using UnityEngine;

using System.Collections;

public class TweenRect : Tween 
{
    #region

    public override bool InOrigin
    {
        get
        {
            if (Target.sizeDelta == Origin)
            {
                _InOrigin = true;
            }
            else
            {
                _InOrigin = false;
            }

            return _InOrigin;
        }
        set
        {
            _InOrigin = value;

            if (_InOrigin)
            {
                Target.sizeDelta = Origin;

                FinishBackward();
            }
        }
    }

    public override bool InDestination
    {
        get
        {
            if (Target.sizeDelta == Destination)
            {
                _InDestination = true;
            }
            else
            {
                _InDestination = false;
            }

            return _InDestination;
        }
        set
        {
            _InDestination = value;

            if (_InDestination)
            {
                Target.sizeDelta = Destination;

                FinishForward();
            }
        }
    }

    protected Vector2 Delta;
    protected Vector2 Origin;
    protected Vector2 Destination;
    protected RectTransform Target;
    protected CurveFunctionV Func;

    #endregion

    public TweenRect(RectTransform target, Vector2 origin, Vector2 destination, float duration, bool originActive, bool destActive, Curve curve,bool cg=false) : base(cg,target)
    {
        CG = target.GetComponent<CanvasGroup>();
        Func = ManaAnim.CurveFuncDicV[curve];
        Target = target;

        InForward = false;
        InBackward = false;

        Delta = destination - origin;
        Origin = origin;
        Duration = duration;
        DestActive = destActive;
        Destination = destination;
        OriginActive = originActive;
    }

    public override void StartForward()
    {
        base.StartForward();

        if (InBackward)
        {
            Timer = Duration - Timer;
        }
        else
        {
            Target.sizeDelta = Origin;
        }
    }

    public override void StartBackward()
    {
        base.StartBackward();

        if (InForward)
        {
            Timer = Duration - Timer;
        }
        else
        {
            Target.sizeDelta = Destination;
        }
    }

    public override bool DoForward()
    {
        Timer += Time.fixedDeltaTime;

        if (Timer > Duration)
        {
            FinishForward();

            Timer = 0;

            InForward = false;
            InDestination = true;

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

            ManaAnim.TweenForList.Remove(this);

            return true;
        }
        else
        {
            Target.sizeDelta = Func(Timer, Duration, Origin, Delta);

            return false;
        }
    }

    public override bool DoBackward()
    {
        Timer += Time.fixedDeltaTime;

        if (Timer > Duration)
        {
            FinishBackward();

            Timer = 0;

            InBackward = false;
            InOrigin = true;

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

            ManaAnim.TweenBacList.Remove(this);

            return true;
        }
        else
        {
            Target.sizeDelta = Func(Timer, Duration, Destination, -Delta);

            return false;
        }
    }
}