using System;
using System.Collections.Generic;
using System.IO;
using System.Text;
using System.Drawing;
using System.Threading.Tasks;
using Switch_Toolbox;
using System.Windows.Forms;
using Switch_Toolbox.Library;
using Switch_Toolbox.Library.IO;

namespace FirstPlugin
{
    public class XTX : IFileFormat
    {
        public bool CanSave { get; set; } = false;
        public bool FileIsEdited { get; set; } = false;
        public bool FileIsCompressed { get; set; } = false;
        public string[] Description { get; set; } = new string[] { "XTX" };
        public string[] Extension { get; set; } = new string[] { "*.xtx", "*.z" };
        public string Magic { get; set; } = "DFvN ";
        public CompressionType CompressionType { get; set; } = CompressionType.None;
        public byte[] Data { get; set; }
        public string FileName { get; set; }
        public TreeNodeFile EditorRoot { get; set; }
        public bool IsActive { get; set; } = false;
        public bool UseEditMenu { get; set; } = false;
        public string FilePath { get; set; }
        public IFileInfo IFileInfo { get; set; }

        public Type[] Types
        {
            get
            {
                List<Type> types = new List<Type>();
                return types.ToArray();
            }
        }

        public void Load()
        {
            IsActive = true;
            EditorRoot = new XTXFile();
            ((XTXFile)EditorRoot).FileHandler = this;
            ((XTXFile)EditorRoot).Text = FileName;
            ((XTXFile)EditorRoot).LoadFile(Data);
        }
        public void Unload()
        {

        }
        public byte[] Save()
        {
            return null;
        }

        public class XTXFormats
        {
            public enum XTXImageFormat : uint
            {
                NVN_FORMAT_RGBA8 = 0x00000025,
                NVN_FORMAT_RGBA8_SRGB = 0x00000038,
                NVN_FORMAT_RGB10A2 = 0x0000003d,
                NVN_FORMAT_RGB565 = 0x0000003c,
                NVN_FORMAT_RGB5A1 = 0x0000003b,
                NVN_FORMAT_RGBA4 = 0x00000039,
                NVN_FORMAT_R8 = 0x00000001,
                NVN_FORMAT_RG8 = 0x0000000d,
                DXT1 = 0x00000042,
                DXT3 = 0x00000043,
                DXT5 = 0x00000044,
                BC4U = 0x00000049,
                BC4S = 0x0000004a,
                BC5U = 0x0000004b,
                BC5S = 0x0000004c,
            };

            public static uint blk_dims(uint format)
            {
                switch (format)
                {
                    case (uint)XTXImageFormat.DXT1:
                    case (uint)XTXImageFormat.DXT3:
                    case (uint)XTXImageFormat.DXT5:
                    case (uint)XTXImageFormat.BC4U:
                    case (uint)XTXImageFormat.BC4S:
                    case (uint)XTXImageFormat.BC5U:
                    case (uint)XTXImageFormat.BC5S:
                    case 0x2d:
                        return 0x44;

                    default: return 0x11;
                }
            }

            public static uint bpps(uint format)
            {
                switch (format)
                {
                    case (uint)XTXImageFormat.NVN_FORMAT_R8:
                        return 1;

                    case (uint)XTXImageFormat.NVN_FORMAT_RGBA8:
                    case (uint)XTXImageFormat.NVN_FORMAT_RGBA8_SRGB:
                    case (uint)XTXImageFormat.NVN_FORMAT_RGB10A2:
                        return 4;

                    case (uint)XTXImageFormat.NVN_FORMAT_RGB565:
                    case (uint)XTXImageFormat.NVN_FORMAT_RGB5A1:
                    case (uint)XTXImageFormat.NVN_FORMAT_RGBA4:
                    case (uint)XTXImageFormat.NVN_FORMAT_RG8:
                        return 2;

                    case (uint)XTXImageFormat.DXT1:
                    case (uint)XTXImageFormat.BC4S:
                    case (uint)XTXImageFormat.BC4U:
                        return 8;

                    case (uint)XTXImageFormat.DXT3:
                    case (uint)XTXImageFormat.DXT5:
                    case (uint)XTXImageFormat.BC5U:
                    case (uint)XTXImageFormat.BC5S:
                        return 16;
                    default: return 0x00;
                }
            }
        }

        public class XTXFile : TreeNodeFile
        {
            public uint HeaderSize { get; set; }
            public uint MajorVersion { get; set; }
            public uint MinorVersion { get; set; }
            public BlockHeader blockHeader { get; set; }
            private const int texHeadBlkType = 2;
            private const int dataBlkType = 3;

            public void LoadFile(byte[] data)
            {
                FileReader reader = new FileReader(new MemoryStream(data));
                string Signature = reader.ReadString(4, Encoding.ASCII);
                if (Signature != "DFvN")
                    throw new Exception($"Invalid signature {Signature}! Expected DFvN.");

                HeaderSize = reader.ReadUInt32();
                MajorVersion = reader.ReadUInt32();
                MinorVersion = reader.ReadUInt32();

                blockHeader = new BlockHeader();
                blockHeader.Read(reader);
            }

            public override void OnClick(TreeView treeview)
            {
                UpdateEditor();
            }

            public void UpdateEditor()
            {
                if (Viewport.Instance.gL_ControlModern1.Visible == false)
                    PluginRuntime.FSHPDockState = WeifenLuo.WinFormsUI.Docking.DockState.Document;

                XTXEditor docked = (XTXEditor)LibraryGUI.Instance.GetContentDocked(new XTXEditor());
                if (docked == null)
                {
                    docked = new XTXEditor();
                    LibraryGUI.Instance.LoadDockContent(docked, PluginRuntime.FSHPDockState);
                }
                docked.Text = Text;
                docked.Dock = DockStyle.Fill;
                docked.LoadProperty(blockHeader.textureInfo);
            }

            public class BlockHeader
            {
                public uint BlockSize { get; set; }
                public UInt64 DataSize { get; set; }
                public uint BlockType { get; set; }
                public uint GlobalBlockIndex { get; set; }
                public uint IncBlockTypeIndex { get; set; }
                public TextureInfo textureInfo { get; set; }
                public long DataOffset;

                public void Read(FileReader reader)
                {
                    string Signature = reader.ReadString(4, Encoding.ASCII);
                    if (Signature != "HBvN")
                        throw new Exception($"Invalid signature {Signature}! Expected HBvN.");

                    BlockSize = reader.ReadUInt32();
                    DataSize = reader.ReadUInt64();
                    DataOffset = reader.ReadInt64();
                    BlockType = reader.ReadUInt32();
                    GlobalBlockIndex = reader.ReadUInt32();
                    IncBlockTypeIndex = reader.ReadUInt32();

                    if (BlockType == texHeadBlkType)
                    {
                        textureInfo = new TextureInfo();
                        textureInfo.Read(reader);
                    }
                    if (BlockType == dataBlkType)
                    {

                    }
                }
            }
            public class TextureInfo : TreeNodeFile
            {
                public UInt64 DataSize { get; set; }
                public uint Alignment { get; set; }
                public uint Width { get; set; }
                public uint Height { get; set; }
                public uint Depth { get; set; }
                public uint Target { get; set; }
                public XTXFormats.XTXImageFormat Format { get; set; }
                public uint MipCount { get; set; }
                public uint SliceSize { get; set; }
                public uint[] MipOffsets { get; set; }
                public BlockHeader DataBlockHeader { get; set; }
                public List<byte[]> mipmaps = new List<byte[]>();
                public List<byte[]> compressedBlocks = new List<byte[]>();

                public void Read(FileReader reader)
                {
                    DataSize = reader.ReadUInt64();
                    Alignment = reader.ReadUInt32();
                    Width = reader.ReadUInt32();
                    Height = reader.ReadUInt32();
                    Depth = reader.ReadUInt32();
                    Target = reader.ReadUInt32();
                    Format = reader.ReadEnum<XTXFormats.XTXImageFormat>(true);
                    MipCount = reader.ReadUInt32();
                    SliceSize = reader.ReadUInt32();
                    long offPos = reader.Position;
                    MipOffsets = reader.ReadUInt32s((int)MipCount);

                    reader.Seek(offPos + 68, SeekOrigin.Begin);
                    byte[] Layout = reader.ReadBytes(8);
                    byte Sparse = reader.ReadByte();
                    reader.Seek(3);
                    long DataBlockOff = reader.Position;

                    DataBlockHeader = new BlockHeader();
                    DataBlockHeader.Read(reader);

                    reader.Seek(DataBlockOff + DataBlockHeader.DataOffset, SeekOrigin.Begin);
                    //   data = reader.ReadBytes((int)DataBlockHeader.DataSize);
                    long datastart = reader.Position;

                    Console.WriteLine(DataBlockHeader.DataSize);
                    for (int i = 0; i < MipCount; i++)
                    {
                        int size = (int)((int)DataBlockHeader.DataSize - MipOffsets[i]);
                        Console.WriteLine(size);

                        using (reader.TemporarySeek(datastart + MipOffsets[i], System.IO.SeekOrigin.Begin))
                        {
                            compressedBlocks.Add(reader.ReadBytes(size));
                        }
                        if (compressedBlocks[i].Length == 0)
                            throw new System.Exception("Empty mip size!");

                        break; //Only first mip level works?
                    }
                    reader.Seek(DataBlockOff + DataBlockHeader.DataOffset + (long)DataBlockHeader.DataSize, SeekOrigin.Begin);
                    BlockHeader EndBlockHeader = new BlockHeader();
                    EndBlockHeader.Read(reader);
                }

                public Bitmap DisplayImage(int mipLevel = 0, int arrayLevel = 0)
                {
                    LoadTexture();

                    Bitmap decomp;

                    if (Format == XTXFormats.XTXImageFormat.BC5S)
                        return DDSCompressor.DecompressBC5(mipmaps[0], (int)Width, (int)Height, true);

                    byte[] d = null;
                    if (IsCompressedFormat(Format))
                        d = DDSCompressor.DecompressBlock(mipmaps[0], (int)Width, (int)Height, GetCompressedDXGI_FORMAT(Format));
                    else
                        d = DDSCompressor.DecodePixelBlock(mipmaps[0], (int)Width, (int)Height, GetUncompressedDXGI_FORMAT(Format));

                    if (d != null)
                    {
                        decomp = BitmapExtension.GetBitmap(d, (int)Width, (int)Height);
                        return TextureData.SwapBlueRedChannels(decomp);
                    }
                    return null;
                }
                private static DDS.DXGI_FORMAT GetCompressedDXGI_FORMAT(XTXFormats.XTXImageFormat Format)
                {
                    switch (Format)
                    {
                        case XTXFormats.XTXImageFormat.DXT1: return DDS.DXGI_FORMAT.DXGI_FORMAT_BC1_UNORM;
                        case XTXFormats.XTXImageFormat.DXT3: return DDS.DXGI_FORMAT.DXGI_FORMAT_BC2_UNORM;
                        case XTXFormats.XTXImageFormat.DXT5: return DDS.DXGI_FORMAT.DXGI_FORMAT_BC3_UNORM;
                        case XTXFormats.XTXImageFormat.BC4U: return DDS.DXGI_FORMAT.DXGI_FORMAT_BC4_UNORM;
                        case XTXFormats.XTXImageFormat.BC4S: return DDS.DXGI_FORMAT.DXGI_FORMAT_BC4_SNORM;
                        case XTXFormats.XTXImageFormat.BC5U: return DDS.DXGI_FORMAT.DXGI_FORMAT_BC5_UNORM;
                        case XTXFormats.XTXImageFormat.BC5S: return DDS.DXGI_FORMAT.DXGI_FORMAT_BC5_SNORM;
                        default:
                            throw new Exception($"Cannot convert format {Format}");
                    }
                }
                private static bool IsCompressedFormat(XTXFormats.XTXImageFormat Format)
                {
                    switch (Format)
                    {
                        case XTXFormats.XTXImageFormat.DXT1: 
                        case XTXFormats.XTXImageFormat.DXT3:
                        case XTXFormats.XTXImageFormat.DXT5: 
                        case XTXFormats.XTXImageFormat.BC4U: 
                        case XTXFormats.XTXImageFormat.BC4S: 
                        case XTXFormats.XTXImageFormat.BC5U: 
                        case XTXFormats.XTXImageFormat.BC5S: 
                            return true;
                        default:
                            return false;
                    }
                }
                private static DDS.DXGI_FORMAT GetUncompressedDXGI_FORMAT(XTXFormats.XTXImageFormat Format)
                {
                    switch (Format)
                    {
                        case XTXFormats.XTXImageFormat.NVN_FORMAT_R8: return DDS.DXGI_FORMAT.DXGI_FORMAT_R8_UNORM;
                        case XTXFormats.XTXImageFormat.NVN_FORMAT_RG8: return DDS.DXGI_FORMAT.DXGI_FORMAT_R8G8_UNORM;
                        case XTXFormats.XTXImageFormat.NVN_FORMAT_RGB10A2: return DDS.DXGI_FORMAT.DXGI_FORMAT_R10G10B10A2_UNORM;
                        case XTXFormats.XTXImageFormat.NVN_FORMAT_RGB565: return DDS.DXGI_FORMAT.DXGI_FORMAT_B5G6R5_UNORM;
                        case XTXFormats.XTXImageFormat.NVN_FORMAT_RGB5A1: return DDS.DXGI_FORMAT.DXGI_FORMAT_B5G5R5A1_UNORM;
                        case XTXFormats.XTXImageFormat.NVN_FORMAT_RGBA4: return DDS.DXGI_FORMAT.DXGI_FORMAT_B4G4R4A4_UNORM;
                        case XTXFormats.XTXImageFormat.NVN_FORMAT_RGBA8: return DDS.DXGI_FORMAT.DXGI_FORMAT_R8G8B8A8_UNORM;
                        case XTXFormats.XTXImageFormat.NVN_FORMAT_RGBA8_SRGB: return DDS.DXGI_FORMAT.DXGI_FORMAT_R8G8B8A8_UNORM_SRGB;
                        default:
                            throw new Exception($"Cannot convert format {Format}");
                    }
                }

                public void LoadTexture()
                {
                    mipmaps.Clear();

                    Console.WriteLine(Format);

                    uint blk_dim = XTXFormats.blk_dims((uint)((int)Format >> 8));
                    uint blkWidth = blk_dim >> 4;
                    uint blkHeight = blk_dim & 0xF;

                    uint blockHeight = TegraX1Swizzle.GetBlockHeight(TegraX1Swizzle.DIV_ROUND_UP(Height, blkHeight));
                    uint BlockHeightLog2 = (uint)Convert.ToString(blockHeight, 2).Length - 1;

                    int linesPerBlockHeight = (1 << (int)BlockHeightLog2) * 8;

                    int TileMode = 0;

                    uint bpp = XTXFormats.bpps((uint)Format);

                    int blockHeightShift = 0;
                    for (int mipLevel = 0; mipLevel < compressedBlocks.Count; mipLevel++)
                    {
                        uint width = (uint)Math.Max(1, Width >> mipLevel);
                        uint height = (uint)Math.Max(1, Height >> mipLevel);

                        //  uint size = width * height * bpp;
                        uint size = TegraX1Swizzle.DIV_ROUND_UP(width, blkWidth) * TegraX1Swizzle.DIV_ROUND_UP(height, blkHeight) * bpp;

                        Console.WriteLine(mipLevel + " " + size);
                            
                        if (TegraX1Swizzle.pow2_round_up(TegraX1Swizzle.DIV_ROUND_UP(height, blkWidth)) < linesPerBlockHeight)
                            blockHeightShift += 1;

                        byte[] result = TegraX1Swizzle.deswizzle(width, height, blkWidth, blkHeight, (int)Target, bpp, (uint)TileMode, (int)Math.Max(0, BlockHeightLog2 - blockHeightShift), compressedBlocks[mipLevel]);
                        //Create a copy and use that to remove uneeded data
                        byte[] result_ = new byte[size];
                        Array.Copy(result, 0, result_, 0, size);

                        mipmaps.Add(result_);
                        Console.WriteLine("bpp " + bpp);
                        Console.WriteLine("result_ " + size);
                        Console.WriteLine("width " + width);
                        Console.WriteLine("height " + height);
                    }
                }
            }

        }
    }
}