/*
 * Copyright (c) 2025 Proton AG
 *
 * This file is part of ProtonVPN.
 *
 * ProtonVPN 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.
 *
 * ProtonVPN 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 ProtonVPN.  If not, see <https://www.gnu.org/licenses/>.
 */

using System.Collections.Generic;
using Microsoft.UI.Xaml;
using Microsoft.UI.Xaml.Media;

namespace ProtonVPN.Client.Common.UI.Extensions;

public static class DependencyObjectExtensions
{
    public static IEnumerable<T> FindChildrenOfType<T>(this DependencyObject parent) where T : DependencyObject
    {
        if (parent == null)
        {
            yield break;
        }

        for (int i = 0; i < VisualTreeHelper.GetChildrenCount(parent); i++)
        {
            DependencyObject child = VisualTreeHelper.GetChild(parent, i);

            if (child is T typedChild)
            {
                yield return typedChild;
            }

            foreach (T descendant in FindChildrenOfType<T>(child))
            {
                yield return descendant;
            }
        }
    }

    public static bool IsDescendantOf(this DependencyObject current, FrameworkElement ancestor)
    {
        while (current != null)
        {
            if (ReferenceEquals(current, ancestor))
            {
                return true;
            }

            current = VisualTreeHelper.GetParent(current);
        }

        return false;
    }
}