using System;
using UnityEngine;
using UnityEngine.Gonbest.MagicCube;

/// <summary>
/// 组合纹理的相关数据类
/// </summary>
public class UISutureTextureData
{
    #region//私有变量
    //名字
    private string _name;
    private string _leftName;
    private string _rightName;

    //左边纹理
    private Texture2D _left;

    //右边纹理
    private Texture2D _right;

    //是否使用自定义加载
    private bool _useCustomLoad = false;

    //是否使用流文件
    private bool _isFromStreamFile = false;

    //扩展名
    private string _fileExt = ".png";

    //加载完成回调
    private Action<bool> _onLoadFinished;
    #endregion

    #region//属性定义
    //当前纹理数据是否有效
    public bool IsValid
    {
        get
        {
            return _left != null && _right != null;
        }
    }

    public Texture2D Left
    {
        get
        {
            return _left;
        }
        set
        {
            _left = value;
        }
    }

    public Texture2D Right
    {
        get
        {
            return _right;
        }
        set
        {
            _right = value;
        }
    }

    public string Name
    {
        get
        {
            return _name;
        }
    }

    public bool UseCustomLoad
    {
        get
        {
            return _useCustomLoad;
        }
    }

    public string LeftName
    {
        get
        {
            return _leftName;
        }
    }

    public string RightName
    {
        get
        {
            return _rightName;
        }
    }

    public bool IsFromStreamFile
    {
        get
        {
            return _isFromStreamFile;
        }

        set
        {
            _isFromStreamFile = value;
        }
    }

    public string FileExt
    {
        get
        {
            return _fileExt;
        }

        set
        {
            _fileExt = value;
        }
    }

    #endregion

    #region//构造函数
    public UISutureTextureData()
    {
        _useCustomLoad = false;
    }

    public UISutureTextureData(bool useCustomLoad)
    {
        _useCustomLoad = useCustomLoad;
    }

    public UISutureTextureData(string name, Texture2D left, Texture2D right)
    {
        _name = name;
        _leftName = _name + "_l";
        _rightName = _name + "_r";
        _left = left;
        _right = right;
    }

    #endregion

    #region//公共接口
    public void Load(string name, Action<bool> loadFinished)
    {
        if (_name != name)
        {
            //Debug.Log("UISutureTextureData:Load:" + name);
            UnLoad();
            _name = name;

            _leftName = _name + "_l";
            _rightName = _name + "_r";

            _onLoadFinished = loadFinished;
            if (!String.IsNullOrEmpty(_name))
            {
                if (!_useCustomLoad)
                {
                    if (_isFromStreamFile)
                    {
                        OnLoadFromStreamFile();
                    }
                    else
                    {
                        OnLoadFromResource();
                    }
                    OnLoadFinishedCallBack(true);
                }
                else
                {
                    OnCustomLoadImp();
                }
            }
        }
    }

    public void UnLoad()
    {


        if (!String.IsNullOrEmpty(_name))
        {
            if (!_useCustomLoad)
            {
#if !UNITY_EDITOR
                if (_left != null)
                {
                    GameObject.Destroy(_left);
                    Resources.UnloadAsset(_left);
                }
                if (_right != null)
                {
                    GameObject.Destroy(_right);
                    Resources.UnloadAsset(_right);
                }
#endif
            }
            else
            {
                OnCustomUnLoadImp();
            }

            _left = null;
            _right = null;
            _name = null;
            _leftName = null;
            _rightName = null;
            _onLoadFinished = null;
        }
    }

    private void OnLoadFromResource()
    {
        _left = Resources.Load<Texture2D>(_leftName);
        _right = Resources.Load<Texture2D>(_rightName);
    }
    private void OnLoadFromStreamFile()
    {
        try
        {
           
            AppManager.Instance.ReadBytesAsync(_leftName + _fileExt, bytes => {

                Debug.Log("OnLoadFromStreamFile:" + _leftName + _fileExt + " Is Exist: " + (bytes != null).ToString());
                if (bytes != null)
                {
                    _left = new Texture2D(256, 256, TextureFormat.RGBA32, false);
                    _left.LoadImage(bytes);
                    _left.wrapMode = TextureWrapMode.Clamp;
                    _left.filterMode = FilterMode.Bilinear;
                }
            });
           
            AppManager.Instance.ReadBytesAsync(_rightName + _fileExt, bytes => {
                Debug.Log("OnLoadFromStreamFile:" + _rightName + _fileExt + " Is Exist:" + (bytes != null).ToString());
                if (bytes != null)
                {
                    _right = new Texture2D(256, 256, TextureFormat.RGBA32, false);
                    _right.LoadImage(bytes);
                    _right.wrapMode = TextureWrapMode.Clamp;
                    _right.filterMode = FilterMode.Bilinear;
                }
            });
           
           
        }
        catch(Exception ex)
        {
            Debug.LogError("读取图片文件失败!" + _leftName + "::" + _rightName);
            Debug.LogException(ex);
        }
    }
    #endregion

    #region//子类继承处理 和调用
    protected virtual void OnCustomLoadImp()
    {

    }

    protected virtual void OnCustomUnLoadImp()
    {

    }

    protected void OnLoadFinishedCallBack(bool loaded)
    {
        if (_onLoadFinished != null) _onLoadFinished(loaded);
    }
    #endregion

}