using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using AibisDream.Framework;
using AibisDream.Kit;
using AibisDream.Utility;
using Febucci.UI;
using TMPro;
using UnityEngine;
using UnityEngine.UI;

namespace AibisDream.FixSystem
{
    public class ScreenSystem : MonoBehaviour, IDialogView
    {
        #region 索引

        [SerializeField] private TMP_Text title;
        [SerializeField] private RectTransform textRoot;
        [SerializeField] private TMP_Text textForEstimation;
        private Action _nextStep;
        private GameObject _textItemPrefab;
        private Queue<TypewriterByCharacter> _lineQueue;

        public TaskScreen TaskScreen { get; private set; }

        public int maxLineNum = 10;

        #endregion

        private void Awake()
        {
            InitComponentRefs();
            Register();
        }

        private void InitComponentRefs()
        {
            TaskScreen = GetComponentInChildren<TaskScreen>();
            _lineQueue = new Queue<TypewriterByCharacter>();
            _textItemPrefab = ResourceKit.LoadAssetSync<GameObject>(ConstRef.ScreenTextName);
            // TODO 调整估算文本框的宽度
        }

        private void Register()
        {
            FixSystemCenter.SystemDic.Register(this);
            DialogCanvasManager.Instance.RegisterDialogView(DialogViewType.Screen, this);
            DialogCanvasManager.Instance.RegisterDialogView(DialogViewType.Task, TaskScreen);
        }

        private void OnDestroy()
        {
            FixSystemCenter.SystemDic.Unregister<ScreenSystem>();
            DialogCanvasManager.Instance.UnregisterDialogView(DialogViewType.Screen);
            DialogCanvasManager.Instance.UnregisterDialogView(DialogViewType.Task);
        }

        #region 基础功能

        private void ShowTitle(string targetTitle)
        {
            title.text = targetTitle;
        }

        public IEnumerator ShowText(string targetText)
        {
            EnumEventSystem.Global.Send(DialogEventEnum.LineShown);
            yield return new WaitForSeconds(0.5f);
            EnumEventSystem.Global.Send(DialogEventEnum.LineEnd);
            _nextStep.Invoke();
        }
        
        public void ClearTextScreen()
        {
            while (_lineQueue.Count > 0)
            {
                var text = _lineQueue.Dequeue();
                Destroy(text.gameObject);
            }
        }

        #endregion

        #region 对话框功能实现

        public void ShowLine(string dialogLine, CharacterVo character, Action nextStep, string lineId, bool isAutoSkip = false)
        {
            ShowTitle(character.GetActorName());
            // 生成新文本组件
            var textItem = Instantiate(_textItemPrefab, textRoot);
            var textItemTypewriter = textItem.GetComponent<TypewriterByCharacter>();
            // 估算文本高度
            var newLineNum = EstimateLineNum(dialogLine);
            var oldLineNum = CalcTotalLineNum();
            if (newLineNum + oldLineNum > maxLineNum)
            {
                Destroy(_lineQueue.Dequeue().gameObject);
            }
            _lineQueue.Enqueue(textItemTypewriter);
            
            // 播放文本
            textItemTypewriter.ShowText(dialogLine);
            // 播放完成后，顿0.3秒执行下一步
            textItemTypewriter.onTextShowed.AddListener(AutoNextStep);
            // 每行自动跳过
            _nextStep = nextStep;
            // 强制更新布局
            LayoutRebuilder.ForceRebuildLayoutImmediate(textRoot);
        }

        private void AutoNextStep()
        {
            
        }

        public void ShowOptions(DialogOption[] dialogueOptions)
        {
            Debug.Log("不能在显示屏显示对话");
        }

        public void HideDialog()
        {
            // HideDialog应该由其他函数控制
        }

        public bool TrySkipLine(bool isAutoSkip)
        {
            // 这里不能跳过对话
            return true;
        }

        public void NextStep()
        {
            // 这里不能手动跳到下一行
        }
        
        public void OnLocalizationChanged(string value)
        {
            // 屏幕不需要本地化
        }

        #endregion
        
        private int EstimateLineNum(string text)
        {
            textForEstimation.text = text;
            textForEstimation.ForceMeshUpdate();
            return textForEstimation.textInfo.linkCount;
        }

        private int CalcTotalLineNum()
        {
            return _lineQueue.Select(x => x.GetComponent<TMP_Text>().textInfo.linkCount).Sum();
        }
    }
}