/**
 * @file PoolRawAccessHelper.cpp
 *
 * @date 22.12.2019
 * @author R. Mueller
 */

#include <framework/datapool/PoolRawAccessHelper.h>
#include <framework/datapool/DataSet.h>

PoolRawAccessHelper::PoolRawAccessHelper(uint32_t * poolIdBuffer_,
		uint8_t  numberOfParameters_):
		poolIdBuffer(reinterpret_cast<uint8_t * >(poolIdBuffer_)),
		numberOfParameters(numberOfParameters_), validBufferIndex(0), validBufferIndexBit(1){
}

PoolRawAccessHelper::~PoolRawAccessHelper() {
}

ReturnValue_t PoolRawAccessHelper::serialize(uint8_t **buffer, uint32_t *size,
		const uint32_t max_size, bool bigEndian) {
	SerializationArgs serializationArgs = {buffer, size, max_size, bigEndian};
	ReturnValue_t result;
	int32_t remainingParametersSize = numberOfParameters * 4;
	for(uint8_t count=0; count < numberOfParameters; count++) {
		result = serializeCurrentPoolEntryIntoBuffer(serializationArgs,
				&remainingParametersSize, false);
		if(result != RETURN_OK) {
			return result;
		}
	}
	if(remainingParametersSize != 0) {
		debug << "Pool Raw Access: Remaining parameters size not 0 !" << std::endl;
		result = RETURN_FAILED;
	}
	return result;
}

ReturnValue_t PoolRawAccessHelper::serializeWithValidityMask(uint8_t ** buffer, uint32_t * size,
		const uint32_t max_size, bool bigEndian) {
	ReturnValue_t result;
	SerializationArgs argStruct = {buffer, size, max_size, bigEndian};
	int32_t remainingParametersSize = numberOfParameters * 4;
	uint8_t validityMaskSize = numberOfParameters/8;
	uint8_t validityMask[validityMaskSize];
	memset(validityMask,0, validityMaskSize);
	for(uint8_t count = 0; count < numberOfParameters; count++) {
		result = serializeCurrentPoolEntryIntoBuffer(argStruct,
				&remainingParametersSize,true,validityMask);
		if (result != RETURN_OK) {
			return result;
		}
	}
	if(remainingParametersSize != 0) {
		debug << "Pool Raw Access: Remaining parameters size not 0 !" << std::endl;
		result = RETURN_FAILED;
	}
	memcpy(*buffer + *size, validityMask, validityMaskSize);
	*size += validityMaskSize;
	validBufferIndex = 1;
	validBufferIndexBit = 0;
	return result;
}

ReturnValue_t PoolRawAccessHelper::serializeCurrentPoolEntryIntoBuffer(SerializationArgs argStruct,
		int32_t * remainingParameters, bool withValidMask, uint8_t * validityMask) {
	uint32_t currentPoolId;
	// Deserialize current pool ID from pool ID buffer
	ReturnValue_t result = AutoSerializeAdapter::deSerialize(&currentPoolId,
			&poolIdBuffer,remainingParameters,true);
	if(result != RETURN_OK) {
		debug << std::hex << "Pool Raw Access Helper: Error deSeralizing pool IDs" << std::dec << std::endl;
		return result;
	}
	result = handlePoolEntrySerialization(currentPoolId, argStruct, withValidMask, validityMask);
	return result;
}

ReturnValue_t PoolRawAccessHelper::handlePoolEntrySerialization(uint32_t currentPoolId,SerializationArgs argStruct,
		bool withValidMask, uint8_t * validityMask) {
	ReturnValue_t result = RETURN_FAILED;
	uint8_t arrayPosition = 0;
	uint8_t counter = 0;
	bool poolEntrySerialized = false;
	//debug << "Pool Raw Access Helper: Handling Pool ID: " << std::hex <<  currentPoolId << std::endl;
	while(not poolEntrySerialized) {

		if(counter > DataSet::DATA_SET_MAX_SIZE) {
			error << "Pool Raw Access Helper: Config error, max. number of possible data set variables exceeded" << std::endl;
			return result;
		}
		counter ++;

		DataSet currentDataSet = DataSet();
		//debug << "Current array position: " << (int)arrayPosition << std::endl;
		PoolRawAccess currentPoolRawAccess(currentPoolId,arrayPosition,&currentDataSet,PoolVariableIF::VAR_READ);

		result = currentDataSet.read();
		if (result != RETURN_OK) {
			debug << std::hex << "Pool Raw Access Helper: Error reading raw dataset with returncode 0x"
				  << result << std::dec << std::endl;
			return result;
		}

		result = checkRemainingSize(&currentPoolRawAccess, &poolEntrySerialized, &arrayPosition);
		if(result != RETURN_OK) {
			error << "Pool Raw Access Helper: Configuration Error at pool ID " << std::hex << currentPoolId
				  << ". Size till end smaller than 0" << std::dec << std::endl;
			return result;
		}

		// set valid mask bit if necessary
		if(withValidMask) {
			if(currentPoolRawAccess.isValid()) {
				handleMaskModification(validityMask);
			}
		}

		result = currentDataSet.serialize(argStruct.buffer, argStruct.size,
				argStruct.max_size, argStruct.bigEndian);
		if (result != RETURN_OK) {
			debug << "Pool Raw Access Helper: Error serializing pool data with ID 0x" << std::hex <<
					currentPoolId << " into send buffer with return code " << result << std::dec << std::endl;
			return result;
		}

	}
	return result;
}

ReturnValue_t PoolRawAccessHelper::checkRemainingSize(PoolRawAccess * currentPoolRawAccess,
		bool * isSerialized, uint8_t * arrayPosition) {
	int8_t remainingSize = currentPoolRawAccess->getSizeTillEnd() - currentPoolRawAccess->getSizeOfType();
	if(remainingSize == 0) {
		*isSerialized = true;
	}
	else if(remainingSize > 0) {
		*arrayPosition += 1;
	}
	else {
		return RETURN_FAILED;
	}
	return RETURN_OK;
}

void PoolRawAccessHelper::handleMaskModification(uint8_t * validityMask) {
	validityMask[validBufferIndex] =
			bitSetter(validityMask[validBufferIndex], validBufferIndexBit, true);
	validBufferIndexBit ++;
	if(validBufferIndexBit == 8) {
		validBufferIndex ++;
		validBufferIndexBit = 1;
	}
}

uint8_t PoolRawAccessHelper::bitSetter(uint8_t byte, uint8_t position, bool value) {
	if(position < 1 or position > 8) {
		debug << "Pool Raw Access: Bit setting invalid position" << std::endl;
		return byte;
	}
	uint8_t shiftNumber = position + (6 - 2 * (position - 1));
	byte = (byte | value) <<  shiftNumber;
	return byte;
}