using System.Collections.Generic;
using GB5Shared.Tree;

namespace FrameworkDAL.DTO.MenuGroup
{
    /// <summary>
    /// Flat MMENUGROUP row, also usable directly as a TreeHelper.ConvertToTree node.
    /// ParentGroupId carries the raw -1 sentinel from the DB; the BLL is responsible for
    /// setting Parent = null when ParentGroupId == -1 before calling ConvertToTree, mirroring
    /// MenuBLL's existing MMENU ParentId handling — this DTO does not do that translation itself.
    /// </summary>
    public class MenuGroupDTO : ITreeNode<MenuGroupDTO>
    {
        public int MenuGroupId { get; set; }
        public string GroupCode { get; set; } = string.Empty;
        public string GroupName { get; set; } = string.Empty;
        public int? ModuleId { get; set; }
        public int? MenuSetId { get; set; }
        public int ParentGroupId { get; set; } = -1;
        public string? ParentGroupIds { get; set; }
        public short? Levels { get; set; }
        public string IconName { get; set; } = string.Empty;
        public string? Remarks { get; set; }
        public short SortOrder { get; set; } = 9999;
        public byte Status { get; set; } = 1;
        public short Version { get; set; }
        public byte SourceType { get; set; } = 5;
        public int CreatedById { get; set; } = -1;
        public System.DateTime CreatedOn { get; set; }
        public int ModifiedById { get; set; } = -1;
        public System.DateTime ModifiedOn { get; set; }

        // ITreeNode<MenuGroupDTO> — Id/Code are read-only pass-throughs so Dapper maps
        // straight into MenuGroupId/GroupCode without a separate flat/tree DTO pair.
        public int Id => MenuGroupId;
        public string Code => GroupCode;
        public MenuGroupDTO? Parent { get; set; }
        public IList<MenuGroupDTO> children { get; set; } = new List<MenuGroupDTO>();

        /// <summary>Resolved leaf menus directly under this group — populated by
        /// MenuGroupBLL.GetMenuGroupTreeForSet after the tree walk, not by the DB query.</summary>
        public List<MenuGroupResolvedLeafDTO> Leaves { get; set; } = new();
    }
}