1314/prakt1314/ViewModels/CourcesListViewModel.cs

using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Linq;
using System.Text.RegularExpressions;
using Microsoft.EntityFrameworkCore;
using ReactiveUI;

namespace prakt1314.ViewModels
{
	public class CourcesListViewModel : ReactiveObject
	{
        public CourcesListViewModel()
        {
            using (AvaloniaPrakt13DbContext _db = new AvaloniaPrakt13DbContext())
            {
                _courcesBeforeFFS = _db.Cources.Include(a => a.TeacherCources).ToList();
            }
            FFS();
        }


        public ObservableCollection<Cource> Cources
        {
            get => _courcesAfterFFS;
            set => this.RaiseAndSetIfChanged(ref _courcesAfterFFS, value);
        }

        public int SelectedFilterIndex
        {
            get => _selectedFilterIndex;
            set
            {
                this.RaiseAndSetIfChanged(ref _selectedFilterIndex, value);
                FFS();
            }
        }
        public int SelectedSortIndex
        {
            get => _selectedSortIndex;
            set
            {
                this.RaiseAndSetIfChanged(ref _selectedSortIndex, value);
                FFS();
            }
        }

        public string SearchQuarry
        {
            get => _searchQuarry;
            set
            {
                this.RaiseAndSetIfChanged(ref _searchQuarry, value);
                FFS();
            }
        }

        public bool IsSearchByName
        {
            get => _isSearchByName;
            set
            {
                this.RaiseAndSetIfChanged(ref _isSearchByName, value);
                FFS();
            }
        }
        public bool IsSortingABS
        {
            get => _isSortingABS;
            set
            {
                this.RaiseAndSetIfChanged(ref _isSortingABS, value);
                FFS();
            }
        }


        private ObservableCollection<Cource> _courcesAfterFFS = new ObservableCollection<Cource>();

        private List<Cource> _courcesBeforeFFS = new List<Cource>();

        private int _selectedFilterIndex = 0;
        private int _selectedSortIndex = 0;

        private string _searchQuarry = "";

        private bool _isSearchByName = true;
        private bool _isSortingABS = true;


        private void FFS()
        {
            Cources.Clear();
            List<Cource> FilteredCource = new List<Cource>();
            switch (SelectedFilterIndex)
            {
                case 0:
                    {
                        foreach (Cource c in _courcesBeforeFFS)
                        {
                            FilteredCource.Add(c);
                        }
                        break;
                    }
                case 1:
                    {
                        foreach (Cource c in _courcesBeforeFFS)
                        {
                            if (c.HoursNumber >= 0 && c.HoursNumber < 30)
                            {
                                FilteredCource.Add(c);
                            }
                        }
                        break;
                    }
                case 2:
                    {
                        foreach (Cource c in _courcesBeforeFFS)
                        {
                            if (c.HoursNumber >= 30 && c.HoursNumber < 60)
                            {
                                FilteredCource.Add(c);
                            }
                        }
                        break;
                    }
                case 3:
                    {
                        foreach (Cource c in _courcesBeforeFFS)
                        {
                            if (c.HoursNumber >= 60 && c.HoursNumber < 120)
                            {
                                FilteredCource.Add(c);
                            }
                        }
                        break;
                    }
                case 4:
                    {
                        foreach (Cource c in _courcesBeforeFFS)
                        {
                            if (c.HoursNumber >= 120)
                            {
                                FilteredCource.Add(c);
                            }
                        }
                        break;
                    }
            }
            List<Cource> SearchedCources = FilteredCource;
            if (SearchQuarry is not null && SearchQuarry.Length != 0)
            {
                SearchedCources = new List<Cource>();
                switch (_isSearchByName)
                {
                    case true:
                        {
                            foreach (Cource c in FilteredCource)
                            {
                                if (Regex.IsMatch(c.Cource1, SearchQuarry)) SearchedCources.Add(c);
                            }
                            break;
                        }
                    case false:
                        {
                            foreach (Cource c in FilteredCource)
                            {
                                if (Regex.IsMatch(c.HoursNumber.ToString(), SearchQuarry)) SearchedCources.Add(c);
                            }
                            break;
                        }
                }
            }
            else;

            switch (IsSortingABS)
            {
                case true:
                    switch (SelectedSortIndex)
                    {
                        case 0:
                            Cources = new ObservableCollection<Cource>(SearchedCources.OrderBy((a) => a.Cource1));
                            return;
                        case 1:
                            Cources = new ObservableCollection<Cource>(SearchedCources.OrderBy((a) => a.HoursNumber));
                            return;
                    }
                    return;
                case false:
                    switch (SelectedSortIndex)
                    {
                        case 0:
                            Cources = new ObservableCollection<Cource>(SearchedCources.OrderByDescending((a) => a.Cource1));
                            return;
                        case 1:
                            Cources = new ObservableCollection<Cource>(SearchedCources.OrderByDescending((a) => a.HoursNumber));
                            return;
                    }
                    return;
            }
        }
    }
}