﻿/**********************************************************************
 * Copyright (c) 2010, j. montgomery                                  *
 * All rights reserved.                                               *
 *                                                                    *
 * Redistribution and use in source and binary forms, with or without *
 * modification, are permitted provided that the following conditions *
 * are met:                                                           *
 *                                                                    *
 * + Redistributions of source code must retain the above copyright   *
 *   notice, this list of conditions and the following disclaimer.    *
 *                                                                    *
 * + Redistributions in binary form must reproduce the above copyright*
 *   notice, this list of conditions and the following disclaimer     *
 *   in the documentation and/or other materials provided with the    *
 *   distribution.                                                    *
 *                                                                    *
 * + Neither the name of j. montgomery's employer nor the names of    *
 *   its contributors may be used to endorse or promote products      *
 *   derived from this software without specific prior written        *
 *   permission.                                                      *
 *                                                                    *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS*
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT  *
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS  *
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE     *
 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,*
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES           *
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR *
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) *
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,*
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)      *
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED*
 * OF THE POSSIBILITY OF SUCH DAMAGE.                                 *
 **********************************************************************/
using System;
using System.IO;
using System.Net;
using TravelRepublic.DnsClient.Records;

namespace TravelRepublic.DnsClient.Parsers
{
    class SrvParser
        : IRecordParser
    {
        readonly RecordNameParser _parser;

        public SrvParser(RecordNameParser parser)
        {
            _parser = parser;
        }
        
        public Record ParseRecord(RecordHeader header, ref MemoryStream ms)
        {
            var priorityBuffer = new byte[2];
            ms.Read(priorityBuffer, 0, 2);
            var priority = (ushort)IPAddress.NetworkToHostOrder((short)BitConverter.ToUInt16(priorityBuffer, 0));

            var weightBuffer = new byte[2];
            ms.Read(weightBuffer, 0, 2);
            var weight = (ushort)IPAddress.NetworkToHostOrder((short)BitConverter.ToUInt16(weightBuffer, 0));

            var portBuffer = new byte[2];
            ms.Read(portBuffer, 0, 2);
            var port = (ushort)IPAddress.NetworkToHostOrder((short)BitConverter.ToUInt16(portBuffer, 0));

            var hostName = _parser.ParseName(ref ms);

            var answer = "Service Location: \r\nPriority: " + priority + "\r\nWeight: " +
                weight + "\r\nPort: " + port + "\r\nHostName: " + hostName + "\r\n";

            return new SrvRecord(priority, weight, port, hostName, answer);
        }
    }
}
