using UnityEngine;

using System.Collections;

public class TweenRect : Tween 
{
    #region

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

    #endregion

    public TweenRect(RectTransform target, Vector2 origin, Vector2 destination, float duration, bool originActive, bool destActive, Curve curve)
    {
        if (target.sizeDelta == origin)
        {
            InForward = true;
        }
        else if (target.sizeDelta == destination)
        {
            InBackward = true;
        }

        CG = target.GetComponent<CanvasGroup>();
        Func = ManaAnim.FunctionDicV[curve];
        Target = target;

        IsForward = false;
        IsBackward = false;

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

        OnForwardStart += () =>
        {
            Target.SetActive(true);

            if (CG != null)
            {
                CG.interactable = false;
            }
        };

        OnForwardFinish += () =>
        {
            Target.SetActive(DestActive);

            if (CG != null)
            {
                CG.interactable = DestActive;
            }
        };

        OnBackwardStart += () =>
        {
            Target.SetActive(true);

            if (CG != null)
            {
                CG.interactable = false;
            }
        };

        OnBackwardFinish += () =>
        {
            Target.SetActive(OriginActive);

            if (CG != null)
            {
                CG.interactable = OriginActive;
            }
        };
    }

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

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

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

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

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

        if (Timer > Duration)
        {
            Timer = 0;

            Target.sizeDelta = Destination;

            IsForward = false;
            InBackward = true;

            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)
        {
            Timer = 0;

            Target.sizeDelta = Origin;

            IsBackward = false;
            InForward = true;

            OnBackwardFinish.Invoke();

            ManaAnim.TweenBacList.Remove(this);

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

            return false;
        }
    }
}