1'],
    });

    expect(group).toBeNull();
    expect(get(groupsError)).toBeTruthy();
  });

  it('deletes group', async () => {
    // First create a group
    await groups.create('board-1', {
      name: 'Test',
      color: '#FF5733',
      image_ids: ['img1'],
    });

    expect(get(groupCount)).toBe(1);

    // Then delete it
    await groups.delete('board-1', 'group-1');

    expect(get(groupCount)).toBe(0);
  });

  it('clears all groups', () => {
    groups.clear();

    const state = get(groups);
    expect(state.groups).toEqual([]);
    expect(state.loading).toBe(false);
    expect(state.error).toBeNull();
  });
});

describe('Ungroup Operations', () => {
  beforeEach(() => {
    vi.clearAllMocks();
  });

  it('ungroups images', async () => {
    const result = await ungroupImages('board-1', 'group-1');

    expect(result).toBe(true);
  });

  it('handles ungroup error', async () => {
    const { deleteGroup } = await import('$lib/api/groups');
    vi.mocked(deleteGroup).mockRejectedValueOnce(new Error('API Error'));

    const result = await ungroupImages('board-1', 'group-1');

    expect(result).toBe(false);
  });

  it('removes specific images from group', async () => {
    vi.mock('$lib/api/client', () => ({
      apiClient: {
        patch: vi.fn().mockResolvedValue({}),
      },
    }));

    const result = await removeImagesFromGroup('board-1', 'group-1', ['img1', 'img2']);

    expect(result).toBe(true);
  });
});