using System;
using System.Drawing;
using System.Drawing.Imaging;
using System.IO;
using System.Runtime.InteropServices;
using UnityEngine;

public class TextureData
{    
    public static int lastId = 0;
    public string type { get { return _type; } }
    public int id { get { return _id; } }
    public Texture2D texture { get { return _tex; } }
    public string filePath { get { return _filePath; } }
    //private bool _is_decoded = false;
    public TextureData(string filePath)
    {
        _id = lastId;
        _filePath = filePath;
        //string tmp = "YYYY-MM-DD-hh-mm-ss-fff-";
        //int b = _filePath.LastIndexOf("\\")+tmp.Length;
        int e = _filePath.LastIndexOf(".");
        int b = _filePath.LastIndexOf("+",e);
        if (b != -1 && e != -1 && b < e)
            _type = _filePath.Substring(b + 1, e - b - 1);
    }
    public override bool Equals(object obj)
    {
        if (obj == null || !(obj is TextureData))
            return false;
        else
            return this.id == ((TextureData)obj).id;
    }

    public override int GetHashCode()
    {
        return this.id;
    }
    public override string ToString()
    {
        return _type+": "+_filePath;
    }

    public bool loadToMemory(int maxSize = 0)
    {
        try
        {
#if false
            FileStream fs = File.Open(_filePath, FileMode.Open);
            System.Drawing.Image img = System.Drawing.Image.FromStream(fs);
            fs.Close();
#else
            using (System.Drawing.Image img = System.Drawing.Image.FromFile(_filePath))
#endif
            {
                if (maxSize == 0)
                    maxSize = Math.Max(img.Width, img.Height);
                //Bitmap resizedBitmap = new Bitmap(img);// ImageUtil.ResizeImage(img, maxSize);
                Bitmap resizedBitmap = ImageUtil.ResizeImage(img, maxSize);
                _width = resizedBitmap.Width;
                _height = resizedBitmap.Height;

                _rawdata = createRawbytes(resizedBitmap);
                //_is_decoded = true;

            }
            return true;
        }
        catch (System.Exception err)
        {
            Debug.Log(err.StackTrace);
            return false;
        }
    }
#if false
    private static ImageCodecInfo GetEncoderInfo(String mimeType)
    {
        int j;
        ImageCodecInfo[] encoders;
        encoders = ImageCodecInfo.GetImageEncoders();
        for (j = 0; j < encoders.Length; ++j)
        {
            if (encoders[j].MimeType == mimeType)
                return encoders[j];
        }
        return null;
    }

    public bool encode()
    {
        if(_rawdata == null)
        {
            return false;
        }
        Bitmap bitmap = new Bitmap(_width,_height, PixelFormat.Format32bppArgb);
        BitmapData bitmapData = bitmap.LockBits(new Rectangle(0, 0, _width, _height), ImageLockMode.ReadOnly, PixelFormat.Format32bppArgb);
        int length = bitmapData.Stride * bitmapData.Height;
        Marshal.Copy(_rawdata,0, bitmapData.Scan0,length);
        bitmap.UnlockBits(bitmapData);

        MemoryStream ms = new MemoryStream();
        
        ImageCodecInfo myImageCodecInfo = GetEncoderInfo("image/png");

        EncoderParameters myEncoderParameters = new EncoderParameters(1);

        // Save the bitmap as a JPEG file with quality level 25.
        EncoderParameter myEncoderParameter = new EncoderParameter(Encoder.Quality, 90);
        myEncoderParameters.Param[0] = myEncoderParameter;


        bitmap.Save(ms, myImageCodecInfo, myEncoderParameters);


        _compacted_data = ms.ToArray();
        _rawdata = null;
        _is_decoded = false;  

        return true;
    }
    public bool decode()
    {
        if (_compacted_data == null)
        {
            return false;
        }
        MemoryStream ms = new MemoryStream();
        ms.Write(_compacted_data, 0, _compacted_data.Length);
        Bitmap bitmap = new Bitmap(ms);

        _rawdata =  createRawbytes(bitmap);
        _compacted_data = null;
        _is_decoded = true;
        
        return true;
    }
#endif
    private byte[] createRawbytes(Bitmap bitmap)
    {
        BitmapData bitmapData = bitmap.LockBits(new Rectangle(0, 0, _width, _height), ImageLockMode.ReadOnly, PixelFormat.Format32bppArgb);
        int length = bitmapData.Stride * bitmapData.Height;
        byte[] result = new byte[length];
        Marshal.Copy(bitmapData.Scan0, result, 0, length);
        bitmap.UnlockBits(bitmapData);

        return result;
    }
    public bool createTextureFromMemory()
    {
        destroyTexture();
        _tex = new Texture2D(_width, _height, TextureFormat.BGRA32, false);        
        _tex.LoadRawTextureData(_rawdata);
        _tex.Compress(false);
        _rawdata = null;
        _tex.Apply();

        return true;
    }
    public void destroyTexture()
    {
        //if(_tex!=null)
        //    UnityEngine.Object.Destroy(_tex);
        _tex = null;
    }
    /*
    public bool isDecoded()
    {
        return _is_decoded;
    }
    */
    ////////////////////////////////////////////////////////////////////////////////
    private int _id=0;
    private string _filePath = "";
    private string _type="";
    private byte[] _rawdata;
    //private byte[] _compacted_data;
    private Texture2D _tex;
    private int _width;
    private int _height;

    
}