/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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 * This file is part of the LibreOffice project.
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 *
 * This file incorporates work covered by the following license notice:
 *
 *   Licensed to the Apache Software Foundation (ASF) under one or more
 *   contributor license agreements. See the NOTICE file distributed
 *   with this work for additional information regarding copyright
 *   ownership. The ASF licenses this file to you under the Apache
 *   License, Version 2.0 (the "License"); you may not use this file
 *   except in compliance with the License. You may obtain a copy of
 *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
 */
#ifndef INCLUDED_CHART2_SOURCE_INC_REGRESSIONCURVECALCULATOR_HXX
#define INCLUDED_CHART2_SOURCE_INC_REGRESSIONCURVECALCULATOR_HXX

#include <cppuhelper/implbase.hxx>
#include <rtl/ustrbuf.hxx>

#include <com/sun/star/chart2/XRegressionCurveCalculator.hpp>

namespace com::sun::star::util { class XNumberFormatsSupplier; }
namespace com::sun::star::util { class XNumberFormatter; }

namespace chart
{

class RegressionCurveCalculator : public
    cppu::WeakImplHelper< css::chart2::XRegressionCurveCalculator >
{
public:
    RegressionCurveCalculator();
    virtual ~RegressionCurveCalculator() override;

    static bool isLinearScaling(
        const css::uno::Reference< css::chart2::XScaling >& xScaling );

    static bool isLogarithmicScaling(
        const css::uno::Reference< css::chart2::XScaling >& xScaling );

protected:
    virtual OUString ImplGetRepresentation(
        const css::uno::Reference< css::util::XNumberFormatter >& xNumFormatter,
        sal_Int32 nNumberFormatKey, sal_Int32* pFormulaLength = nullptr ) const = 0;

    static OUString getFormattedString(
        const css::uno::Reference< css::util::XNumberFormatter >& xNumFormatter,
        sal_Int32 nNumberFormatKey,
        double fNumber,
        const sal_Int32* pStringLength );

    static void addStringToEquation( OUStringBuffer& aStrEquation, sal_Int32& nLineLength, OUStringBuffer const & aAddString, const sal_Int32* pMaxLength );

    double m_fCorrelationCoefficient;

    sal_Int32 mDegree;
    bool  mForceIntercept;
    double    mInterceptValue;
    sal_Int32 mPeriod;
    OUString mXName, mYName;

    // ____ XRegressionCurveCalculator ____
    virtual void SAL_CALL setRegressionProperties(
        sal_Int32 aDegree,
        sal_Bool  aForceIntercept,
        double    aInterceptValue,
        sal_Int32 aPeriod) override;

    virtual void SAL_CALL recalculateRegression(
        const css::uno::Sequence< double >& aXValues,
        const css::uno::Sequence< double >& aYValues ) override = 0;

    virtual double SAL_CALL getCurveValue( double x ) override = 0;

    virtual css::uno::Sequence< css::geometry::RealPoint2D > SAL_CALL getCurveValues(
        double min,
        double max,
        sal_Int32 nPointCount,
        const css::uno::Reference< css::chart2::XScaling >& xScalingX,
        const css::uno::Reference< css::chart2::XScaling >& xScalingY,
        sal_Bool bMaySkipPointsInCalculation ) override;

    virtual double SAL_CALL getCorrelationCoefficient() override;

    virtual OUString SAL_CALL getRepresentation() override;

    virtual OUString SAL_CALL getFormattedRepresentation(
        const css::uno::Reference< css::util::XNumberFormatsSupplier >& xNumFmtSupplier,
        sal_Int32 nNumberFormatKey, sal_Int32 nFormulaLength ) override;

    virtual void SAL_CALL setXYNames(
        const OUString& aXName, const OUString& aYName ) override;
};

} //  namespace chart

// INCLUDED_CHART2_SOURCE_INC_REGRESSIONCURVECALCULATOR_HXX
#endif

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