using UnityEngine;
using System.Collections;
using System.Collections.Generic;
using UnityEngine.UI;
using System;

[RequireComponent(typeof(Image))]
public class UGUISpriteAnimation : MonoBehaviour
{
    private Image ImageSource;
    private int mCurFrame = 0;
    private float mDelta = 0;

    public float FPS = 16;
    //public List<Sprite> SpriteFrames;
    public bool IsPlaying = false;
    public bool Foward = true;
    public bool AutoPlay = true;
    public bool Loop = false;

    public Action OnAnimationEndEvent;


    private string _containerName;

    public int FrameCount
    {
        get
        {
            return SpriteFrames.Count;
        }
    }

    /// <summary>
    /// 资源
    /// </summary>
    private Dictionary<string, Sprite> SpriteFrames = new Dictionary<string, Sprite>();

    /// <summary>
    /// 
    /// </summary>
    /// <param name="frameContainer"></param>
    /// <param name="frameCount"></param>
    public void Init(string frameContainer, Action onInitFinished)
    {
        _containerName = frameContainer;

        ImageSource = GetComponent<Image>();

        ResourceHelper.Instance.LoadAssetBundle(frameContainer, (AssetBundle bundle) =>
       {
           if (null != bundle)
           {
               GameObject go = (GameObject)bundle.LoadAsset(frameContainer);
               List<Sprite> tempList = go.GetComponent<IconContainer>().mSpriteList;
               for (int i = 0; i < tempList.Count; i++)
               {
                   if (null != tempList[i])
                   {
                       SpriteFrames[tempList[i].name] = tempList[i];
                   }
               }
               //SpriteFrames = go.GetComponent<IconContainer>().mSpriteList; 
           } 
           if (onInitFinished != null)
           {
               onInitFinished();
           }
       });
    }

    public void StartPlayAnimation()
    {
        if (AutoPlay)
        {
            Play();
        }
        else
        {
            IsPlaying = false;
        }
    }

    private void SetSprite(int idx)
    {  
        string resname = "frame (" + (idx + 1) + ")";
        ImageSource.sprite = SpriteFrames[resname];
        ImageSource.SetNativeSize();
       
        //IconManager.Instance.GetSprite(_containerName, resname, texture =>
        //{
        //    ImageSource.overrideSprite = texture;   
        //    ImageSource.SetNativeSize();
        //});
    }

    public void Play()
    {
        IsPlaying = true;
        Foward = true;
    }

    public void PlayReverse()
    {
        IsPlaying = true;
        Foward = false;
    }

    void Update()
    {
        if (!IsPlaying || 0 == FrameCount)
        {
            return;
        }

        mDelta += Time.deltaTime;
        if (mDelta > 1 / FPS)
        {
            mDelta = 0;
            if (Foward)
            {
                mCurFrame++;
            }
            else
            {
                mCurFrame--;
            }

            if (mCurFrame >= FrameCount)
            {
                InvokeEndEvent();
                if (Loop)
                {
                    mCurFrame = 0;
                }
                else
                {
                    IsPlaying = false;
                    return;
                }
            }
            else if (mCurFrame < 0)
            {
               InvokeEndEvent();
                if (Loop)
                {
                    mCurFrame = FrameCount - 1;
                }
                else
                {
                    IsPlaying = false;
                    return;
                }
            }

            SetSprite(mCurFrame);
        }
    }

    private void InvokeEndEvent()
    {
        if (OnAnimationEndEvent != null)
        {
            OnAnimationEndEvent();
        }
    }

    public void Pause()
    {
        IsPlaying = false;
    }

    public void Resume()
    {
        if (!IsPlaying)
        {
            IsPlaying = true;
        }
    }

    public void Stop()
    {
        mCurFrame = 0;
        SetSprite(mCurFrame);
        IsPlaying = false;
    }

    public void Rewind()
    {
        mCurFrame = 0;
        SetSprite(mCurFrame);
        Play();
    }
}