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

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

        public List<SkillTreePageUI> skillTreePages = new();

        private int _index;

        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.skillTreeUI = this;
                pageUI.GenerateAndLayoutAllSkillTrees(page);
                skillTreePages.Add(pageUI);
                pageUI.gameObject.SetActive(false);
            }

            FocusedSkillTreePage?.gameObject.SetActive(true);
        }

        public override void TickUI()
        {
            if (skillTreeNodeInformationUI.gameObject.activeInHierarchy && Input.GetKeyDown(KeyCode.Escape))
                skillTreeNodeInformationUI.OnHide();
            else
                base.TickUI();
        }

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

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

        public void OnShowNodeInformation(SkillTreeNodeUI skillTreeNodeUI)
        {
            skillTreeNodeInformationUI.Init(skillTreeNodeUI);
            skillTreeNodeInformationUI.gameObject.SetActive(true);
        }
    }
}