using UnityEngine;

using System;
using System.Collections;

public class TweenAudio : TweenRoot 
{
    #region 变量

    public override bool InOrigin
    {
        get
        {
            if (Target.volume.Equal(Origin))
            {
                InOrigin_ = true;
            }
            else
            {
                InOrigin_ = false;
            }

            return InOrigin_;
        }
        set
        {
            InOrigin_ = value;

            InPause = false;
            InForward = false;
            InBackward = false;

            if (InOrigin_)
            {
                Target.volume = Origin;

                BackwardFinish();
            }
        }
    }

    public override bool InDestination
    {
        get
        {
            if (Target.volume.Equal(Destination))
            {
                InDestination_ = true;
            }
            else
            {
                InDestination_ = false;
            }

            return InDestination_;
        }
        set
        {
            InDestination_ = value;

            InPause = false;
            InForward = false;
            InBackward = false;

            if (InDestination_)
            {
                Target.volume = Destination;

                ForwardFinish();
            }
        }
    }

    public float Delta;
    public float Origin;
    public float Destination;
    public AudioSource Target;
    public CurveFunctionF Func;

    #endregion

    public TweenAudio(AudioSource target, float origin, float destination, float duration, bool originActive, bool destActive, Curve curve, bool cg = false) : base(cg, curve, target)
    {
        Func = AnimManager.CurveFuncDicF[curve];
        Target = target;

        InForward = false;
        InBackward = false;

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


    public override bool StartForward()
    {
        if (base.StartForward())
        {
            return true;
        }

        if (InBackward)
        {
            InBackward = false;

            Timer = AnimManager.GetTimerFloat(Target.volume, Duration, Origin, Delta, Curve);
        }

        return false;
    }

    public override bool StartBackward()
    {
        if (base.StartBackward())
        {
            return true;
        }

        if (InForward)
        {
            InForward = false;

            Timer = AnimManager.GetTimerFloat(Target.volume, Duration, Destination, -Delta, Curve);
        }

        return false;
    }

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

        if (Timer > Duration)
        {
            InDestination = true;

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

            SetLoop(EventType.ForwardFinish);

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

            return false;
        }
    }

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

        if (Timer > Duration)
        {
            InOrigin = true;

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

            SetLoop(EventType.BackwardFinish);

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

            return false;
        }
    }
}