#ifndef NMCALCULATIONAUTOFITLM_H
#define NMCALCULATIONAUTOFITLM_H

#include <QObject>
#include <QVector>
#include <QPointF>
#include <QString>
#include <QStringList>
#include <QFile>
#include <limits>

#include "nmCalculation_global.h"

class nmDataWellBase;

// 双对数曲线误差分解。total 是 LM 候选接受和排序的唯一依据，
// 其余诊断量用于有限差分灵敏度分析和信赖域选参。
struct AutoFitObjectiveBreakdownLM {
	bool valid;
	double total;
	double pressureLoss;
	double derivativeLoss;
	QVector<double> residualVector;
	double verticalCommonBias;
	double verticalLoss;
	bool verticalReliable;
	double horizontalPhysicalShift;
	double horizontalLoss;
	bool horizontalReliable;
	bool registrationAmbiguous;
	double shapeLoss;
	double lateDerivativeSlopeBias;
	double lateDerivativeTrendLoss;
	bool lateDerivativeTrendReliable;
	double coverage;

	AutoFitObjectiveBreakdownLM()
		: valid(false)
		, total(1.0e10)
		, pressureLoss(std::numeric_limits<double>::quiet_NaN())
		, derivativeLoss(std::numeric_limits<double>::quiet_NaN())
		, verticalCommonBias(std::numeric_limits<double>::quiet_NaN())
		, verticalLoss(std::numeric_limits<double>::quiet_NaN())
		, verticalReliable(false)
		, horizontalPhysicalShift(std::numeric_limits<double>::quiet_NaN())
		, horizontalLoss(std::numeric_limits<double>::quiet_NaN())
		, horizontalReliable(false)
		, registrationAmbiguous(false)
		, shapeLoss(std::numeric_limits<double>::quiet_NaN())
		, lateDerivativeSlopeBias(std::numeric_limits<double>::quiet_NaN())
		, lateDerivativeTrendLoss(std::numeric_limits<double>::quiet_NaN())
		, lateDerivativeTrendReliable(false)
		, coverage(std::numeric_limits<double>::quiet_NaN())
	{}
};

// 有限差分 + LM/信赖域拟合的停止原因。
enum StopReasonLM {
	LM_CONTINUE_OPTIMIZATION = 0,
	LM_TARGET_ACHIEVED = 1,
	LM_TRUE_CONVERGENCE = 2,
	LM_LOCAL_OPTIMUM = 3,
	LM_MAX_ITERATIONS = 4,
	LM_USER_STOPPED = 5,
	LM_CONSECUTIVE_FAILURES = 6,
	LM_OPTIMIZATION_FAILED = 7
};

class NMCALCULATION_EXPORT nmCalculationAutoFitLM : public QObject
{
	Q_OBJECT

public:
	explicit nmCalculationAutoFitLM(QObject* parent = 0);
	~nmCalculationAutoFitLM();

	void setTargetLogLogData(const QVector<QVector<double> >& targetData);
	bool startAutoFitting();
	void stopFitting();
	QVector<double> getBestSolution() const;
	double getBestFitness() const;
	AutoFitObjectiveBreakdownLM getLastObjectiveBreakdown() const;
	QString getLastError() const;
	bool isRunning() const;
	int getCurrentIteration() const;
	int getTotalEvaluations() const;
	void resetOptimizer();
	void setTargetWellName(const QString& wellName);

signals:
	void progressUpdated(int iteration, double bestFitness);
	void fittingFinished(bool success, const QString& message);
	void bestCurveUpdated(QVector<QVector<double> > targetData,
		QVector<QVector<double> > bestData,
		int iteration,
		double fitness);
	void logMessageGenerated(const QString& message);

private:
	void initializeTemporaryDirectory();
	void cleanupTemporaryDirectory();
	bool removeDirectoryRecursively(const QString& path);
	void cleanupOldTemporaryDirectories();

	bool loadAllConfigFromDataManager();
	void loadOptimizationConfig();
	void loadParameterBounds();
	void extractUserInitialValues();

	// 有限差分 + LM/信赖域核心算法。
	StopReasonLM runTrustRegionFitting();
	bool evaluateTrustRegionPoint(const QVector<double>& parameters,
		double* fitness,
		AutoFitObjectiveBreakdownLM* breakdown,
		QVector<QVector<double> >* curve,
		int* elapsedMs);
	double evaluateFitness(const QVector<double>& parameters);

	void applyParametersToDataManager(const QVector<double>& parameters);
	void updateReservoirParameters(const QVector<double>& parameters);
	void updateWellParameters(const QVector<double>& parameters);
	void updateWellToDataManager(nmDataWellBase* pWell);

	QVector<QVector<double> > runSolver();
	QVector<QVector<double> > runSolverDll();
	bool runFinalFullSolver();
	void saveOptimizationResult();
	void validateAndProtectFinalResult();
	QString getStopReasonDescription(StopReasonLM reason) const;
	int getEnabledParameterCount() const;

	// LM 运行轨迹。
	void initializeTraceFile();
	void closeTraceFile();
	void writeTraceHeader();
	void writeTraceMetaFile();
	void writeTraceRow(int iteration,
		int parameterIndex,
		const QString& phase,
		const QVector<double>& parameters,
		double solverObjective,
		bool solverSuccess,
		int elapsedMs,
		const QString& decision,
		const AutoFitObjectiveBreakdownLM* objectiveBreakdown = nullptr);
	QVector<double> buildTraceParameterVector(const QVector<double>& selectedParameters) const;
	void emitRunSummary(bool success, StopReasonLM finalReason);

	bool validateParameters(const QVector<double>& parameters) const;
	bool validateLogLogData(const QVector<QVector<double> >& logLogData) const;
	bool validateInitialValues() const;
	bool validateSolverResult(const QVector<QVector<double> >& result) const;
	double calculateLogLogCurveError(const QVector<QVector<double> >& target,
		const QVector<QVector<double> >& result) const;

private:
	bool m_isRunning;
	bool m_shouldStop;
	int m_currentIteration;
	QString m_lastError;

	QVector<double> m_initialValues;
	QVector<double> m_globalBestPosition;
	double m_globalBestFitness;
	AutoFitObjectiveBreakdownLM m_globalBestObjectiveBreakdown;
	QVector<QVector<double> > m_lastEvaluatedLogLogData;
	QVector<QVector<double> > m_globalBestLogLogData;
	mutable AutoFitObjectiveBreakdownLM m_lastObjectiveBreakdown;
	QVector<QVector<double> > m_userInitialLogLogData;
	AutoFitObjectiveBreakdownLM m_userInitialObjectiveBreakdown;

	// 参数索引：0 k，1 skin，2 wellboreC，3 phi，4 h，5 Ct，
	// 6 Cf，7 Swi，8 Dfc，9 fractureHalfLength。
	QVector<bool> m_parameterSelected;
	QVector<double> m_parameterLower;
	QVector<double> m_parameterUpper;
	QVector<int> m_enabledParamIndices;
	QVector<QVector<double> > m_targetLogLogData;
	QString m_targetWellName;

	int m_maxIterations;
	double m_targetError;
	int m_totalEvaluations;
	int m_successfulEvaluations;

	volatile int m_evaluationInProgress;
	int m_consecutiveFailures;
	int m_maxConsecutiveFailures;

	QVector<double> m_userInitialSolution;
	double m_userInitialFitness;
	bool m_hasValidUserSolution;

	QString m_tempDirectory;
	QString m_traceRunId;
	QString m_traceFilePath;
	QString m_traceMetaFilePath;
	QFile m_traceFile;
};

#endif // NMCALCULATIONAUTOFITLM_H