import { describe, it, expect, vi, type Mock } from 'vitest';
import { RecordEngagementUseCase, type RecordEngagementInput } from './RecordEngagementUseCase';
import type { IEngagementRepository } from '../../domain/repositories/IEngagementRepository';
import { EngagementEvent } from '../../domain/entities/EngagementEvent';
import type { Logger } from '@core/shared/application';
import type { EngagementAction, EngagementEntityType } from '../../domain/types/EngagementEvent';

describe('RecordEngagementUseCase', () => {
  let engagementRepository: {
    save: Mock;
  };
  let logger: Logger;
  let useCase: RecordEngagementUseCase;

  beforeEach(() => {
    engagementRepository = {
      save: vi.fn(),
    } as unknown as IEngagementRepository as any;

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

    useCase = new RecordEngagementUseCase(
      engagementRepository as unknown as IEngagementRepository,
      logger,
    );
  });

  it('creates and saves an EngagementEvent and returns its id and weight', async () => {
    const input: RecordEngagementInput = {
      action: 'view' as EngagementAction,
      entityType: 'league' as EngagementEntityType,
      entityId: 'league-1',
      actorId: 'driver-1',
      actorType: 'driver',
      sessionId: 'session-1',
      metadata: { foo: 'bar' },
    };

    engagementRepository.save.mockResolvedValue(undefined);

    const result = await useCase.execute(input);

    expect(engagementRepository.save).toHaveBeenCalledTimes(1);
    const saved = (engagementRepository.save as unknown as Mock).mock.calls[0][0] as EngagementEvent;

    expect(saved).toBeInstanceOf(EngagementEvent);
    expect(saved.id).toBeDefined();
    expect(saved.entityId).toBe(input.entityId);
    expect(saved.entityType).toBe(input.entityType);
    expect(result.eventId).toBe(saved.id);
    expect(typeof result.engagementWeight).toBe('number');
    expect((logger.info as unknown as Mock)).toHaveBeenCalled();
  });

  it('logs and rethrows when repository save fails', async () => {
    const input: RecordEngagementInput = {
      action: 'view' as EngagementAction,
      entityType: 'league' as EngagementEntityType,
      entityId: 'league-1',
      actorType: 'anonymous',
      sessionId: 'session-1',
    };

    const error = new Error('DB error');
    engagementRepository.save.mockRejectedValue(error);

    await expect(useCase.execute(input)).rejects.toThrow('DB error');
    expect((logger.error as unknown as Mock)).toHaveBeenCalled();
  });
});