// Copyright 2016-2021 Cisco Systems Inc
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.

import Foundation

extension UIAlertController {
    
    // Present the alert on top of the visible UIViewController.
    func present(_ animated: Bool, completion: (() -> Void)?) -> UIWindow {
        // Get new UIWindow at the top of the window hierarchy
        let window = UIWindow(frame: UIScreen.main.bounds)
        window.rootViewController = UIViewController()
        window.backgroundColor = UIColor.clear
        #if swift(>=4.2)
        window.windowLevel = UIWindow.Level.alert
        #else
        window.windowLevel = UIWindowLevelAlert
        #endif
        if let rootVC = window.rootViewController {
            window.makeKeyAndVisible()
            rootVC.present(self, animated: animated, completion: completion)
        }
        return window
    }
}
