using System.ComponentModel.DataAnnotations; // Add this using directive

public class WeekPickerTestModel
{
    [Required(ErrorMessage = "Please select a week.")]
    public DateTime? SelectedWeek { get; set; } = null;

    public DateTime MinAllowedWeek { get; set; } = new DateTime(2023, 1, 1);
    public DateTime MaxAllowedWeek { get; set; } = new DateTime(2025, 12, 31);
}

private WeekPickerTestModel weekModel { get; set; } = new WeekPickerTestModel();

private void HandleValidSubmitWeek()
{
    Console.WriteLine($"Validation successful!");
    Console.WriteLine($"Selected week: {weekModel.SelectedWeek?.ToShortDateString()}");

    if (weekModel.SelectedWeek.HasValue)
    {
        var culture = CultureInfo.CurrentCulture;
        var weekNumber = culture.Calendar.GetWeekOfYear(
            weekModel.SelectedWeek.Value,
            culture.DateTimeFormat.CalendarWeekRule,
            culture.DateTimeFormat.FirstDayOfWeek
        );
        Console.WriteLine($"Week number according to {culture.Name}: {weekNumber}");
    }
}

/// Resets the selected week in the form example.
private void ResetWeekSelection()
{
    // Create a new instance of the model to reset all its properties and clear validation state
    weekModel = new WeekPickerTestModel();
    StateHasChanged(); // Force re-render to update UI
}

// No specific C# property needed for this example as it uses DateTime.Today directly.
// If you wanted to bind it to a property, it would look like this:
// private DateTime? currentWeekDisplay = DateTime.Today;
// And the Razor would be: @bind-Value="currentWeekDisplay"

private DateTime? weekChangedValue = null;

/// Event handler for the ValueChanged event of the P11WeekPicker.
/// Updates the bound value and logs the change to the console.
private void OnWeekChanged(DateTime? newWeek)
{
    weekChangedValue = newWeek;
    Console.WriteLine($"Week changed to: {newWeek?.ToString("yyyy-MM-dd", CultureInfo.CurrentCulture) ?? "null"}");
}