Single isntances and some updates shit.

Wino.Calendar.ViewModels/Data/CalendarItemViewModel.cs

@@ -2,8 +2,10 @@
 using System.Collections.ObjectModel;
 using CommunityToolkit.Mvvm.ComponentModel;
 using Itenso.TimePeriod;
+using Wino.Core.Domain;
 using Wino.Core.Domain.Entities.Calendar;
 using Wino.Core.Domain.Interfaces;
+using Wino.Core.Domain.Models.Calendar;
 
 namespace Wino.Calendar.ViewModels.Data;
 
@@ -89,6 +91,35 @@ public partial class CalendarItemViewModel : ObservableObject, ICalendarItem, IC
     [ObservableProperty]
     public partial bool IsSelected { get; set; }
 
+    /// <summary>
+    /// The period of the day where this item is currently being displayed.
+    /// Used for multi-day event title formatting.
+    /// </summary>
+    [ObservableProperty]
+    [NotifyPropertyChangedFor(nameof(DisplayTitle))]
+    public partial ITimePeriod DisplayingPeriod { get; set; }
+
+    /// <summary>
+    /// Calendar settings for time formatting.
+    /// </summary>
+    [ObservableProperty]
+    [NotifyPropertyChangedFor(nameof(DisplayTitle))]
+    public partial CalendarSettings CalendarSettings { get; set; }
+
+    /// <summary>
+    /// Gets the display title based on the current displaying period.
+    /// </summary>
+    public string DisplayTitle
+    {
+        get
+        {
+            if (DisplayingPeriod == null || CalendarSettings == null)
+                return Title;
+
+            return GetDisplayTitle(DisplayingPeriod, CalendarSettings);
+        }
+    }
+
     public ObservableCollection<CalendarEventAttendee> Attendees { get; } = new ObservableCollection<CalendarEventAttendee>();
 
     public CalendarItemViewModel(CalendarItem calendarItem)
@@ -96,5 +127,82 @@ public partial class CalendarItemViewModel : ObservableObject, ICalendarItem, IC
         CalendarItem = calendarItem;
     }
 
+    /// <summary>
+    /// Updates the underlying CalendarItem with new data and raises property change notifications.
+    /// </summary>
+    /// <param name="calendarItem">The updated calendar item data.</param>
+    public void UpdateFrom(CalendarItem calendarItem)
+    {
+        if (calendarItem == null || calendarItem.Id != CalendarItem.Id)
+            return;
+
+        // Update all mutable properties
+        CalendarItem.Title = calendarItem.Title;
+        CalendarItem.Description = calendarItem.Description;
+        CalendarItem.Location = calendarItem.Location;
+        CalendarItem.StartDate = calendarItem.StartDate;
+        CalendarItem.StartTimeZone = calendarItem.StartTimeZone;
+        CalendarItem.EndTimeZone = calendarItem.EndTimeZone;
+        CalendarItem.DurationInSeconds = calendarItem.DurationInSeconds;
+        CalendarItem.Recurrence = calendarItem.Recurrence;
+        CalendarItem.RecurringCalendarItemId = calendarItem.RecurringCalendarItemId;
+        CalendarItem.OrganizerDisplayName = calendarItem.OrganizerDisplayName;
+        CalendarItem.OrganizerEmail = calendarItem.OrganizerEmail;
+        CalendarItem.IsLocked = calendarItem.IsLocked;
+        CalendarItem.IsHidden = calendarItem.IsHidden;
+        CalendarItem.CustomEventColorHex = calendarItem.CustomEventColorHex;
+        CalendarItem.HtmlLink = calendarItem.HtmlLink;
+        CalendarItem.Status = calendarItem.Status;
+        CalendarItem.Visibility = calendarItem.Visibility;
+        CalendarItem.ShowAs = calendarItem.ShowAs;
+        CalendarItem.UpdatedAt = calendarItem.UpdatedAt;
+        CalendarItem.AssignedCalendar = calendarItem.AssignedCalendar;
+
+        // Raise property changed for all bindable properties
+        OnPropertyChanged(nameof(Title));
+        OnPropertyChanged(nameof(StartDate));
+        OnPropertyChanged(nameof(EndDate));
+        OnPropertyChanged(nameof(DurationInSeconds));
+        OnPropertyChanged(nameof(Period));
+        OnPropertyChanged(nameof(IsAllDayEvent));
+        OnPropertyChanged(nameof(IsMultiDayEvent));
+        OnPropertyChanged(nameof(IsRecurringEvent));
+        OnPropertyChanged(nameof(IsRecurringChild));
+        OnPropertyChanged(nameof(IsRecurringParent));
+        OnPropertyChanged(nameof(AssignedCalendar));
+        OnPropertyChanged(nameof(DisplayTitle));
+    }
+
+    /// <summary>
+    /// Gets the display title for this calendar item when rendered in a specific day.
+    /// </summary>
+    public string GetDisplayTitle(ITimePeriod displayingPeriod, CalendarSettings calendarSettings)
+    {
+        if (!IsMultiDayEvent)
+            return Title;
+
+        var periodRelation = Period.GetRelation(displayingPeriod);
+
+        if (periodRelation == PeriodRelation.StartInside || periodRelation == PeriodRelation.EnclosingStartTouching)
+        {
+            // Event starts within this day: "HH:mm -> Title"
+            return $"{calendarSettings.GetTimeString(StartDate.TimeOfDay)} -> {Title}";
+        }
+        else if (periodRelation == PeriodRelation.EndInside || periodRelation == PeriodRelation.EnclosingEndTouching)
+        {
+            // Event ends within this day: "Title <- HH:mm"
+            return $"{Title} <- {calendarSettings.GetTimeString(EndDate.TimeOfDay)}";
+        }
+        else if (periodRelation == PeriodRelation.Enclosing)
+        {
+            // Event spans the entire day
+            return $"{Translator.CalendarItemAllDay} {Title}";
+        }
+        else
+        {
+            return Title;
+        }
+    }
+
     public override string ToString() => CalendarItem.Title;
 }