import { IUseCase } from '../../../core/application/IUseCase';
import { Result } from '../../../core/domain/Result';
import { DomainError, NotFoundError, ValidationError } from '../../../core/domain/DomainError';
import { IListRepository } from '../domain/IListRepository';
import { ListItem } from '../domain/ListItem';
import { ToggleListItemDto } from './dtos/ListDtos';

export class ToggleListItemUseCase implements IUseCase<ToggleListItemDto, ListItem> {
  constructor(private readonly listRepository: IListRepository) {}

  public async execute(dto: ToggleListItemDto): Promise<Result<ListItem, DomainError>> {
    if (!dto.itemId) {
      return Result.fail(new ValidationError('Item ID is required'));
    }

    const item = await this.listRepository.findItemById(dto.itemId);
    if (!item) {
      return Result.fail(new NotFoundError(`Item with ID ${dto.itemId} not found`));
    }

    if (dto.status) {
      item.updateStatus(dto.status);
    } else {
      item.toggleCompleted();
    }

    await this.listRepository.saveItem(item);
    return Result.ok(item);
  }
}