//! \file       ImageCMP.cs
//! \date       2018 Jul 26
//! \brief      Ark image format.
//
// Copyright (C) 2018 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.ComponentModel.Composition;
using System.IO;
using System.Windows.Media;

// [030328][Ark] Tsuki no Mori

namespace GameRes.Formats.Ark
{
    internal class CmpMetaData : ImageMetaData
    {
        public bool     HasAlpha;
        public uint     AWidth;
        public uint     AHeight;
        public uint[]   FreqTable;
        public int      DataOffset;
    }

    [Export(typeof(ImageFormat))]
    public class CmpFormat : ImageFormat
    {
        public override string         Tag { get { return "CMP/ARK"; } }
        public override string Description { get { return "Ark image format"; } }
        public override uint     Signature { get { return 0; } }

        public override ImageMetaData ReadMetaData (IBinaryStream file)
        {
            if (!file.Name.HasExtension (".cmp"))
                return null;
            var header = file.ReadHeader (5);
            uint width  = header.ToUInt16 (0);
            uint height = header.ToUInt16 (2);
            bool has_alpha = header[4];
            int aw = 0, ah = 0;
            if (has_alpha)
            {
                aw = file.ReadUInt16();
                ah = file.ReadUInt16();
            }
            var table = new uint[32];
            for (int i = 0; i < 32; ++i)
                table[i] = file.ReadUInt32();
            int packed_length = file.ReadInt32();
            long data_pos = file.Position;
            if (file.Length - data_pos != packed_length)
                return null;
            return new CmpMetaData {
                Width = width,
                Height = height,
                BPP = 32,
                HasAlpha = has_alpha,
                AWidth = aw,
                AHeight = ah,
                FreqTable = table,
                DataOffset = (int)data_pos,
            };
        }

        public override ImageData Read (IBinaryStream file, ImageMetaData info)
        {
            var reader = new CmpReader (file, (CmpMetaData)info);
            var pixels = reader.Unpack();
            return ImageData.Create (info, reader.Format, null, pixels);
        }

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

    internal class CmpReader
    {
        IBinaryStream   m_input;
        CmpMetaData     m_info;

        public PixelFormat Format { get; private set; }

        public CmpReader (IBinaryStream input, CmpMetaData info)
        {
            m_input = input;
            m_info = info;
        }

        public byte[] Unpack ()
        {
            m_input.Position = m_info.DataOffset;
        }
    }
}