using System.ComponentModel;
using System.ComponentModel.Composition;
using System.Threading.Tasks;
using DTS.Common.Events;
using DTS.Common.Interface;
using Prism.Events;
using Prism.Regions;
using Unity;
using DTS.Common.Utils;
using System.Text;
using DTS.Common.Interactivity;
using Prism.Commands;

// ReSharper disable CheckNamespace
// ReSharper disable MemberCanBePrivate.Global
// ReSharper disable InconsistentNaming

namespace DBImportExport
{
    /// <summary>
    /// this class handles DB import/export functionality
    /// (note that since a lot of of DataPRO objects still live in the datapro project it's functionality is limited to the xml string going back and forth right now)
    /// </summary>
    [Export(typeof(IDBImportView))]
    [Export(typeof(IDBExportView))]
    [PartCreationPolicy(CreationPolicy.Shared)]
    public class DBViewModel : IDBViewModel
    {
        /// <summary>
        /// the import view
        /// </summary>
        public IDBImportView ImportView { get; set; }
        /// <summary>
        /// the export view
        /// </summary>
        public IDBExportView ExportView { get; set; }

        private IEventAggregator _eventAggregator { get; set; }
        private IRegionManager _regionManager;
        private IUnityContainer UnityContainer { get; set; }

        public InteractionRequest<Notification> NotificationRequest { get; private set; }
        public InteractionRequest<Confirmation> ConfirmationRequest { get; private set; }

        /// <summary>
        /// Creates a new instance of the TechnologyDomainEditViewModel.
        /// </summary>
        /// <param name="view">The Power And Battery View.</param>
        /// <param name="regionManager">The logical placeholder defined within the application's UI (in the shell or within views) into which views are displayed.</param>
        /// <param name="eventAggregator">The EventAggregator which allows different components to publish/subscribe to events without being coupled to each other.</param>
        /// <param name="unityContainer">The unityContainer.</param>
        public DBViewModel(IDBImportView importView, IDBExportView exportView, IRegionManager regionManager, IEventAggregator eventAggregator, IUnityContainer unityContainer)
        {
            ImportView = importView;
            ImportView.DataContext = this;

            ExportView = exportView;
            ExportView.DataContext = this;

            NotificationRequest = new InteractionRequest<Notification>();
            ConfirmationRequest = new InteractionRequest<Confirmation>();

            _eventAggregator = eventAggregator;
            UnityContainer = unityContainer;
            _regionManager = regionManager;
            _eventAggregator.GetEvent<RaiseNotification>().Subscribe(OnRaiseNotification);
            _eventAggregator.GetEvent<BusyIndicatorChangeNotification>().Subscribe(OnBusyIndicatorNotification, ThreadOption.PublisherThread, true);
        }

        #region Methods

        public void Cleanup() { }
        public Task CleanupAsync() { return Task.CompletedTask; }
        public void Initialize() { }
        public void Initialize(object parameter) { }
        public void Initialize(object parameter, object model) { }
        public Task InitializeAsync() { return Task.CompletedTask; }
        public Task InitializeAsync(object parameter) { return Task.CompletedTask; }
        public void Activated() { }

        /// <summary>
        /// Private Event handler for RaiseNotification event.
        /// </summary>
        private void OnBusyIndicatorNotification(bool eventArg) { IsBusy = eventArg; }

        /// <summary>
        /// Private Event handler for RaiseNotification event.
        /// </summary>
        private void OnRaiseNotification(NotificationContentEventArgs eventArgsWithTitle)
        {
            // The NotificationRequest.Raise triggers the Invoke() method of the PopupWindowAction object to show the NotificationWindow window
            // Notification object expects a NotificationContentEventArgsWithoutTitle object and a Title string.
            var eventArgsWithoutTitle = new NotificationContentEventArgs(eventArgsWithTitle.Message, "", eventArgsWithTitle.Image, string.Empty);

            NotificationRequest.Raise(new Notification { Content = eventArgsWithoutTitle, Title = eventArgsWithTitle.Title });
        }
        /// <summary>
        /// exports ExportData to ExportFileName
        /// </summary>
        public void Export()
        {
            //System.IO.File.WriteAllText(_exportFile, sb.ToString(), Encoding.Unicode);
            if (string.IsNullOrWhiteSpace(ExportFileName))
            {
                _eventAggregator.GetEvent<ShowStatus>()
                    .Publish(new StatusInfo(StatusInfo.StatusState.DoneFailed,
                        Resources.StringResources.ExportFileName_Empty));
                return;
            }
            if (string.IsNullOrWhiteSpace(ExportData))
            {
                _eventAggregator.GetEvent<ShowStatus>().Publish(new StatusInfo(StatusInfo.StatusState.DoneFailed,
                    Resources.StringResources.ExportFileData_Empty));
                return;
            }
            if (System.IO.File.Exists(ExportFileName))
            {
                FileUtils.DeleteFileOrMove(ExportFileName, LogDummyFunc);
            }
            System.IO.File.WriteAllText(ExportFileName, ExportData, Encoding.Unicode);
        }

        private void LogDummyFunc(params object[] paramlist)
        {
            return;
        }
        #endregion

        #region Properties
        public bool IsDirty { get; private set; }
        private bool _isBusy = false;
        public bool IsBusy { get => _isBusy; set { _isBusy = value; OnPropertyChanged("IsBusy"); } }
        private bool _isMenuIncluded = false;
        public bool IsMenuIncluded { get => _isMenuIncluded; set { _isMenuIncluded = value; OnPropertyChanged("IsMenuIncluded"); } }
        private bool _isNavigationIncluded = false;
        public bool IsNavigationIncluded { get => _isNavigationIncluded; set { _isNavigationIncluded = value; OnPropertyChanged("IsNavigationIncluded"); } }
        /// <summary>
        /// Gets the HeaderInfo.
        /// </summary>
        public string HeaderInfo => "MainRegion";
        /// <summary>
        /// xml string containing all data imported
        /// </summary>
        public string ImportData { get; set; }
        /// <summary>
        /// xml string containing all data  exported
        /// </summary>
        public string ExportData { get; set; }
        /// <summary>
        /// exports ExportData to the ExportFileName
        /// </summary>
        #endregion Properties

        #region Commands
        /// <summary>
        /// browse to a file to import, should be xml, maybe needs a few other criteria
        /// </summary>
        private DelegateCommand _importBrowseCommand;
        public DelegateCommand ImportBrowseCommand => _importBrowseCommand ?? (_importBrowseCommand = new DelegateCommand(ImportBrowseMethod));
        private void ImportBrowseMethod()
        {
            using (var dlg = new System.Windows.Forms.OpenFileDialog())
            {
                dlg.CheckFileExists = true;
                dlg.CheckPathExists = true;
                dlg.Filter = Resources.StringResources.ImportFileBrowse_Filter;
                dlg.FilterIndex = 0;

                if (dlg.ShowDialog() == System.Windows.Forms.DialogResult.OK)
                {
                    ImportFileName = dlg.FileName;
                    ImportStatusText = "Pressing the Import button will delete your existing database and replace it using " + ImportFileName;
                }
            }
        }
        /// <summary>
        /// browse to a file to import, should be xml, maybe needs a few other criteria
        /// </summary>
        private DelegateCommand _exportBrowseCommand;
        public DelegateCommand ExportBrowseCommand => _exportBrowseCommand ?? (_exportBrowseCommand = new DelegateCommand(ExportBrowseMethod));
        private void ExportBrowseMethod()
        {
            using (var dlg = new System.Windows.Forms.SaveFileDialog())
            {
                dlg.CheckFileExists = false;
                dlg.CheckPathExists = true;
                dlg.OverwritePrompt = false;
                dlg.Filter = Resources.StringResources.ExportFileBrowse_Filter;
                dlg.FilterIndex = 0;

                if (dlg.ShowDialog() == System.Windows.Forms.DialogResult.OK)
                {
                    ExportFileName = dlg.FileName;
                }
            }
        }
        #endregion

        #region properties

        /// <summary>
        /// all properties that are exposed
        /// </summary>
        public enum PropertyNames
        {
            ExportFileName,
            ImportFileName,
            ImportStatusText
        }
        private string _exportFileName = "";
        /// <summary>
        /// full path to export file
        /// </summary>
        public string ExportFileName
        {
            get => _exportFileName;
            set
            {
                _exportFileName = value;
                OnPropertyChanged(PropertyNames.ExportFileName.ToString());
            }
        }

        private string _importFileName = "";
        /// <summary>
        /// full path to import file
        /// </summary>
        public string ImportFileName
        {
            get => _importFileName;
            set
            {
                _importFileName = value;
                OnPropertyChanged(PropertyNames.ImportFileName.ToString());
            }
        }
        private string _importStatusText;
        public string ImportStatusText
        {
            get => _importStatusText;
            set
            {
                _importStatusText = value;
                OnPropertyChanged(PropertyNames.ImportStatusText.ToString());
            }
        }

        #endregion

        ///<summary>
        ///Occurs when a property value changes.
        ///</summary>
        public event PropertyChangedEventHandler PropertyChanged;
        public void OnPropertyChanged(string propertyName)
        {
            var eventHandler = PropertyChanged;
            if (eventHandler != null) { eventHandler(this, new PropertyChangedEventArgs(propertyName)); }
        }
    }
}