//! \file       ImageG24.cs
//! \date       Mon Oct 12 16:14:47 2015
//! \brief      Ai5 engine RGB image.
//
// Copyright (C) 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 GameRes.Compression;
using System.ComponentModel.Composition;
using System.IO;
using System.Windows.Media;
using System.Windows.Media.Imaging;

namespace GameRes.Formats.Elf
{
    [Export(typeof(ImageFormat))]
    public class G24Format : ImageFormat
    {
        public override string         Tag { get { return "G24"; } }
        public override string Description { get { return "Ai5 engine RGB image format"; } }
        public override uint     Signature { get { return 0; } }

        public override ImageMetaData ReadMetaData (Stream stream)
        {
            using (var input = new ArcView.Reader (stream))
            {
                int x = input.ReadInt16();
                int y = input.ReadInt16();
                int w = input.ReadInt16();
                int h = input.ReadInt16();
                if (w <= 0 || w > 0x1000 || h <= 0 || h > 0x1000
                    || x < 0 || x > 0x800 || y < 0 || y > 0x800)
                    return null;
                return new ImageMetaData {
                    Width = (uint)w,
                    Height = (uint)h,
                    OffsetX = x,
                    OffsetY = y,
                    BPP = 24,
                };
            }
        }

        public override ImageData Read (Stream stream, ImageMetaData info)
        {
            stream.Position = 8;
            int stride = (((int)info.Width * 3 + 3) & -4);
            var pixels = new byte[stride * (int)info.Height];
            using (var reader = new LzssStream (stream, LzssMode.Decompress, true))
            {
                if (pixels.Length != reader.Read (pixels, 0, pixels.Length))
                    throw new InvalidFormatException();
                return ImageData.CreateFlipped (info, PixelFormats.Bgr24, null, pixels, stride);
            }
        }

        public override void Write (Stream file, ImageData image)
        {
            throw new System.NotImplementedException ("G24Format.Write not implemented");
        }
    }
}