Demo/Domain/UseCase/GroupUseCase.cs

using Demo.Data.Repository;
using Demo.domain.Models;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Demo.Domain.UseCase
{
    public class GroupUseCase:IGroupUseCase
    {

        private IGroupRepository _repositoryGroupImpl;
        
        public GroupUseCase(IGroupRepository groupRepository)
        {
            _repositoryGroupImpl = groupRepository;
        }

        public List<Group> GetAllGroups() => _repositoryGroupImpl.GetAllGroup()
            .Select(it => new Group { Id  = it.Id, Name = it.Name}).ToList();

        public Group UpdateGroupName(Group group) {

            GroupLocalEntity groupLocalEntity = new GroupLocalEntity
            {
                Id = group.Id,
                Name = group.Name
            };
            GroupLocalEntity? result = _repositoryGroupImpl.UpdateGroupName(groupLocalEntity);
            if (result == null)
            {
                throw new Exception("");
            }
            return new Group
            {
                Id = result.Id,
                Name = result.Name
            };

        }

        public bool RemoveGroupById(int groupId) {

            return _repositoryGroupImpl.RemoveGroupById(groupId);
        }

        public bool CreateGroup(Group group) {

            GroupLocalEntity? groupLocalEntity = new GroupLocalEntity{Id = group.Id, Name = group.Name};
            _repositoryGroupImpl.CreateGroup(groupLocalEntity);
            if (groupLocalEntity != null) return false;
            return true;
        }

        public Group GetGroupById(int groupId) {

            GroupLocalEntity? groupLocalEntity = _repositoryGroupImpl.GetGroupById(groupId);
            if (groupLocalEntity == null) throw new Exception("");
            return new Group { Id = groupLocalEntity.Id, Name = groupLocalEntity.Name };
        }
    }
}