// Copyright 2005, 2006 - Morten Nielsen (www.iter.dk)
//
// This file is part of SharpMap.
// SharpMap is free software; you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
// 
// SharpMap is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU Lesser General Public License for more details.

// You should have received a copy of the GNU Lesser General Public License
// along with SharpMap; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA 

using System.IO;
using System.Reflection;
using System.Xml;

namespace SharpMap.Converters.WellKnownText
{
    /// <summary>
    /// Converts spatial reference IDs to a Well-Known Text representation.
    /// </summary>
    public class SpatialReference
    {
        /// <summary>
        /// Converts a Spatial Reference ID to a Well-known Text representation
        /// </summary>
        /// <param name="srid">Spatial Reference ID</param>
        /// <returns>Well-known text</returns>
        public static string SridToWkt(int srid)
        {
            XmlDocument xmldoc = new XmlDocument();

            string file = Path.GetDirectoryName(Assembly.GetExecutingAssembly().CodeBase) + "\\SpatialRefSys.xml";
            //if (!System.IO.File.Exists(file))
            //	throw new ApplicationException("Spatial reference system database not found: " + file);
            xmldoc.Load(file);
            //xmldoc.Load(System.Reflection.Assembly.GetExecutingAssembly().GetManifestResourceStream("SharpMap.SpatialReference.SpatialRefSys.xml"));
            XmlNode node = xmldoc.DocumentElement.SelectSingleNode("/SpatialReference/ReferenceSystem[SRID='" + srid.ToString() + "']");
            if (node != null)
            {
                return node.LastChild.InnerText;
            }
            else
            {
                return "";
            }
        }
    }
}