using System;
using System.Collections.Generic;
using CriWare;
using Sirenix.Utilities;
using UnityEngine;
using UnityEngine.EventSystems;
using UnityEngine.InputSystem.UI;
using UnityEngine.UIElements;

public class ButtonEx: MonoBehaviour, IPointerUpHandler, IPointerDownHandler, IDragHandler, IBeginDragHandler, IEndDragHandler
{
    private bool _isPressed;
    private bool _isLastFramePressed;
    private float _pressedTime;
    private const float MinDelta = 0.0001f;
    private const float MinLongPressTime = 0.35f;
    private const float MinUpDelta = 1f;

    private List<PointerEventData> _pointerEventDatas = new();
    private PointerEventData _curPointerEventData;

    #region 继承滑动、按下抬起

    public delegate void BeginDrag(PointerEventData eventData);
    public delegate void OnDragging(PointerEventData eventData);
    public delegate void EndDrag(PointerEventData eventData);

    public delegate void OnPointUp(PointerEventData eventData);
    public delegate void OnPointDown(PointerEventData eventData);

    public BeginDrag beginDrag;
    public OnDragging onDragging;
    public EndDrag endDrag;
    public OnPointUp onPointUp;
    public OnPointDown onPointDown;

    public void OnPointerUp(PointerEventData eventData)
    {
        // if (eventData.pointerId >= 0)
        // {
        //     DebugUtil.LogError("OnPointerUp eventData.pointerId = " + eventData.pointerId);
        //     return;
        // }

        if (_pressedTime < MinLongPressTime)
        {
            if (_bOnClick)
            {
                onClick?.Invoke();
                _bOnClick = false;
            }
        }
        _curPointerEventData = null;
        _isPressed = false;
        _bLongPress = true;
        _bUpDrag = true;
        onPointUp?.Invoke(eventData);
    }

    public void OnPointerDown(PointerEventData eventData)
    {
        // if (eventData.pointerId >= 0)
        // {
        //     DebugUtil.LogError("OnPointerUp eventData.pointerId = " + eventData.pointerId);
        //     return;
        // }
        _curPointerEventData = eventData;
        _isPressed = true;
        _bLongPress = true;
        _bUpDrag = true;
        _startPos = eventData.pressPosition;
        onPointDown?.Invoke(eventData);
    }

    public void OnDrag(PointerEventData eventData)
    {
        if (eventData.pointerId < 0)
        {
            _curPointerEventData = eventData;
        }
        onDragging?.Invoke(eventData);
    }

    public void OnBeginDrag(PointerEventData eventData)
    {
        if (eventData.pointerId < 0)
        {
            _curPointerEventData = eventData;
        }
        beginDrag?.Invoke(eventData);
    }

    public void OnEndDrag(PointerEventData eventData)
    {
        if (eventData.pointerId < 0)
        {
            _curPointerEventData = eventData;
        }
        endDrag?.Invoke(eventData);
    }

    public void AddPointerUp(Action<PointerEventData> action)
    {
        onPointUp += (eventData) =>
        {
            action?.Invoke(eventData);
        };
    }
    
    public void AddPointerDown(Action<PointerEventData> action)
    {
        onPointDown += (eventData) =>
        {
            action?.Invoke(eventData);
        };
    }
    
    public void AddBeginDrag(Action<PointerEventData> action)
    {
        beginDrag += (eventData) =>
        {
            action?.Invoke(eventData);
        };
    }
    
    public void AddOnDrag(Action<PointerEventData> action)
    {
        onDragging += (eventData) =>
        {
            action?.Invoke(eventData);
        };
    }
    
    public void AddEndDrag(Action<PointerEventData> action)
    {
        endDrag += (eventData) =>
        {
            action?.Invoke(eventData);
        };
    }
    
#endregion

#region 扩展上滑、长按

    private bool _bUpDrag;
    private bool _bLongPress;
    private bool _bOnClick;
    public delegate void OnUpDrag();
    public delegate void OnLongPress();
    public delegate void OnClick();

    public OnUpDrag onUpDrag;
    public OnLongPress onLongPress;
    public OnClick onClick;

    private Vector2 _startPos;
    private Vector2 _curPos;

    public void AddLongPress(Action action)
    {
        onLongPress += () =>
        {
            action?.Invoke();
        };
    }
    
    public void AddUpDrag(Action action)
    {
        onUpDrag += () =>
        {
            action?.Invoke();
        };
    }
    
    public void AddUpDrag<T>(Action<T> action, T param)
    {
        onUpDrag += () =>
        {
            action?.Invoke(param);
        };
    }
#endregion

    private void Update()
    {
        if (!_isPressed)
        {
            _bOnClick = false;
            _isLastFramePressed = false;
            _pressedTime = 0f;
            return;
        }
        
        if (_isPressed)
        {
            _curPos = _curPointerEventData.position;
            //长按
            if (_bLongPress)
            {
                var disSqr = (_curPos - _startPos).sqrMagnitude;
                if (disSqr > MinDelta)
                {
                    _bLongPress = false;
                    _bOnClick = false;
                }
                else
                {
                    if (_pressedTime > MinLongPressTime)
                    {
                        onLongPress?.Invoke();
                        _bLongPress = false;
                    }
                }
            }
            
            //上滑
            if (_bUpDrag)
            {
                var disSqrY = Mathf.Sqrt(_curPos.y - _startPos.y);
                var disSqrX = Mathf.Sqrt(_curPos.x - _startPos.x);
                if (disSqrY > MinUpDelta && disSqrX < disSqrY / 2)
                {
                    onUpDrag?.Invoke();
                    _bUpDrag = false;
                }
            }

            _pressedTime += Time.deltaTime;
            if (!_isLastFramePressed)
            {
                _isLastFramePressed = true;
            }
            
        }
    }
    
    public void RemoveAll()
    {
        
    }

    private void OnDestroy()
    {
        
    }
}