sa-ews1.cpp
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	//===-- apps/sa-ews1/sa-ews1.cpp --------------------------------- C++ --===//
	//
	// The RoSA Framework -- Application SA-EWS1
	//
	// Distributed under the terms and conditions of the Boost Software License 1.0.
	// See accompanying file LICENSE.
	//
	// If you did not receive a copy of the license file, see
	// http://www.boost.org/LICENSE_1_0.txt.
	//
	//===----------------------------------------------------------------------===//
	///
	/// \file apps/sa-ews1/sa-ews1.cpp
	///
	/// \author David Juhasz (david.juhasz@tuwien.ac.at)
	/// Maximilian Goetzinger (maxgot@utu.fi)
	///
	/// \date 2017-2020
	///
	/// \brief The application SA-EWS1 implements the case study from the paper:
	/// M. Götzinger, A. Anzanpour, I. Azimi, N. TaheriNejad, and A. M. Rahmani:
	/// Enhancing the Self-Aware Early Warning Score System Through Fuzzified Data
	/// Reliability Assessment. DOI: 10.1007/978-3-319-98551-0_1
	//===----------------------------------------------------------------------===//

	#include "rosa/agent/Abstraction.hpp"
	#include "rosa/agent/CrossCombinator.h"
	#include "rosa/agent/ReliabilityConfidenceCombination.h"

	#include "rosa/config/version.h"

	#include "rosa/app/Application.hpp"

	#include "rosa/support/csv/CSVReader.hpp"
	#include "rosa/support/csv/CSVWriter.hpp"
	#include "rosa/support/iterator/split_tuple_iterator.hpp"

	#include "cxxopts/cxxopts.hpp"

	#include <fstream>

	using namespace rosa;
	using namespace rosa::agent;
	using namespace rosa::app;
	using namespace rosa::terminal;
	using namespace rosa::csv;
	using namespace rosa::iterator;

	const std::string AppName = "SA-EWS1";

	/// Representation type of warning levels.
	/// \note Make sure it suits all defined enumeration values.
	using WarningScoreType = uint8_t;

	/// Warning levels for abstraction.
	enum WarningScore : WarningScoreType {
	No = 0,
	Low = 1,
	High = 2,
	Emergency = 3
	};

	/// Vector with all possible warning levels.
	std::vector<WarningScore> warningScores = {No, Low, High, Emergency};

	/// Type used to represent reliability values.
	using ReliabilityType = double;

	/// The result type of low-level functions.
	using WarningValue = AppTuple<WarningScoreType, ReliabilityType>;

	/// Helper function creating an application sensor and setting its execution
	/// policy for decimation.
	///
	/// \note The sensors are created without defining a normal generator function,
	/// which is suitable for simulation only.
	///
	/// \tparam T type of values for the sensor to generate
	///
	/// \param App the application to create the sensor in
	/// \param Name name of the new sensor
	/// \param Decimation the decimation parameter
	///
	/// \return handle for the new sensor
	template <typename T>
	AgentHandle createSensor(std::unique_ptr<Application> &App,
	const std::string &Name, const size_t Decimation) {
	AgentHandle Sensor = App->createSensor<T>(Name);
	App->setExecutionPolicy(Sensor, AppExecutionPolicy::decimation(Decimation));
	return Sensor;
	}

	/// Helper function creating an application agent for pre-processing sensory
	/// values and setting its execution policy for decimation.
	///
	/// Received values are assessed for reliability and abstracted into a \c
	/// WarningScore. The result of the processing function is a pair of assessed
	/// reliability and abstracted values.
	///
	/// \note The result, \c WarningScore, is returned as \c WarningScoreType
	/// because enumeration types are not integrated into built-in types. Hence, a
	/// master to these agents receives its input as \c WarningScoreType values, and
	/// may cast them to \c WarningScore explicitly.
	///
	/// \tparam T type of values to receive from the sensor
	///
	/// \param App the application to create the agent in
	/// \param Name name of the new agent
	/// \param Decimation the decimation parameter
	/// \param A abstraction to use
	/// \param R reliability/confidence combination to use
	///
	/// \return handle for the new agent
	template <typename T>
	AgentHandle createLowLevelAgent(
	std::unique_ptr<Application> &App, const std::string &Name,
	const size_t Decimation, const Abstraction<T, WarningScore> &A,
	ReliabilityAndConfidenceCombination<T, WarningScore, ReliabilityType> &R) {
	using result = Optional<WarningValue>;
	using input = AppTuple<T>;
	using handler = std::function<result(std::pair<input, bool>)>;
	AgentHandle Agent = App->createAgent(
	Name, handler([&, Name](std::pair<input, bool> I) -> result {
	LOG_INFO_STREAM << "\n******\n"
	<< Name << " " << (I.second ? "<New>" : "<Old>")
	<< " value: " << PRINTABLE(std::get<0>(I.first))
	<< "\n******\n";
	const auto SensorValue = std::get<0>(I.first);
	const WarningScoreType Score = A(SensorValue);
	const ReliabilityType InputReliability =
	R.getInputReliability(SensorValue);
	return {WarningValue(Score, InputReliability)};
	}));
	App->setExecutionPolicy(Agent, AppExecutionPolicy::decimation(Decimation));
	return Agent;
	}

	/// Helper function to print an error message in red color to the terminal and
	/// exit from the application.
	///
	/// \note The function never returns as it calles `exit()`.
	///
	/// \param Error error message
	/// \param ExitCode exit code to return from the application
	void logErrorAndExit(const std::string &Error, const int ExitCode) {
	LOG_ERROR_STREAM << Color::Red << Error << Color::Default << std::endl;
	exit(ExitCode);
	}

	int main(int argc, char *argv[]) {
	LOG_INFO_STREAM << '\n'
	<< library_string() << " -- " << Color::Red << AppName
	<< " app" << Color::Default << '\n';

	/// Paths for the CSV files for simulation.
	///
	///@{
	std::string DataCSVPath;
	std::string ScoreCSVPath;
	///@}

	/// Whether CSV files have header row at the beginning.
	bool CSVHeader = false;

	/// Delimiter character in CSV files.
	char CSVDelimiter = ',';

	/// Decimation of sensors and agents.
	size_t Decimation = 1;

	/// How many cycles of simulation to perform.
	size_t NumberOfSimulationCycles = 16;

	// Handle command-line arguments.
	try {
	cxxopts::Options Options(argv[0], library_string() + " -- " + AppName);
	Options.add_options()("i,input",
	"Path for the CSV file providing input data",
	cxxopts::value(DataCSVPath), "file")
	("o,output",
	"Path for the CSV file to write output scores",
	cxxopts::value(ScoreCSVPath), "file")
	("header", "CSV files have header row",
	cxxopts::value(CSVHeader)->default_value("false"))
	("delimiter", "CSV delimiter character",
	cxxopts::value(CSVDelimiter)->default_value(","), "char")
	("d,decimation", "Decimation of sensors and agents",
	cxxopts::value(Decimation)->default_value("1"), "int")
	("c,cycles", "Number of simulation cycles to perform",
	cxxopts::value(NumberOfSimulationCycles)->default_value("16"), "int")
	("h,help", "Print usage");

	auto Args = Options.parse(argc, argv);

	if (Args.count("help")) {
	LOG_INFO_STREAM << '\n' << Options.help() << std::endl;
	exit(0);
	}

	if (Args.count("input") == 0) {
	throw std::invalid_argument("Argument --input must be defined.");
	}
	if (Args.count("output") == 0) {
	throw std::invalid_argument("Argument --output must be defined.");
	}
	} catch (const cxxopts::OptionException &e) {
	logErrorAndExit(e.what(), 1);
	} catch (const std::invalid_argument &e) {
	logErrorAndExit(e.what(), 1);
	}

	std::unique_ptr<Application> App = Application::create(AppName);

	//
	// Relevant types and definitions.
	//

	using HRType = int32_t;
	using HRParFun = PartialFunction<HRType, ReliabilityType>;
	using HRLinFun = LinearFunction<HRType, ReliabilityType>;

	using BRType = int32_t;
	using BRParFun = PartialFunction<BRType, ReliabilityType>;
	using BRLinFun = LinearFunction<BRType, ReliabilityType>;

	using SpO2Type = int32_t;
	using SpO2ParFun = PartialFunction<SpO2Type, ReliabilityType>;
	using SpO2LinFun = LinearFunction<SpO2Type, ReliabilityType>;

	using BPSysType = int32_t;
	using BPSysParFun = PartialFunction<BPSysType, ReliabilityType>;
	using BPSysLinFun = LinearFunction<BPSysType, ReliabilityType>;

	using BodyTempType = float;
	using BodyTempParFun = PartialFunction<BodyTempType, ReliabilityType>;
	using BodyTempLinFun = LinearFunction<BodyTempType, ReliabilityType>;

	//
	// Create application sensors.
	//
	LOG_INFO("Creating sensors.");

	// All sensors are created without defining a normal generator function, but
	// with the default value of the second argument. That, however, requires the
	// data type to be explicitly defined. This is good for simulation only.
	AgentHandle HRSensor = createSensor<HRType>(App, "HR Sensor", Decimation);
	AgentHandle BRSensor = createSensor<BRType>(App, "BR Sensor", Decimation);
	AgentHandle SpO2Sensor =
	createSensor<SpO2Type>(App, "SpO2 Sensor", Decimation);
	AgentHandle BPSysSensor =
	createSensor<BPSysType>(App, "BPSys Sensor", Decimation);
	AgentHandle BodyTempSensor =
	createSensor<BodyTempType>(App, "BodyTemp Sensor", Decimation);

	//
	// Create functionalities.
	//
	LOG_INFO("Creating Functionalities for Agents.");

	//
	// Define abstractions.
	//

	RangeAbstraction<HRType, WarningScore> HRAbstraction(
	{{{0, 40}, Emergency},
	{{40, 51}, High},
	{{51, 60}, Low},
	{{60, 100}, No},
	{{100, 110}, Low},
	{{110, 129}, High},
	{{129, 200}, Emergency}},
	Emergency);

	RangeAbstraction<BRType, WarningScore> BRAbstraction({{{0, 9}, High},
	{{9, 14}, No},
	{{14, 20}, Low},
	{{20, 29}, High},
	{{29, 50}, Emergency}},
	Emergency);

	RangeAbstraction<SpO2Type, WarningScore> SpO2Abstraction(
	{{{1, 85}, Emergency},
	{{85, 90}, High},
	{{90, 95}, Low},
	{{95, 100}, No}},
	Emergency);

	RangeAbstraction<BPSysType, WarningScore> BPSysAbstraction(
	{{{0, 70}, Emergency},
	{{70, 81}, High},
	{{81, 101}, Low},
	{{101, 149}, No},
	{{149, 169}, Low},
	{{169, 179}, High},
	{{179, 200}, Emergency}},
	Emergency);

	RangeAbstraction<BodyTempType, WarningScore> BodyTempAbstraction(
	{{{0.f, 28.f}, Emergency},
	{{28.f, 32.f}, High},
	{{32.f, 35.f}, Low},
	{{35.f, 38.f}, No},
	{{38.f, 39.5f}, High},
	{{39.5f, 100.f}, Emergency}},
	Emergency);

	//
	// Define reliabilities.
	//

	ReliabilityAndConfidenceCombination<HRType, WarningScore, ReliabilityType>
	HRReliability;
	HRReliability.setTimeStep(1);

	std::shared_ptr<Abstraction<HRType, ReliabilityType>> HRAbsRel(
	new HRParFun({{{0, 200}, std::make_shared<HRLinFun>(1, 0)},
	{{200, 300}, std::make_shared<HRLinFun>(200, 1, 300, 0)}},
	0));
	HRReliability.setAbsoluteReliabilityFunction(HRAbsRel);

	std::shared_ptr<Abstraction<HRType, ReliabilityType>> HRRelSlope(new HRParFun(
	{{{-200, -100}, std::make_shared<HRLinFun>(-200, 0, -100, 1)},
	{{-100, 100}, std::make_shared<HRLinFun>(1, 0)},
	{{100, 200}, std::make_shared<HRLinFun>(100, 1, 200, 0)}},
	0));
	HRReliability.setReliabilitySlopeFunction(HRRelSlope);

	ReliabilityAndConfidenceCombination<BRType, WarningScore, ReliabilityType>
	BRReliability;
	BRReliability.setTimeStep(1);

	std::shared_ptr<Abstraction<BRType, ReliabilityType>> BRAbsRel(
	new BRParFun({{{0, 40}, std::make_shared<BRLinFun>(1, 0)},
	{{40, 60}, std::make_shared<BRLinFun>(40, 1, 60, 0)}},
	0));
	BRReliability.setAbsoluteReliabilityFunction(BRAbsRel);

	std::shared_ptr<Abstraction<BRType, ReliabilityType>> BRRelSlope(
	new BRParFun({{{-30, -20}, std::make_shared<BRLinFun>(-30, 0, -20, 1)},
	{{-20, 20}, std::make_shared<BRLinFun>(1, 0)},
	{{20, 30}, std::make_shared<BRLinFun>(20, 1, 30, 0)}},
	0));
	BRReliability.setReliabilitySlopeFunction(BRRelSlope);

	ReliabilityAndConfidenceCombination<SpO2Type, WarningScore, ReliabilityType>
	SpO2Reliability;
	SpO2Reliability.setTimeStep(1);

	std::shared_ptr<Abstraction<SpO2Type, ReliabilityType>> SpO2AbsRel(
	new SpO2ParFun(
	{
	{{0, 100}, std::make_shared<SpO2LinFun>(1, 0)},
	},
	0));
	SpO2Reliability.setAbsoluteReliabilityFunction(SpO2AbsRel);

	std::shared_ptr<Abstraction<SpO2Type, ReliabilityType>> SpO2RelSlope(
	new SpO2ParFun({{{-8, -5}, std::make_shared<SpO2LinFun>(-8, 0, -5, 1)},
	{{-5, 5}, std::make_shared<SpO2LinFun>(1, 0)},
	{{5, 8}, std::make_shared<SpO2LinFun>(5, 1, 8, 0)}},
	0));
	SpO2Reliability.setReliabilitySlopeFunction(SpO2RelSlope);

	ReliabilityAndConfidenceCombination<BPSysType, WarningScore, ReliabilityType>
	BPSysReliability;
	BPSysReliability.setTimeStep(1);

	std::shared_ptr<Abstraction<BPSysType, ReliabilityType>> BPSysAbsRel(
	new BPSysParFun(
	{{{0, 260}, std::make_shared<BPSysLinFun>(1, 0)},
	{{260, 400}, std::make_shared<BPSysLinFun>(260, 1, 400, 0)}},
	0));
	BPSysReliability.setAbsoluteReliabilityFunction(BPSysAbsRel);

	std::shared_ptr<Abstraction<BPSysType, ReliabilityType>> BPSysRelSlope(
	new BPSysParFun(
	{{{-100, -50}, std::make_shared<BPSysLinFun>(-100, 0, -50, 1)},
	{{-50, 50}, std::make_shared<BPSysLinFun>(1, 0)},
	{{50, 100}, std::make_shared<BPSysLinFun>(50, 1, 100, 0)}},
	0));
	BPSysReliability.setReliabilitySlopeFunction(BPSysRelSlope);

	ReliabilityAndConfidenceCombination<BodyTempType, WarningScore,
	ReliabilityType>
	BodyTempReliability;
	BodyTempReliability.setTimeStep(1);

	std::shared_ptr<Abstraction<BodyTempType, ReliabilityType>> BodyTempAbsRel(
	new BodyTempParFun(
	{{{-70.f, -50.f},
	std::make_shared<BodyTempLinFun>(-70.f, 0, -50.f, 1)},
	{{-50.f, 40.f}, std::make_shared<BodyTempLinFun>(1, 0)},
	{{40.f, 60.f}, std::make_shared<BodyTempLinFun>(40.f, 1, 60.f, 0)}},
	0));
	BodyTempReliability.setAbsoluteReliabilityFunction(BodyTempAbsRel);

	std::shared_ptr<Abstraction<BodyTempType, ReliabilityType>> BodyTempRelSlope(
	new BodyTempParFun(
	{{{-0.1f, -0.05f},
	std::make_shared<BodyTempLinFun>(-0.1f, 0, -0.05f, 1)},
	{{-0.05f, 0.05f}, std::make_shared<BodyTempLinFun>(1, 0)},
	{{0.05f, 0.1f},
	std::make_shared<BodyTempLinFun>(0.05f, 1, 0.1f, 0)}},
	0));
	BodyTempReliability.setReliabilitySlopeFunction(BodyTempRelSlope);

	//
	// Create low-level application agents with \c createLowLevelAgent.
	//
	LOG_INFO("Creating low-level agents.");

	AgentHandle HRAgent = createLowLevelAgent(App, "HR Agent", Decimation,
	HRAbstraction, HRReliability);
	AgentHandle BRAgent = createLowLevelAgent(App, "BR Agent", Decimation,
	BRAbstraction, BRReliability);
	AgentHandle SpO2Agent = createLowLevelAgent(App, "SpO2 Agent", Decimation,
	SpO2Abstraction, SpO2Reliability);
	AgentHandle BPSysAgent = createLowLevelAgent(
	App, "BPSys Agent", Decimation, BPSysAbstraction, BPSysReliability);
	AgentHandle BodyTempAgent =
	createLowLevelAgent(App, "BodyTemp Agent", Decimation,
	BodyTempAbstraction, BodyTempReliability);

	//
	// Connect sensors to low-level agents.
	//
	LOG_INFO("Connect sensors to their corresponding low-level agents.");

	App->connectSensor(HRAgent, 0, HRSensor, "HR Sensor Channel");
	App->connectSensor(BRAgent, 0, BRSensor, "BR Sensor Channel");
	App->connectSensor(SpO2Agent, 0, SpO2Sensor, "SpO2 Sensor Channel");
	App->connectSensor(BPSysAgent, 0, BPSysSensor, "BPSys Sensor Channel");
	App->connectSensor(BodyTempAgent, 0, BodyTempSensor,
	"BodyTemp Sensor Channel");

	//
	// Create a high-level application agent.
	//
	LOG_INFO("Create high-level agent.");

	// Slave positions on BodyAgent.
	enum SlaveIndex : rosa::id_t {
	HRIdx = 0,
	BRIdx = 1,
	SpO2Idx = 2,
	BPSysIdx = 3,
	BodyTempIdx = 4
	};

	CrossCombinator<WarningScoreType, ReliabilityType> BodyCrossCombinator;
	BodyCrossCombinator.setCrossLikelinessParameter(1.5);

	using WarningLikelinessFun =
	LikelinessFunction<WarningScoreType, ReliabilityType>;

	std::shared_ptr<WarningLikelinessFun> BRCrossLikelinessFun(
	new WarningLikelinessFun(0.6));
	BodyCrossCombinator.addCrossLikelinessProfile(HRIdx, BRIdx,
	BRCrossLikelinessFun);
	BodyCrossCombinator.addCrossLikelinessProfile(BRIdx, HRIdx,
	BRCrossLikelinessFun);
	BodyCrossCombinator.addCrossLikelinessProfile(BRIdx, SpO2Idx,
	BRCrossLikelinessFun);
	BodyCrossCombinator.addCrossLikelinessProfile(BRIdx, BPSysIdx,
	BRCrossLikelinessFun);
	BodyCrossCombinator.addCrossLikelinessProfile(BRIdx, BodyTempIdx,
	BRCrossLikelinessFun);
	BodyCrossCombinator.addCrossLikelinessProfile(SpO2Idx, BRIdx,
	BRCrossLikelinessFun);
	BodyCrossCombinator.addCrossLikelinessProfile(BPSysIdx, BRIdx,
	BRCrossLikelinessFun);
	BodyCrossCombinator.addCrossLikelinessProfile(BodyTempIdx, BRIdx,
	BRCrossLikelinessFun);

	std::shared_ptr<WarningLikelinessFun> HRBPCrossLikelinessFun(
	new WarningLikelinessFun(2.5));
	BodyCrossCombinator.addCrossLikelinessProfile(HRIdx, BPSysIdx,
	HRBPCrossLikelinessFun);
	BodyCrossCombinator.addCrossLikelinessProfile(BPSysIdx, HRIdx,
	HRBPCrossLikelinessFun);

	// The new agent logs its input values and results in a pair of the sum of
	// received warning scores and their cross-reliability.
	AgentHandle BodyAgent = App->createAgent(
	"Body Agent",
	std::function<Optional<WarningValue>(
	std::pair<WarningValue, bool>, std::pair<WarningValue, bool>,
	std::pair<WarningValue, bool>, std::pair<WarningValue, bool>,
	std::pair<WarningValue, bool>)>(
	[&](std::pair<WarningValue, bool> HR,
	std::pair<WarningValue, bool> BR,
	std::pair<WarningValue, bool> SpO2,
	std::pair<WarningValue, bool> BPSys,
	std::pair<WarningValue, bool> BodyTemp)
	-> Optional<WarningValue> {
	LOG_INFO_STREAM << "\n*******\nBody Agent trigged with values:\n"
	<< (HR.second ? "<New>" : "<Old>")
	<< " HR result: " << PRINTABLE(HR.first) << "\n"
	<< (BR.second ? "<New>" : "<Old>")
	<< " BR result: " << PRINTABLE(BR.first) << "\n"
	<< (SpO2.second ? "<New>" : "<Old>")
	<< " SpO2 result: " << PRINTABLE(SpO2.first) << "\n"
	<< (BPSys.second ? "<New>" : "<Old>")
	<< " BPSys result: " << PRINTABLE(BPSys.first)
	<< "\n"
	<< (BodyTemp.second ? "<New>" : "<Old>")
	<< " BodyTemp result: " << PRINTABLE(BodyTemp.first)
	<< "\n******\n";

	using ValueType =
	std::tuple<rosa::id_t, WarningScoreType, ReliabilityType>;
	const std::vector<ValueType> SlaveValues{
	{HRIdx, std::get<0>(HR.first), std::get<1>(HR.first)},
	{BRIdx, std::get<0>(BR.first), std::get<1>(BR.first)},
	{SpO2Idx, std::get<0>(SpO2.first), std::get<1>(SpO2.first)},
	{BPSysIdx, std::get<0>(BPSys.first), std::get<1>(BPSys.first)},
	{BodyTempIdx, std::get<0>(BodyTemp.first),
	std::get<1>(BodyTemp.first)}};

	const ReliabilityType crossReliability =
	BodyCrossCombinator.getOutputLikeliness(SlaveValues);

	struct ScoreSum {
	void operator()(const ValueType &V) { ews += std::get<1>(V); }
	WarningScoreType ews{0};
	};
	const ScoreSum scoreSum = std::for_each(
	SlaveValues.cbegin(), SlaveValues.cend(), ScoreSum());

	return {WarningValue(scoreSum.ews, crossReliability)};
	}));
	App->setExecutionPolicy(BodyAgent, AppExecutionPolicy::decimation(Decimation));

	//
	// Connect low-level agents to the high-level agent.
	//
	LOG_INFO("Connect low-level agents to the high-level agent.");

	App->connectAgents(BodyAgent, HRIdx, HRAgent, "HR Agent Channel");
	App->connectAgents(BodyAgent, BRIdx, BRAgent, "BR Agent Channel");
	App->connectAgents(BodyAgent, SpO2Idx, SpO2Agent, "SpO2 Agent Channel");
	App->connectAgents(BodyAgent, BPSysIdx, BPSysAgent, "BPSys Agent Channel");
	App->connectAgents(BodyAgent, BodyTempIdx, BodyTempAgent,
	"BodyTemp Agent Channel");

	//
	// For simulation output, create a logger agent writing the output of the
	// high-level agent into a CSV file.
	//
	LOG_INFO("Create a logger agent.");

	// Create CSV writer.
	std::ofstream ScoreCSV(ScoreCSVPath);
	csv::CSVTupleWriter<WarningScoreType, ReliabilityType>
	ScoreWriter(ScoreCSV, CSVDelimiter);
	if (CSVHeader) {
	ScoreWriter.writeHeader({"EWS", "Reliability"});
	}

	// The agent writes each new input value into a CSV file and produces nothing.
	// \note The execution of the logger is not subject to decimation.
	using logger_result = AppTuple<unit_t>;
	AgentHandle LoggerAgent = App->createAgent(
	"Logger Agent",
	std::function<Optional<logger_result>(std::pair<WarningValue, bool>)>(
	[&ScoreWriter](
	std::pair<WarningValue, bool> Score) -> Optional<logger_result> {
	// The state of \p ScoreWriter is not checked, expecting good.
	ScoreWriter << Score.first;
	return {};
	}));

	//
	// Connect the high-level agent to the logger agent.
	//
	LOG_INFO("Connect the high-level agent to the logger agent.");

	App->connectAgents(LoggerAgent, 0, BodyAgent, "Body Agent Channel");

	//
	// Do simulation.
	//
	LOG_INFO("Setting up and performing simulation.");

	//
	// Initialize application for simulation.
	//

	App->initializeSimulation();

	//
	// Open CSV files and register them for their corresponding sensors.
	//

	// Type aliases for iterators.
	using CSVDataIterator =
	CSVIterator<HRType, BRType, SpO2Type, BPSysType, BodyTempType>;
	const auto CSVHeaderInfo =
	CSVHeader ? HeaderInformation::HasHeader : HeaderInformation::HasNoHeader;
	std::ifstream DataCSV(DataCSVPath);
	auto [HRRange, BRRange, SpO2Range, BPSysRange, BodyTempRange] =
	splitTupleIterator(
	CSVDataIterator(DataCSV, 0, CSVHeaderInfo, CSVDelimiter),
	CSVDataIterator());

	App->registerSensorValues(HRSensor, std::move(begin(HRRange)), end(HRRange));
	App->registerSensorValues(BRSensor, std::move(begin(BRRange)), end(BRRange));
	App->registerSensorValues(SpO2Sensor, std::move(begin(SpO2Range)),
	end(SpO2Range));
	App->registerSensorValues(BPSysSensor, std::move(begin(BPSysRange)),
	end(BPSysRange));
	App->registerSensorValues(BodyTempSensor, std::move(begin(BodyTempRange)),
	end(BodyTempRange));

	//
	// Simulate.
	//

	App->simulate(NumberOfSimulationCycles);

	return 0;
	}

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