using System;
using System.Threading;
using System.Threading.Tasks;
using Febucci.UI.Core;
using TMPro;
using UnityEngine;
using UnityEngine.UI;
using AibisDream.Framework;
using AibisDream.Utility;

namespace AibisDream
{
    public class OnelineBox : MonoBehaviour, ILineView
    {
        [SerializeField] private TypewriterCore content;
        [SerializeField] private GameObject box;

        [Header("排版参数")]
        [SerializeField] private int maxWidth = 800;
        [SerializeField] private int minWidth = 10;

        private LayoutElement _contentLayoutElement;
        private TMP_Text _contentText;
        private RectTransform _rectTransform;
        private CancellationTokenSource _autoHideToken;
        private event Action OnTextShowed;
        private bool _isInitialized;

        // ---------------------------- 显示逻辑 ----------------------------
        
        public void RunLine(LineSyncToken syncToken)
        {
            // 先中断结束事件
            _autoHideToken?.Cancel();
            _autoHideToken = null;

            // 注册事件
            OnTextShowed += syncToken.TextShown;
            syncToken.SkipTextAnima += () => content.SkipTypewriter();
            syncToken.OnAdvance += AfterAdvance;

            // 播放文字
            content.TextAnimator.SetText(string.Empty);
            var lineText = GetOneLineText(syncToken.lineInfo);
            box.SetActive(true);
            HandleLayout(lineText);
            content.ShowText(lineText);
            syncToken.TextStart();
        }

        private string GetOneLineText(LineInfo lineInfo)
        {
            if (string.IsNullOrEmpty(lineInfo.character.GetActorName()))
            {
                return lineInfo.lineText;
            }

            return $"<notype>{lineInfo.character.GetActorName()}: </notype>{lineInfo.lineText}";
        }

        private void HandleLayout(string line)
        {
            if (!_isInitialized)
            {
                InitRefs();
            }

            // 去除富文本标签后计算宽度
            var width = DialogUIManager.Instance.EstimateTextWidth(line.RemoveRichTextTags(), _contentText.fontSize);

            if (width > maxWidth)
            {
                _contentLayoutElement.preferredWidth = maxWidth;
            }
            else
            {
                _contentLayoutElement.preferredWidth = -1; // 自适应
            }

            _contentLayoutElement.minWidth = minWidth;

            LayoutRebuilder.ForceRebuildLayoutImmediate(_rectTransform);
        }

        private async void AfterAdvance()
        {
            _autoHideToken = new CancellationTokenSource();
            try
            {
                await Task.Delay(ConstRef.AutoHideDelay, _autoHideToken.Token);
                HideDialog();
            }
            catch (TaskCanceledException)
            {
                // 忽略取消
            }
        }

        public void HideDialog()
        {
            box.SetActive(false);
        }
        
        // ---------------------------- 生命周期 ----------------------------
        
        private void Awake()
        {
            box.SetActive(false);
            InitRefs();
        }

        private void InitRefs()
        {
            if (_isInitialized) return;

            _rectTransform = box.GetComponent<RectTransform>();
            _contentText = content.GetComponent<TMP_Text>();
            _contentLayoutElement = content.GetComponent<LayoutElement>();
            _isInitialized = true;
        }

        private void Start()
        {
            DialogUIManager.Instance.RegisterScreenView(DialogViewType.OnelineBox, this);
            RegisterEvents();
        }

        private void OnDestroy()
        {
            DialogUIManager.Instance.UnRegisterScreenView(DialogViewType.OnelineBox);
            UnregisterEvents();
            OnTextShowed = null;
        }

        private void RegisterEvents()
        {
            // 全局事件
            EnumEventSystem.Global.Register(DialogEventEnum.OptionShow, OnOptionShow);

            // 文本事件
            content.onTextShowed.AddListener(TextShowed);
        }

        private void UnregisterEvents()
        {
            // 全局事件
            EnumEventSystem.Global.UnRegister(DialogEventEnum.OptionShow, OnOptionShow);

            // 文本事件
            content.onTextShowed.RemoveListener(TextShowed);
        }

        private void TextShowed()
        {
            OnTextShowed?.Invoke();
            OnTextShowed = null;
        }

        private void OnOptionShow()
        {
            _autoHideToken?.Cancel();
            _autoHideToken = null;

            HideDialog();
        }
    }
}