Password-Manager-Legacy/GUI/PasswordListBox.cs

using System.Collections;

namespace GUI;

public delegate string SearchQuery();
public class PasswordListBox : ListBox
{
    public event DataRequest? PathRequest;
    public event SearchQuery? SearchQueryRequest;

    public PasswordListBox(DataRequest PathRequest, SearchQuery? SearchQueryRequest = null) : base()
    {
        this.PathRequest = PathRequest;
        this.SearchQueryRequest = SearchQueryRequest;
    }

    public PasswordListBox() : base() { }
    /*do not instantiate this class using this constructor if you want to use the ReloadResults method afterwards.
     Use this so that the MainForm.Designer.cs file doesn't have a stroke due to Event References, then re-instantiate the object
     afterwards using the other constructor*/

    public void ReloadResults(object? sender = null, EventArgs? arg = null)
    {
        DirectoryInfo d;
        FileInfo[] files = new FileInfo[0];
        try
        {
            if (PathRequest != null)
            {
                d = new DirectoryInfo(PathRequest());
            }
            else
            {
                throw new InvalidOperationException("You cannot use the ReloadResults method if you instantiated the object using the parameterless constructor");
            }
            files = d.GetFiles("*.gpg");
        }
        catch (ArgumentNullException e)
        {
            MessageBox.Show(e.ToString(), "Error: Invalid path", MessageBoxButtons.OK, MessageBoxIcon.Error);
        }

        List<string> elements = new List<string>();
        for (int i = 0; i < files.Length; i++)
        {
            elements.Add(files[i].Name);
        }

        string[] copy = elements.ToArray();

        string? searchQuery = SearchQueryRequest?.Invoke();
        if (searchQuery != null) //we have a search query
        {
            foreach (string s in copy)
            {
                if (!s.Contains(searchQuery))
                {
                    elements.Remove(s);
                }
            }
        }

        this.DataSource = elements;
        try
        {
            SelectedIndex = 0;
        } catch (ArgumentOutOfRangeException)
        {
            SelectedIndex = -1;
        }
    }
}