using UnityEngine;
using UnityEngine.UI;

using System;
using System.Collections;
using System.Collections.Generic;

public class TweenNumber : TweenRoot
{
    #region 变量

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

            return InOrigin_;
        }
        set
        {
            InOrigin_ = value;

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

            if (InOrigin_)
            {
                Target.text = Origin.ToString();

                BackwardFinish();
            }
        }
    }

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

            return InDestination_;
        }
        set
        {
            InDestination_ = value;

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

            if (InDestination_)
            {
                Target.text = Destination.ToString();

                ForwardFinish();
            }
        }
    }

    public int Delta;
    public int Origin;
    public int Destination;

    public Text Target;
    public CurveFunctionF Func;

    #endregion

    public TweenNumber(Text target, int origin, int 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;

        DestActive = destActive;
        Destination = destination;
        OriginActive = originActive;
    }

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

        if (InBackward)
        {
            InBackward = false;

            Timer = AnimManager.GetTimerFloat(int.Parse(Target.text), Duration, Origin, Delta, Curve);
        }

        return false;
    }

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

        if (InForward)
        {
            InForward = false;

            Timer = AnimManager.GetTimerFloat(int.Parse(Target.text), 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.text = ((int) Func(Timer, Duration, Origin, Delta)).ToString();

            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.text = ((int) Func(Timer, Duration, Destination, -Delta)).ToString();

            return false;
        }
    }
}