using System;
using System.Collections.Generic;
using System.Text;
using AibisDream.Framework;
using AibisDream.Kit;
using TMPro;
using UnityEngine;

namespace AibisDream
{
    public class DialogCanvasManager : Singleton<DialogCanvasManager>, IDialogView
    {
        #region 引用

        private readonly Dictionary<DialogViewType, IDialogView> _dialogViewDict = new();
        private IDialogView _defaultView;
        private IDialogView _showingView;

        private IActionController _autoNext;
        private IActionController _block;
        private IActionController _hideDialog;

        public TMP_Text widthEstimation;

        #endregion

        #region 参数

        [SerializeField] private float blockDuration;
        [SerializeField] private float autoSkipDelay;
        [SerializeField] private float autoHideDuration;

        private bool _isNextAutoSkip;
        private bool _isNextBlocked;

        #endregion

        private readonly List<IUnRegister> _rmvList = new();

        public override void OnSingletonInit()
        {
            InitEvent();
        }

        private void Start()
        {
            // 默认对话框直接加载
            // var box = transform.Find("Dialog Box").GetComponent<IDialogView>();
            // RegisterDialogView(DialogViewType.OldBox, box);
            var centerText = transform.Find("Center Text").GetComponent<IDialogView>();
            RegisterDialogView(DialogViewType.CenterText, centerText);
            var centerOption = transform.Find("Center Option").GetComponent<IDialogView>();
            RegisterDialogView(DialogViewType.CenterOption, centerOption);
            var bubbleGroup = transform.Find("Bubble Group").GetComponent<IDialogView>();
            RegisterDialogView(DialogViewType.StandardBubble, bubbleGroup);
            
            _defaultView = _dialogViewDict[DialogViewType.StandardBubble];
        }

        private void InitEvent()
        {
            // 记录相关
            _rmvList.Add(
                EnumEventSystem.Global.Register<DialogEventEnum, DialogText>(DialogEventEnum.LineStart,
                    AddDialogueLine));
            _rmvList.Add(
                EnumEventSystem.Global.Register<DialogEventEnum, DialogText>(DialogEventEnum.OptionSelected,
                    AddDialogueLine));
            _rmvList.Add(EnumEventSystem.Global.Register(EventEnum.NextYarn, CleanDialogHistory));

            // 文本显示事件
            _rmvList.Add(EnumEventSystem.Global.Register(DialogEventEnum.LineShown, OnTextShown));
            _rmvList.Add(EnumEventSystem.Global.Register(DialogEventEnum.LineEnd, OnTextEnd));
        }

        private void OnTextShown()
        {
            // 阻塞部分
            _isNextBlocked = true;
            _block = ActionKit.Delay(blockDuration, () =>
                {
                    _isNextBlocked = false;
                    _block = null;
                }
            ).Start(this);

            // 自动跳过部分
            if (DialogController.Instance.quickRunMode) return;

            if (DialogController.Instance.autoRunMode || _isNextAutoSkip)
            {
                _autoNext = ActionKit.Delay(autoSkipDelay, () =>
                {
                    _autoNext = null;
                    NextStep();
                }).Start(this);
                _isNextAutoSkip = false;
            }
        }

        private void OnTextEnd()
        {
            _block?.Deinit();
            _block = null;
            _isNextBlocked = false;

            _autoNext?.Deinit();
            _autoNext = null;
        }

        public override void OnSingletonDestroy()
        {
            // 销毁前处理事件
            _rmvList.ForEach(item => item.UnRegister());
        }

        #region 对话结束后隐藏

        private void OnEnable()
        {
            DialogController.OnDialogueComplete += HideDialog;
        }

        private void OnDisable()
        {
            DialogController.OnDialogueComplete -= HideDialog;
        }

        #endregion

        #region 对话框相关处理

        /// <summary>
        /// 注册对话框
        /// </summary>
        /// <param name="viewType"></param>
        /// <param name="dialogView"></param>
        public void RegisterDialogView(DialogViewType viewType, IDialogView dialogView)
        {
            _dialogViewDict.Add(viewType, dialogView);
        }

        /// <summary>
        /// 注销对话框
        /// </summary>
        /// <param name="viewType"></param>
        public void UnregisterDialogView(DialogViewType viewType)
        {
            _dialogViewDict.Remove(viewType);
        }

        #endregion

        #region 对话框接口

        public void ShowLine(string dialogLine, CharacterVo character, Action nextStep, string lineId,
            bool isAutoSkip = false)
        {
            _isNextAutoSkip = isAutoSkip;
            // 根据DialogViewType确定在哪个对话框显示
            if (character.dialogViewType == DialogViewType.Default)
            {
                if (_showingView != _defaultView)
                {
                    _showingView?.HideDialog();
                }
                else
                {
                    _hideDialog?.Deinit();
                    _hideDialog = null;
                }

                _showingView = _defaultView;
                
                _showingView.ShowLine(dialogLine, character, nextStep, lineId, isAutoSkip);
            }
            else if (_dialogViewDict.TryGetValue(character.dialogViewType, out var view))
            {
                if (_showingView != view)
                {
                    _showingView?.HideDialog();
                }
                else
                {
                    _hideDialog?.Deinit();
                    _hideDialog = null;
                }

                _showingView = view;

                // 对于指定了对话框的，就在指定对话框显示
                view.ShowLine(dialogLine, character, nextStep, lineId, isAutoSkip);
            }
            else
            {
                Debug.Log($"{character.dialogViewType.ToString()}类型对话框不存在");
            }
        }

        public void ShowOptions(DialogOption[] dialogueOptions)
        {
            var viewType = dialogueOptions[0].Character.dialogViewType;
            // 根据状况选择不同的选择框
            if (viewType == DialogViewType.Default)
            {
                if (_showingView != _defaultView)
                {
                    _showingView?.HideDialog();
                }
                else
                {
                    _hideDialog?.Deinit();
                    _hideDialog = null;
                }
                _showingView = _defaultView;
                
                _showingView.ShowOptions(dialogueOptions);
            }
            else if(_dialogViewDict.TryGetValue(viewType, out var view))
            {
                if (_showingView != view)
                {
                    _showingView?.HideDialog();
                }
                else
                {
                    _hideDialog?.Deinit();
                    _hideDialog = null;
                }
                _showingView = view;
                _showingView.ShowOptions(dialogueOptions);
            }
        }

        public void HideDialog()
        {
            _showingView?.HideDialog();
        }

        public bool TrySkipLine(bool isForceSkip = false)
        {
            if (_isNextBlocked)
            {
                return true;
            }

            return _showingView != null && _showingView.TrySkipLine(isForceSkip);
        }

        public void NextStep()
        {
            var view = _showingView;
            _hideDialog = ActionKit.Delay(autoHideDuration, () =>
            {
                _hideDialog = null;
                view.HideDialog();
            }).Start(this);
            _showingView?.NextStep();
        }

        public void OnLocalizationChanged(string value)
        {
        }

        public void SwitchDialogView(DialogViewType dialogViewType)
        {
            if (_dialogViewDict.TryGetValue(dialogViewType, out var view))
            {
                _defaultView?.HideDialog();
                _showingView?.HideDialog();
                _defaultView = view;
            }
            else
            {
                Debug.Log($"{dialogViewType.ToString()}类型对话框不存在");
            }
        }

        #endregion

        #region 对话回顾

        private StringBuilder DialogRecord => UIManager.Instance.GetPanel<RecordPanel>().recordStr;

        /// <summary>
        /// 记录对话
        /// </summary>
        /// <param name="line">对话</param>
        private void AddDialogueLine(DialogText line)
        {
            DialogRecord.Append(line.GetDialogText());
        }

        private void CleanDialogHistory()
        {
            DialogRecord.Clear();
        }

        public void CloseCanvas()
        {
            gameObject.SetActive(false);
        }

        public void OpenCanvas()
        {
            gameObject.SetActive(true);
        }

        #endregion

        public float EstimateTextWidth(string text, float fontSize)
        {
            widthEstimation.fontSize = fontSize;
            widthEstimation.text = text;
            widthEstimation.ForceMeshUpdate();
            return widthEstimation.preferredWidth;
        }
    }

    public enum DialogViewType
    {
        Default,
        Bubble,
        OldBox,
        Screen,
        CenterText,
        CenterOption,
        Task,
        StandardBubble
    }
}