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

namespace FirstPlugin
{
    public class NUTEXB : 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[] { "TEX" };
        public string[] Extension { get; set; } = new string[] { "*.nutexb" };
        public string Magic { get; set; } = "XET";
        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 enum NUTEXImageFormat : uint
        {
            R8G8B8A8_UNORM = 0x00,
            R8G8B8A8_SRGB = 0x05,
            BC1_UNORM = 0x80,
            BC1_SRGB = 0x85,
            BC2_UNORM = 0x90,
            BC2_SRGB = 0x95,
            BC3_UNORM = 0xa0,
            BC3_SRGB = 0xa5,
            BC4_UNORM = 0xb0,
            BC4_SNORM = 0xb5,
            BC5_UNORM = 0xc0,
            BC5_SNORM = 0xc5,
            BC6_UFLOAT = 0xd7,
            BC7_UNORM = 0xe0,
            BC7_SRGB = 0xe5,
        };

        public static uint blk_dims(byte format)
        {
            switch (format)
            {
                case (byte)NUTEXImageFormat.BC1_UNORM:
                case (byte)NUTEXImageFormat.BC1_SRGB:
                case (byte)NUTEXImageFormat.BC2_UNORM:
                case (byte)NUTEXImageFormat.BC2_SRGB:
                case (byte)NUTEXImageFormat.BC3_UNORM:
                case (byte)NUTEXImageFormat.BC3_SRGB:
                case (byte)NUTEXImageFormat.BC4_UNORM:
                case (byte)NUTEXImageFormat.BC4_SNORM:
                case (byte)NUTEXImageFormat.BC5_UNORM:
                case (byte)NUTEXImageFormat.BC5_SNORM:
                case (byte)NUTEXImageFormat.BC6_UFLOAT:
                case (byte)NUTEXImageFormat.BC7_UNORM:
                case (byte)NUTEXImageFormat.BC7_SRGB:
                    return 0x44;

                default: return 0x11;
            }
        }

        public static uint bpps(byte format)
        {
            switch (format)
            {
                case (byte)NUTEXImageFormat.R8G8B8A8_UNORM:
                case (byte)NUTEXImageFormat.R8G8B8A8_SRGB:
                    return 4;

                case (byte)NUTEXImageFormat.BC1_UNORM:
                case (byte)NUTEXImageFormat.BC1_SRGB:
                case (byte)NUTEXImageFormat.BC4_UNORM:
                case (byte)NUTEXImageFormat.BC4_SNORM:
                    return 8;

                case (byte)NUTEXImageFormat.BC2_UNORM:
                case (byte)NUTEXImageFormat.BC2_SRGB:
                case (byte)NUTEXImageFormat.BC3_UNORM:
                case (byte)NUTEXImageFormat.BC3_SRGB:
                case (byte)NUTEXImageFormat.BC5_UNORM:
                case (byte)NUTEXImageFormat.BC5_SNORM:
                case (byte)NUTEXImageFormat.BC6_UFLOAT:
                case (byte)NUTEXImageFormat.BC7_UNORM:
                case (byte)NUTEXImageFormat.BC7_SRGB:
                    return 16;
                default: return 0x00;
            }
        }

        public Type[] Types
        {
            get
            {
                List<Type> types = new List<Type>();
                types.Add(typeof(MenuExt));
                return types.ToArray();
            }
        }
        class MenuExt : IFileMenuExtension
        {
            public ToolStripItemDark[] NewFileMenuExtensions => null;
            public ToolStripItemDark[] ToolsMenuExtensions => newFileExt;
            public ToolStripItemDark[] TitleBarExtensions => null;
            public ToolStripItemDark[] CompressionMenuExtensions => null;
            public ToolStripItemDark[] ExperimentalMenuExtensions => null;

            ToolStripItemDark[] newFileExt = new ToolStripItemDark[1];
            public MenuExt()
            {
                newFileExt[0] = new ToolStripItemDark("Batch Export NUTEXB");
                newFileExt[0].Click += Export;
            }
            private void Export(object sender, EventArgs args)
            {
                OpenFileDialog ofd = new OpenFileDialog();
                ofd.Multiselect = true;

                if (ofd.ShowDialog() == DialogResult.OK)
                {
                    foreach (string file in ofd.FileNames)
                    {
                        NuTex texture = new NuTex();
                        texture.Read(new FileReader(file));

                        Console.WriteLine(texture.Format.ToString("x") + " " + file + " " + texture.Text);

                        /*
                        try
                        {
                            Bitmap bitmap = texture.DisplayImage();

                            if (bitmap != null)
                                bitmap.Save(System.IO.Path.GetDirectoryName(ofd.FileName) + texture.Text + ".png");
                            else
                                Console.WriteLine(" Not supported Format! " + texture.Format);

                            if (bitmap != null)
                                bitmap.Dispose();
                        }
                        catch
                        {
                            Console.WriteLine();
                        }
                        texture = null;
                        GC.Collect();*/
                    }
                }
            }
        }
        public class NuTex : TreeNodeFile
        {
            public uint Width;
            public uint Height;
            public byte Format;
            public uint[] mipSizes;
            public uint Alignment;
            public List<List<byte[]>> mipmaps = new List<List<byte[]>>();
            public List<List<byte[]>> blocksCompressed = new List<List<byte[]>>();
            bool IsSwizzled = true;

            MenuItem export = new MenuItem("Export");

            public NuTex()
            {
                ImageKey = "Texture";
                SelectedImageKey = "Texture";

                ContextMenu = new ContextMenu();
                ContextMenu.MenuItems.Add(export);

                export.Click += Export;
            }
            private void Export(object sender, EventArgs args)
            {
                SaveFileDialog sfd = new SaveFileDialog();
                sfd.FileName = Text;
                sfd.DefaultExt = "png";
                sfd.Filter = "Supported Formats|*.dds; *.png;*.tga;*.jpg;*.tiff|" +
                             "Microsoft DDS |*.dds|" +
                             "Portable Network Graphics |*.png|" +
                             "Joint Photographic Experts Group |*.jpg|" +
                             "Bitmap Image |*.bmp|" +
                             "Tagged Image File Format |*.tiff|" +
                             "All files(*.*)|*.*";

                if (sfd.ShowDialog() == DialogResult.OK)
                {
                    Export(sfd.FileName);
                }
            }
            public void Export(string FileName, bool ExportSurfaceLevel = false,
          bool ExportMipMapLevel = false, int SurfaceLevel = 0, int MipLevel = 0)
            {
                string ext = System.IO.Path.GetExtension(FileName);
                ext = ext.ToLower();
                switch (ext)
                {
                    case ".dds":
                        SaveDDS(FileName);
                        break;
                    default:
                        SaveBitMap(FileName);
                        break;
                }
            }
            internal void SaveBitMap(string FileName, int SurfaceLevel = 0, int MipLevel = 0)
            {
                Bitmap bitMap = DisplayTexture(SurfaceLevel, MipLevel);

                bitMap.Save(FileName);
            }
            internal void SaveDDS(string FileName)
            {
                DDS dds = new DDS();
                dds.header = new DDS.Header();
                dds.header.width = Width;
                dds.header.height = Height;
                dds.header.mipmapCount = (uint)mipmaps.Count;

                bool IsDX10 = false;

                IsDX10 = true;
                dds.DX10header = new DDS.DX10Header();
                dds.DX10header.DXGI_Format = DDS.DXGI_FORMAT.DXGI_FORMAT_BC7_UNORM;

                if (IsDX10)
                    dds.header.ddspf.fourCC = "DX10";

                dds.Save(dds, FileName, IsDX10, mipmaps);
            }
            public void Read(FileReader reader)
            {
                ImageKey = "Texture";
                SelectedImageKey = "Texture";

                long pos = reader.BaseStream.Length;
                string magic = reader.ReadMagic((int)pos - 7, 3);//Check magic first!

                if (magic != "XET")
                    throw new Exception($"Invalid magic! Expected XET but got {magic}");

                reader.Seek(pos - 112, System.IO.SeekOrigin.Begin); //Subtract size where the name occurs
                byte padding = reader.ReadByte();
                Text = reader.ReadString(Syroot.BinaryData.BinaryStringFormat.ZeroTerminated);

                reader.Seek(pos - 48, System.IO.SeekOrigin.Begin); //Subtract size of header
                uint padding2 = reader.ReadUInt32();
                Width = reader.ReadUInt32();
                Height = reader.ReadUInt32();
                uint ArrayCount = reader.ReadUInt32(); //6 for cubemaps
                Format = reader.ReadByte();
                byte unk = reader.ReadByte(); //Might be unorm/snorm/srgb
                ushort padding3 = reader.ReadUInt16();
                uint unk2 = reader.ReadUInt32();
                uint mipCount = reader.ReadUInt32();
                Alignment = reader.ReadUInt32();
                int unk3 = reader.ReadInt32();
                int imagesize = reader.ReadInt32();

                reader.Seek(pos - 176, System.IO.SeekOrigin.Begin); //Get mipmap sizes
                mipSizes = reader.ReadUInt32s((int)mipCount);

                List<byte[]> mips = new List<byte[]>();
                reader.Seek(0, System.IO.SeekOrigin.Begin);

                if (mipCount == 1 && IsSwizzled)
                {
                    mips.Add(reader.ReadBytes((int)imagesize));
                    blocksCompressed.Add(mips);
                }
                else
                {
                    for (int arrayLevel = 0; arrayLevel < ArrayCount; arrayLevel++)
                    {
                        for (int mipLevel = 0; mipLevel < mipCount; mipLevel++)
                        {
                            mips.Add(reader.ReadBytes((int)mipSizes[mipLevel]));
                            break; //Don't load mip maps yet. They break for some reason????
                        }
                        blocksCompressed.Add(mips);
                    }
                }
            }

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

            public Bitmap DisplayTexture(int DisplayMipIndex = 0, int ArrayIndex = 0)
            {
                if (IsSwizzled)
                    LoadTexture();
                else
                    mipmaps.Add(blocksCompressed[0]);

                if (mipmaps.Count <= 0)
                {
                    throw new Exception("No texture data found");
                }

                uint width = (uint)Math.Max(1, Width >> DisplayMipIndex);
                uint height = (uint)Math.Max(1, Height >> DisplayMipIndex);

                byte[] data = mipmaps[ArrayIndex][DisplayMipIndex];
                return DecodeBlock(data, width, height, (NUTEXImageFormat)Format);
            }
            public static Bitmap DecodeBlock(byte[] data, uint Width, uint Height, NUTEXImageFormat Format)
            {
                Bitmap decomp;

                if (Format == NUTEXImageFormat.BC5_SNORM)
                    return DDSCompressor.DecompressBC5(data, (int)Width, (int)Height, true);

                byte[] d = null;
                if (IsCompressedFormat(Format))
                    d = DDSCompressor.DecompressBlock(data, (int)Width, (int)Height, GetCompressedDXGI_FORMAT(Format));
                else
                    d = DDSCompressor.DecodePixelBlock(data, (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 GetUncompressedDXGI_FORMAT(NUTEXImageFormat Format)
            {
                switch (Format)
                {
                    case NUTEXImageFormat.R8G8B8A8_UNORM: return DDS.DXGI_FORMAT.DXGI_FORMAT_R8G8B8A8_UNORM;
                    case NUTEXImageFormat.R8G8B8A8_SRGB: return DDS.DXGI_FORMAT.DXGI_FORMAT_R8G8B8A8_UNORM_SRGB;
                    default:
                        throw new Exception($"Cannot convert format {Format}");
                }
            }
            private static DDS.DXGI_FORMAT GetCompressedDXGI_FORMAT(NUTEXImageFormat Format)
            {
                switch (Format)
                {
                    case NUTEXImageFormat.BC1_UNORM: return DDS.DXGI_FORMAT.DXGI_FORMAT_BC1_UNORM;
                    case NUTEXImageFormat.BC1_SRGB: return DDS.DXGI_FORMAT.DXGI_FORMAT_BC1_UNORM_SRGB;
                    case NUTEXImageFormat.BC2_UNORM: return DDS.DXGI_FORMAT.DXGI_FORMAT_BC2_UNORM;
                    case NUTEXImageFormat.BC2_SRGB: return DDS.DXGI_FORMAT.DXGI_FORMAT_BC2_UNORM_SRGB;
                    case NUTEXImageFormat.BC3_UNORM: return DDS.DXGI_FORMAT.DXGI_FORMAT_BC3_UNORM;
                    case NUTEXImageFormat.BC3_SRGB: return DDS.DXGI_FORMAT.DXGI_FORMAT_BC3_UNORM_SRGB;
                    case NUTEXImageFormat.BC4_UNORM: return DDS.DXGI_FORMAT.DXGI_FORMAT_BC4_UNORM;
                    case NUTEXImageFormat.BC4_SNORM: return DDS.DXGI_FORMAT.DXGI_FORMAT_BC4_SNORM;
                    case NUTEXImageFormat.BC5_UNORM: return DDS.DXGI_FORMAT.DXGI_FORMAT_BC5_UNORM;
                    case NUTEXImageFormat.BC5_SNORM: return DDS.DXGI_FORMAT.DXGI_FORMAT_BC5_SNORM;
                    case NUTEXImageFormat.BC6_UFLOAT: return DDS.DXGI_FORMAT.DXGI_FORMAT_BC6H_UF16;
                    case NUTEXImageFormat.BC7_UNORM: return DDS.DXGI_FORMAT.DXGI_FORMAT_BC7_UNORM;
                    case NUTEXImageFormat.BC7_SRGB: return DDS.DXGI_FORMAT.DXGI_FORMAT_BC7_UNORM_SRGB;
                    default:
                        throw new Exception($"Cannot convert format {Format}");
                }
            }
            private static bool IsCompressedFormat(NUTEXImageFormat Format)
            {
                switch (Format)
                {
                    case NUTEXImageFormat.BC1_UNORM:
                    case NUTEXImageFormat.BC1_SRGB:
                    case NUTEXImageFormat.BC2_UNORM:
                    case NUTEXImageFormat.BC2_SRGB:
                    case NUTEXImageFormat.BC3_UNORM:
                    case NUTEXImageFormat.BC3_SRGB:
                    case NUTEXImageFormat.BC4_UNORM:
                    case NUTEXImageFormat.BC4_SNORM:
                    case NUTEXImageFormat.BC5_UNORM:
                    case NUTEXImageFormat.BC5_SNORM:
                    case NUTEXImageFormat.BC6_UFLOAT:
                    case NUTEXImageFormat.BC7_UNORM:
                    case NUTEXImageFormat.BC7_SRGB:
                        return true;
                    default:
                        return false;
                }
            }

            public void LoadTexture(int target = 1)
            {
                mipmaps.Clear();

                uint blk_dim = blk_dims(Format);
                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;
                uint tileMode = 0;

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

                uint bpp = bpps(Format);

                for (int arrayLevel = 0; arrayLevel < blocksCompressed.Count; arrayLevel++)
                {
                    int blockHeightShift = 0;

                    List<byte[]> mips = new List<byte[]>();
                    for (int mipLevel = 0; mipLevel < blocksCompressed[arrayLevel].Count; mipLevel++)
                    {
                        uint width = (uint)Math.Max(1, Width >> mipLevel);
                        uint height = (uint)Math.Max(1, Height >> mipLevel);

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

                        if (TegraX1Swizzle.pow2_round_up(TegraX1Swizzle.DIV_ROUND_UP(height, blkWidth)) < linesPerBlockHeight)
                            blockHeightShift += 1;

                        Console.WriteLine($"{blk_dim.ToString("x")} {bpp} {width} {height} {linesPerBlockHeight} {blkWidth} {blkHeight} {size} { blocksCompressed[arrayLevel][mipLevel].Length}");

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

                        mips.Add(result_);
                    }
                    mipmaps.Add(mips);
                }
            }

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

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

        public void Load()
        {
            IsActive = true;
            EditorRoot = new NuTex();
            ((NuTex)EditorRoot).FileHandler = this;
            ((NuTex)EditorRoot).Read(new FileReader(Data));
        }
        public void Unload()
        {

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