import { describe, it, expect, vi, type Mock } from 'vitest';
import { GetAnalyticsMetricsUseCase, type GetAnalyticsMetricsInput, type GetAnalyticsMetricsOutput } from './GetAnalyticsMetricsUseCase';
import type { IPageViewRepository } from '../../domain/repositories/IPageViewRepository';
import type { Logger, UseCaseOutputPort } from '@core/shared/application';
import { Result } from '@core/shared/application/Result';

describe('GetAnalyticsMetricsUseCase', () => {
  let pageViewRepository: {
    save: Mock;
    findById: Mock;
    findByEntityId: Mock;
    findBySessionId: Mock;
    countByEntityId: Mock;
    getUniqueVisitorsCount: Mock;
    getAverageSessionDuration: Mock;
    getBounceRate: Mock;
  };
  let logger: Logger;
  let output: UseCaseOutputPort<GetAnalyticsMetricsOutput> & { present: Mock };
  let useCase: GetAnalyticsMetricsUseCase;

  beforeEach(() => {
    pageViewRepository = {
      save: vi.fn(),
      findById: vi.fn(),
      findByEntityId: vi.fn(),
      findBySessionId: vi.fn(),
      countByEntityId: vi.fn(),
      getUniqueVisitorsCount: vi.fn(),
      getAverageSessionDuration: vi.fn(),
      getBounceRate: vi.fn(),
    } as unknown as IPageViewRepository as any;

    logger = {
      debug: vi.fn(),
      info: vi.fn(),
      warn: vi.fn(),
      error: vi.fn(),
    } as unknown as Logger;

    output = {
      present: vi.fn(),
    };

    useCase = new GetAnalyticsMetricsUseCase(
      pageViewRepository as unknown as IPageViewRepository,
      logger,
      output,
    );
  });

  it('presents default metrics and logs retrieval when no input is provided', async () => {
    const result = await useCase.execute();

    expect(result.isOk()).toBe(true);
    expect(output.present).toHaveBeenCalledWith({
      pageViews: 0,
      uniqueVisitors: 0,
      averageSessionDuration: 0,
      bounceRate: 0,
    });
    expect((logger.info as unknown as Mock)).toHaveBeenCalled();
  });

  it('uses provided date range and presents error when execute throws', async () => {
    const input: GetAnalyticsMetricsInput = {
      startDate: new Date('2024-01-01'),
      endDate: new Date('2024-01-31'),
    };

    // Simulate an error by temporarily spying on logger.info to throw
    (logger.info as unknown as Mock).mockImplementation(() => {
      throw new Error('Logging failed');
    });

    const result = await useCase.execute(input);

    expect(result.isErr()).toBe(true);
    expect((logger.error as unknown as Mock)).toHaveBeenCalled();
  });
});