using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.ComponentModel;
using System.IO;
using System.Linq;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Media.Imaging;
using System.Windows.Threading;
using Comal.Classes;
using InABox.Clients;
using InABox.Configuration;
using InABox.Core;
using InABox.DynamicGrid;
using InABox.WPF;
using Syncfusion.UI.Xaml.Grid;
using Syncfusion.UI.Xaml.TreeGrid;

namespace PRSDesktop
{
    public enum SVNFileStatus
    {
        Unknown,
        RemoteAddition,
        LocalAddition,
        RemoteModified,
        LocalModified,
        UpToDate
    }

    public class SVNObject : INotifyPropertyChanged
    {
        private static readonly Dictionary<SVNFileStatus, BitmapImage> _images = new()
        {
            { SVNFileStatus.Unknown, Resources.warning.AsBitmapImage() },
            { SVNFileStatus.UpToDate, Resources.tick.AsBitmapImage() },
            { SVNFileStatus.RemoteAddition, Resources.download.AsBitmapImage() },
            { SVNFileStatus.LocalAddition, Resources.upload.AsBitmapImage() },
            { SVNFileStatus.RemoteModified, Resources.remotefile.AsBitmapImage() },
            { SVNFileStatus.LocalModified, Resources.lightbulb.AsBitmapImage() }
        };

        private long _localsize;

        private DateTime _localtime = DateTime.MinValue;


        private readonly SVNObject _parent;

        private long _remotesize;

        private DateTime _remotetime = DateTime.MinValue;

        private SVNFileStatus _status = SVNFileStatus.Unknown;

        public SVNObject(string[] path, string name, SVNObject parent = null)
        {
            ID = Guid.NewGuid();
            _status = SVNFileStatus.Unknown;
            Path = path;
            Name = name;
            _parent = parent;
        }

        public SVNFileStatus Status
        {
            get => _status;
            set
            {
                _status = value;
                NotifyPropertyChanged("Status");
            }
        }

        public BitmapImage Image => _images[Status];

        public Guid ID { get; }

        public Guid ParentID => _parent != null ? _parent.ID : Guid.Empty;
        
        
        public string[] Path { get; }

        public string Name { get; }

        public long RemoteSize
        {
            get => _remotesize;
            set
            {
                _remotesize = value;
                Status = CheckStatus();
                NotifyPropertyChanged("RemoteSize");
            }
        }

        public DateTime RemoteTime
        {
            get => _remotetime;
            set
            {
                _remotetime = value;
                Status = CheckStatus();
                NotifyPropertyChanged("RemoteTime");
            }
        }

        public long LocalSize
        {
            get => _localsize;
            set
            {
                _localsize = value;
                Status = CheckStatus();
                NotifyPropertyChanged("LocalSize");
            }
        }

        public DateTime LocalTime
        {
            get => _localtime;
            set
            {
                _localtime = value;
                Status = CheckStatus();
                NotifyPropertyChanged("LocalTime");
            }
        }

        public string DisplayName => Uri.UnescapeDataString(Name).TrimEnd('/');

        public event PropertyChangedEventHandler PropertyChanged;

        public bool Equals(string[] segments)
        {
            if (segments.Length != Path.Length + 1)
                return false;
            for (var i = 0; i < Path.Length; i++)
                if (!string.Equals(Path[i], segments[i]))
                    return false;
            if (!string.Equals(Name, segments.Last()))
                return false;
            return true;
        }

        public override string ToString()
        {
            return string.Format("[{0}].[{1}]", string.Join("].[", Path), Name);
        }

        private SVNFileStatus CheckStatus()
        {
            if (_localtime.IsEmpty())
                return SVNFileStatus.RemoteAddition;
            if (_remotetime.IsEmpty())
                return SVNFileStatus.LocalAddition;
            if (_remotetime > _localtime)
                return SVNFileStatus.RemoteModified;
            if (_localtime > _remotetime)
                return SVNFileStatus.LocalModified;
            return SVNFileStatus.UpToDate;
        }

        public void NotifyPropertyChanged(string propName)
        {
            if (PropertyChanged != null)
                PropertyChanged(this, new PropertyChangedEventArgs(propName));
        }
    }

    public class SVNFolder : SVNObject
    {
        public SVNFolder(string[] path, string name, SVNObject parent = null) : base(path, name, parent)
        {
        }
    }

    public class SVNFile : SVNObject
    {
        public SVNFile(string[] path, string name, SVNObject parent = null) : base(path, name, parent)
        {
        }
    }

    public abstract class SyncEntry
    {
        public Uri Parent { get; set; }
        public Uri Path { get; set; }

        public long Size { get; set; }
        public DateTime Modified { get; set; }
    }

    public class LocalSyncEntry : SyncEntry
    {
    }

    public class RemoteSyncEntry : SyncEntry
    {
    }

    /// <summary>
    ///     Interaction logic for JobDocuments.xaml
    /// </summary>
    public partial class JobDocuments : UserControl, IPanel<Job>, IJobControl
    {
        private readonly ObservableCollection<SVNFile> _files = new();

        private readonly ObservableCollection<SVNFolder> _folders = new();
        private readonly string _localroot = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments), "test");

        private Uri _serverroot = new("https://MacOSW10/svn/test/");
        private WaitCursor _waitcursor;

        //private SvnClient svnclient = null;

        private readonly DispatcherTimer _waitcursortimer;
        private string jobnumber = "";

        private Guid lastjobid = Guid.Empty;
        private readonly BackgroundWorker localfiles;
        private readonly BackgroundWorker localfolders;
        private readonly BackgroundWorker remotefiles;
        private readonly BackgroundWorker remotefolders;

        private JobDocumentsScreenSettings settings;

        public JobDocuments()
        {
            InitializeComponent();
            remotefolders = new BackgroundWorker();
            remotefolders.WorkerReportsProgress = true;
            remotefolders.WorkerSupportsCancellation = false;
            //remotefolders.DoWork += RemoteFoldersRefresh;
            remotefolders.ProgressChanged += (o, e) => HandleProgress(e, _folders);

            localfolders = new BackgroundWorker();
            localfolders.WorkerReportsProgress = true;
            localfolders.WorkerSupportsCancellation = false;
            //localfolders.DoWork += LocalFoldersRefresh;
            localfolders.ProgressChanged += (o, e) => HandleProgress(e, _folders);

            remotefiles = new BackgroundWorker();
            remotefiles.WorkerReportsProgress = true;
            remotefiles.WorkerSupportsCancellation = false;
            //remotefiles.DoWork += RemoteFilesRefresh;
            remotefiles.ProgressChanged += (o, e) => HandleProgress(e, _files);

            localfiles = new BackgroundWorker();
            localfiles.WorkerReportsProgress = true;
            localfiles.WorkerSupportsCancellation = false;
            localfiles.DoWork += LocalFilesRefresh;
            localfiles.ProgressChanged += (o, e) => HandleProgress(e, _files);

            _waitcursortimer = new DispatcherTimer();
            _waitcursortimer.Interval = TimeSpan.FromMilliseconds(50F);
            _waitcursortimer.Tick += CheckWaitCursor;
            _waitcursortimer.IsEnabled = true;
        }

        public Guid ParentID { get; set; }
        
        public JobPanelSettings Settings { get; set; }
        
        public bool IsReady { get; set; }

        public event DataModelUpdateEvent OnUpdateDataModel;

        public void CreateToolbarButtons(IPanelHost host)
        {
        }

        public string SectionName => "Job Documents";

        public DataModel DataModel(Selection selection)
        {
            return new JobDetailsDataModel(new Filter<Job>(x => x.ID).IsEqualTo(ParentID));
        }

        public void Heartbeat(TimeSpan time)
        {
        }

        public void Refresh()
        {
            if (ParentID == Guid.Empty || ParentID == CoreUtils.FullGuid)
                return;

            // using (SvnClient svnClient = new SvnClient())
            // {
            //     svnClient.Authentication.Clear();
            //     svnClient.Authentication.DefaultCredentials = new System.Net.NetworkCredential("admin", "admin");
            //     svnClient.Authentication.SslServerTrustHandlers += (o, e) =>
            //     {
            //         e.AcceptedFailures = e.Failures;
            //         e.Save = true;
            //     };
            //
            //     //var statusArgs = new SvnStatusArgs();
            //     //statusArgs.Depth = SvnDepth.Infinity;
            //     //statusArgs.RetrieveAllEntries = true;
            //     //Collection<SvnStatusEventArgs> statuses;
            //     //bool bResult = svnClient.GetStatus(Path.Combine(_localroot, GetFolderPath("\\")), statusArgs, out statuses);
            //     //foreach (SvnStatusEventArgs statusEventArgs in statuses)
            //     //{
            //     //    if (statusEventArgs.LocalContentStatus == SvnStatus.Modified)
            //     //        System.Console.WriteLine("Modified file: " + statusEventArgs.Path);
            //     //}
            // }


            _folders.Clear();
            ;
            _files.Clear();
            CheckAndRunWorkers(remotefolders, localfolders, GetFolderPath("/"), GetFolderPath("\\"));
        }

        public Dictionary<string, object[]> Selected()
        {
            return new Dictionary<string, object[]>();
        }

        public void Setup()
        {
            settings = new UserConfiguration<JobDocumentsScreenSettings>().Load();
            SplitPanel.View = settings.ViewType == ScreenViewType.Register ? DynamicSplitPanelView.Master :
                settings.ViewType == ScreenViewType.Details ? DynamicSplitPanelView.Detail : DynamicSplitPanelView.Combined;
            SplitPanel.AnchorWidth = settings.AnchorWidth;

            Folders.ParentPropertyName = "ID";
            Folders.ChildPropertyName = "ParentID";
            Folders.SelfRelationRootValue = Guid.Empty;
            Folders.AutoExpandMode = AutoExpandMode.RootNodesExpanded;
            Folders.ItemsSource = _folders;

            Files.ItemsSource = _files;
        }

        public void Shutdown()
        {
        }

        private void SplitPanel_OnChanged(object sender, DynamicSplitPanelSettings e)
        {
            settings.ViewType = SplitPanel.View == DynamicSplitPanelView.Master ? ScreenViewType.Register :
                SplitPanel.View == DynamicSplitPanelView.Detail ? ScreenViewType.Details : ScreenViewType.Combined;
            settings.AnchorWidth = SplitPanel.AnchorWidth;
            new UserConfiguration<JobDocumentsScreenSettings>().Save(settings);
        }

        private void Folders_AutoGeneratingColumn(object sender, TreeGridAutoGeneratingColumnEventArgs e)
        {
            if (e.Column.MappingName == "DisplayName")
                e.Column.ColumnSizer = TreeColumnSizer.Star;
            else if (e.Column.MappingName.Equals("RemoteSize") || e.Column.MappingName.Equals("RemoteTime") ||
                     e.Column.MappingName.Equals("LocalSize") ||
                     e.Column.MappingName.Equals("LocalTime"))
                //e.Column.ColumnSizer = TreeColumnSizer.Auto;
                e.Cancel = true;
            else
                e.Cancel = true;
        }

        private void Folders_SizeChanged(object sender, SizeChangedEventArgs e)
        {
        }

        private void Folders_SelectionChanged(object sender, GridSelectionChangedEventArgs e)
        {
            _files.Clear();
            var folder = (e.AddedItems.FirstOrDefault() as TreeGridRowInfo)?.RowData as SVNFolder;
            if (folder != null)
                CheckAndRunWorkers(remotefiles, localfiles, folder, folder);
        }

        private void Files_AutoGeneratingColumn(object sender, AutoGeneratingColumnArgs e)
        {
            e.Column.HeaderStyle = Resources["FileHeaderStyle"] as Style;
            if (e.Column.MappingName == "Status")
            {
                e.Column = new GridTemplateColumn { CellTemplate = Resources["ImageTemplate"] as DataTemplate };
                e.Column.Width = 30;
            }
            else if (e.Column.MappingName == "DisplayName")
            {
                e.Column.ColumnSizer = GridLengthUnitType.Star;
                e.Column.HeaderText = "File Name";
            }
            else if (e.Column.MappingName.Equals("RemoteSize") || e.Column.MappingName.Equals("RemoteTime") ||
                     e.Column.MappingName.Equals("LocalSize") ||
                     e.Column.MappingName.Equals("LocalTime"))
                // e.Column.ColumnSizer = GridLengthUnitType.Auto;
            {
                e.Cancel = true;
            }
            else
            {
                e.Cancel = true;
            }
        }

        #region Background Worker Support Functions

        private void CheckWaitCursor(object sender, EventArgs args)
        {
            if (!remotefolders.IsBusy && !remotefiles.IsBusy && !localfolders.IsBusy && !localfiles.IsBusy)
            {
                _waitcursortimer.IsEnabled = false;
                if (_waitcursor != null)
                {
                    _waitcursor.Dispose();
                    _waitcursor = null;
                }
            }
        }

        private void CheckAndRunWorkers(BackgroundWorker remote, BackgroundWorker local, object remoteparameter, object localparameter)
        {
            if (remote.IsBusy)
            {
                MessageBox.Show(string.Format("{0} is Busy!", remote.GetType()));
                return;
            }

            if (localfiles.IsBusy)
            {
                MessageBox.Show(string.Format("{0} is Busy!", local.GetType()));
                return;
            }

            _waitcursor = new WaitCursor();
            remote.RunWorkerAsync(remoteparameter);
            local.RunWorkerAsync(localparameter);
            _waitcursortimer.IsEnabled = true;
        }

        private string GetFolderPath(string separator)
        {
            if (lastjobid != ParentID)
            {
                jobnumber = new Client<Job>().Query(
                    new Filter<Job>(x => x.ID).IsEqualTo(ParentID),
                    new Columns<Job>(x => x.JobNumber)
                ).Rows.Select(r => r.Get<Job, string>(c => c.JobNumber)).FirstOrDefault();
                lastjobid = ParentID;
            }

            return string.Join(separator, "Jobs", jobnumber);
        }

        private static Uri GetRelativeUri(string segment)
        {
            var sSeg = string.Format("./{0}/", segment.TrimStart('/').TrimEnd('/'));
            var uSeg = new Uri(sSeg, UriKind.Relative);
            return uSeg;
        }


        private void HandleProgress<T>(ProgressChangedEventArgs e, ObservableCollection<T> collection, Action<T, Uri> action = null)
            where T : SVNObject
        {
            if (e.UserState is Exception)
            {
                var err = e.UserState as Exception;
                var messages = new List<string>();
                messages.Add("===============================================");
                messages.Add(string.Format("{0} Exception Caught!", err.GetType()));
                while (err != null)
                {
                    messages.Add("===============================================");
                    messages.Add(err.Message);
                    messages.Add(err.StackTrace);
                    err = err.InnerException;
                }

                messages.Add("===============================================");
                MessageBox.Show(string.Join("\n", messages));
            }
            else if (e.UserState is SyncEntry)
            {
                UpdateCollection(e.UserState as SyncEntry, collection, action);
            }
        }

        private void UpdateCollection<T>(SyncEntry entry, ObservableCollection<T> items, Action<T, Uri> action) where T : SVNObject
        {
            if (entry == null)
                return;

            var segments = entry.Path.Segments.Skip(entry.Parent.Segments.Length)
                .Select(x => x.TrimStart('/').TrimEnd('/').TrimStart('\\').TrimEnd('\\'))
                .ToArray();
            if (!segments.Any())
                return;

            var path = segments.Reverse().Skip(1).Reverse().ToArray();
            var name = segments.LastOrDefault();

            var existing = items.FirstOrDefault(x => x.Equals(segments));
            if (existing == null)
            {
                var parent = items.FirstOrDefault(x => x.Equals(path));
                existing = Activator.CreateInstance(typeof(T), path, name, parent) as T;
                items.Add(existing);
            }

            if (entry is LocalSyncEntry)
            {
                existing.LocalSize = entry.Size;
                existing.LocalTime = entry.Modified;
            }
            else if (entry is RemoteSyncEntry)
            {
                existing.RemoteSize = entry.Size;
                existing.RemoteTime = entry.Modified;
            }
        }

        #endregion

        #region Local File Processing

        private void LocalFilesRefresh(object sender, DoWorkEventArgs args)
        {
            var folder = args.Argument as SVNFolder;
            if (folder == null)
                return;

            var root = Path.Combine(_localroot, GetFolderPath("\\"));
            foreach (var segment in folder.Path)
                root = Path.Combine(root, segment);
            root = Path.Combine(root, folder.Name);
            root = Uri.UnescapeDataString(root);

            if (!Directory.Exists(root))
                return;

            try
            {
                var files = Directory.EnumerateFiles(root);
                foreach (var file in files)
                {
                    var info = new FileInfo(file);
                    localfiles.ReportProgress(0,
                        new LocalSyncEntry { Parent = new Uri(root), Path = new Uri(file), Modified = info.LastWriteTime, Size = info.Length });
                }
            }
            catch (Exception e)
            {
                localfiles.ReportProgress(100, e);
            }
        }

        private void LocalFoldersRefresh(object sender, DoWorkEventArgs args)
        {
            var folderroot = args.Argument as string;
            if (string.IsNullOrWhiteSpace(folderroot))
                return;

            try
            {
                var root = Path.Combine(_localroot, folderroot.TrimStart('\\'));
                root = Uri.UnescapeDataString(root);

                var folders = new List<string> { root };
                while (folders.Any())
                {
                    var folder = folders.First();
                    folders.Remove(folder);
                    if (Directory.Exists(folder))
                    {
                        var items = Directory.EnumerateDirectories(folder);
                        foreach (var item in items)
                        {
                            var info = new FileInfo(item);
                            if (!string.IsNullOrEmpty(item) && !string.Equals(item, folder) && !string.Equals(item, root) &&
                                !info.Attributes.HasFlag(FileAttributes.Hidden))
                            {
                                folders.Add(item);
                                localfolders.ReportProgress(0,
                                    new LocalSyncEntry { Parent = new Uri(root), Path = new Uri(item), Modified = info.LastWriteTime, Size = 0L });
                            }
                        }
                    }
                }
            }
            catch (Exception e)
            {
                localfolders.ReportProgress(100, e);
            }
        }

        #endregion

        #region Remote File Processing

        // private static bool ListRemoteDirectory(SvnClient svnClient, Uri uri, out Collection<SvnListEventArgs> items, bool create)
        // {
        //     try
        //     {
        //         return svnClient.GetList(uri, out items);
        //     }
        //     catch
        //     {
        //         if (create)
        //         {
        //             svnClient.RemoteCreateDirectory(uri, new SvnCreateDirectoryArgs() { LogMessage = "Auto Created Folder" });
        //             return svnClient.GetList(uri, out items);
        //         }
        //         else
        //         {
        //             items = new Collection<SvnListEventArgs>();
        //             return false;
        //         }
        //     }
        // }

        // private void RemoteFilesRefresh(object sender, DoWorkEventArgs args)
        // {
        //
        //     var folder = args.Argument as SVNFolder;
        //     if (folder == null)
        //         return;
        //
        //     Uri uri = new Uri(_serverroot, GetRelativeUri(GetFolderPath("/")));
        //     foreach (var segment in folder.Path)
        //     {
        //         Uri uSeg = GetRelativeUri(segment);
        //         uri = new Uri(uri, uSeg);
        //     }
        //     uri = new Uri(uri, GetRelativeUri(folder.Name));
        //
        //     try
        //     {
        //         using (SvnClient svnClient = new SvnClient())
        //         {
        //             svnClient.Authentication.Clear();
        //             svnClient.Authentication.DefaultCredentials = new System.Net.NetworkCredential("admin", "admin");
        //             svnClient.Authentication.SslServerTrustHandlers += (o, e) =>
        //             {
        //                 e.AcceptedFailures = e.Failures;
        //                 e.Save = true;
        //             };
        //
        //             Collection<SvnListEventArgs> items;
        //             if (ListRemoteDirectory(svnClient, uri, out items, false))
        //             {
        //                 foreach (SvnListEventArgs item in items)
        //                 {
        //                     bool bInfo = svnClient.GetInfo(item.Uri, out SvnInfoEventArgs info);
        //
        //                     if ((!String.IsNullOrEmpty(item.Name)) && (item.Entry.NodeKind == SvnNodeKind.File))
        //                     {
        //                         //bool bStatus = svnClient.GetStatus(item.Uri.AbsoluteUri, out Collection<SvnStatusEventArgs> statuses);
        //                         remotefiles.ReportProgress(0, new RemoteSyncEntry() { Parent = uri, Path = item.Uri, Modified = item.Entry.Time, Size = info.RepositorySize });
        //                     }
        //                 }
        //             }
        //         }
        //     }
        //     catch (Exception e)
        //     {
        //         remotefiles.ReportProgress(100, e);
        //     }
        // }
        //
        // private void RemoteFoldersRefresh(object sender, DoWorkEventArgs args)
        // {
        //
        //     String folderroot = args.Argument as String;
        //     if (String.IsNullOrWhiteSpace(folderroot))
        //         return;
        //
        //     try
        //     {
        //         using (SvnClient svnClient = new SvnClient())
        //         {
        //             svnClient.Authentication.Clear();
        //             svnClient.Authentication.DefaultCredentials = new System.Net.NetworkCredential("admin", "admin");
        //             svnClient.Authentication.SslServerTrustHandlers += (o,e) =>
        //             {
        //                 e.AcceptedFailures = e.Failures;
        //                 e.Save = true; 
        //             };
        //
        //             Uri root = new Uri(_serverroot, GetRelativeUri(folderroot));
        //             List<Uri> uris = new List<Uri>() { root };
        //             while (uris.Any())
        //             {
        //                 var uri = uris.First();
        //                 uris.Remove(uri);
        //                 Collection<SvnListEventArgs> items;
        //                 if (ListRemoteDirectory(svnClient, uri, out items, true))
        //                 {
        //                     foreach (SvnListEventArgs item in items)
        //                     {
        //                         if ((!String.IsNullOrEmpty(item.Name)) && (!Uri.Equals(root, item.Uri)) && (!Uri.Equals(uri, item.Uri)) && (item.Entry.NodeKind == SvnNodeKind.Directory))
        //                         {
        //                             uris.Add(item.Uri);
        //                             remotefolders.ReportProgress(0, new RemoteSyncEntry() { Parent = root, Path = item.Uri, Modified = item.Entry.Time, Size = item.Entry.FileSize });
        //                         }
        //                     }
        //                 }
        //             }
        //         }
        //     }
        //     catch (Exception e)
        //     {
        //         remotefolders.ReportProgress(100, e);
        //     }
        // }

        #endregion
    }
}