lagerprogramm/ViewModels/DeductionSearchDialogViewModel.cs

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

namespace Lagerprogramm.ViewModels;

public class DeductionSearchDialogViewModel : INotifyPropertyChanged
{
    private readonly ObservableCollection<Deduction> _allDeductions;
    private readonly ObservableCollection<Deduction> _filteredDeductions;
    private string _searchText = string.Empty;
    private Deduction? _selectedDeduction;

    public ObservableCollection<Deduction> FilteredDeductions => _filteredDeductions;
    public Deduction? SelectedDeduction
    {
        get => _selectedDeduction;
        set
        {
            _selectedDeduction = value;
            OnPropertyChanged();
        }
    }

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

    public DeductionSearchDialogViewModel(ObservableCollection<Deduction> deductions)
    {
        _allDeductions = deductions;
        _filteredDeductions = new ObservableCollection<Deduction>(deductions);
    }

    private void FilterDeductions()
    {
        _filteredDeductions.Clear();
        if (string.IsNullOrWhiteSpace(SearchText))
        {
            foreach (var d in _allDeductions)
                _filteredDeductions.Add(d);
            return;
        }

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

        foreach (var d in matches)
            _filteredDeductions.Add(d);
    }

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