using UnityEngine;
using UnityEngine.Events;

using System;
using System.Collections;

public abstract class Tween 
{
    public bool InForward;
    public bool InBackward;

    public bool IsForward;
    public bool IsBackward;
    public UnityAction OnForwardStart;
    public UnityAction OnForwardFinish;
    public UnityAction OnBackwardStart;
    public UnityAction OnBackwardFinish;

    public float Duration;

    protected float Timer;
    protected bool DestActive;
    protected bool OriginActive;

    public abstract bool DoForward();
    public abstract bool DoBackward();


    public void ConfineForward()
    {
        if (InForward)
        {
            StartForward();
        }
    }

    public void ConfineBackward()
    {
        if (InBackward)
        {
            StartBackward();
        }
    }


    public virtual void StartForward()
    {
        IsForward = true;
        InForward = false;

        OnForwardStart.Invoke();

        ManaAnim.TweenForList.Add(this);
        ManaAnim.TweenBacList.Remove(this);
    }

    public virtual void StartBackward()
    {
        IsBackward = true;
        InBackward = false;

        OnBackwardStart.Invoke();

        ManaAnim.TweenForList.Remove(this);
        ManaAnim.TweenBacList.Add(this);
    }
}