//-----------------------------------------------------------------------------
// <copyright file="RSSChannelModel.cs" company="BTU/IIT">
//     Company copyright tag.
// </copyright>
// <author>fiedlchr</author>
// <sience>24.06.2013</sience>
//-----------------------------------------------------------------------------
namespace CampusAppWP8ScheduledTaskAgent.Model.RSS
{
    using System.Collections.ObjectModel;
    using System.Collections.Specialized;
    using System.Xml.Serialization;

    /// <summary>
    /// Channel Model, which contains the RSS feed item list.
    /// </summary>
    public class RSSChannelModel
    {
        /// <summary>
        /// RSS feed information item list.
        /// </summary>
        private ObservableCollection<RSSModel> item;

        #region Constructor

        /// <summary>
        /// Initializes a new instance of the <see cref="RSSChannelModel" /> class.
        /// </summary>
        public RSSChannelModel()
        {
            this.item = new ObservableCollection<RSSModel>();
            this.item.CollectionChanged += new NotifyCollectionChangedEventHandler(this.OnListChanged);
        }

        #endregion

        #region Property

        /// <summary>
        /// Gets or sets the RSS feed item list.
        /// </summary>
        [XmlElement("item")]
        public ObservableCollection<RSSModel> Item
        {
            get
            {
                return this.item;
            }

            set
            {
                if (value != this.item)
                {
                    this.item = value;
                }
            }
        }

        #endregion

        #region Method

        /// <summary>
        /// Is called when the item list has changed.
        /// Here used for the add event.
        /// Set the index of the last list element.
        /// </summary>
        /// <param name="sender">item list</param>
        /// <param name="e">event args</param>
        private void OnListChanged(object sender, NotifyCollectionChangedEventArgs e)
        {
            if (e.Action == NotifyCollectionChangedAction.Add)
            {
                ObservableCollection<RSSModel> list = sender as ObservableCollection<RSSModel>;

                list[list.Count - 1].Index = list.Count - 1;
            }
        }

        #endregion
    }
}