lagerprogramm/ViewModels/AdditionSearchDialogViewModel.cs

using System.Collections.ObjectModel;
using System.ComponentModel;
using System.Linq;
using System.Runtime.CompilerServices;
using Lagerprogramm.Models;

namespace Lagerprogramm.ViewModels;

public class AdditionSearchDialogViewModel : INotifyPropertyChanged
{
    private readonly ObservableCollection<Addition> _allAdditions;
    private readonly ObservableCollection<Addition> _filteredAdditions;
    private string _searchText = string.Empty;
    private Addition? _selectedAddition;

    public ObservableCollection<Addition> FilteredAdditions => _filteredAdditions;
    public Addition? SelectedAddition
    {
        get => _selectedAddition;
        set
        {
            _selectedAddition = value;
            OnPropertyChanged();
        }
    }

    public string SearchText
    {
        get => _searchText;
        set
        {
            _searchText = value;
            FilterAdditions();
            OnPropertyChanged();
        }
    }

    public AdditionSearchDialogViewModel(ObservableCollection<Addition> additions)
    {
        _allAdditions = additions;
        _filteredAdditions = new ObservableCollection<Addition>(additions);
    }

    private void FilterAdditions()
    {
        _filteredAdditions.Clear();
        if (string.IsNullOrWhiteSpace(SearchText))
        {
            foreach (var a in _allAdditions)
                _filteredAdditions.Add(a);
            return;
        }

        var query = SearchText.ToLower();
        var matches = _allAdditions.Where(a =>
            a.Comment.ToLower().Contains(query) ||
            a.Date.ToString("yyyy-MM-dd").Contains(query) ||
            a.Lines.Any(l => l.PartInternalNumber.ToLower().Contains(query))
        ).ToList();

        foreach (var a in matches)
            _filteredAdditions.Add(a);
    }

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