using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.Linq;

namespace Infrastructure.Domain
{
    public abstract class BaseTreeEntity<T> : BaseEntity where T : BaseTreeEntity<T>
    {
        [Display(Name = "名称")]
        public string Name { get; set; }

        [Display(Name = "编号")]
        public string Number { get; set; }

        [Display(Name = "路径")]
        public string Path { get; set; }

        [Display(Name = "上级Id")]
        public Guid? ParentId { get; set; }

        public T Parent { get; set; }

        [System.Diagnostics.CodeAnalysis.SuppressMessage("Usage", "CA2227:集合属性应为只读", Justification = "<挂起>")]
        public List<T> Children { get; set; } = new List<T>();

        public string GetFullName(string separator = "→")
        {
            var names = new List<string>();
            var item = this;
            while (item != null)
            {
                names.Add(item.Name);
                if (item.Parent == null || item.Parent.Id == this.Id)
                {
                    break;
                }
                item = item.Parent;
            }
            names.Reverse();
            return string.Join(separator, names);
        }

        public void UpdatePath()
        {
            var paths = new List<string>();
            var current = this;
            while (true)
            {
                paths.Add(current.Number);
                if (current.Parent != null)
                {
                    current = current.Parent;
                }
                else
                {
                    break;
                }
            }
            paths.Reverse();
            this.Path = string.Join("/", paths.ToArray());
            if (this.Children.Any())
            {
                foreach (var item in this.Children)
                {
                    item.UpdatePath();
                }
            }
        }
    }
}