//! \file       ImageAPS.cs
//! \date       Sun Dec 06 15:11:38 2015
//! \brief      Kaguya tiled image format.
//
// Copyright (C) 2015-2016 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.Drawing;
using System.IO;

namespace GameRes.Formats.Kaguya
{
    internal class ApsMetaData : ImageMetaData
    {
        public bool IsPacked;
        public uint PackedSize;
        public uint UnpackedSize;
        public uint DataOffset;
    }

    [Export(typeof(ImageFormat))]
    public class Aps3Format : ApFormat
    {
        public override string         Tag { get { return "APS3"; } }
        public override string Description { get { return "KaGuYa tiled image format"; } }
        public override uint     Signature { get { return 0x53504104; } } // '\x04APS'

        public Aps3Format ()
        {
            Extensions = new string[] { "aps", "parts" };
        }

        public override ImageMetaData ReadMetaData (Stream stream)
        {
            stream.Position = 4;
            if (stream.ReadByte() != '3')
                return null;
            var rect = new Rectangle (0, 0, 0, 0);
            using (var reader = new ArcView.Reader (stream))
            {
                int count = reader.ReadInt32();
                for (int i = 0; i < count; ++i)
                {
                    reader.ReadInt32();
                    int name_length = reader.ReadByte();
                    reader.BaseStream.Seek (name_length, SeekOrigin.Current);
                    int x = reader.ReadInt32();
                    int y = reader.ReadInt32();
                    int w = reader.ReadInt32() - x;
                    int h = reader.ReadInt32() - y;
                    if (name_length > 0)
                    {
                        var part_rect = new Rectangle (x, y, w, h);
                        rect = Rectangle.Union (rect, part_rect);
                    }
                    reader.BaseStream.Seek (12, SeekOrigin.Current);
                }
                uint data_size = reader.ReadUInt32();
                if (data_size > stream.Length-stream.Position)
                    return null;
                int compression = reader.ReadInt16();
                var info = new ApsMetaData
                {
                    Width = (uint)rect.Width,
                    Height = (uint)rect.Height,
                    BPP = 32,
                    IsPacked = 0 != compression,
                };
                if (0 == compression)
                {
                    info.UnpackedSize = reader.ReadUInt32();
                }
                else if (1 == compression)
                {
                    info.PackedSize = reader.ReadUInt32();
                    info.UnpackedSize = reader.ReadUInt32();
                }
                else
                    return null;
                info.DataOffset = (uint)stream.Position;
                return info;
            }
        }

        public override ImageData Read (Stream stream, ImageMetaData info)
        {
            var meta = (ApsMetaData)info;
            stream.Position = meta.DataOffset;
            byte[] image_data;
            if (meta.IsPacked)
            {
                using (var reader = new LzReader (stream, meta.PackedSize, meta.UnpackedSize))
                {
                    reader.Unpack();
                    image_data = reader.Data;
                }
            }
            else
            {
                using (var reader = new ArcView.Reader (stream))
                    image_data = reader.ReadBytes ((int)meta.UnpackedSize);
            }
            using (var unpacked = new MemoryStream (image_data))
            {
                var ap_info = base.ReadMetaData (unpacked);
                if (null == ap_info)
                    throw new InvalidFormatException();
                return base.Read (unpacked, ap_info);
            }
        }

        public override void Write (Stream file, ImageData image)
        {
            throw new System.NotImplementedException ("Aps3Format.Write not implemented");
        }
    }
}