// --------------------------------------------------------------------------
//                   OpenMS -- Open-Source Mass Spectrometry
// --------------------------------------------------------------------------
// Copyright The OpenMS Team -- Eberhard Karls University Tuebingen,
// ETH Zurich, and Freie Universitaet Berlin 2002-2018.
//
// This software is released under a three-clause BSD license:
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//    may be used to endorse or promote products derived from this software
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// --------------------------------------------------------------------------
// $Maintainer: Timo Sachsenberg $
// $Authors: $
// --------------------------------------------------------------------------
//

#include <OpenMS/COMPARISON/SPECTRA/SpectrumPrecursorComparator.h>
#include <OpenMS/KERNEL/MSSpectrum.h>
#include <OpenMS/KERNEL/MSExperiment.h>

using namespace std;

namespace OpenMS
{
  SpectrumPrecursorComparator::SpectrumPrecursorComparator() :
    PeakSpectrumCompareFunctor()
  {
    setName(SpectrumPrecursorComparator::getProductName());
    defaults_.setValue("window", 2, "Allowed deviation between precursor peaks.");
    defaultsToParam_();
  }

  SpectrumPrecursorComparator::SpectrumPrecursorComparator(const SpectrumPrecursorComparator & source) :
    PeakSpectrumCompareFunctor(source)
  {
  }

  SpectrumPrecursorComparator::~SpectrumPrecursorComparator()
  {
  }

  SpectrumPrecursorComparator & SpectrumPrecursorComparator::operator=(const SpectrumPrecursorComparator & source)
  {
    if (this != &source)
    {
      PeakSpectrumCompareFunctor::operator=(source);
    }
    return *this;
  }

  double SpectrumPrecursorComparator::operator()(const PeakSpectrum & spec) const
  {
    return operator()(spec, spec);
  }

  double SpectrumPrecursorComparator::operator()(const PeakSpectrum & x, const PeakSpectrum & y) const
  {
    double window = (double)param_.getValue("window");

    double mz1 = 0.0;
    if (!x.getPrecursors().empty())
      mz1 = x.getPrecursors()[0].getMZ();
    double mz2 = 0.0;
    if (!y.getPrecursors().empty())
      mz2 = y.getPrecursors()[0].getMZ();

    if (fabs(mz1 - mz2) > window)
    {
      return 0;
    }

    return window - fabs(mz1 - mz2);
  }

}
