//! \file       ImageGRP.cs
//! \date       Wed Aug 19 20:58:51 2015
//! \brief      Muv-Luv Amaterasu Translation RGB bitmap.
//
// Copyright (C) 2014-2015 by morkt
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to
// deal in the Software without restriction, including without limitation the
// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
// sell copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
// IN THE SOFTWARE.
//

using System.IO;
using System.Text;
using System.ComponentModel.Composition;
using System.Windows;
using System.Windows.Media;
using System.Windows.Media.Imaging;

namespace GameRes.Formats.Amaterasu
{
    [Export(typeof(ImageFormat))]
    public class GrpFormat : ImageFormat
    {
        public override string Tag { get { return "GRP"; } }
        public override string Description { get { return Strings.arcStrings.GRPDescription; } }
        public override uint Signature { get { return 0x00505247; } }

        public override ImageMetaData ReadMetaData (Stream stream)
        {
            using (var file = new BinaryReader (stream, Encoding.ASCII, true))
            {
                if (file.ReadUInt32() != Signature)
                    return null;
                var meta = new ImageMetaData();
                meta.OffsetX = file.ReadInt16();
                meta.OffsetY = file.ReadInt16();
                meta.Width   = file.ReadUInt16();
                meta.Height  = file.ReadUInt16();
                meta.BPP     = 32;
                return meta;
            }
        }

        public override ImageData Read (Stream file, ImageMetaData info)
        {
            int width = (int)info.Width;
            int height = (int)info.Height;
            int stride = width*4;
            byte[] pixels = new byte[stride*height];
            file.Position = 12;
            for (int row = height-1; row >= 0; --row)
            {
                if (stride != file.Read (pixels, row*stride, stride))
                    throw new InvalidFormatException();
            }
            return ImageData.Create (info, PixelFormats.Bgra32, null, pixels);
        }

        public override void Write (Stream stream, ImageData image)
        {
            using (var file = new BinaryWriter (stream, Encoding.ASCII, true))
            {
                file.Write (Signature);
                file.Write ((short)image.OffsetX);
                file.Write ((short)image.OffsetY);
                file.Write ((ushort)image.Width);
                file.Write ((ushort)image.Height);

                var bitmap = image.Bitmap;
                if (bitmap.Format != PixelFormats.Bgra32)
                {
                    bitmap = new FormatConvertedBitmap (image.Bitmap, PixelFormats.Bgra32, null, 0);
                }
                int stride = (int)image.Width * 4;
                byte[] row_data = new byte[stride];
                Int32Rect rect = new Int32Rect (0, (int)image.Height, (int)image.Width, 1);
                for (uint row = 0; row < image.Height; ++row)
                {
                    --rect.Y;
                    bitmap.CopyPixels (rect, row_data, stride, 0);
                    file.Write (row_data);
                }
            }
        }
    }
}
