/*
 *                     GNU AFFERO GENERAL PUBLIC LICENSE
 *                       Version 3, 19 November 2007
 *  Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
 *  Everyone is permitted to copy and distribute verbatim copies
 *  of this license document, but changing it is not allowed.
 */

using System;
using System.Collections.Generic;
using System.IO;
using System.IO.Compression;
using System.Linq;
using System.Xml.Serialization;
using UVtools.Core.Extensions;
using UVtools.Core.Operations;

namespace UVtools.Core.FileFormats
{
    #region Sub Classes
    [Serializable]
    [XmlRoot(ElementName = "root")]
    public class VDARoot
    {
        [Serializable]
        public class VDAFileInfo
        {
            [Serializable]
            public class VDAVersion
            {
                public ushort Major { get; set; } = 1;
                public ushort Minor { get; set; } = 2;

            }

            [Serializable]
            public class VDAWritten
            {
                [Serializable]
                [XmlRoot(ElementName = "By")]
                public class VDABy
                {
                    [XmlAttribute]
                    public string ApplicationName { get; set; } = About.Software;

                    [XmlAttribute]
                    public string ApplicationVersion { get; set; } = About.VersionStr;

                    public override string ToString()
                    {
                        return $"{ApplicationName} v{ApplicationVersion}";
                    }

                    public void Reset()
                    {
                        ApplicationName = About.Software;
                        ApplicationVersion = About.VersionStr;
                    }
                }

                public VDABy By { get; set; } = new();

                public string When { get; set; } = DateTime.Now.ToString("u");

                public void Reset()
                {
                    When = DateTime.Now.ToString("u");
                    By.Reset();
                }
            }


            public VDAVersion Version { get; set; } = new();

            public VDAWritten Written { get; set; } = new();
        }

        [Serializable]
        public class VDASlices
        {
            public ushort Count { get; set; } = 1;

            [XmlElement("thickness")]
            public float LayerHeight { get; set; }

            [XmlElement("startHeight")]
            public float StartHeight { get; set; }

            [XmlElement("endHeight")]
            public float EndHeight { get; set; }

            [XmlElement("layersCount")]
            public uint LayerCount { get; set; }
        }

        [Serializable]
        public class VDAMachines
        {
            public string FileType { get; set; } = "ZIP File";
            public string Resolution { get; set; } = "1920*1080P";
            public string PixelXSize { get; set; } = "50um";
            public string PixelYSize { get; set; } = "50um";

            [XmlElement("Anti-Aliasing")] 
            public byte AntiAliasing { get; set; } = 1;

            public float XLength { get; set; }
            public float YWidth { get; set; }
            public float ZHeight { get; set; }
        }

        public class VDALayer
        {
            [XmlElement("Index")]
            public uint Index { get; set; }

            [XmlElement("zvalue")]
            public float ZPosition { get; set; }

            [XmlElement("filename")]
            public string Filename { get; set; }

            public VDALayer()
            {
            }

            public VDALayer(uint index, float zPosition, string filename)
            {
                Index = index;
                ZPosition = zPosition;
                Filename = filename;
            }
        }


        public VDAFileInfo FileInfo { get; set; } = new();
        public VDASlices Slices { get; set; } = new();
        public VDAMachines Machines { get; set; } = new();
        public List<VDALayer> Layers { get; set; } = new();
    }
    #endregion

    public class VDAFile : FileFormat
    {
        #region Constants

        #endregion

        #region Properties
        public VDARoot ManifestFile { get; set; } = new ();

        public override FileFormatType FileType => FileFormatType.Archive;

        public override FileExtension[] FileExtensions { get; } = {
            new("vda.zip", "Voxeldance Additive Zip")
        };

        public override uint ResolutionX
        {
            get
            {
                var resolution = ManifestFile.Machines.Resolution.Split('*', StringSplitOptions.TrimEntries);
                if (resolution.Length < 2) return 0;
                uint.TryParse(resolution[0], out var xRes);
                return xRes;
            }
            set
            {
                ManifestFile.Machines.Resolution = $"{value}*{ResolutionY}P";
                RaisePropertyChanged();
            }
        }

        public override uint ResolutionY
        {
            get
            {
                var resolution = ManifestFile.Machines.Resolution.Split('*', StringSplitOptions.TrimEntries);
                if (resolution.Length < 2) return 0;
                resolution[1] = resolution[1].TrimEnd('P');
                uint.TryParse(resolution[1], out var yRes);
                return yRes;
            }
            set
            {
                ManifestFile.Machines.Resolution = $"{ResolutionX}*{value}P";
                RaisePropertyChanged();
            }
        }

        public override float DisplayWidth
        {
            get
            {
                if (ManifestFile.Machines.XLength > 0) return ManifestFile.Machines.XLength;

                var umStr= ManifestFile.Machines.PixelXSize.Replace("um", string.Empty, StringComparison.OrdinalIgnoreCase);

                if (ushort.TryParse(umStr, out var um) && um > 0)
                {
                    return (float) Math.Round(ResolutionX * um / 1000f, 2);
                }

                return ManifestFile.Machines.XLength;
            }
            set
            {
                ManifestFile.Machines.XLength = (float) Math.Round(value, 2);
                ManifestFile.Machines.PixelXSize = $"{Math.Round(value / ResolutionX * 1000, 2)}um";
                RaisePropertyChanged();
            }
        }

        public override float DisplayHeight
        {
            get
            {
                if (ManifestFile.Machines.YWidth > 0) return ManifestFile.Machines.YWidth;

                var umStr = ManifestFile.Machines.PixelYSize.Replace("um", string.Empty, StringComparison.OrdinalIgnoreCase);

                if (ushort.TryParse(umStr, out var um) && um > 0)
                {
                    return (float)Math.Round(ResolutionY * um / 1000f, 2);
                }

                return ManifestFile.Machines.YWidth;
            }
            set
            {
                ManifestFile.Machines.YWidth = (float)Math.Round(value, 2);
                ManifestFile.Machines.PixelYSize = $"{Math.Round(value / ResolutionY * 1000, 2)}um";
                RaisePropertyChanged();
            }
        }

        public override float MachineZ
        {
            get => ManifestFile.Machines.ZHeight > 0 ? ManifestFile.Machines.ZHeight : base.MachineZ;
            set
            {
                ManifestFile.Machines.ZHeight = value;
                RaisePropertyChanged();
            }
        }

        public override byte AntiAliasing
        {
            get => ManifestFile.Machines.AntiAliasing;
            set
            {
                ManifestFile.Machines.AntiAliasing = value.Clamp(1, 16);
                RaisePropertyChanged();
            }
        }

        public override float LayerHeight
        {
            get => ManifestFile.Slices.LayerHeight;
            set
            {
                ManifestFile.Slices.LayerHeight = Layer.RoundHeight(value);
                RaisePropertyChanged();
            }
        }

        public override uint LayerCount
        {
            get => base.LayerCount;
            set => base.LayerCount = ManifestFile.Slices.LayerCount = base.LayerCount;
        }

        
        public override object[] Configs => new object[] { 
            ManifestFile.FileInfo.Version,
            ManifestFile.FileInfo.Written, 
            ManifestFile.Machines, 
            ManifestFile.Slices };

        #endregion

        #region Constructor
        public VDAFile()
        { }
        #endregion

        #region Methods

        protected override void EncodeInternally(string fileFullPath, OperationProgress progress)
        {
            using var outputFile = ZipFile.Open(fileFullPath, ZipArchiveMode.Create);
            var manifestFilename = Path.GetFileName(fileFullPath).
                Replace($".{FileExtensions[0].Extension}{TemporaryFileAppend}", ".xml").
                Replace($".{FileExtensions[0].Extension}", ".xml");

            for (uint layerIndex = 0; layerIndex < LayerCount; layerIndex++)
            {
                progress.Token.ThrowIfCancellationRequested();
                var layer = this[layerIndex];
                var filename = $"{layerIndex + 1}".PadLeft(4, '0') + ".png";
                outputFile.PutFileContent(filename, layer.CompressedBytes, ZipArchiveMode.Create);
                progress++;
            }

            UpdateManifest();

            XmlSerializer serializer = new(ManifestFile.GetType());
            XmlSerializerNamespaces ns = new();
            ns.Add("", "");
            var entry = outputFile.CreateEntry(manifestFilename);
            using var stream = entry.Open();
            serializer.Serialize(stream, ManifestFile, ns);
        }

        protected override void DecodeInternally(string fileFullPath, OperationProgress progress)
        {
            using (var inputFile = ZipFile.Open(FileFullPath, ZipArchiveMode.Read))
            {
                var entry = inputFile.Entries.FirstOrDefault(zipEntry => zipEntry.Name.EndsWith(".xml"));
                if (entry is null)
                {
                    Clear();
                    throw new FileLoadException($".xml manifest not found", fileFullPath);
                }

                try
                {
                    var serializer = new XmlSerializer(ManifestFile.GetType());
                    using var stream = entry.Open();
                    ManifestFile = (VDARoot)serializer.Deserialize(stream);
                }
                catch (Exception e)
                {
                    Clear();
                    throw new FileLoadException($"Unable to deserialize '{entry.Name}'\n{e}", fileFullPath);
                }


                LayerManager.Init(ManifestFile.Slices.LayerCount);
                progress.Reset(OperationProgress.StatusDecodeLayers, LayerCount);


                for (uint layerIndex = 0; layerIndex < LayerCount; layerIndex++)
                {
                    if (progress.Token.IsCancellationRequested) break;
                    var filename = $"{layerIndex + 1}".PadLeft(4, '0')+".png";
                    entry = inputFile.GetEntry(filename);
                    if (entry is null)
                    {
                        Clear();
                        throw new FileLoadException($"Layer {filename} not found", fileFullPath);
                    }

                    using var stream = entry.Open();
                    this[layerIndex] = new Layer(layerIndex, stream, LayerManager);

                    progress++;
                }
            }

            LayerManager.GetBoundingRectangle(progress);
        }

        public override void SaveAs(string filePath = null, OperationProgress progress = null)
        {
            if (RequireFullEncode)
            {
                if (!string.IsNullOrEmpty(filePath))
                {
                    FileFullPath = filePath;
                }
                Encode(FileFullPath, progress);
                return;
            }

            if (!string.IsNullOrEmpty(filePath))
            {
                File.Copy(FileFullPath, filePath, true);
                FileFullPath = filePath;
            }

            using var outputFile = ZipFile.Open(FileFullPath, ZipArchiveMode.Update);
            bool deleted;

            do
            {
                deleted = false;
                foreach (var zipEntry in outputFile.Entries)
                {
                    if (!zipEntry.Name.EndsWith(".xml")) continue;
                    zipEntry.Delete();
                    deleted = true;
                    break;
                }
            } while (deleted);

            var manifestFilename = Path.GetFileName(FileFullPath).
                Replace($".{FileExtensions[0].Extension}{TemporaryFileAppend}", ".xml").
                Replace($".{FileExtensions[0].Extension}", ".xml");

            UpdateManifest();

            XmlSerializer serializer = new(ManifestFile.GetType());
            XmlSerializerNamespaces ns = new();
            ns.Add("", "");
            var entry = outputFile.CreateEntry(manifestFilename);
            using var stream = entry.Open();
            serializer.Serialize(stream, ManifestFile, ns);
        }

        public void UpdateManifest()
        {
            ManifestFile.FileInfo.Written.Reset();
            ManifestFile.Slices.StartHeight = FirstLayer.PositionZ;
            ManifestFile.Slices.EndHeight = LastLayer.PositionZ;
            ManifestFile.Layers.Clear();
            for (uint layerIndex = 0; layerIndex < LayerCount; layerIndex++)
            {
                var layer = this[layerIndex];
                ManifestFile.Layers.Add(new VDARoot.VDALayer(layerIndex, layer.PositionZ, layer.FormatFileName(4, false)));
            }
        }
        #endregion
    }
}