/////////////////////////////////////////////////////////////////////////////////
//
//  Copyright (C) 2017     Statoil ASA
// 
//  ResInsight is free software: you can redistribute it and/or modify
//  it under the terms of the GNU General Public License as published by
//  the Free Software Foundation, either version 3 of the License, or
//  (at your option) any later version.
// 
//  ResInsight 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.
// 
//  See the GNU General Public License at <http://www.gnu.org/licenses/gpl.html> 
//  for more details.
//
/////////////////////////////////////////////////////////////////////////////////

#pragma once

#include "RiaCurveDataTools.h"
#include "RiaQDateTimeTools.h"

#include <QDateTime>

using QDT = RiaQDateTimeTools;

//==================================================================================================
/// 
//==================================================================================================
class RiaTimeHistoryCurveResampler
{
public:
    RiaTimeHistoryCurveResampler();

    void                                setCurveData(const std::vector<double>& values, 
                                                     const std::vector<time_t>& timeSteps);

    void                                resampleAndComputePeriodEndValues(DateTimePeriod period);
    void                                resampleAndComputeWeightedMeanValues(DateTimePeriod period);

    const std::vector<time_t>&          resampledTimeSteps() const;
    const std::vector<double>&          resampledValues() const;

    static std::vector<time_t>          timeStepsFromTimeRange(DateTimePeriod period, time_t minTime, time_t maxTime);

private:
    void                                computeWeightedMeanValues(DateTimePeriod period);
    void                                computePeriodEndValues(DateTimePeriod period);

    void            clearData();
    void            computeResampledTimeSteps(DateTimePeriod period);
    static QDateTime firstResampledTimeStep(const QDateTime& firstTimestep, DateTimePeriod period);
    inline double   interpolatedValue(time_t t, time_t t1, double v1, time_t t2, double v2);

private:
    std::pair<std::vector<double>, std::vector<time_t>> m_originalValues;

    std::vector<time_t>     m_timeSteps;
    std::vector<double>     m_values;
};