using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.EventSystems;
using UnityEngine.UI;

namespace BF
{
    public class CellDragEvent : UITouchEvent, IBeginDragHandler, IDragHandler, IEndDragHandler
    {
        private ScrollRect scrollRect;
        [Tooltip("设置值为Drag**")]
        public UITouchEventType slideType = UITouchEventType.Unknown;
    
        private Vector2 touchStart = Vector2.zero;
        private Vector2 touchOffest = Vector2.zero;
        private bool isTriggerSlideEvent = false;
        private UITouchEventType bindSlideType;
        
        public void AddTouchEventListener(Action<int, float, float> func, int slideType)
        {
            luaFunc = func;
            bindSlideType = (UITouchEventType) slideType;
        }
        
        public void OnBeginDrag(PointerEventData eventData)
        {
            if (!enable)
            {
                return;
            }
            touchStart = eventData.position;
            scrollRect.OnBeginDrag(eventData);
        }

        public void OnDrag(PointerEventData eventData)
        {
            if (!enable)
            {
                return;
            }

            if (!isTriggerSlideEvent)
            {
                touchOffest = eventData.position - touchStart;
                if (IsTargetDrection(touchOffest))
                {
                    if (slideType == bindSlideType)
                    {
                        scrollRect.StopMovement();
                        luaFunc((int) slideType, eventData.position.x, eventData.position.y);
                        isTriggerSlideEvent = true;
                    }
                    else
                    {
                        luaFunc((int)UITouchEventType.Drag, eventData.position.x, eventData.position.y);
                        scrollRect.OnDrag(eventData);
                    }
                }
            }
        }

        public void OnEndDrag(PointerEventData eventData)
        {
            if (!enable)
            {
                return;
            }

            isTriggerSlideEvent = false;
            scrollRect.OnEndDrag(eventData);
        }
        public bool IsTargetDrection(Vector2 offset)
        {

            var offsetAbsX = Mathf.Abs(offset.x);
            var offsetAbsY = Mathf.Abs(offset.y);

            if (offsetAbsX > EventSystem.current.pixelDragThreshold || offsetAbsY > EventSystem.current.pixelDragThreshold)
            {
                if (offsetAbsX > offsetAbsY)
                {
                    if (offset.x > 0)
                    {
                        slideType = UITouchEventType.DragRight;
                    }
                    else
                    {
                        slideType = UITouchEventType.DragLeft;
                    }
                }
                else
                {
                    if (offset.y > 0)
                    {
                        slideType = UITouchEventType.DragUp;
                    }
                    else
                    {
                        slideType = UITouchEventType.DragDown;
                    }
                }

                return true;
            }

            return false;
        }

        public void SetSrollRect(ScrollRect scroll)
        {
            scrollRect = scroll;
        }
    }

}