using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.ComponentModel;
using System.Xml;
using System.Windows;

namespace Xceed.Wpf.Documentation
{
  public class XmlPropertyDescriptor : PropertyDescriptor
  {
    public XmlPropertyDescriptor( XmlDataGridItemProperty itemProperty )
      : base( "None", null )
    {
      if( itemProperty == null )
        throw new ArgumentNullException( "itemProperty" );

      m_itemProperty = itemProperty;
    }

    public override string DisplayName
    {
      get
      {
        return m_itemProperty.Name;
      }
    }

    public override bool CanResetValue( object component )
    {
      return false;
    }

    public override Type ComponentType
    {
      get
      {
        return typeof( XmlElement );
      }
    }

    public override object GetValue( object component )
    {
      XmlElement node = component as XmlElement;

      if( node == null )
        return null;

      object retval = null;

      XmlNode childNode = node.SelectSingleNode( m_itemProperty.Name );
      if( childNode != null )
      {
        retval = Convert.ChangeType( childNode.InnerText, this.PropertyType );
      }

      return retval;
    }

    public override bool IsReadOnly
    {
      get
      {
        return false;
      }
    }

    public override Type PropertyType
    {
      get
      {
        return m_itemProperty.DataType;
      }
    }

    public override void ResetValue( object component )
    {
    }

    public override void SetValue( object component, object value )
    {
      XmlElement node = component as XmlElement;

      if( node == null )
        return;

      node.SelectSingleNode( m_itemProperty.Name ).InnerText = value.ToString();
    }

    public override bool ShouldSerializeValue( object component )
    {
      return false;
    }

    private XmlDataGridItemProperty m_itemProperty;
  }
}