using System;
using System.Windows.Controls;

using DevExpress.Xpf.Scheduler;
using DevExpress.Xpf.Scheduler.Drawing;
using DevExpress.XtraScheduler;
using DevExpress.Xpf.Scheduler.UI;
using SchedulerControl = DevExpress.Xpf.Scheduler.SchedulerControl;

using System.Globalization;
using System.Windows;
using System.Windows.Media;

namespace BeWo.Scheduler.View
{
    public class AbstractAppointmentEditForm : UserControl
    {
	    public AbstractAppointmentEditForm() { }
        
        public AbstractAppointmentEditForm(SchedulerControl schedulerControl, Appointment appointment)
        {
            Control = schedulerControl;
            Appointment = appointment;

            Controller = CreateFormController(Control, Appointment);
            RecurrenceVisualController = new RecurrenceVisualController(Controller);
        }

        public virtual AppointmentFormController CreateFormController(SchedulerControl schedulerControl, Appointment appointment)
        {
            return new AppointmentFormController(schedulerControl, appointment);
        }

        public SchedulerControl Control { get; }

	    public Appointment Appointment { get; }

	    public AppointmentFormController Controller { get; }

	    public string TimeEditMask => CultureInfo.CurrentCulture.DateTimeFormat.LongTimePattern;
	    public RecurrenceVisualController RecurrenceVisualController { get; }

	    protected internal bool IsNewAppointment => Controller is null || Controller.IsNewAppointment;

	    protected bool ShouldShowRecurrence => !Appointment.IsOccurrence && Controller.ShouldShowRecurrenceButton;

	    protected virtual bool ApplyChanges()
        {
            if (!Controller.IsConflictResolved())
            {
                return false;
            }

            // TODO: Endzeit und Startzeit werden als Dauer auf das Start-Objekt addiert
            if (ShouldShowRecurrence)
            {
                var rvcStart = RecurrenceVisualController.Start;
                
                RecurrenceVisualController.ApplyRecurrence();
            }

            try
            {
                Controller.ApplyChanges();
            }
            catch (Exception e)
            {
	            MessageBox.Show($"Es ist leider ein Fehler aufgetreten. Die von Ihnen getätigten Änderungen am Termin konnten leider nicht übernommen werden.\n{e.Message}\n{e.StackTrace}", "Fehler", MessageBoxButton.OK, MessageBoxImage.Error);
            }

            SchedulerFormBehavior.Close(this, true);

            return true;
        }
        
        protected virtual void Cancel()
        {
            SchedulerFormBehavior.Close(this, false);
        }

        protected virtual void DeleteAppointment()
        {
            if (IsNewAppointment)
            {
	            return;
            }

            Controller.DeleteAppointment();
            SchedulerFormBehavior.Close(this, false);
        }

        protected static void LocalizeVisualChild(DependencyObject obj)
        {
            for (var i = 0; i < VisualTreeHelper.GetChildrenCount(obj); i++)
            {
                var child = VisualTreeHelper.GetChild(obj, i);
                if (child is WeekOfMonthEdit edt1)
                {
                    edt1.CustomDisplayText -= EditCustomDisplayText;
                    edt1.CustomDisplayText += EditCustomDisplayText;

                    foreach (var womEditItem in edt1.Items)
                    {
                        if (womEditItem is NamedElement ne)
                        {
	                        ne.Caption = Translate(ne.Caption);
                        }
                    }
                }

                if (child is WeekDaysEdit edt)
                {
                    edt.CustomDisplayText -= EditCustomDisplayText;
                    edt.CustomDisplayText += EditCustomDisplayText;

                    foreach (var womEditItem in edt.Items)
                    {
                        if (womEditItem is NamedElement ne)
                        {
	                        ne.Caption = Translate(ne.Caption);
                        }
                    }
                }

                LocalizeVisualChild(child);
            }
        }

	    private static void EditCustomDisplayText(object sender, DevExpress.Xpf.Editors.CustomDisplayTextEventArgs e)
        {
            e.DisplayText = Translate(e.DisplayText);
            e.Handled = true;
        }

        private static string Translate(string text)
        {
            switch (text)
            {
                case "First":
                    return "Ersten";
                case "Second":
                    return "Zweiten";
                case "Third":
                    return "Dritten";
                case "Fourth":
                    return "Vierten";
                case "Last":
                    return "Letzten";
                case "Day":
                    return "Tag";
                case "Weekday":
                    return "Arbeitstag";
                case "Weekend day":
                    return "Wochenendtag";
				default:
		            return text;
            }
        }
    }
}