using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Toolbox;
using System.Windows.Forms;
using Toolbox.Library;
using Toolbox.Library.IO;
using Toolbox.Library.Forms;

namespace FirstPlugin
{
    public class CTXB : TreeNodeFile, IFileFormat, ITextureIconLoader
    {
        public FileType FileType { get; set; } = FileType.Archive;

        public bool CanSave { get; set; }
        public string[] Description { get; set; } = new string[] { "CTXB" };
        public string[] Extension { get; set; } = new string[] { "*.ctxb" };
        public string FileName { get; set; }
        public string FilePath { get; set; }
        public IFileInfo IFileInfo { get; set; }

        public bool Identify(System.IO.Stream stream)
        {
            using (var reader = new Toolbox.Library.IO.FileReader(stream, true))
            {
                return reader.CheckSignature(4, "ctxb");
            }
        }

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

        public List<STGenericTexture> IconTextureList
        {
            get
            {
                List<STGenericTexture> textures = new List<STGenericTexture>();
                foreach (STGenericTexture node in Nodes)
                    textures.Add(node);

                return textures;
            }
            set { }
        }

        public Header header;

        public void Load(System.IO.Stream stream)
        {
            Text = FileName;

            header = new Header();
            header.Read(new FileReader(stream), this);
        }

        public void Unload()
        {

        }

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

        public class Header
        {
            public List<Chunk> Chunks = new List<Chunk>();

            public void Read(FileReader reader, CTXB ctxb)
            {
                string Magic = reader.ReadSignature(4, "ctxb");
                uint FileSize = reader.ReadUInt32();
                uint ChunkCount = reader.ReadUInt32();
                reader.ReadUInt32(); //padding
                uint ChunkOffset = reader.ReadUInt32();
                uint TextureDataOffset = reader.ReadUInt32();

                for (int i = 0; i < ChunkCount; i++)
                    Chunks.Add(new Chunk(reader));

                for (int i = 0; i < ChunkCount; i++)
                {
                    for (int t = 0; t < Chunks[i].Textures.Count; t++)
                    {
                        var texWrapper = new TextureWrapper();
                        texWrapper.Text = $"Texture {t}";
                        texWrapper.ImageKey = "texture";
                        texWrapper.SelectedImageKey = texWrapper.ImageKey;

                        if (Chunks[i].Textures[t].Name != string.Empty)
                            texWrapper.Text = Chunks[i].Textures[t].Name;

                        texWrapper.Width = Chunks[i].Textures[t].Width;
                        texWrapper.Height = Chunks[i].Textures[t].Height;
                        texWrapper.Format = CTR_3DS.ConvertPICAToGenericFormat(Chunks[i].Textures[t].PicaFormat);

                        reader.SeekBegin(TextureDataOffset + Chunks[i].Textures[t].DataOffset);
                        texWrapper.ImageData = reader.ReadBytes((int)Chunks[i].Textures[t].ImageSize);
                        ctxb.Nodes.Add(texWrapper);
                    }
                }
            }

            public class Chunk
            {
                public readonly string Magic = "tex ";

                public List<Texture> Textures = new List<Texture>();

                public Chunk(FileReader reader)
                {
                    reader.ReadSignature(4, Magic);
                    uint SectionSize = reader.ReadUInt32();
                    uint TextureCount = reader.ReadUInt32();
                    for (int i = 0; i < TextureCount; i++)
                        Textures.Add(new Texture(reader));
                }
            }
        }

        public class Texture
        {
            public ushort MaxLevel { get; set; }
            public ushort Unknown { get; set; }
            public ushort Width { get; set; }
            public ushort Height { get; set; }
            public string Name { get; set; }

            public uint ImageSize { get; set; }
            public uint DataOffset { get; set; }

            public CTR_3DS.PICASurfaceFormat PicaFormat;

            public byte[] ImageData;

            public enum TextureFormat : uint
            {
                ETC1 = 0x0000675A,
                ETC1A4 = 0x0000675B,
                RGBA8 = 0x14016752,
                RGBA4444 = 0x80336752,
                RGBA5551 = 0x80346752,
                RGB565 = 0x83636754,
                RGB8 = 0x14016754,
                A8 = 0x14016756,
                L8 = 0x14016757,
                L4 = 0x67616757,
                LA8 = 0x14016758,
            }

            public Texture(FileReader reader)
            {
                ImageSize = reader.ReadUInt32();
                MaxLevel = reader.ReadUInt16();
                Unknown = reader.ReadUInt16();
                Width = reader.ReadUInt16();
                Height = reader.ReadUInt16();
                TextureFormat Format = reader.ReadEnum<TextureFormat>(true);
                DataOffset = reader.ReadUInt32();
                Name = reader.ReadString(16).TrimEnd('\0');

                PicaFormat = ToPica(Format);
            }

            public void Write(FileWriter writer)
            {
                TextureFormat Format = TextureFormat.A8;

                writer.Write(ImageSize);
                writer.Write(MaxLevel);
                writer.Write(Unknown);
                writer.Write((ushort)Width);
                writer.Write((ushort)Height);
                writer.Write(Format, true);
                writer.Write(DataOffset);
                writer.Write(DataOffset);
            }

            private static CTR_3DS.PICASurfaceFormat ToPica(TextureFormat format)
            {
                switch (format)
                {
                    case TextureFormat.A8: return CTR_3DS.PICASurfaceFormat.A8;
                    case TextureFormat.ETC1: return CTR_3DS.PICASurfaceFormat.ETC1;
                    case TextureFormat.ETC1A4: return CTR_3DS.PICASurfaceFormat.ETC1A4;
                    case TextureFormat.L4: return CTR_3DS.PICASurfaceFormat.L4;
                    case TextureFormat.L8: return CTR_3DS.PICASurfaceFormat.L8;
                    case TextureFormat.LA8: return CTR_3DS.PICASurfaceFormat.LA8;
                    case TextureFormat.RGB565: return CTR_3DS.PICASurfaceFormat.RGB565;
                    case TextureFormat.RGBA4444: return CTR_3DS.PICASurfaceFormat.RGBA4;
                    case TextureFormat.RGBA5551: return CTR_3DS.PICASurfaceFormat.RGBA5551;
                    case TextureFormat.RGBA8: return CTR_3DS.PICASurfaceFormat.RGBA8;
                    case TextureFormat.RGB8: return CTR_3DS.PICASurfaceFormat.RGB8;
                    default:
                        throw new Exception($"Unsupported format! {format}");
                }
            }
        }

        public class TextureWrapper : STGenericTexture
        {
            public byte[] ImageData;

            public override bool CanEdit { get; set; } = false;
            public override TEX_FORMAT[] SupportedFormats
            {
                get
                {
                    return new TEX_FORMAT[]
                    {
                    TEX_FORMAT.B5G6R5_UNORM,
                    TEX_FORMAT.R8G8_UNORM,
                    TEX_FORMAT.B5G5R5A1_UNORM,
                    TEX_FORMAT.B4G4R4A4_UNORM,
                    TEX_FORMAT.LA8,
                    TEX_FORMAT.HIL08,
                    TEX_FORMAT.L8,
                    TEX_FORMAT.A8_UNORM,
                    TEX_FORMAT.LA4,
                    TEX_FORMAT.A4,
                    TEX_FORMAT.ETC1_UNORM,
                    TEX_FORMAT.ETC1_A4,
                };
                }
            }

            public TextureWrapper()
            {
                PlatformSwizzle = PlatformSwizzle.Platform_3DS;
            }

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

            private void UpdateEditor()
            {
                ImageEditorBase editor = (ImageEditorBase)LibraryGUI.GetActiveContent(typeof(ImageEditorBase));
                if (editor == null)
                {
                    editor = new ImageEditorBase();
                    editor.Dock = DockStyle.Fill;
                    LibraryGUI.LoadEditor(editor);
                }

                editor.Text = Text;
                editor.LoadProperties(GenericProperties);
                editor.LoadImage(this);
            }

            public override void SetImageData(System.Drawing.Bitmap bitmap, int ArrayLevel)
            {

            }

            public override byte[] GetImageData(int ArrayLevel = 0, int MipLevel = 0)
            {
                return ImageData;
            }
        }
    }
}