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

namespace UI
{
    public class SkillTreeUI : FullScreenUI
    {
        public SkillTreePageUI skillTreePageUIPrefab;
        public Transform skillTreePageUIParent; // 用于承载 SkillTreePageUI 实例的 Transform

        public List<SkillTreePageUI> skillTreePages = new List<SkillTreePageUI>();

        private int _index = 0;

        public int Index
        {
            get => _index;
            set
            {
                _index = value;
                if (skillTreePages.Count == 0)
                    return;
                while (_index < 0)
                {
                    _index += skillTreePages.Count;
                }

                while (_index >= skillTreePageUIParent.childCount)
                {
                    _index -= skillTreePageUIParent.childCount;
                }
            }
        }

        public SkillTreePageUI FocusedSkillTreePage => skillTreePages.Any() ? skillTreePages[Index] : null;

        private void Start()
        {
            var pageList = SkillTreeManager.Instance.GetAllTag();
            if (pageList == null)
                return;
            foreach (var page in pageList)
            {
                var pageUI = Instantiate(skillTreePageUIPrefab, skillTreePageUIParent);
                pageUI.GenerateAndLayoutAllSkillTrees(page);
                skillTreePages.Add(pageUI);
                pageUI.gameObject.SetActive(false);
            }

            FocusedSkillTreePage.gameObject.SetActive(true);
        }

        public void OnLeft()
        {
            FocusedSkillTreePage.gameObject.SetActive(false);
            Index--;
            FocusedSkillTreePage.gameObject.SetActive(true);
        }

        public void OnRight()
        {
            FocusedSkillTreePage.gameObject.SetActive(false);
            Index++;
            FocusedSkillTreePage.gameObject.SetActive(true);
        }
    }
}