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

namespace XANTools
{
    /// <summary>
    /// 自己重写的 Button 按钮
    /// 1、单击
    /// 2、双击
    /// 3、长按
    /// </summary>    
    public class MyButtonXAN : Selectable, IPointerClickHandler, ISubmitHandler
    {
        float timer = 0f;

        [Serializable]
        /// <summary>
        /// Function definition for a button click event.
        /// </summary>
        public class ButtonClickedEvent : UnityEvent { }

        // Event delegates triggered on click.
        [FormerlySerializedAs("onClick")]
        [SerializeField]
        private ButtonClickedEvent m_OnClick = new ButtonClickedEvent();

        protected MyButtonXAN()
        { }


        public ButtonClickedEvent onClick
        {
            get { return m_OnClick; }
            set { m_OnClick = value; }
        }

        private void Press()
        {
            if (!IsActive() || !IsInteractable())
                return;

            UISystemProfilerApi.AddMarker("Button.onClick", this);
            m_OnClick.Invoke();
        }


        [Serializable]
        /// <summary>
        /// Function definition for a button click event.
        /// </summary>
        public class ButtonLongPressEvent : UnityEvent { }

        [FormerlySerializedAs("onLongPress")]
        [SerializeField]
        private ButtonLongPressEvent m_onLongPress = new ButtonLongPressEvent();
        public ButtonLongPressEvent onLongPress
        {
            get { return m_onLongPress; }
            set { m_onLongPress = value; }
        }

        [FormerlySerializedAs("OnDoubleClick")]
        public ButtonClickedEvent m_onDoubleClick = new ButtonClickedEvent();
        public ButtonClickedEvent OnDoubleClick
        {
            get { return m_onDoubleClick; }
            set { m_onDoubleClick = value; }
        }

        private bool my_isStartPress = false;

        private float my_curPointDownTime = 0f;

        private float my_longPressTime = 0.25f;

        private bool my_longPressTrigger = false;


        void Update()
        {
            CheckIsLongPress();
        }

        void CheckIsLongPress()
        {

            if (my_isStartPress && !my_longPressTrigger)
            {
                timer += Time.deltaTime;

                if (Time.time > my_curPointDownTime + my_longPressTime&&timer>=0.1f)
                {
                    //my_longPressTrigger = true;
                    //my_isStartPress = false;
                   
                    if (m_onLongPress != null)
                    {
                        m_onLongPress.Invoke();
                        timer = 0f;
                    }
                }
            }
        }



        public virtual void OnPointerClick(PointerEventData eventData)
        {
            //(避免已經點擊進入長按后，擡起的情況)
            if (!my_longPressTrigger)
            {
                // 正常單擊 
                if (eventData.clickCount == 2)
                {

                    if (m_onDoubleClick != null)
                    {
                        m_onDoubleClick.Invoke();
                    }

                }// 雙擊
                else if (eventData.clickCount == 1)
                {
                    onClick.Invoke();
                }
            }
        }



        public virtual void OnSubmit(BaseEventData eventData)
        {
            Press();

            // if we get set disabled during the press
            // don't run the coroutine.
            if (!IsActive() || !IsInteractable())
                return;

            DoStateTransition(SelectionState.Pressed, false);
            StartCoroutine(OnFinishSubmit());
        }

        private IEnumerator OnFinishSubmit()
        {
            var fadeTime = colors.fadeDuration;
            var elapsedTime = 0f;

            while (elapsedTime < fadeTime)
            {
                elapsedTime += Time.unscaledDeltaTime;
                yield return null;
            }

            DoStateTransition(currentSelectionState, false);
        }

        public override void OnPointerDown(PointerEventData eventData)
        {
            // 按下刷新當前時間
            base.OnPointerDown(eventData);
            my_curPointDownTime = Time.time;
            my_isStartPress = true;
            my_longPressTrigger = false;
        }

        public override void OnPointerUp(PointerEventData eventData)
        {
            // 指針擡起，結束開始長按
            base.OnPointerUp(eventData);
            my_isStartPress = false;

        }

        public override void OnPointerExit(PointerEventData eventData)
        {
            // 指針移出，結束開始長按，計時長按標志
            base.OnPointerExit(eventData);
            my_isStartPress = false;

        }
    }
}