struct PermissionAlert: ViewModifier {

    var message: String
    @Binding var isPresented: Bool

    func body(content: Content) -> some View {
        content
            .alert(message, isPresented: $isPresented) {
                Button("Cancel", role: .cancel, action: {})
                Button("Go to Settings") { goToSettingsAction() }
            } message: { }
    }

    private func goToSettingsAction() {
        guard let url = URL(string: UIApplication.openSettingsURLString),
              UIApplication.shared.canOpenURL(url) else {
            return
        }
        UIApplication.shared.open(url, options: [:], completionHandler: nil)
    }
}

extension View {
    /// Presents an alert that gives an option to route to the app settings if some permission is denied.
    /// - Parameters:
    ///   - message: The message to show on the alert.
    ///   - isPresented: Binds to the presentation of the alert.
    func permissionAlert(_ message: String, isPresented: Binding<Bool>) -> some View {
        modifier(PermissionAlert(message: message, isPresented: isPresented))
    }

    /// Presents the alert if photo library access has not been given.
    func photoLibraryPermissionAlert(isPresented: Binding<Bool>) -> some View {
        permissionAlert("Photo Library access has not been granted.", isPresented: isPresented)
    }
}