/*
    Copyright (C) 2014-2019 de4dot@gmail.com

    This file is part of dnSpy

    dnSpy is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    dnSpy is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with dnSpy.  If not, see <http://www.gnu.org/licenses/>.
*/

using System.ComponentModel.Composition;
using Ookii.Dialogs.Wpf;

namespace dnSpy.Contracts.MVVM {
	/// <summary>
	/// Asks the user to pick a directory
	/// </summary>
	public interface IPickDirectory {
		/// <summary>
		/// Lets the user pick a directory. Returns null if user canceled.
		/// </summary>
		/// <param name="currentDir">Current directory or null</param>
		/// <returns></returns>
		string? GetDirectory(string? currentDir = null);
	}

	/// <summary>
	/// Implements <see cref="IPickDirectory"/>
	/// </summary>
	[Export(typeof(IPickDirectory))]
	public sealed class PickDirectory : IPickDirectory {
		/// <inheritdoc/>
		public string? GetDirectory(string? currentDir) {
			var dlg = new VistaFolderBrowserDialog();
			dlg.SelectedPath = currentDir ?? string.Empty;
			if (dlg.ShowDialog() != true)
				return null;

			return dlg.SelectedPath;
		}
	}
}