using Avalonia.Data.Converters;
using presence.data.RemoteData.RemoteDataBase.DAO;
using presence.domain.Models;
using presence.domain.UseCase;
using Presence.Desktop.Models;
using Presence.Desktop.ViewModels;
using ReactiveUI;
using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Globalization;
using System.Linq;
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 PresenceUseCase _presenceUseCase;

        public ObservableCollection<PresencePresenter> AttendanceRecords { get; set; } = new();
        public ObservableCollection<GroupPresenter> Groups { get; set; } = new();
        private ObservableCollection<PresencePresenter> _selectedItems = new();
        public ObservableCollection<PresencePresenter> SelectedItems
        {
            get => _selectedItems;
            set => this.RaiseAndSetIfChanged(ref _selectedItems, value);
        }

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

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

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

        public PresenceViewModel(GroupUseCase groupUseCase, PresenceUseCase presenceUseCase)
        {
            _groupUseCase = groupUseCase;

            _presenceUseCase = presenceUseCase;


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

            LoadGroups();
        }

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

            foreach (var group in groups)
            {
                Groups.Add(new GroupPresenter
                {
                    Id = group.Id,
                    Name = group.Name
                });
            }
        }

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

            AttendanceRecords.Clear();

            foreach (var selDate in SelectedDate)
            {
                    var records = _presenceUseCase.GetPresenceByGroupAndDate(
                        SelectedGroup.Id,
                        DateOnly.FromDateTime(selDate.Value));

                    foreach (var record in records)
                    {
                        AttendanceRecords.Add(new PresencePresenter
                        {
                            Id = record.Id,
                            Date = record.Date,
                            ClassNumber = record.ClassNumber,
                            IsAttendence = record.IsAttendence,
                            User = new UserPresenter
                            {
                                Id = record.User.Id,
                                Name = record.User.FIO
                            }
                        });
                    }
                
            }

            // Логирование для отладки
            Console.WriteLine($"Загружено записей посещаемости: {AttendanceRecords.Count}");
        }

        private void DeleteSelectedItems()
        {
            if (SelectedItems.Any())
            {
                foreach (var item in SelectedItems.ToList())
                {
                    _presenceUseCase.DeletePresenceByClassNumberAndDateAndUserId(item.ClassNumber, item.Date, item.User.Id); // Удаляем из базы данных
                    AttendanceRecords.Remove(item); // Удаляем из коллекции
                }
            }
        }

        
    }
}