presence/Presence.Desktop/ViewModels/PresenceViewModel.cs

using Avalonia.Data.Converters;
using domain.Models;
using domain.UseCase;
using Presence.Desktop.ViewModels;
using ReactiveUI;
using System;
using System.Collections.ObjectModel;
using System.Globalization;
using System.Reactive;

namespace Presence.Desktop.ViewModels
{
    public class PresenceViewModel : ViewModelBase, IRoutableViewModel
    {
        public string? UrlPathSegment { get; } = "Presence";
        public IScreen HostScreen { get; }

        private readonly GroupUseCase _groupUseCase;
        private readonly UseCaseGeneratePresence _presenceUseCase;

        public ObservableCollection<PresenceLocalEntity> AttendanceRecords { get; set; } = new();
        public ObservableCollection<Group> Groups { get; set; } = new();

        private Group? _selectedGroup;
        public Group? SelectedGroup
        {
            get => _selectedGroup;
            set
            {
                this.RaiseAndSetIfChanged(ref _selectedGroup, value);
                FilterAttendanceRecords();
            }
        }

        private DateTime? _selectedDate;
        public DateTime? SelectedDate
        {
            get => _selectedDate;
            set
            {
                this.RaiseAndSetIfChanged(ref _selectedDate, value);
                FilterAttendanceRecords();
            }
        }

        public ReactiveCommand<Unit, Unit> NavigateBackCommand { get; }

        public PresenceViewModel(IScreen hostScreen, GroupUseCase groupUseCase, UseCaseGeneratePresence presenceUseCase)
        {
            _groupUseCase = groupUseCase;
            _presenceUseCase = presenceUseCase;
            HostScreen = hostScreen;

            NavigateBackCommand = ReactiveCommand.Create(() => { });

            LoadGroups();
        }

        private void LoadGroups()
        {
            Groups.Clear();
            var groups = _groupUseCase.GetAllGroups();

            foreach (var group in groups)
            {
                Groups.Add(group);
            }
        }

        private void FilterAttendanceRecords()
        {
            if (SelectedGroup == null || SelectedDate == null)
            {
                AttendanceRecords.Clear();
                return;
            }

            var records = _presenceUseCase.GetPresenceByGroupAndDate(
                SelectedGroup.Id,
                SelectedDate.Value);

            AttendanceRecords.Clear();
            foreach (var record in records)
            {
                AttendanceRecords.Add(record);
            }
        }

        public void UpdateAttendanceType(PresenceLocalEntity presence)
        {
            _presenceUseCase.UpdateAttendance(presence);
        }

        
    }
}