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

namespace Lagerprogramm.ViewModels;

public class PartSearchDialogViewModel : INotifyPropertyChanged
{
    private readonly ObservableCollection<Part> _allParts;
    private readonly ObservableCollection<Part> _filteredParts;
    private string _searchText = string.Empty;
    private Part? _selectedPart;

    public ObservableCollection<Part> FilteredParts => _filteredParts;
    public Part? SelectedPart
    {
        get => _selectedPart;
        set
        {
            _selectedPart = value;
            OnPropertyChanged();
        }
    }

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

    public PartSearchDialogViewModel(IEnumerable<Part> parts)
    {
        _allParts = new ObservableCollection<Part>(parts);
        _filteredParts = new ObservableCollection<Part>(_allParts);
    }

    private void FilterParts()
    {
        _filteredParts.Clear();
        if (string.IsNullOrWhiteSpace(SearchText))
        {
            foreach (var part in _allParts)
                _filteredParts.Add(part);
            return;
        }

        var query = SearchText.ToLower();
        var matches = _allParts.Where(p =>
            p.InternalPartNumber.ToLower().Contains(query) ||
            p.ManufacturerPartNumber.ToLower().Contains(query) ||
            p.Ean.ToLower().Contains(query) ||
            p.SupplierPartNumber.ToLower().Contains(query) ||
            p.Manufacturer.ToLower().Contains(query) ||
            p.Supplier.ToLower().Contains(query) ||
            p.Description.ToLower().Contains(query)
        ).ToList();

        foreach (var part in matches)
            _filteredParts.Add(part);
    }

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