//--------------------------------------------------------
//    [Author]:                   Wu Xijin
//    [Date]   :           Monday, October 10, 2016
//--------------------------------------------------------
using UnityEngine;
using System.Collections;
using UnityEngine.Events;
using UnityEngine.EventSystems;
using System;

public class RepeatedButton:MonoBehaviour, IPointerDownHandler, IPointerUpHandler {

    #region Fields

    bool m_IsMouseDown = false;
    public bool isMouseDown {
        get {
            return m_IsMouseDown;
        }
        private set {
            m_IsMouseDown = value;
        }
    }

    float nextTriggerTime = 0f;

    [SerializeField]
    float m_IntervalTime = 0.1f;
    public float intervalTime {
        get {
            return m_IntervalTime;
        }
        set {
            m_IntervalTime = Mathf.Clamp(value,0f,float.MaxValue);
        }
    }

    [SerializeField]
    UnityEvent m_OnClick = new UnityEvent();
    public UnityEvent onClick {
        get {
            return m_OnClick;
        }
    }

    #endregion

    public RepeatedButton AddListener(UnityAction _action) {
        onClick.AddListener(_action);
        return this;
    }

    public RepeatedButton RemoveListener(UnityAction _action) {
        onClick.RemoveListener(_action);
        return this;
    }

    public RepeatedButton RemoveAllListener() {
        onClick.RemoveAllListeners();
        return this;
    }

    #region Built-In
    void Awake() {

    }

    void Start() {

    }

    private void OnEnable() {
        isMouseDown = false;
    }

    private void OnDisable() {
        isMouseDown = false;
    }

    void LateUpdate() {
        if(isMouseDown) {
            if(Time.time > nextTriggerTime) {
                nextTriggerTime += intervalTime;
                if(onClick != null) {
                    onClick.Invoke();
                }
            }
        }
    }

    public void OnPointerDown(PointerEventData eventData) {
        if(eventData.button != PointerEventData.InputButton.Left) {
            return;
        }

        isMouseDown = true;
        nextTriggerTime = Time.time;
    }

    public void OnPointerUp(PointerEventData eventData) {
        if(eventData.button != PointerEventData.InputButton.Left) {
            return;
        }

        isMouseDown = false;
    }
    #endregion

}