using CommunityToolkit.Mvvm.ComponentModel;
using CommunityToolkit.Mvvm.Input;
using LehrerApp.Core.Models;
using System.Globalization;

namespace LehrerApp.Desktop.ViewModels.Students;

public sealed record GroupDocumentationOption(Guid Id, string DisplayName);

/// Kompakte Erfassung einer gruppenweiten Planungsnotiz aus der globalen Befehlspalette.
public partial class GroupDocumentationQuickViewModel(IEnumerable<GroupDocumentationOption> groups)
    : ObservableObject
{
    public List<GroupDocumentationOption> Groups { get; } = groups.ToList();
    [ObservableProperty] private GroupDocumentationOption? _selectedGroup;
    [ObservableProperty] private string _title = "";
    [ObservableProperty] private string _content = "";
    [ObservableProperty] private string _dateText = DateOnly.FromDateTime(DateTime.Today).ToString("dd.MM.yyyy");
    [ObservableProperty] private string _groupError = "";
    [ObservableProperty] private string _titleError = "";
    [ObservableProperty] private string _dateError = "";

    public Documentation? Result { get; private set; }

    [RelayCommand]
    private void Save()
    {
        GroupError = TitleError = DateError = "";
        if (SelectedGroup is null) GroupError = "Lerngruppe auswählen.";
        if (string.IsNullOrWhiteSpace(Title)) TitleError = "Titel erforderlich.";
        if (!DateOnly.TryParseExact(DateText, "dd.MM.yyyy", null, DateTimeStyles.None, out var date))
            DateError = "Format TT.MM.JJJJ.";
        if (GroupError.Length > 0 || TitleError.Length > 0 || DateError.Length > 0) return;

        Result = new Documentation
        {
            StudentId = Guid.Empty,
            GroupId = SelectedGroup!.Id,
            Type = DocumentationType.Planning,
            Date = date,
            Title = Title.Trim(),
            Content = Content.Trim(),
            ExcludeFromWebUntisSync = true,
        };
    }
}