/*!
 * SparseStateRewardParser.cpp
 *
 *  Created on: 23.12.2012
 *      Author: Christian Dehnert
 */
#include <iostream>
#include "src/parser/SparseStateRewardParser.h"

#include "src/exceptions/WrongFormatException.h"
#include "src/exceptions/OutOfRangeException.h"
#include "src/exceptions/FileIoException.h"
#include "src/utility/cstring.h"
#include "src/parser/MappedFile.h"
#include "log4cplus/logger.h"
#include "log4cplus/loggingmacros.h"
extern log4cplus::Logger logger;

namespace storm {
	namespace parser {

		using namespace storm::utility::cstring;

		std::vector<double> SparseStateRewardParser::parseSparseStateReward(uint_fast64_t stateCount, std::string const & filename) {
			// Open file.
			if (!MappedFile::fileExistsAndIsReadable(filename.c_str())) {
				LOG4CPLUS_ERROR(logger, "Error while parsing " << filename << ": File does not exist or is not readable.");
				throw storm::exceptions::FileIoException() << "Error while parsing " << filename << ": File does not exist or is not readable.";
			}

			MappedFile file(filename.c_str());
			char const* buf = file.getData();

			// Create state reward vector with given state count.
			std::vector<double> stateRewards(stateCount);

			// Now parse state reward assignments.
			uint_fast64_t state = 0;
			uint_fast64_t lastState = (uint_fast64_t)-1;
			uint_fast64_t const startIndexComparison = lastState;
			double reward;

			// Iterate over states.
			while (buf[0] != '\0') {

				// Parse state number and reward value.
				state = checked_strtol(buf, &buf);

				// If the state has already been read or skipped once there might be a problem with the file (doubled lines, or blocks).
				// Note: The value -1 shows that lastState has not yet been set, i.e. this is the first run of the loop (state index (2^64)-1 is a really bad starting index).
				if (state <= lastState && lastState != startIndexComparison) {
					LOG4CPLUS_ERROR(logger, "Error while parsing " << filename << ": State " << state << " was found but has already been read or skipped previously.");
					throw storm::exceptions::WrongFormatException() << "Error while parsing " << filename << ": State " << state << " was found but has already been read or skipped previously.";
				}

				if(stateCount <= state) {
					LOG4CPLUS_ERROR(logger, "Error while parsing " << filename << ": Found reward for a state of an invalid index \"" << state << "\". The model has only " << stateCount << " states.");
					throw storm::exceptions::OutOfRangeException() << "Error while parsing " << filename << ": Found reward for a state of an invalid index \"" << state << "\"";
				}

				reward = checked_strtod(buf, &buf);

				if (reward < 0.0) {
					LOG4CPLUS_ERROR(logger, "Error while parsing " << filename << ": Expected positive reward value but got \"" << reward << "\".");
					throw storm::exceptions::WrongFormatException() << "Error while parsing " << filename << ": State reward file specifies illegal reward value.";
				}

				stateRewards[state] = reward;

				buf = trimWhitespaces(buf);
				lastState = state;
			}
			return stateRewards;
		}

	}  // namespace parser
}  // namespace storm