
/*
 *
 * Copyright (c) 2006 The Apache Software Foundation
 *
 * 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.
 *
 */
#include "qpid/framing/AMQFrame.h"
#include "qpid/QpidError.h"

using namespace qpid::framing;

AMQFrame::AMQFrame(){}

AMQFrame::AMQFrame(u_int16_t _channel, AMQBody* _body) : channel(_channel), body(_body){}

AMQFrame::AMQFrame(u_int16_t _channel, AMQBody::shared_ptr& _body) : channel(_channel), body(_body){}

AMQFrame::~AMQFrame(){
}

u_int16_t AMQFrame::getChannel(){
    return channel;
}

AMQBody::shared_ptr& AMQFrame::getBody(){
    return body;
}

void AMQFrame::encode(Buffer& buffer)
{
    buffer.putOctet(body->type());
    buffer.putShort(channel);    
    buffer.putLong(body->size());
    body->encode(buffer);
    buffer.putOctet(0xCE);
}

AMQBody::shared_ptr createMethodBody(Buffer& buffer){
    u_int16_t classId = buffer.getShort();
    u_int16_t methodId = buffer.getShort();
    AMQBody::shared_ptr body(createAMQMethodBody(classId, methodId));
    return body;
}

u_int32_t AMQFrame::size() const{
    if(!body.get()) THROW_QPID_ERROR(INTERNAL_ERROR, "Attempt to get size of frame with no body set!");
    return 1/*type*/ + 2/*channel*/ + 4/*body size*/ + body->size() + 1/*0xCE*/;
}

bool AMQFrame::decode(Buffer& buffer)
{    
    if(buffer.available() < 7) return false;
    buffer.record();
    u_int32_t bufSize = decodeHead(buffer);

    if(buffer.available() < bufSize + 1){
        buffer.restore();
        return false;
    }
    decodeBody(buffer, bufSize);
    u_int8_t end = buffer.getOctet();
    if(end != 0xCE) THROW_QPID_ERROR(FRAMING_ERROR, "Frame end not found");
    return true;
}

u_int32_t AMQFrame::decodeHead(Buffer& buffer){    
    type = buffer.getOctet();
    channel = buffer.getShort();
    return buffer.getLong();
}

void AMQFrame::decodeBody(Buffer& buffer, uint32_t bufSize)
{    
    switch(type)
    {
    case METHOD_BODY:
	body = createMethodBody(buffer);
	break;
    case HEADER_BODY: 
	body = AMQBody::shared_ptr(new AMQHeaderBody()); 
	break;
    case CONTENT_BODY: 
	body = AMQBody::shared_ptr(new AMQContentBody()); 
	break;
    case HEARTBEAT_BODY: 
	body = AMQBody::shared_ptr(new AMQHeartbeatBody()); 
	break;
    default:
	string msg("Unknown body type: ");
	msg += type;
	THROW_QPID_ERROR(FRAMING_ERROR, msg);
    }
    body->decode(buffer, bufSize);
}

std::ostream& qpid::framing::operator<<(std::ostream& out, const AMQFrame& t){
    out << "Frame[channel=" << t.channel << "; ";
    if (t.body.get() == 0) out << "empty";
    else out << *t.body;
    out << "]";
    return out;
}

