Demka/Demka-2/Views/MainWindow.axaml.cs

using Avalonia.Controls;
using Avalonia.Markup.Xaml;
using System.Collections.ObjectModel;
using System.Linq;
using Demka_2.Use;
using System;

namespace Demka_2.Views;

public partial class MainWindow : Window
{
    private ObservableCollection<Service> Services { get; set; } = new ObservableCollection<Service>();
    private ObservableCollection<Service> FilteredServices { get; set; } = new ObservableCollection<Service>();

    private TextBox _searchBox;
    private ComboBox _discountFilter;
    private ListBox _serviceList;
    private TextBlock _serviceCountText;

    public MainWindow()
    {
        InitializeComponent();
        LoadServices();
        UpdateFilteredServices();
    }

    private void InitializeComponent()
    {
        AvaloniaXamlLoader.Load(this);
        _searchBox = this.FindControl<TextBox>("SearchBox");
        _discountFilter = this.FindControl<ComboBox>("DiscountFilter");
        _serviceList = this.FindControl<ListBox>("ServiceList");
        _serviceCountText = this.FindControl<TextBlock>("ServiceCountText");

        _serviceList.ItemsSource = FilteredServices;
        _searchBox.TextChanged += SearchBox_TextChanged;
        _discountFilter.SelectionChanged += DiscountFilter_SelectionChanged;
    }

    private void LoadServices()
    {
        using (var context = new AppDbContext())
        {
            var services = context.Services.ToList();
            foreach (var service in services)
            {
                Services.Add(service);
            }

        }
    }

    private void UpdateFilteredServices()
    {
        var query = Services.AsEnumerable();

        if (!string.IsNullOrWhiteSpace(_searchBox.Text))
        {
            string searchQuery = _searchBox.Text.ToLower();
            query = query.Where(service =>
                service.Name.ToLower().Contains(searchQuery) ||
                service.Description.ToLower().Contains(searchQuery));
        }

        if (_discountFilter.SelectedItem is TextBlock selected && selected.Text != "Все")
        {
            var range = ParseDiscountRange(selected.Text);
            if (range != null)
            {
                query = query.Where(service =>
                    service.Discount >= range.Value.min && service.Discount < range.Value.max);
            }
        }

        FilteredServices.Clear();
        foreach (var service in query)
        {
            FilteredServices.Add(service);
        }

        _serviceCountText.Text = $"{FilteredServices.Count} из {Services.Count}";
    }

    private void SearchBox_TextChanged(object? sender, EventArgs e)
    {
        UpdateFilteredServices();
    }

    private void DiscountFilter_SelectionChanged(object? sender, SelectionChangedEventArgs e)
    {
        UpdateFilteredServices();
    }

    private (decimal min, decimal max)? ParseDiscountRange(string rangeText)
    {
        return rangeText switch
        {
            "0-5%" => (0, 5),
            "5-15%" => (5, 15),
            "15-30%" => (15, 30),
            "30-70%" => (30, 70),
            "70-100%" => (70, 100),
            _ => null,
        };
    }
}