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/*---------------------------------------------------------------------------*\
  =========                 |
  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
   \\    /   O peration     | Website:  https://openfoam.org
    \\  /    A nd           | Copyright (C) 2011-2026 OpenFOAM Foundation
     \\/     M anipulation  |
-------------------------------------------------------------------------------
License
    This file is part of OpenFOAM.
    OpenFOAM 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.
    OpenFOAM 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
    for more details.
    You should have received a copy of the GNU General Public License
    along with OpenFOAM.  If not, see <http://www.gnu.org/licenses/>.
\*---------------------------------------------------------------------------*/

#include "Polynomial1.H"

// * * * * * * * * * * * * * Private Member Functions  * * * * * * * * * * * //

template<class Type>
Foam::List<Type> Foam::Function1s::Polynomial<Type>::convertRead
(
    const unitSets& units,
    List<Type> coeffs
)
{
    unitSet unitsXPowI(units.x);
    forAll(coeffs, i)
    {
        coeffs[i] = units.value.toStandard(unitsXPowI.toUser(coeffs[i]));
        unitsXPowI.reset(units.x*unitsXPowI);
    }
    return coeffs;
}


template<class Type>
Foam::List<Type> Foam::Function1s::Polynomial<Type>::convertWrite
(
    const unitSets& units,
    List<Type> coeffs
)
{
    unitSet unitsXPowI(units.x);
    forAll(coeffs, i)
    {
        coeffs[i] = units.value.toUser(unitsXPowI.toStandard(coeffs[i]));
        unitsXPowI.reset(units.x*unitsXPowI);
    }
    return coeffs;
}


// * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //

template<class Type>
Foam::Function1s::Polynomial<Type>::Polynomial
(
    const word& name,
    const unitSets& units,
    const dictionary& dict
)
:
    FieldFunction1<Type, Polynomial<Type>>(name),
    coeffs_
    (
        convertRead
        (
            dict.found("units")
          ? Function1s::unitSets(dict.lookup("units"))
          : units,
            dict.lookup("coeffs")
        )
    )
{
    if (!coeffs_.size())
    {
        FatalIOErrorInFunction(dict)
            << typeName.capitalise() << ' ' << name
            << " must have at least one coefficient"
            << exit(FatalError);
    }
}


template<class Type>
Foam::Function1s::Polynomial<Type>::Polynomial
(
    const word& name,
    const unitSets& units,
    Istream& is
)
:
    FieldFunction1<Type, Polynomial<Type>>(name),
    coeffs_(convertRead(units, is))
{
    if (!coeffs_.size())
    {
        FatalIOErrorInFunction(is)
            << typeName.capitalise() << ' ' << name
            << " must have at least one coefficient"
            << exit(FatalError);
    }
}


template<class Type>
Foam::Function1s::Polynomial<Type>::Polynomial(const Polynomial& poly)
:
    FieldFunction1<Type, Polynomial<Type>>(poly),
    coeffs_(poly.coeffs_)
{}


// * * * * * * * * * * * * * * * * Destructor  * * * * * * * * * * * * * * * //

template<class Type>
Foam::Function1s::Polynomial<Type>::~Polynomial()
{}


// * * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * //

template<class Type>
Type Foam::Function1s::Polynomial<Type>::value(const scalar x) const
{
    Type y = coeffs_[coeffs_.size() - 1];

    for (label i = coeffs_.size() - 2; i >= 0; i --)
    {
        y = y*x + coeffs_[i];
    }

    return y;
}


template<class Type>
Type Foam::Function1s::Polynomial<Type>::derivative(const scalar x) const
{
    Type y = coeffs_[coeffs_.size() - 1]*(coeffs_.size() - 1);

    for (label i = coeffs_.size() - 2; i >= 1; i --)
    {
        y = y*x + coeffs_[i]*i;
    }

    return y;
}


template<class Type>
Type Foam::Function1s::Polynomial<Type>::integral
(
    const scalar x1,
    const scalar x2
) const
{
    Type Sy1 = coeffs_[coeffs_.size() - 1]/coeffs_.size(), Sy2 = Sy1;

    for (label i = coeffs_.size() - 2; i >= 0; i --)
    {
        Sy1 = Sy1*x1 + coeffs_[i]/(i + 1);
        Sy2 = Sy2*x2 + coeffs_[i]/(i + 1);
    }

    return x2*Sy2 - x1*Sy1;
}


template<class Type>
void Foam::Function1s::Polynomial<Type>::write
(
    Ostream& os,
    const unitSets& units
) const
{
    writeEntry(os, "coeffs", convertWrite(units, coeffs_));
}


// ************************************************************************* //

	/---------------------------------------------------------------------------\
	========= \|
	\\ / F ield \| OpenFOAM: The Open Source CFD Toolbox
	\\ / O peration \| Website: https://openfoam.org
	\\ / A nd \| Copyright (C) 2011-2026 OpenFOAM Foundation
	\\/ M anipulation \|
	-------------------------------------------------------------------------------
	License
	This file is part of OpenFOAM.

	OpenFOAM 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.

	OpenFOAM 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
	for more details.

	You should have received a copy of the GNU General Public License
	along with OpenFOAM. If not, see <http://www.gnu.org/licenses/>.

	\---------------------------------------------------------------------------/

	#include "Polynomial1.H"

	// * * * * * * * * * * * * * Private Member Functions * * * * * * * * * * * //

	template<class Type>
	Foam::List<Type> Foam::Function1s::Polynomial<Type>::convertRead
	(
	const unitSets& units,
	List<Type> coeffs
	)
	{
	unitSet unitsXPowI(units.x);
	forAll(coeffs, i)
	{
	coeffs[i] = units.value.toStandard(unitsXPowI.toUser(coeffs[i]));
	unitsXPowI.reset(units.x*unitsXPowI);
	}
	return coeffs;
	}


	template<class Type>
	Foam::List<Type> Foam::Function1s::Polynomial<Type>::convertWrite
	(
	const unitSets& units,
	List<Type> coeffs
	)
	{
	unitSet unitsXPowI(units.x);
	forAll(coeffs, i)
	{
	coeffs[i] = units.value.toUser(unitsXPowI.toStandard(coeffs[i]));
	unitsXPowI.reset(units.x*unitsXPowI);
	}
	return coeffs;
	}


	// * * * * * * * * * * * * * * * * Constructors * * * * * * * * * * * * * * //

	template<class Type>
	Foam::Function1s::Polynomial<Type>::Polynomial
	(
	const word& name,
	const unitSets& units,
	const dictionary& dict
	)
	:
	FieldFunction1<Type, Polynomial<Type>>(name),
	coeffs_
	(
	convertRead
	(
	dict.found("units")
	? Function1s::unitSets(dict.lookup("units"))
	: units,
	dict.lookup("coeffs")
	)
	)
	{
	if (!coeffs_.size())
	{
	FatalIOErrorInFunction(dict)
	<< typeName.capitalise() << ' ' << name
	<< " must have at least one coefficient"
	<< exit(FatalError);
	}
	}


	template<class Type>
	Foam::Function1s::Polynomial<Type>::Polynomial
	(
	const word& name,
	const unitSets& units,
	Istream& is
	)
	:
	FieldFunction1<Type, Polynomial<Type>>(name),
	coeffs_(convertRead(units, is))
	{
	if (!coeffs_.size())
	{
	FatalIOErrorInFunction(is)
	<< typeName.capitalise() << ' ' << name
	<< " must have at least one coefficient"
	<< exit(FatalError);
	}
	}


	template<class Type>
	Foam::Function1s::Polynomial<Type>::Polynomial(const Polynomial& poly)
	:
	FieldFunction1<Type, Polynomial<Type>>(poly),
	coeffs_(poly.coeffs_)
	{}


	// * * * * * * * * * * * * * * * * Destructor * * * * * * * * * * * * * * * //

	template<class Type>
	Foam::Function1s::Polynomial<Type>::~Polynomial()
	{}


	// * * * * * * * * * * * * * * * Member Functions * * * * * * * * * * * * * //

	template<class Type>
	Type Foam::Function1s::Polynomial<Type>::value(const scalar x) const
	{
	Type y = coeffs_[coeffs_.size() - 1];

	for (label i = coeffs_.size() - 2; i >= 0; i --)
	{
	y = y*x + coeffs_[i];
	}

	return y;
	}


	template<class Type>
	Type Foam::Function1s::Polynomial<Type>::derivative(const scalar x) const
	{
	Type y = coeffs_[coeffs_.size() - 1]*(coeffs_.size() - 1);

	for (label i = coeffs_.size() - 2; i >= 1; i --)
	{
	y = yx + coeffs_[i]i;
	}

	return y;
	}


	template<class Type>
	Type Foam::Function1s::Polynomial<Type>::integral
	(
	const scalar x1,
	const scalar x2
	) const
	{
	Type Sy1 = coeffs_[coeffs_.size() - 1]/coeffs_.size(), Sy2 = Sy1;

	for (label i = coeffs_.size() - 2; i >= 0; i --)
	{
	Sy1 = Sy1*x1 + coeffs_[i]/(i + 1);
	Sy2 = Sy2*x2 + coeffs_[i]/(i + 1);
	}

	return x2Sy2 - x1Sy1;
	}


	template<class Type>
	void Foam::Function1s::Polynomial<Type>::write
	(
	Ostream& os,
	const unitSets& units
	) const
	{
	writeEntry(os, "coeffs", convertWrite(units, coeffs_));
	}


	// ************************************************************************* //