//! \file       ArcDAT.cs
//! \date       2018 Jan 04
//! \brief      Weapon event CG archives.
//
// 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;
using System.Collections.Generic;
using System.ComponentModel.Composition;
using System.IO;
using System.Windows.Media;

// [000331][WEAPON] Seido Techou

namespace GameRes.Formats.Weapon
{
    internal class CgEntry : Entry
    {
        public uint     Height;
    }

#if DEBUG
    [Export(typeof(ArchiveFormat))]
#endif
    public class DatOpener : ArchiveFormat
    {
        public override string         Tag { get { return "DAT/WEAPON"; } }
        public override string Description { get { return "Weapon resource archive"; } }
        public override uint     Signature { get { return 0; } }
        public override bool  IsHierarchic { get { return false; } }
        public override bool      CanWrite { get { return false; } }

        const uint DefaultWidth = 800;

        public override ArcFile TryOpen (ArcView file)
        {
            var arc_name = Path.GetFileName (file.Name);
            uint[] height_table;
            if (!KnownFileTables.TryGetValue (arc_name, out height_table))
                return null;
            uint stride = DefaultWidth * 2;
            uint offset = 0;
            var base_name = Path.GetFileNameWithoutExtension (arc_name);
            var dir = new List<Entry> (height_table.Length);
            for (int i = 0; i < height_table.Length; ++i)
            {
                var name = string.Format ("{0}#{1:D4}", base_name, i);
                var entry = new CgEntry {
                    Name = name,
                    Type = "image",
                    Offset = offset,
                    Size = height_table[i] * stride,
                    Height = height_table[i],
                };
                if (!entry.CheckPlacement (file.MaxOffset))
                    return null;
                dir.Add (entry);
                offset += entry.Size;
            }
            return new ArcFile (file, this, dir);
        }

        public override IImageDecoder OpenImage (ArcFile arc, Entry entry)
        {
            var cgent = (CgEntry)entry;
            var input = arc.File.CreateStream (entry.Offset, entry.Size);
            var info = new ImageMetaData { Width = DefaultWidth, Height = cgent.Height, BPP = 16 };
            return new CgDecoder (input, info);
        }

        static readonly Dictionary<string, uint[]> KnownFileTables = new Dictionary<string, uint[]> (StringComparer.InvariantCultureIgnoreCase) {
            { "eventcg.dat",
                new uint[] {
                    600, 600, 600, 600, 600, 1200, 600, 600, 600, 600, 600, 600, 1200, 600, 600, 600, 1200,
                    600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600,
                    600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600,
                    600, 600, 600, 600, 600, 1200, 600, 600, 600, 1200, 600, 600, 600, 600, 600, 600,
                }
            },
            { "buy.dat",
                new uint[] {
                    900, 34
                }
            },
        };
    }

    internal class CgDecoder : BinaryImageDecoder
    {
        public CgDecoder (IBinaryStream input, ImageMetaData info) : base (input, info)
        {
        }

        protected override ImageData GetImageData ()
        {
            int stride = (int)Info.Width * 2;
            var pixels = m_input.ReadBytes (stride * (int)Info.Height);
            for (int i = 0; i < pixels.Length; i += 2)
            {
                int hi = pixels[i] << 2 | (pixels[i+1] & 3);
                int lo = pixels[i+1] >> 2 | (pixels[i] & ~0x1F);
                pixels[i] = (byte)lo;
                pixels[i+1] = (byte)hi;
            }
            return ImageData.Create (Info, PixelFormats.Bgr555, null, pixels, stride);
        }
    }
}