//! \file       ImageKG.cs
//! \date       Mon Aug 17 01:50:50 2015
//! \brief      Interheart image format.
//
// 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 System;
using System.ComponentModel.Composition;
using System.IO;
using System.Windows.Media;
using GameRes.Utility;

namespace GameRes.Formats.Interheart
{
    [Export(typeof(ImageFormat))]
    public class KgFormat : ImageFormat
    {
        public override string         Tag { get { return "KG"; } }
        public override string Description { get { return "Interheart image format"; } }
        public override uint     Signature { get { return 0x4B474347; } } // 'GCGK'

        public override ImageMetaData ReadMetaData (IBinaryStream stream)
        {
            stream.Position = 4;
            uint width = stream.ReadUInt16();
            uint height = stream.ReadUInt16();
            int packed_size = stream.ReadInt32();
            if (packed_size <= 0)
                return null;
            return new ImageMetaData
            {
                Width = width,
                Height = height,
                BPP = 32,
            };
        }

        public override ImageData Read (IBinaryStream input, ImageMetaData info)
        {
            byte[] pixels = new byte[info.Width*info.Height*4];
            input.Position = 12;
            uint[] offset_table = new uint[info.Height];
            for (uint i = 0; i < info.Height; ++i)
                offset_table[i] = input.ReadUInt32();

            long base_offset = input.Position;
            int dst = 0;
            foreach (var offset in offset_table)
            {
                input.Position = base_offset + offset;
                for (int x = 0; x < info.Width; )
                {
                    byte alpha = input.ReadUInt8();
                    int count = input.ReadUInt8();
                    if (0 == count)
                        count = 0x100;
                    if (0 == alpha)
                    {
                        dst += count * 4;
                    }
                    else
                    {
                        for (int n = 0; n < count; ++n)
                        {
                            pixels[dst+3] = alpha;
                            pixels[dst+2] = input.ReadUInt8();
                            pixels[dst+1] = input.ReadUInt8();
                            pixels[dst]   = input.ReadUInt8();
                            dst += 4;
                        }
                    }
                    x += count;
                }
            }
            return ImageData.Create (info, PixelFormats.Bgra32, null, pixels);
        }

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