import { describe, it, expect, vi, beforeEach } from 'vitest';
import { GetCategoryIconPageQuery } from './GetCategoryIconPageQuery';
import { MediaService } from '@/lib/services/media/MediaService';
import { Result } from '@/lib/contracts/Result';
import { CategoryIconViewDataBuilder } from '@/lib/builders/view-data/CategoryIconViewDataBuilder';
import { mapToPresentationError } from '@/lib/contracts/page-queries/PresentationError';

// Mock dependencies
vi.mock('@/lib/services/media/MediaService', () => ({
  MediaService: vi.fn(class {
    getCategoryIcon = vi.fn();
  }),
}));

vi.mock('@/lib/builders/view-data/CategoryIconViewDataBuilder', () => ({
  CategoryIconViewDataBuilder: {
    build: vi.fn(),
  },
}));

vi.mock('@/lib/contracts/page-queries/PresentationError', () => ({
  mapToPresentationError: vi.fn(),
}));

describe('GetCategoryIconPageQuery', () => {
  let query: GetCategoryIconPageQuery;
  let mockServiceInstance: any;

  beforeEach(() => {
    vi.clearAllMocks();
    query = new GetCategoryIconPageQuery();
    mockServiceInstance = {
      getCategoryIcon: vi.fn(),
    };
    (MediaService as any).mockImplementation(function () {
      return mockServiceInstance;
    });
  });

  it('should return view data when service succeeds', async () => {
    const params = { categoryId: 'category-123' };
    const apiDto = { url: 'icon-url', data: 'base64-data' };
    const viewData = { url: 'icon-url', data: 'base64-data' };

    mockServiceInstance.getCategoryIcon.mockResolvedValue(Result.ok(apiDto));
    (CategoryIconViewDataBuilder.build as any).mockReturnValue(viewData);

    const result = await query.execute(params);

    expect(result.isOk()).toBe(true);
    expect(result.unwrap()).toEqual(viewData);
    expect(MediaService).toHaveBeenCalled();
    expect(mockServiceInstance.getCategoryIcon).toHaveBeenCalledWith('category-123');
    expect(CategoryIconViewDataBuilder.build).toHaveBeenCalledWith(apiDto);
  });

  it('should return mapped presentation error when service fails', async () => {
    const params = { categoryId: 'category-123' };
    const serviceError = { type: 'notFound' };
    const presentationError = 'notFound';

    mockServiceInstance.getCategoryIcon.mockResolvedValue(Result.err(serviceError));
    (mapToPresentationError as any).mockReturnValue(presentationError);

    const result = await query.execute(params);

    expect(result.isErr()).toBe(true);
    expect(result.getError()).toBe(presentationError);
    expect(mapToPresentationError).toHaveBeenCalledWith(serviceError);
  });

  it('should return serverError on exception', async () => {
    const params = { categoryId: 'category-123' };

    mockServiceInstance.getCategoryIcon.mockRejectedValue(new Error('Network error'));

    const result = await query.execute(params);

    expect(result.isErr()).toBe(true);
    expect(result.getError()).toBe('serverError');
  });

  it('should provide a static execute method', async () => {
    const params = { categoryId: 'category-123' };
    const apiDto = { url: 'icon-url', data: 'base64-data' };
    const viewData = { url: 'icon-url', data: 'base64-data' };

    mockServiceInstance.getCategoryIcon.mockResolvedValue(Result.ok(apiDto));
    (CategoryIconViewDataBuilder.build as any).mockReturnValue(viewData);

    const result = await GetCategoryIconPageQuery.execute(params);

    expect(result.isOk()).toBe(true);
    expect(result.unwrap()).toEqual(viewData);
  });
});