using System.Collections.Generic;
using TH1_Core.Events;
using TH1_Core.Managers;
using TH1_Logic.MatchConfig;
using TH1_UI.Controller.Base;
using TH1_UI.View.Outside;
using UnityEngine;

namespace TH1_UI.Controller.Outside
{
    public class UIOutsideWikiController : ViewController<UIOutsideWikiView>
    {
        public UIOutsideWikiController() { }

        private ShowUIOutsideWiki _evt;
        private bool _hasBigSelect;
        private bool _hasSmallSelect;
        private bool _currentBigHasSmalls;
        private WikiType _selectedBigType;
        private WikiType _selectedSmallType;
        private readonly List<WikiType> _requiredTypes = new List<WikiType>(2);
        private readonly List<WikiItem> _wikiItemBuffer = new List<WikiItem>();

        protected override void RegisterEventCallback()
        {
            base.RegisterEventCallback();
            if (WindowScript != null)
            {
                WindowScript.OnBigSelectClick += _OnBigSelectClick;
                WindowScript.OnSmallSelectClick += _OnSmallSelectClick;
                WindowScript.OnWikiListItemClick += _OnWikiListItemClick;
                WindowScript.OnBtnCloseClick += _OnBtnCloseClick;
            }
        }

        protected override void UnregisterEventCallback()
        {
            if (WindowScript != null)
            {
                WindowScript.OnBigSelectClick -= _OnBigSelectClick;
                WindowScript.OnSmallSelectClick -= _OnSmallSelectClick;
                WindowScript.OnWikiListItemClick -= _OnWikiListItemClick;
                WindowScript.OnBtnCloseClick -= _OnBtnCloseClick;
            }
            base.UnregisterEventCallback();
        }

        private void _OnBtnCloseClick()
        {
            Close();
        }

        protected override void OnOpen()
        {
            base.OnOpen();
            // Wiki 是浮窗，需要置顶到 OutsideUI 层最上方，避免被其它 OutsideUI view 覆盖
            if (WindowObj != null)
            {
                WindowObj.transform.SetAsLastSibling();
            }
            ResetSelection();
            if (_openParameter is ShowUIOutsideWiki evt)
            {
                _evt = evt;
                WindowScript?.SetContent(evt);
            }
            else
            {
                Debug.LogWarning("[UIOutsideWikiController] Opened without valid parameters.");
                WindowScript?.SetContent(new ShowUIOutsideWiki());
            }

            // 默认选中第一个 BigSelect（其点击回调会进一步触发 Small 默认选中和列表首项展示）
            WindowScript?.SelectFirstBig();
        }

        private void _OnBigSelectClick(WikiType wikiType)
        {
            _selectedBigType = wikiType;
            _hasBigSelect = true;
            // 切换 Big 时重置 Small 选中（旧 Small 不再属于当前 Big group）
            _hasSmallSelect = false;
            _currentBigHasSmalls = WindowScript != null && WindowScript.ShowSmallSelectButtonsForBig(wikiType);

            // 当前 Big 下若有 Small 子分类，默认选中第一个（其点击回调会刷新列表并选首项）
            if (_currentBigHasSmalls)
            {
                if (WindowScript != null && WindowScript.SelectFirstSmallIfAny()) return;
            }
            RefreshWikiList();
        }

        private void _OnSmallSelectClick(WikiType wikiType)
        {
            _selectedSmallType = wikiType;
            _hasSmallSelect = true;
            RefreshWikiList();
        }

        private void _OnWikiListItemClick(WikiItem wikiItem)
        {
            WindowScript?.SetTitle(wikiItem);
        }

        private void RefreshWikiList()
        {
            if (WindowScript == null) return;

            // 必须先选 Big；如果当前 Big 有 Small 则还需选中 Small；否则清空列表。
            if (!_hasBigSelect || (_currentBigHasSmalls && !_hasSmallSelect))
            {
                _wikiItemBuffer.Clear();
                WindowScript.ClearWikiList();
                WindowScript.ClearTitle();
                return;
            }

            if (Table.Instance?.WikiData == null)
            {
                _wikiItemBuffer.Clear();
                WindowScript.ClearWikiList();
                WindowScript.ClearTitle();
                return;
            }

            _requiredTypes.Clear();
            _requiredTypes.Add(_selectedBigType);
            if (_currentBigHasSmalls) _requiredTypes.Add(_selectedSmallType);

            Table.Instance.WikiData.FindByTypes(_requiredTypes, _wikiItemBuffer);
            WindowScript.RefreshWikiList(_wikiItemBuffer);
            WindowScript.ClearTitle();

            // 列表非空时，默认选中第一项并展示其 Content
            WindowScript.SelectFirstWikiListItemIfAny();
        }

        private void ResetSelection()
        {
            _hasBigSelect = false;
            _hasSmallSelect = false;
            _currentBigHasSmalls = false;
            _requiredTypes.Clear();
            _wikiItemBuffer.Clear();
        }

        public override bool Close()
        {
            WindowScript?.OnCloseView();
            ResetSelection();
            return base.Close();
        }
    }
}