using UnityEngine;
using UnityEngine.Events;

using System;
using System.Collections;

public abstract class Tween 
{
    public virtual bool InOrigin
    {
        get { return _InOrigin; }
        set { _InOrigin = value; }
    }

    public virtual bool InDestination
    {
        get { return _InDestination; }
        set { _InDestination = value; }
    }

    protected bool _InOrigin;
    protected bool _InDestination;

    public bool InForward;
    public bool InBackward;
    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 (InOrigin)
        {
            StartForward();
        }
    }

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


    public virtual void StartForward()
    {
        InForward = true;

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

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

    public virtual void StartBackward()
    {
        InBackward = true;

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

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


    public void PushEvent(EventType type, UnityAction action)
    {
        if (type == EventType.ForwardStart)
        {
            OnForwardStart = action + OnForwardStart;
        }
        else if (type == EventType.ForwardFinish)
        {
            OnForwardFinish = action + OnForwardFinish;
        }
        else if (type == EventType.BackwardStart)
        {
            OnBackwardStart = action + OnBackwardStart;
        }
        else if (type == EventType.BackwardFinish)
        {
            OnBackwardFinish = action + OnBackwardFinish;
        }
    }

    public void AddEventOnetime(EventType type, UnityAction action)
    {
        if (type == EventType.ForwardStart)
        {
            action += () =>
            {
                OnForwardStart -= action;
            };

            OnForwardStart += action;
        }
        else if (type == EventType.ForwardFinish)
        {
            action += () =>
            {
                OnForwardFinish -= action;
            };

            OnForwardFinish += action;
        }
        else if (type == EventType.BackwardStart)
        {
            action += () =>
            {
                OnBackwardStart -= action;
            };

            OnBackwardStart += action;
        }
        else if (type == EventType.BackwardFinish)
        {
            action += () =>
            {
                OnBackwardFinish -= action;
            };

            OnBackwardFinish += action;
        }
    }
}