#region

using System.Windows;
using System.Windows.Controls;
using System.Windows.Media;

#endregion

namespace Cmc.Installer.Core.Controls
{
    public sealed class BindablePasswordBox : Decorator
    {
        /// <summary>
        ///     The password dependency property.
        /// </summary>
        public static readonly DependencyProperty PasswordProperty;
        public static readonly DependencyProperty BorderBrushProperty;

        private readonly RoutedEventHandler _savedCallback;
        private bool _isPreventCallback;

        /// <summary>
        ///     Static constructor to initialize the dependency properties.
        /// </summary>
        static BindablePasswordBox()
        {
            PasswordProperty = DependencyProperty.Register(
                "Password",
                typeof (string),
                typeof (BindablePasswordBox),
                new FrameworkPropertyMetadata("", FrameworkPropertyMetadataOptions.BindsTwoWayByDefault,
                    OnPasswordPropertyChanged)
                );

            BorderBrushProperty = DependencyProperty.Register(
                "BorderBrush",
                typeof(Brush),
                typeof(BindablePasswordBox),
                new PropertyMetadata(default(Brush))
                );
        }

        /// <summary>
        ///     Saves the password changed callback and sets the child element to the password box.
        /// </summary>
        public BindablePasswordBox()
        {
            _savedCallback = HandlePasswordChanged;

            var passwordBox = new PasswordBox();
            passwordBox.PasswordChanged += _savedCallback;
            Child = passwordBox;
        }

        /// <summary>
        ///     The password dependency property.
        /// </summary>
        public string Password
        {
            get { return GetValue(PasswordProperty) as string; }
            set { SetValue(PasswordProperty, value); }
        }

        public Brush BorderBrush
        {
            get { return (Brush)GetValue(BorderBrushProperty); }
            set { SetValue(BorderBrushProperty, value); }
        }

        /// <summary>
        ///     Handles changes to the password dependency property.
        /// </summary>
        /// <param name="d">the dependency object</param>
        /// <param name="eventArgs">the event args</param>
        private static void OnPasswordPropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs eventArgs)
        {
            var bindablePasswordBox = (BindablePasswordBox) d;
            var passwordBox = (PasswordBox) bindablePasswordBox.Child;

            if (bindablePasswordBox._isPreventCallback)
            {
                return;
            }

            passwordBox.PasswordChanged -= bindablePasswordBox._savedCallback;
            passwordBox.Password = (eventArgs.NewValue != null) ? eventArgs.NewValue.ToString() : "";
            passwordBox.PasswordChanged += bindablePasswordBox._savedCallback;
        }

        /// <summary>
        ///     Handles the password changed event.
        /// </summary>
        /// <param name="sender">the sender</param>
        /// <param name="eventArgs">the event args</param>
        private void HandlePasswordChanged(object sender, RoutedEventArgs eventArgs)
        {
            var passwordBox = (PasswordBox) sender;

            _isPreventCallback = true;
            Password = passwordBox.Password;
            _isPreventCallback = false;
        }
    }
}