using System;
using System.Collections.Generic;
using System.Linq;
using UnityEngine;

namespace TyphoonUI
{
    public class HierarchyIndex : List<int>, IComparable<HierarchyIndex>
    {
        public int CompareTo(HierarchyIndex other)
        {
            for (int i = 0; i < this.Count && i < other.Count; i++)
            {
                var a = this[i];
                var b = other[i];
                if (a != b)
                {
                    //继续比较
                    return a.CompareTo(b);
                }
            }

            return this.Count.CompareTo(other.Count);
        }
    }

    public static class Extension
    {
        //获取组件层级路径
        public static int GetComponentIndex(this Component component)
        {
            var coms = component.gameObject.GetComponents<Component>().ToList();
            return coms.IndexOf(component);
        }

        public static HierarchyIndex GetHierarchySiblingIndices(this GameObject target)
        {
            var stack = new Stack<int>();
            var node = target.transform;
            while (node != null)
            {
                var index = node.GetSiblingIndex();
                stack.Push(index);
                node = node.parent;
            }

            var result = new HierarchyIndex();
            while (stack.Count > 0)
            {
                result.Add(stack.Pop());
            }

            return result;
        }

        public static string GetHierarchyIndexString(this GameObject target)
        {
            var result = string.Empty;
            var node = target.transform;
            while (node != null)
            {
                result += node.GetSiblingIndex().ToString().PadLeft(4, '0');
                node = node.parent;
            }

            return result;
        }

        public static string GetHierarchyPath(this GameObject target)
        {
            var result = $"{target.gameObject.name}";
            var node = target.transform;
            while (node.parent != null)
            {
                result = $"{node.parent.name}/{result}";
                node = node.parent;
            }

            return result;
        }
    }
}