//
// Mono.Net.Dns.DnsResourceRecord
//
// Authors:
//	Gonzalo Paniagua Javier (gonzalo.mono@gmail.com)
//
// Copyright 2011 Gonzalo Paniagua Javier
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
using System;
using System.Collections.Generic;
using System.IO;
using System.Text;

namespace Mono.Net.Dns {
	class DnsResourceRecord {
		string name;
		DnsType type;
		DnsClass klass;
		int ttl;
		ushort rdlength;
		ArraySegment<byte> m_rdata;

		internal DnsResourceRecord() {
		}

		internal void CopyFrom(DnsResourceRecord rr) {
			name = rr.name;
			type = rr.type;
			klass = rr.klass;
			ttl = rr.ttl;
			rdlength = rr.rdlength;
			m_rdata = rr.m_rdata;
		}

		static internal DnsResourceRecord CreateFromBuffer(DnsPacket packet, int size, ref int offset) {
			string pname = packet.ReadName(ref offset);
			DnsType ptype = (DnsType)packet.ReadUInt16(ref offset);
			DnsClass pclass = (DnsClass)packet.ReadUInt16(ref offset);
			int pttl = packet.ReadInt32(ref offset);
			ushort prdlength = packet.ReadUInt16(ref offset);
			DnsResourceRecord rr = new DnsResourceRecord();
			rr.name = pname;
			rr.type = ptype;
			rr.klass = pclass;
			rr.ttl = pttl;
			rr.rdlength = prdlength;
			rr.m_rdata = new ArraySegment<byte>(packet.Packet, offset, prdlength);
			offset += prdlength;

			switch(pclass) {
			case DnsClass.IN:
				switch(ptype) {
				case DnsType.A:
					rr = new DnsResourceRecordA(rr);
					break;
				case DnsType.AAAA:
					rr = new DnsResourceRecordAAAA(rr);
					break;
				case DnsType.CNAME:
					rr = new DnsResourceRecordCName(rr);
					break;
				case DnsType.PTR:
					rr = new DnsResourceRecordPTR(rr);
					break;
				default:
					break;
					}
				break;
			default:
				break;
			}
			return rr;
		}

		public string Name {
			get { return name; }
		}

		public DnsType Type {
			get { return type; }
		}

		public DnsClass Class {
			get { return klass; }
		}

		public int Ttl {
			get { return ttl; }
		}

		public ArraySegment<byte> Data {
			get { return m_rdata; }
		}

		public override string ToString() {
			return String.Format("Name: {0}, Type: {1}, Class: {2}, Ttl: {3}, Data length: {4}", name, type, klass, ttl, Data.Count);
		}
	}
}