using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.IO;
using System.Linq;
using System.Security.Authentication;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Windows;
using Tango.BL.Entities;
using Tango.Core.DI;
using Tango.Core.ExtensionMethods;
using Tango.Core.Helpers;
using Tango.Core.IO;
using Tango.Integration.Operation;
using Tango.Logging;
using Tango.MachineStudio.Common;
using Tango.MachineStudio.Common.Authentication;
using Tango.MachineStudio.Common.StudioApplication;
using Tango.Settings;
using Tango.SharedUI.Helpers;
using Tango.TFS;

namespace Tango.MachineStudio.UI.TFS
{
    public class TeamFoundationServiceExtendedClient : TeamFoundationServiceClient
    {
        private TemporaryFolder _tempFolder;
        private String user_email;

        public Project Project { get; private set; }

        private ObservableCollection<WorkItem> _resolvedWorkItems;
        public ObservableCollection<WorkItem> ResolvedWorkItems
        {
            get { return _resolvedWorkItems; }
            set { _resolvedWorkItems = value; RaisePropertyChangedAuto(); }
        }

        private bool _isInitialized;
        public bool IsInitialized
        {
            get { return _isInitialized; }
            private set { _isInitialized = value; RaisePropertyChangedAuto(); }
        }

        public TeamFoundationServiceExtendedClient(string collectionURL, string userName, string personalToken) : base(collectionURL, userName, personalToken)
        {
            _tempFolder = TemporaryManager.CreateFolder();

            ResolvedWorkItems = new ObservableCollection<WorkItem>();
            TangoIOC.Default.GetInstance<IAuthenticationProvider>().CurrentUserChanged += TeamFoundationServiceExtendedClient_CurrentUserChanged;
        }

        private void TeamFoundationServiceExtendedClient_CurrentUserChanged(object sender, User user)
        {
            if (user != null)
            {
                user_email = user.Email;

                Task.Factory.StartNew(async () =>
                {
                    Thread.Sleep(5000);
                    await UpdateCurrentUserResolvedWorkItems();
                });
            }
        }

        public Task<WorkItem> UploadWorkItem(WorkItem workItem)
        {
            return UploadWorkItem(Project, workItem);
        }

        public async Task UpdateCurrentUserResolvedWorkItems()
        {
            try
            {
                if (Project != null)
                {
                    IStudioApplicationManager app = TangoIOC.Default.GetInstance<IStudioApplicationManager>();
                    var member = GetUserTeamMember();

                    if (member != null)
                    {
                        var items = await GetWorkItemsCreatedBy(Project, member);
                        items.Where(x => x.StepsToReproduce != null).ToList().ForEach(x => x.StepsToReproduce = x.StepsToReproduce.Replace("<div style=\"white-space:pre;\">", "").Replace("</div>", ""));
                        ResolvedWorkItems = items.Where(x => x.State == State.Resolved && x.ResolvedReason == ResolvedReason.Fixed && x.IsBuildVersionValid && x.FoundInBuildVersion < app.Version).ToObservableCollection();
                    }
                    else
                    {
                        LogManager.Default.Log($"User '{user_email}' is not part of the VSTS team.", LogCategory.Warning);
                    }
                }
            }
            catch (Exception ex)
            {
                LogManager.Log(ex, "Error getting the current user resolved work items.");
            }
        }

        public async Task<WorkItem> CloseWorkItem(WorkItem workItem)
        {
            await SetWorkItemState(Project, workItem, State.Closed);
            var updated = await AddWorkItemComment(Project, workItem, GetUserTeamMember(), "Bug has been verified and closed by " + GetUserTeamMember().DisplayName + " (via Machine Studio).");
            ResolvedWorkItems.Remove(workItem);
            return updated;
        }

        public async Task<WorkItem> ReactivateWorkItem(WorkItem workItem)
        {
            await SetWorkItemState(Project, workItem, State.New);
            var updated = await AddWorkItemComment(Project, workItem, GetUserTeamMember(), "Bug has been reactivated by " + GetUserTeamMember().DisplayName + " (via Machine Studio).");
            updated = await SetWorkItemAssignment(Project, updated, workItem.ResolvedBy);
            ResolvedWorkItems.Remove(workItem);
            return updated;
        }

        public void Initialize()
        {
            Task.Factory.StartNew(() =>
            {
                if (!IsInitialized)
                {
                    try
                    {
                        Project = GetProject("Tango").Result;
                        IsInitialized = true;
                    }
                    catch (Exception ex)
                    {
                        LogManager.Log(ex, "Error initializing the Team Foundation Service client.");
                    }
                }
            });
        }

        public WorkItem CreateBug()
        {
            WorkItem item = new WorkItem();

            IAuthenticationProvider auth = TangoIOC.Default.GetInstance<IAuthenticationProvider>();
            IStudioApplicationManager app = TangoIOC.Default.GetInstance<IStudioApplicationManager>();

            item.Area = Project.Areas.FirstOrDefault();
            item.Iteration = Project.Iterations.FirstOrDefault();

            TeamMember currentUser = GetUserTeamMember();

            if (currentUser == null)
            {
                throw LogManager.Default.Log(new AuthenticationException($"User '{user_email}' is not part of the Tango VSTS team. Please contact your administrator."));
            }

            item.CreatedBy = currentUser;
            item.ChangedBy = currentUser;
            item.AuthorizedAs = currentUser;

            item.FoundInBuild = app.Version.ToString();
            item.Priority = Priority.Priority3;
            item.Severity = Severity.Medium;
            item.State = State.New;
            item.Type = WorkItemType.Bug;
            item.Environment = SettingsManager.Default.GetOrCreate<MachineStudioSettings>().DeploymentSlot.ToDescription();

            foreach (var window in Application.Current.Windows.OfType<Window>().Where(x => !String.IsNullOrWhiteSpace(x.Title)))
            {
                var bitmap = UIHelper.TakeSnapshot(window);

                if (!_tempFolder.Exists())
                {
                    _tempFolder = TemporaryManager.CreateFolder();
                }

                var tempFile = _tempFolder.CreateFile();
                bitmap.SaveJpeg(tempFile.Path, 30);

                String title = window.Title;

                item.Attachments.Add(new Attachment()
                {
                    Description = title + " Screen Capture",
                    FilePath = tempFile.Path,
                    Name = $"{title}.jpg",
                });
            }

            return item;
        }

        private string[] GetLogFiles(FileLogger logger)
        {
            string[] fileEntries = new string[1];
            fileEntries[0] = logger.LogFile;
            string fileName = Path.GetFileNameWithoutExtension(logger.LogFile);
            int indexPos = fileName.IndexOf(FileLogger.FILE_SET_EXTENSION);
            if (indexPos > 0)
            {
                string extension = Path.GetExtension(logger.LogFile);
                fileName = fileName.Substring(0, indexPos);
                fileEntries = Directory.GetFiles(logger.Folder, $"{fileName}*{extension}").Where(x => Path.GetFileName(x).StartsWith(logger.Tag)).OrderBy(x => x.Length).ThenBy(x => x).ToArray();
            }

            return fileEntries;
        }

        public void FinalizeBug(WorkItem item)
        {
            IAuthenticationProvider auth = TangoIOC.Default.GetInstance<IAuthenticationProvider>();
            IStudioApplicationManager app = TangoIOC.Default.GetInstance<IStudioApplicationManager>();

            FileLogger appFileLogger = LogManager.Default.RegisteredLoggers.FirstOrDefault(x => x.GetType() == typeof(FileLogger)) as FileLogger;
            FileLogger embeddedFileLogger = MachineOperator.EmbeddedLogManager.RegisteredLoggers.FirstOrDefault(x => x.GetType() == typeof(FileLogger)) as FileLogger;
            
            if (appFileLogger != null)
            {
                string[] logFiles = GetLogFiles(appFileLogger);
                foreach( string file  in logFiles)
                {
                    var appLogFile = _tempFolder.CreateImaginaryFile();
                    File.Copy(file, appLogFile.Path);
                    item.Attachments.Add(new Attachment()
                    {
                        Description = "Application Log File",
                        FilePath = appLogFile.Path,
                        Name = Path.GetFileName(file),
                    });
                }
            }

            if (embeddedFileLogger != null && File.Exists(embeddedFileLogger.LogFile))
            {
                string[] logFiles = GetLogFiles(embeddedFileLogger);
                foreach (string file in logFiles)
                {
                    var embeddedLogFile = _tempFolder.CreateImaginaryFile();
                    File.Copy(file, embeddedLogFile.Path);
                    item.Attachments.Add(new Attachment()
                    {
                        Description = "Embedded Log File",
                        FilePath = embeddedLogFile.Path,
                        Name = Path.GetFileName(file),
                    });
                }
            }

            //Add session log file..
            if (MachineOperator.EnableSessionLogFile)
            {
                var file = MachineOperator.SessionLogger.LogFile;

                if (file != null && File.Exists(file))
                {
                    var sessionLogFile = _tempFolder.CreateImaginaryFile();
                    File.Copy(file, sessionLogFile.Path);
                    item.Attachments.Add(new Attachment()
                    {
                        Description = "Session Log File",
                        FilePath = sessionLogFile.Path,
                        Name = Path.GetFileName(file),
                    });
                }
            }

            SystemInformationModel sysModel = new SystemInformationModel();
            sysModel.ApplicationVersion = app.Version.ToString();
            sysModel.EmbeddedVersion = "N/A";
            sysModel.HostName = Environment.MachineName;
            sysModel.UserName = auth.CurrentUser.Contact.FullName;

            if (app.ConnectedMachine != null)
            {
                Machine machine = app.Machine;

                sysModel.Machine = machine;
                sysModel.EmbeddedVersion = app.ConnectedMachine.DeviceInformation.Version;

                sysModel.ConfigurationString = machine.Configuration.Clone().ToJsonString();

                if (app.ConnectedMachine.CurrentProcessParameters != null)
                {
                    sysModel.LoadedProcessParametersString = app.ConnectedMachine.CurrentProcessParameters.ToJsonString(nameof(ProcessParametersTable.ProcessParametersTablesGroup));
                }

                if (app.ConnectedMachine.CurrentHardwareConfiguration != null)
                {
                    sysModel.LoadedHardwareConfigurationString = app.ConnectedMachine.CurrentHardwareConfiguration.ToJsonString();
                }
            }

            if (app.Machine != null && app.ConnectedMachine != null && app.ConnectedMachine.DeviceInformation != null)
            {
                item.EmbeddedVersion = app.ConnectedMachine.DeviceInformation.Version;
                item.MachineSerialNumber = app.Machine.SerialNumber;
            }

            String html = String.Empty;

            using (var stream = EmbeddedResourceHelper.GetEmbeddedResourceStream("Tango.MachineStudio.UI.TFS.SystemInformationTemplate.cshtml"))
            {
                StreamReader reader = new StreamReader(stream);
                html = reader.ReadToEnd();
            }

            item.SystemInformation = CodeGeneration.Helper.Parse(html, sysModel);

            item.StepsToReproduce = String.Format("<div style=\"white-space:pre\">{0}</div>", item.StepsToReproduce);
        }

        private TeamMember GetUserTeamMember()
        {
            IAuthenticationProvider auth = TangoIOC.Default.GetInstance<IAuthenticationProvider>();
            TeamMember currentUser = Project.Members.SingleOrDefault(x => x.UniqueName.ToLower().Contains(auth.CurrentUser.Email.ToLower()));
            return currentUser;
        }
    }
}