/*
* Copyright 2008, 2010 Free Software Foundation, Inc.
* Copyright 2012, 2014 Range Networks, Inc.
*
* This software is distributed under multiple licenses; see the COPYING file in the main directory for licensing information for this specific distribution.
*
* This use of this software may be subject to additional restrictions.
* See the LEGAL file in the main directory for details.

    This program 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.

*/




#include <Logger.h>

#include "TRXManager.h"

#include <Globals.h>
#include <GSMCommon.h>
#include <GSMTransfer.h>
#include <GSMLogicalChannel.h>
#include <GSMConfig.h>
#include <GSML1FEC.h>

#include <Reporting.h>

#include <string>
#include <string.h>
#include <stdlib.h>

#undef WARNING


using namespace GSM;
using namespace std;


TransceiverManager::TransceiverManager(int numARFCNs,
		const char* wTRXAddress, int wBasePort)
	:mHaveClock(false),
	mClockSocket(wBasePort+100)
{
	// set up the ARFCN managers
	for (int i=0; i<numARFCNs; i++) {
		int thisBasePort = wBasePort + 1 + 2*i;
		mARFCNs.push_back(new ::ARFCNManager(wTRXAddress,thisBasePort,*this));
	}
}



void TransceiverManager::start()
{
	mClockThread.start((void*(*)(void*))ClockLoopAdapter,this);
	for (unsigned i=0; i<mARFCNs.size(); i++) {
		mARFCNs[i]->start();
	}
}





void* ClockLoopAdapter(TransceiverManager *transceiver)
{
	// This loop checks the clock messages from the transceiver.
	// These messages keep the BTS clock in sync with the hardware,
	// and also serve as a heartbeat for the radiomodem.

	// This is a convenient place for other periodic housekeeping as well.

	// This loop has a period of about 3 seconds.

	gResetWatchdog();
	while (! gBTS.btsShutdown()) {
		transceiver->clockHandler();
		LOG(DEBUG) << "watchdog timer expires in " << gWatchdogRemaining() << " seconds";
		if (gWatchdogExpired()) {
			LOG(ALERT) << "restarting OpenBTS on expiration of watchdog timer";
			gReports.incr("OpenBTS.Exit.Error.Watchdog");
			exit(-2);
		}
	}
	return NULL;
}



void TransceiverManager::clockHandler()
{
	char buffer[MAX_UDP_LENGTH];
	int msgLen;
	try {
		msgLen = mClockSocket.read(buffer,gConfig.getNum("TRX.Timeout.Clock")*1000);
	} catch (SocketError) {
		LOG(ERR) <<"Transceiver Clock Interface read error:"<<strerror(errno);
		return;
	}

	// Did the transceiver die??
	if (msgLen<0) {
		LOG(EMERG) << "TRX clock interface timed out, assuming TRX is dead.";
		gReports.incr("OpenBTS.Exit.Error.TransceiverHeartbeat");
#if RN_DEVELOPER_MODE
		// (pat) Added so you can keep debugging without the radio.
		static int foo = 0;
		pthread_exit(&foo);
#else
		exit(2);	// (pat 3-2014) changed from abort to exit, old:  abort();
#endif
	}

	if (msgLen==0) {
		LOG(ALERT) << "read error on TRX clock interface, return " << msgLen;
		return;
	}

	if (strncmp(buffer,"IND CLOCK",9)==0) {
		uint32_t FN;
		sscanf(buffer,"IND CLOCK %u", &FN);
		LOG(INFO) << "CLOCK indication, current clock = " << gBTS.clock().clockGet() << " new clock ="<<FN;
		gBTS.clock().clockSet(FN);
		mHaveClock = true;
		return;
	}

	buffer[msgLen]='\0';
	LOG(ALERT) << "bogus message " << buffer << " on clock interface";
}




unsigned TransceiverManager::C0() const
{
	return mARFCNs.at(0)->ARFCN();
}







::ARFCNManager::ARFCNManager(const char* wTRXAddress, int wBasePort, TransceiverManager &wTransceiver)
	:mTransceiver(wTransceiver),
	mDataSocket(wBasePort+100+1,wTRXAddress,wBasePort+1),
	mControlSocket(wBasePort+100,wTRXAddress,wBasePort)
{
	// The default demux table is full of NULL pointers.
	for (int i=0; i<8; i++) {
		for (unsigned j=0; j<maxModulus; j++) {
			mDemuxTable[i][j] = NULL;
		}
	}
}




void ::ARFCNManager::start()
{
	mRxThread.start((void*(*)(void*))ReceiveLoopAdapter,this);
}


void ::ARFCNManager::installDecoder(GSM::L1Decoder *wL1d)
{
	unsigned TN = wL1d->TN();
	const TDMAMapping& mapping = wL1d->mapping();

	// Is this mapping a valid uplink on this slot?
	assert(mapping.uplink());
	assert(mapping.allowedSlot(TN));

	LOG(DEBUG) << "ARFCNManager::installDecoder TN: " << TN << " repeatLength: " << mapping.repeatLength();

	mTableLock.lock();
	for (unsigned i=0; i<mapping.numFrames(); i++) {
		unsigned FN = mapping.frameMapping(i);
		while (FN<maxModulus) {
			// Don't overwrite existing entries.
			assert(mDemuxTable[TN][FN]==NULL);
			mDemuxTable[TN][FN] = wL1d;
			FN += mapping.repeatLength();
		}
	}
	mTableLock.unlock();
}




// (pat) renamed overloaded function to clarify code
void ::ARFCNManager::writeHighSideTx(const GSM::TxBurst& burst,const char *culprit)
{
	LOG(DEBUG) << culprit << " transmit at time " << gBTS.clock().clockGet() << ": " << burst 
		<<" steal="<<(int)burst.peekField(60,1)<<(int)burst.peekField(87,1);
	// format the transmission request message
	static const int bufferSize = gSlotLen+1+4+1;
	char buffer[bufferSize];
	unsigned char *wp = (unsigned char*)buffer;
	// slot
	*wp++ = burst.time().TN();
	// frame number
	uint32_t FN = burst.time().FN();
	*wp++ = (FN>>24) & 0x0ff;
	*wp++ = (FN>>16) & 0x0ff;
	*wp++ = (FN>>8) & 0x0ff;
	*wp++ = (FN) & 0x0ff;
	// power level
	/// FIXME -- We hard-code gain to 0 dB for now.
	*wp++ = 0;
	// copy data
	const char *dp = burst.begin();
	for (unsigned i=0; i<gSlotLen; i++) {
		*wp++ = (unsigned char)((*dp++) & 0x01);
	}
	// write to the socket
	mDataSocketLock.lock();
	mDataSocket.write(buffer,bufferSize);
	mDataSocketLock.unlock();
}




void ::ARFCNManager::driveRx()
{
	// read the message
	char buffer[MAX_UDP_LENGTH];
	int msgLen = mDataSocket.read(buffer);
	if (msgLen<=0) SOCKET_ERROR;
	// decode
	unsigned char *rp = (unsigned char*)buffer;
	// timeslot number
	unsigned TN = *rp++;
	// frame number
	int32_t FN = *rp++;
	FN = (FN<<8) + (*rp++);
	FN = (FN<<8) + (*rp++);
	FN = (FN<<8) + (*rp++);
	// physcial header data
	signed char* srp = (signed char*)rp++;
	// reported RSSI is negated dB wrt full scale
	int RSSI = *srp;
	srp = (signed char*)rp++;
	// timing error comes in 1/256 symbol steps
	// because that fits nicely in 2 bytes
	int timingError = *srp;
	timingError = (timingError<<8) | (*rp++);
	// soft symbols
	float data[gSlotLen];
	for (unsigned i=0; i<gSlotLen; i++) data[i] = (*rp++) / 256.0F;
	// demux
	receiveBurst(RxBurst(data,GSM::Time(FN,TN),timingError/256.0F,-RSSI));
}


void* ReceiveLoopAdapter(::ARFCNManager* manager){
	while (! gBTS.btsShutdown()) {
		manager->driveRx();
		pthread_testcancel();
	}
	return NULL;
}





int ::ARFCNManager::sendCommandPacket(const char* command, char* response)
{
	int msgLen = 0;
	response[0] = '\0';

	LOG(INFO) << "command " << command;
	mControlLock.lock();

	for (int retry=0; retry<5; retry++) {
		mControlSocket.write(command);
		msgLen = mControlSocket.read(response,1000);
		if (msgLen>0) {
			response[msgLen] = '\0';
			break;
		}
		LOG(WARNING) << "TRX link timeout on attempt " << retry+1;
		// Dont wait so long.
		if (gConfig.defines("DeveloperMode") && 0 == strcmp(command,"CMD POWERON")) {
			printf("Developer mode, curtailing transceiver poweron test\n"); fflush(stdout);
			return 0;
		}
	}

	mControlLock.unlock();
	LOG(INFO) << "response " << response;

	if ((msgLen>4) && (strncmp(response,"RSP ",4)==0)) {
		return msgLen;
	}

	LOG(NOTICE) << "lost control link to transceiver";
	return 0;
}



// TODO : lots of duplicate code in these sendCommand()s
int ::ARFCNManager::sendCommand(const char*command, const char*param, int *responseParam)
{
	// Send command and get response.
	char cmdBuf[MAX_UDP_LENGTH];
	char response[MAX_UDP_LENGTH];
	sprintf(cmdBuf,"CMD %s %s", command, param);
	int rspLen = sendCommandPacket(cmdBuf,response);
	if (rspLen<=0) return -1;
	// Parse and check status.
	char cmdNameTest[15];
	int status;
	cmdNameTest[0]='\0';
        if (!responseParam)
	  sscanf(response,"RSP %15s %d", cmdNameTest, &status);
        else
          sscanf(response,"RSP %15s %d %d", cmdNameTest, &status, responseParam);
	if (strcmp(cmdNameTest,command)!=0) return -1;
	return status;
}

int ::ARFCNManager::sendCommand(const char*command, int param, int *responseParam)
{
	// Send command and get response.
	char cmdBuf[MAX_UDP_LENGTH];
	char response[MAX_UDP_LENGTH];
	sprintf(cmdBuf,"CMD %s %d", command, param);
	int rspLen = sendCommandPacket(cmdBuf,response);
	if (rspLen<=0) return -1;
	// Parse and check status.
	char cmdNameTest[15];
	int status;
	cmdNameTest[0]='\0';
        if (!responseParam)
	  sscanf(response,"RSP %15s %d", cmdNameTest, &status);
        else
          sscanf(response,"RSP %15s %d %d", cmdNameTest, &status, responseParam);
	if (strcmp(cmdNameTest,command)!=0) return -1;
	return status;
}


int ::ARFCNManager::sendCommand(const char*command, const char* param)
{
	// Send command and get response.
	char cmdBuf[MAX_UDP_LENGTH];
	char response[MAX_UDP_LENGTH];
	sprintf(cmdBuf,"CMD %s %s", command, param);
	int rspLen = sendCommandPacket(cmdBuf,response);
	if (rspLen<=0) return -1;
	// Parse and check status.
	char cmdNameTest[15];
	int status;
	cmdNameTest[0]='\0';
	sscanf(response,"RSP %15s %d", cmdNameTest, &status);
	if (strcmp(cmdNameTest,command)!=0) return -1;
	return status;
}



int ::ARFCNManager::sendCommand(const char*command)
{
	// Send command and get response.
	char cmdBuf[MAX_UDP_LENGTH];
	char response[MAX_UDP_LENGTH];
	sprintf(cmdBuf,"CMD %s", command);
	int rspLen = sendCommandPacket(cmdBuf,response);
	if (rspLen<=0) return -1;
	// Parse and check status.
	char cmdNameTest[15];
	int status;
	cmdNameTest[0]='\0';
	sscanf(response,"RSP %15s %d", cmdNameTest, &status);
	if (strcmp(cmdNameTest,command)!=0) return -1;
	return status;
}




bool ::ARFCNManager::tune(int wARFCN)
{
	// convert ARFCN number to a frequency
	unsigned rxFreq = uplinkFreqKHz(gBTS.band(),wARFCN);
	unsigned txFreq = downlinkFreqKHz(gBTS.band(),wARFCN);
	// tune rx
	int status = sendCommand("RXTUNE",rxFreq);
	if (status!=0) {
		LOG(ALERT) << "RXTUNE("<<wARFCN<<") failed with status " << status;
		return false;
	}
	// tune tx
	status = sendCommand("TXTUNE",txFreq);
	if (status!=0) {
		LOG(ALERT) << "TXTUNE failed with status " << status;
		return false;
	}
	// done
	mARFCN=wARFCN;
	return true;
}



bool ::ARFCNManager::tuneLoopback(int wARFCN)
{
	// convert ARFCN number to a frequency
	unsigned txFreq = downlinkFreqKHz(gBTS.band(),wARFCN);
	// tune rx
	int status = sendCommand("RXTUNE",txFreq);
	if (status!=0) {
		LOG(ALERT) << "RXTUNE failed with status " << status;
		return false;
	}
	// tune tx
	status = sendCommand("TXTUNE",txFreq);
	if (status!=0) {
		LOG(ALERT) << "TXTUNE failed with status " << status;
		return false;
	}
	// done
	mARFCN=wARFCN;
	return true;
}


bool ::ARFCNManager::powerOff()
{
	int status = sendCommand("POWEROFF");
	if (status!=0) {
		LOG(INFO) << "POWEROFF failed with status " << status;
		return false;
	}
	return true;
}


bool ::ARFCNManager::powerOn(bool warn)
{
	int status = sendCommand("POWERON");
	if (status!=0) {
		if (warn) {
			LOG(ALERT) << "POWERON failed with status " << status;
		} else {
			LOG(INFO) << "POWERON failed with status " << status;
		}
		
		return false;
	}
	return true;
}

bool ::ARFCNManager::trxRunning()
{
	int status = sendCommand("POWEROFF");
	return status == 0;
}





bool ::ARFCNManager::setPower(int dB)
{
	int status = sendCommand("SETPOWER",dB);
	if (status!=0) {
		LOG(ALERT) << "SETPOWER failed with status " << status;
		return false;
	}
	return true;
}


bool ::ARFCNManager::setTSC(unsigned TSC) 
{
	assert(TSC<8);
	int status = sendCommand("SETTSC",TSC);
	if (status!=0) {
		LOG(ALERT) << "SETTSC failed with status " << status;
		return false;
	}
	return true;
}


bool ::ARFCNManager::setBSIC(unsigned BSIC)
{
	assert(BSIC < 64);
	int status = sendCommand("SETBSIC",BSIC);
	if (status!=0) {
		LOG(ALERT) << "SETBSIC failed with status " << status;
		return false;
	}
	return true;
}


bool ::ARFCNManager::setSlot(unsigned TN, unsigned combination)
{
	assert(TN<8);
	// (pat) had to remove assertion here:
	//assert(combination<8);
	char paramBuf[MAX_UDP_LENGTH];
	sprintf(paramBuf,"%d %d", TN, combination);
	int status = sendCommand("SETSLOT",paramBuf);
	if (status!=0) {
		LOG(ALERT) << "SETSLOT("<<TN<<","<<combination<<") failed with status " << status;
		return false;
	}
	return true;
}

bool ::ARFCNManager::setMaxDelay(unsigned km)
{
        int status = sendCommand("SETMAXDLY",km);
        if (status!=0) {
                LOG(ALERT) << "SETMAXDLY failed with status " << status;
                return false;
        }
        return true;
}

signed ::ARFCNManager::setRxGain(signed rxGain)
{
        signed newRxGain;
        int status = sendCommand("SETRXGAIN",rxGain,&newRxGain);
        if (status!=0) {
                LOG(ALERT) << "SETRXGAIN failed with status " << status;
                return false;
        }
        return newRxGain;
}


bool ::ARFCNManager::setHandover(unsigned TN)
{
	assert(TN<8);
	int status = sendCommand("HANDOVER",TN);
	if (status!=0) {
		LOG(ALERT) << "HANDOVER("<<TN<<") failed with status " << status;
		return false;
	}
	return true;
}


bool ::ARFCNManager::clearHandover(unsigned TN)
{
	assert(TN<8);
	int status = sendCommand("NOHANDOVER",TN);
	if (status!=0) {
		LOG(ALERT) << "NOHANDOVER("<<TN<<") failed with status " << status;
		return false;
	}
	return true;
}


signed ::ARFCNManager::setTxAtten(signed txAtten)
{
        signed newTxAtten;
        int status = sendCommand("SETTXATTEN",txAtten,&newTxAtten);
        if (status!=0) {
                LOG(ALERT) << "SETTXATTEN failed with status " << status;
                return false;
        }
        return newTxAtten;
}

signed ::ARFCNManager::setFreqOffset(signed offset)
{
        signed newFreqOffset;
        int status = sendCommand("SETFREQOFFSET",offset,&newFreqOffset);
        if (status!=0) {
                LOG(ALERT) << "SETFREQOFFSET failed with status " << status;
                return false;
        }
        return newFreqOffset;
}


signed ::ARFCNManager::getNoiseLevel(void)
{
	signed noiselevel;
	int status = sendCommand("NOISELEV",0,&noiselevel);
        if (status!=0) {
                LOG(ALERT) << "NOISELEV failed with status " << status;
                return false;
        }
        return noiselevel;
}

signed ::ARFCNManager::getFactoryCalibration(const char * param)
{
	signed value;
	int status = sendCommand("READFACTORY", param, &value);
	if (status!=0) {
		LOG(INFO) << "READFACTORY failed with status " << status;
		return false;
	}
	return value;
}

void ::ARFCNManager::receiveBurst(const RxBurst& inBurst)
{
	if (inBurst.RSSI() < gConfig.getNum("TRX.MinimumRxRSSI")) {
		LOG(DEBUG) << "ignoring " << inBurst;
		return;
	}

	LOG(DEBUG) << "processing " << inBurst;
	uint32_t FN = inBurst.time().FN() % maxModulus;
	unsigned TN = inBurst.time().TN();

	ScopedLock lock(mTableLock);
	L1Decoder *proc = mDemuxTable[TN][FN];
	if (proc==NULL) {
		LOG(DEBUG) << "ARFNManager::receiveBurst time " << inBurst.time() << " in unconfigured TDMA position T" << TN << " FN=" << FN << ".";
		return;
	}
	proc->writeLowSideRx(inBurst);
}


// vim: ts=4 sw=4