using Zurnal.RemaDateBase.DateDao;

internal interface IGroupRepository
{
    List<GroupDao> AllGroup { get; }

    public IEnumerable<GroupDao> AllGroups()
    {
        return AllGroup.Select(g => new GroupDao { GroupName = g.GroupName, Id = g.Id });
    }

    public bool RemoveGroupById(int groupId)
    {
        var group = AllGroup.FirstOrDefault(g => g.Id == groupId);
        if (group != null)
        {
            AllGroup.Remove(group);
            return true;
        }
        return false;
    }

    public GroupDao FindGroupById(int groupId)
    {
        return AllGroup.FirstOrDefault(g => g.Id == groupId);
    }

    public bool UpdateGroupById(int groupId, GroupDao updatedGroup)
    {
        if (updatedGroup == null) throw new ArgumentNullException(nameof(updatedGroup));

        var group = AllGroup.FirstOrDefault(g => g.Id == groupId);
        if (group != null)
        {
            group.GroupName = updatedGroup.GroupName; 
            return true;
        }
        return false;
    }

    public void DeleteGroup(int id)
    {
        var group = AllGroup.FirstOrDefault(g => g.Id == id);
        if (group != null)
        {
            AllGroup.Remove(group);
        }
    }

    public IEnumerable<GroupDao> GetAllGroups()
    {
        return AllGroup;
    }

    public void UpdateGroupName(int groupId, string name)
    {
        if (name == null) throw new ArgumentNullException(nameof(name));

        var group = AllGroup.FirstOrDefault(g => g.Id == groupId);
        if (group != null)
        {
            group.GroupName = name; 
        }
    }
}