using CommunityToolkit.Mvvm.ComponentModel;
using LehrerApp.Desktop.Services;

namespace LehrerApp.Desktop.ViewModels.Students;

public sealed record AttendanceCalendarSizeChoice(AttendanceCalendarSize Value, string DisplayName);

public partial class AttendanceCalendarConfigurationViewModel : ObservableObject
{
    [ObservableProperty] private DateTimeOffset? _startMonth;
    [ObservableProperty] private int _monthCount;
    [ObservableProperty] private AttendanceCalendarSizeChoice _selectedSize;

    public IReadOnlyList<int> MonthCounts { get; } = [1, 2, 3];
    public IReadOnlyList<AttendanceCalendarSizeChoice> Sizes { get; } =
    [
        new(AttendanceCalendarSize.Small, "Klein"),
        new(AttendanceCalendarSize.Medium, "Standard"),
        new(AttendanceCalendarSize.Large, "Groß"),
    ];

    public AttendanceCalendarConfigurationViewModel(AttendanceCalendarOptions options)
    {
        StartMonth = new DateTimeOffset(options.NormalizedStartMonth.ToDateTime(TimeOnly.MinValue));
        MonthCount = options.NormalizedMonthCount;
        SelectedSize = Sizes.First(s => s.Value == options.Size);
    }

    public AttendanceCalendarOptions BuildResult()
    {
        var date = DateOnly.FromDateTime((StartMonth ?? DateTimeOffset.Now).LocalDateTime);
        return new AttendanceCalendarOptions(new DateOnly(date.Year, date.Month, 1), MonthCount,
            SelectedSize.Value);
    }
}