ViewModels/EquipmentViewModel.cs - master - naz_number/InventoryApp

ViewModels/EquipmentViewModel.cs
140 строк4 KB
Nazar Melnik
есть кнопка удаления
17 дек 2025, 17:51
17 дек 2025, 17:512eeefdb
using System;
using System.Collections.ObjectModel;
using System.ComponentModel;
using System.Linq;
using System.Runtime.CompilerServices;
using System.Windows.Input;
using InventoryApp.Models;
using Microsoft.EntityFrameworkCore;

namespace InventoryApp.ViewModels;

public class EquipmentViewModel : INotifyPropertyChanged
{
    private readonly ObservableCollection<Equipment> _allEquipment = new();
    private ObservableCollection<Equipment> _equipment = new();
    private bool _isOldFirst = false;
    private string? _searchText;

    public ObservableCollection<Equipment> EquipmentList
    {
        get => _equipment;
        set
        {
            if (!Equals(_equipment, value))
            {
                _equipment = value;
                OnPropertyChanged();
                OnPropertyChanged(nameof(TotalRecords));
            }
        }
    }

    /// <summary>
    /// Общее количество записей в списке.
    /// </summary>
    public int TotalRecords => EquipmentList?.Count ?? 0;

    /// <summary>
    /// Текст на кнопке сортировки.
    /// </summary>
    public string SortButtonText => _isOldFirst ? "Сначала новые" : "Сначала старые";

    /// <summary>
    /// Общая строка поиска.
    /// </summary>
    public string? SearchText
    {
        get => _searchText;
        set
        {
            if (_searchText != value)
            {
                _searchText = value;
                OnPropertyChanged();
                ApplyFilters();
            }
        }
    }

    /// <summary>
    /// Команда сортировки по дате покупки.
    /// </summary>
    public ICommand OrderByCommand { get; }

    public EquipmentViewModel()
    {
        using var db = new InventoryTechparkContext();

        var equipment = db.Equipment
            .Include(e => e.Location)
            .Include(e => e.Employee)
            .Include(e => e.Status)
            .Include(e => e.EquipmentType)
            .OrderByDescending(e => e.PurchaseDate)
            .ToList();

        foreach (var e in equipment)
        {
            _allEquipment.Add(e);
        }

        ApplyFilters();

        OrderByCommand = new RelayCommand(ExecuteOrderByCommand);
    }

    private void ExecuteOrderByCommand(object? parameter)
    {
        _isOldFirst = !_isOldFirst;
        ApplyFilters();
        OnPropertyChanged(nameof(SortButtonText));
    }

    /// <summary>
    /// Удаление записи из локальной коллекции и обновление списка.
    /// </summary>
    public void RemoveEquipment(int equipmentId)
    {
        var item = _allEquipment.FirstOrDefault(e => e.Id == equipmentId);
        if (item != null)
        {
            _allEquipment.Remove(item);
            ApplyFilters();
        }
    }

    /// <summary>
    /// Применение фильтров поиска и сортировки к полной коллекции.
    /// </summary>
    private void ApplyFilters()
    {
        var query = _allEquipment.AsEnumerable();

        if (!string.IsNullOrWhiteSpace(_searchText))
        {
            var text = _searchText.Trim().ToLowerInvariant();

            query = query.Where(e =>
                (e.Name ?? string.Empty).ToLowerInvariant().Contains(text) ||
                (e.InventoryNumber?.ToString() ?? string.Empty).ToLowerInvariant().Contains(text) ||
                (e.SerialNumber ?? string.Empty).ToLowerInvariant().Contains(text) ||
                (e.Employee?.Fio ?? string.Empty).ToLowerInvariant().Contains(text) ||
                (e.Location?.Building ?? string.Empty).ToLowerInvariant().Contains(text) ||
                (e.Location?.RoomNumber ?? string.Empty).ToLowerInvariant().Contains(text) ||
                (e.Status?.Name ?? string.Empty).ToLowerInvariant().Contains(text) ||
                (e.EquipmentType?.Name ?? string.Empty).ToLowerInvariant().Contains(text));
        }

        query = _isOldFirst
            ? query.OrderBy(e => e.PurchaseDate)
            : query.OrderByDescending(e => e.PurchaseDate);

        EquipmentList = new ObservableCollection<Equipment>(query.ToList());
    }

    public event PropertyChangedEventHandler? PropertyChanged;

    protected void OnPropertyChanged([CallerMemberName] string? name = null) =>
        PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(name));
}