using System;
using System.Collections;
using AibisDream.Framework;
using AibisDream.Kit;
using DG.Tweening;
using TMPro;
using UnityEngine;

namespace AibisDream.FixSystem
{
    public class ScreenSystem : MonoBehaviour, IScreen, IDialogView
    {
        private static readonly int DirectionalAlphaFadeFade = Shader.PropertyToID("_DirectionalAlphaFadeFade");

        #region 效果参数

        public float rotateDuration = 0.5f;
        public float typeSpeed = 0.05f;
        public int maxTextLine;

        #endregion

        #region 索引

        private Transform _textScreen;
        [SerializeField] private TMP_Text title;
        [SerializeField] private TMP_Text text;
        [SerializeField] private SpriteRenderer screenImage;
        private Material _imageMaterial;
        private Action _nextStep;

        private TextGenerator _generator;
        private TextGenerationSettings _generationSettings;

        private IUnRegister _plugOutRmv;

        #endregion

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

        private void InitComponentRefs()
        {
            _textScreen = transform.Find("旋转屏幕");
            _imageMaterial = screenImage.material;

            _generator = new TextGenerator();
            _generationSettings = new TextGenerationSettings
            {
                font = text.font.sourceFontFile,
                fontSize = Mathf.RoundToInt(text.fontSize),
                lineSpacing = text.lineSpacing,
                horizontalOverflow = HorizontalWrapMode.Wrap,
                verticalOverflow = VerticalWrapMode.Truncate,
                generationExtents = new Vector2(text.rectTransform.rect.width, Mathf.Infinity),
                resizeTextForBestFit = false
            };
        }

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

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

        #region 基础功能

        public void OpenTextScreen()
        {
            // 旋转
            _textScreen.DORotate(new Vector3(0, 0, 0), rotateDuration);
        }

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

        public IEnumerator ShowText(string targetText)
        {
            // 先换行
            if (!string.IsNullOrEmpty(text.text))
            {
                text.text += "\n";
            }
            // 先估算新增行数
            var targetLineNum = EstimateLineNum(targetText);
            // 截断超出屏幕的部分
            var oldText = "";
            if (targetLineNum + text.textInfo.lineCount > maxTextLine)
            {
                var cutLineNum = targetLineNum + text.textInfo.lineCount - maxTextLine;
                if (cutLineNum <= text.textInfo.lineCount)
                {
                    var lastCharIndex = text.textInfo.lineInfo[cutLineNum - 1].lastCharacterIndex;
                    if (lastCharIndex + 1 < text.text.Length)
                    {
                        oldText = text.text.Substring(lastCharIndex + 1);
                    }
                    else
                    {
                        oldText = string.Empty;
                    }
                }
            }
            else
            {
                oldText = text.text;
            }


            var targetLength = oldText.Length + targetText.Length;

            // 逐个字符添加
            yield return DOTween.To(() => oldText.Length, x => UpdateText(x, targetText, oldText), targetLength,
                targetText.Length * typeSpeed).WaitForCompletion();
            EnumEventSystem.Global.Send(DialogEventEnum.LineShown);
            yield return new WaitForSeconds(0.5f);
            EnumEventSystem.Global.Send(DialogEventEnum.LineEnd);
            _nextStep.Invoke();
        }

        private int EstimateLineNum(string str)
        {
            var height = _generator.GetPreferredHeight(str, _generationSettings);
            var lineHeight = text.fontSize * 1.2f; // 简单估算行高

            return Mathf.CeilToInt(height / lineHeight);
        }

        private void UpdateText(int currentLength, string nextText, string oldText)
        {
            var appendLength = currentLength - oldText.Length;
            text.text = oldText + nextText[..appendLength];
        }

        public Tween ShowImage(Sprite sprite)
        {
            // 先回归隐藏状态
            _imageMaterial.SetFloat(DirectionalAlphaFadeFade, 0);
            // 切换图片
            screenImage.sprite = sprite;
            // 逐渐展示
            return DOTween.To(() => _imageMaterial.GetFloat(DirectionalAlphaFadeFade),
                value => _imageMaterial.SetFloat(DirectionalAlphaFadeFade, value), 10f, 0.5f);
        }

        public void ClearImage()
        {
            _imageMaterial.SetFloat(DirectionalAlphaFadeFade, 0);
            screenImage.sprite = null;
        }

        public void ClearTextScreen()
        {
            title.text = "";
            text.SetText("");
        }

        public void CloseTextScreen()
        {
            // 先清除文字
            ClearTextScreen();
            // 旋转隐藏
            if (transform.eulerAngles.z >= -80f)
            {
                _textScreen.DORotate(new Vector3(0, 0, -90), rotateDuration, RotateMode.FastBeyond360);
            }
        }

        #endregion

        #region 状态切换

        /// <summary>
        /// 插头链接时播放内容
        /// </summary>
        /// <param name="sprite">需要播放的图片</param>
        /// <returns></returns>
        public IEnumerator OnLink(Sprite sprite)
        {
            EnumEventSystem.Global.Send(EventEnum.OpenScreen);
            // 右侧加载图片
            var tween = ShowImage(sprite);
            yield return tween.WaitForCompletion();

            // 左侧打开副屏
            OpenTextScreen();
            yield return new WaitForSeconds(rotateDuration + 0.2f);
        }

        /// <summary>
        /// 收回屏幕时触发
        /// </summary>
        /// <returns></returns>
        public IEnumerator OnUnlink()
        {
            // 隐藏图片
            ClearImage();
            yield return new WaitForSeconds(0.3f);
            // 左侧回收屏幕
            CloseTextScreen();
            yield return new WaitForSeconds(rotateDuration + 0.2f);

            EnumEventSystem.Global.Send(EventEnum.CloseScreen);
        }

        #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());
            StartCoroutine(ShowText(dialogLine));
            // 每行自动跳过
            _nextStep = nextStep;
        }

        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
        }

        #endregion
    }

    /// <summary>
    /// 屏幕接口
    /// </summary>
    public interface IScreen
    {
        // 打开副屏
        void OpenTextScreen();

        // 显示标题文字
        void ShowTitle(string title);

        // 显示正文
        IEnumerator ShowText(string text);

        // 显示图片
        Tween ShowImage(Sprite sprite);

        // 清除图片
        void ClearImage();

        // 清空屏幕
        void ClearTextScreen();

        // 关闭副屏
        void CloseTextScreen();
    }
}