#region Disclaimer / License
// Copyright (C) 2010, Jackie Ng
// http://trac.osgeo.org/mapguide/wiki/maestro, jumpinjackie@gmail.com
// 
// This library 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 2.1 of the License, or (at your option) any later version.
// 
// This library 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 this library; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
// 
#endregion
using System;
using System.Collections.Generic;
using System.Text;
using System.Xml;
using OSGeo.MapGuide.MaestroAPI.CoordinateSystem;

namespace OSGeo.MapGuide.MaestroAPI
{
    public class HttpCoordinateSystemCatalog : CoordinateSystemCatalog
    {
        private HttpServerConnection m_con;
		private RequestBuilder m_req;
		private CoordinateSystemCategory[] m_categories;
		private string m_coordLib = null;

        internal HttpCoordinateSystemCatalog(HttpServerConnection con, RequestBuilder req)
		{
			m_con = con;
			m_req = req;
		}

		internal HttpServerConnection Connection { get { return m_con; } }
		internal RequestBuilder RequestBuilder { get { return m_req; } }

        public override CoordinateSystemCategory[] Categories
		{
			get
			{
				if (m_categories == null)
				{
					string req = m_req.EnumerateCategories();
					XmlDocument doc = new XmlDocument();
					doc.Load(m_con.OpenRead(req));
					XmlNodeList lst = doc.SelectNodes("StringCollection/Item");
                    CoordinateSystemCategory[] data = new CoordinateSystemCategory[lst.Count];
					for(int i = 0; i < lst.Count; i++)
						data[i] = new HttpCoordinateSystemCategory(this, lst[i].InnerText);
					m_categories = data;
				}

				return m_categories;
			}
		}

        public override string LibraryName
		{
			get 
			{
				if (m_coordLib == null)
				{
					string req = m_req.GetBaseLibrary();
					m_coordLib = System.Text.Encoding.UTF8.GetString(m_con.DownloadData(req));
				}
				return m_coordLib;
			}
		}

        public override bool IsValid(string wkt)
		{
			string req = m_req.IsValidCoordSys(wkt);
			return System.Text.Encoding.UTF8.GetString(m_con.DownloadData(req)).ToLower().Trim().Equals("true");
		}

        public override string ConvertWktToCoordinateSystemCode(string wkt)
		{
			string req = m_req.ConvertWktToCoordinateSystemCode(wkt);
            return System.Text.Encoding.UTF8.GetString(m_con.DownloadData(req)).Trim('\0');
		}

        public override string ConvertCoordinateSystemCodeToWkt(string coordcode)
		{
			string req = m_req.ConvertCoordinateSystemCodeToWkt(coordcode);
            return System.Text.Encoding.UTF8.GetString(m_con.DownloadData(req)).Trim('\0');
		}

        public override string ConvertWktToEpsgCode(string wkt)
		{
			string req = m_req.ConvertWktToEpsgCode(wkt);
            return System.Text.Encoding.UTF8.GetString(m_con.DownloadData(req)).Trim('\0');
		}

        public override string ConvertEpsgCodeToWkt(string epsg)
		{
			string req = m_req.ConvertEpsgCodeToWkt(epsg);
            return System.Text.Encoding.UTF8.GetString(m_con.DownloadData(req)).Trim('\0');
		}

        public override bool IsLoaded { get { return m_categories != null; } }

        public override CoordinateSystem.CoordinateSystemDefinitionBase[] EnumerateCoordinateSystems(string category)
        {
            CoordinateSystemCategory cat = null;
            foreach (CoordinateSystemCategory csc in this.Categories)
            {
                if (csc.Name == category)
                {
                    cat = csc;
                    break;
                }
            }

            if (cat == null)
                return new CoordinateSystemDefinitionBase[0];

            string req = this.RequestBuilder.EnumerateCoordinateSystems(category);
            XmlDocument doc = new XmlDocument();
            doc.Load(m_con.OpenRead(req));
            XmlNodeList lst = doc.SelectNodes("BatchPropertyCollection/PropertyCollection");
            CoordinateSystemDefinitionBase[] data = new CoordinateSystemDefinitionBase[lst.Count];
            for (int i = 0; i < lst.Count; i++)
                data[i] = new HttpCoordinateSystemDefinition(cat, lst[i]);

            return data;
        }

        public override CoordinateSystem.CoordinateSystemDefinitionBase CreateEmptyCoordinateSystem()
        {
            return new HttpCoordinateSystemDefinition();
        }
    }
}