// --------------------------------------------------------------------------------------------------------------------
// <copyright file="PropertyChangedBase.cs" company="HandBrake Project (http://handbrake.fr)">
//   This file is part of the HandBrake source code - It may be used under the terms of the GNU General Public License.
// </copyright>
// <summary>
//   A base class that implements the infrastructure for property change notification and automatically performs UI thread marshalling.
//   This class is a modified version of the caliburn micro 
// </summary>
// --------------------------------------------------------------------------------------------------------------------

namespace HandBrake.ApplicationServices.Utilities
{
    using System;
    using System.ComponentModel;
    using System.Linq.Expressions;
    using System.Runtime.Serialization;

    /// <summary>
    /// Property Changed Base implimentation.
    /// </summary>
    [DataContract]
    public class PropertyChangedBase : INotifyPropertyChanged
    {
        /// <summary>
        /// Creates an instance of <see cref = "PropertyChangedBase" />.
        /// </summary>
        public PropertyChangedBase()
        {
            IsNotifying = true;
        }

        /// <summary>
        /// Occurs when a property value changes.
        /// </summary>
        public event PropertyChangedEventHandler PropertyChanged = delegate { };

        /// <summary>
        /// Enables/Disables property change notification.
        /// </summary>
        public bool IsNotifying { get; set; }

        /// <summary>
        /// Raises a change notification indicating that all bindings should be refreshed.
        /// </summary>
        public virtual void Refresh()
        {
            NotifyOfPropertyChange(string.Empty);
        }

        /// <summary>
        /// Notifies subscribers of the property change.
        /// </summary>
        /// <param name = "propertyName">Name of the property.</param>
        public virtual void NotifyOfPropertyChange(string propertyName = null)
        {
            if (IsNotifying)
            {
                OnPropertyChanged(new PropertyChangedEventArgs(propertyName));
            }
        }

        /// <summary>
        /// Notifies subscribers of the property change.
        /// </summary>
        /// <typeparam name = "TProperty">The type of the property.</typeparam>
        /// <param name = "property">The property expression.</param>
        public void NotifyOfPropertyChange<TProperty>(Expression<Func<TProperty>> property)
        {
            NotifyOfPropertyChange(property.GetMemberInfo().Name);
        }

        /// <summary>
        /// Raises the <see cref="PropertyChanged" /> event directly.
        /// </summary>
        /// <param name="e">The <see cref="PropertyChangedEventArgs"/> instance containing the event data.</param>
        [EditorBrowsable(EditorBrowsableState.Never)]
        protected void OnPropertyChanged(PropertyChangedEventArgs e)
        {
            var handler = PropertyChanged;
            if (handler != null)
            {
                handler(this, e);
            }
        }
    }
}