using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.Runtime.Serialization;
using System.Xml.Linq;
using Neo.Afx.ComponentModel;

namespace Neo.Afx.Services.Integration
{
    /// <summary>
    /// An instance of a <see cref="DataSource"/>.
    /// </summary>
    [DataContract]
    public class DataEntity
    {
        #region Constructor

        /// <summary>
        /// Initializes a new instance of the <see cref="DataEntity"/> class.
        /// </summary>
        public DataEntity()
        {
            Properties = new Dictionary<string, string>();
        }

        #endregion

        #region Key

        /// <summary>
        /// Gets or sets the key.
        /// </summary>
        [Key]
        [DataMember]
        public string Key
        {
            get;
            set;
        }

        #endregion

        #region Title

        /// <summary>
        /// Gets or sets the title.
        /// </summary>
        [DataMember]
        public string Title
        {
            get;
            set;
        }

        #endregion

        #region Properties

        /// <summary>
        /// Gets the properties.
        /// </summary>
        [DataMember]
        public Dictionary<string, string> Properties
        {
            get;
            private set;
        }

        #endregion

        #region Indexer

        /// <summary>
        /// Gets or sets the <see cref="System.Object"/> with the specified property name.
        /// </summary>
        public string this[string propertyName]
        {
            get
            {
                return Properties[propertyName];
            }
            set
            {
                Properties[propertyName] = value;
            }
        }

        #endregion

        #region Create

        /// <summary>
        /// Creates a <see cref="DataEntity"/> from the given XML representation.
        /// </summary>
        /// <param name="xml">The XML representation of the entity.</param>
        /// <returns>A <see cref="DataEntity"/> instance.</returns>
        public static DataEntity Create(XElement xml)
        {
            var result = new DataEntity
            {
                Key = xml.Element("key").ToString(string.Empty),
                Title = xml.Element("title").ToString(string.Empty)
            };

            var properties = xml.Element("properties");
            if(properties != null)
            {
                foreach(var property in properties.Elements())
                {
                    result.Properties.Add(property.Name.LocalName, property.Value);
                }
            }
            return result;
        }

        #endregion

    }
}