using HxModel;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace HxUserManagement.Classes
{
    public class MenuTree:INotifyPropertyChanged
    {
        public event PropertyChangedEventHandler PropertyChanged;
        protected virtual void OnPropertyChanged(string propname)
        {
            if (PropertyChanged != null)
            {
                PropertyChanged(this, new PropertyChangedEventArgs(propname));
            }
        }

        public string Id { get; set; }

        /// <summary>
        /// 项目ID
        /// </summary>
        public string ProjectId { get; set; }

        /// <summary>
        /// 子节点ID
        /// </summary>
        public string ChildrenId { get; set; }

        /// <summary>
        /// 状态（0禁用，1启用）
        /// </summary> 
        public int State { get; set; }

        /// <summary>
        /// 层级
        /// </summary>
        public int Level { get; set; }

        /// <summary>
        /// 菜单名称
        /// </summary>
        public string Name { get; set; }

        /// <summary>
        /// 默认图片
        /// </summary>
        public string ImgDefault { get; set; }

        /// <summary>
        /// 点击后图片
        /// </summary>
        public string ImgChange { get; set; }

        /// <summary>
        /// 排序
        /// </summary>
        public int Sequence { get; set; }

        /// <summary>
        /// 创建人
        /// </summary>
        public string CreatName { get; set; }

        /// <summary>
        /// 创建时间
        /// </summary>
        public DateTime CreateTime { get; set; }

        /// <summary>
        /// 修改人
        /// </summary>
        public string ModifyName { get; set; }

        /// <summary>
        /// 修改时间
        /// </summary>
        public DateTime? ModifyTime { get; set; }
        public MenuTree Parent { get; set; }
        public List<MenuTree> Children { get; set; }

        public bool? _isChecked;
        /// <summary>
        /// CheckBox是否选中
        /// </summary>
        public bool? IsChecked
        {
            get
            {
                return _isChecked;
            }
            set
            {
                SetIsChecked(value, true, true);
            }
        }

        private bool _isExpanded;
        public bool IsExpanded
        {
            get
            {
                return _isExpanded;
            }
            set
            {
                _isExpanded = value;
                OnPropertyChanged("IsExpanded");
            }
        }

        public MenuTree()
        {
            Level = -1;
            IsExpanded = true;
            //_isChecked = false;
            this.Children = new List<MenuTree>();
        }
        public MenuTree(MenuModel menu)
        {
            this.Id = menu.Id;
            this.ProjectId = menu.ProjectId;
            this.ChildrenId = menu.ChildrenId;
            this.State = menu.State;
            this.Level = menu.Level;
            this.Name = menu.Name;
            this.ImgDefault = menu.ImgDefault;
            this.ImgChange = menu.ImgChange;
            this.Sequence = menu.Sequence;
            this.CreatName = menu.CreatName;
            this.CreateTime = menu.CreateTime;
            this.ModifyName = menu.ModifyName;
            this.ModifyTime = menu.ModifyTime;
            this.IsExpanded = true;
            //_isChecked = null;
            this.Children = new List<MenuTree>();
        }

        private void SetIsChecked(bool? value, bool checkedChildren, bool checkedParent)
        {
            if (_isChecked == value) return;
            _isChecked = value;
            //选中和取消子类
            if (checkedChildren && value.HasValue && Children != null)
                Children.ForEach(ch => ch.SetIsChecked(value, true, false));

            //选中和取消父类
            if (checkedParent && this.Parent != null)
                this.Parent.CheckParentCheckState();

            //通知更改
            OnPropertyChanged("IsChecked");
        }

        /// <summary>
        /// 检查父类是否选 中
        /// 如果父类的子类中有一个和第一个子类的状态不一样父类ischecked为null
        /// </summary>
        private void CheckParentCheckState()
        {
            List<MenuTree> checkedItems = new List<MenuTree>();
            string checkedNames = string.Empty;
            bool? _currentState = this.IsChecked;
            bool? _firstState = null;
            for (int i = 0; i < this.Children.Count(); i++)
            {
                bool? childrenState = this.Children[i].IsChecked;
                if (i == 0)
                {
                    _firstState = childrenState;
                }
                else if (_firstState != childrenState)
                {
                    _firstState = null;
                }
            }
            if (_firstState != null) _currentState = _firstState;
            SetIsChecked(_firstState, false, true);
        }

        /// <summary>
        /// 创建树
        /// </summary>
        /// <param name="children"></param>
        /// <param name="isChecked"></param>

        public void CreateTreeWithChildren(MenuTree children, bool? isChecked)
        {
            this.Children.Add(children);
            //必须先把孩子加入再为Parent赋值，
            //否则当只有一个子节点时Parent的IsChecked状态会出错
            //if(children.Name == )
            children.Parent = this;
            children.IsChecked = isChecked;
        }
    }
}