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

    public class LongPressButton : ButtonEx
    {
        public class ButtonPressEvent : UnityEvent { }

        [FormerlySerializedAs("onPress")]
        [SerializeField]
        private ButtonPressEvent m_OnPress = new ButtonPressEvent();
        public ButtonPressEvent onPress
        {
            get { return m_OnPress; }
            set { m_OnPress = value; }
        }

        [SerializeField]
        float m_LongPressCheckTime = 0.5f;
        public float longPressCheckTime
        {
            get { return m_LongPressCheckTime; }
            set { m_LongPressCheckTime = value; }
        }
        [SerializeField]
        float m_LongPressIntervalTime = 0.1f;
        public float longPressIntervalTime
        {
            get { return m_LongPressIntervalTime; }
            set { m_LongPressIntervalTime = value; }
        }

        float m_PressTime = 0.0f;
        float m_PressIntervalTime = 0.0f;
        bool m_LongPress = false;
        bool m_IsButtonDown = false;

        public override void OnPointerClick(PointerEventData eventData)
        {
            if (m_LongPress)
            {
                m_LongPress = false;
                return;
            }
            base.OnPointerClick(eventData);
        }

        public override void OnPointerDown(PointerEventData eventData)
        {
            base.OnPointerDown(eventData);
            m_PressTime = 0.0f;
            m_PressIntervalTime = 0.0f;
            m_IsButtonDown = true;
        }

        public override void OnPointerUp(PointerEventData eventData)
        {
            base.OnPointerUp(eventData);
            m_IsButtonDown = false;
        }

        public override void OnPointerExit(PointerEventData eventData)
        {
            base.OnPointerExit(eventData);
            m_IsButtonDown = false;
            m_LongPress = false;
        }

        private void Update()
        {
            if (m_IsButtonDown)
            {
                m_PressTime += Time.deltaTime;
                if (m_PressTime < m_LongPressCheckTime)
                {
                    return;
                }
                if (m_PressIntervalTime >= m_LongPressIntervalTime)
                {
                    onPress.Invoke();
                    m_PressIntervalTime = 0.0f;
                }
                m_PressIntervalTime += Time.deltaTime;
                m_LongPress = true;
            }
        }

        protected override void OnEnable()
        {
            base.OnEnable();
            m_LongPress = false;
            m_IsButtonDown = false;
        }
    }