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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 "distribution.H"

// * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //

namespace Foam
{
    defineTypeNameAndDebug(distribution, 0);
    defineRunTimeSelectionTable(distribution, dictionary);
}


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

void Foam::distribution::validateBounds(const dictionary& dict) const
{
    if (max() < min())
    {
        FatalIOErrorInFunction(dict)
            << type() << ": The maximum value is smaller than the minimum "
            << "value:" << nl << "    max = " << max() << ", min = "
            << min() << abort(FatalIOError);
    }
}


void Foam::distribution::validatePositive(const dictionary& dict) const
{
    if (min() < 0)
    {
        FatalIOErrorInFunction(dict)
            << type() << ": The minimum value must be greater than "
            << "zero." << nl << "    min = " << min()
            << abort(FatalIOError);
    }
}


Foam::tmp<Foam::scalarField>
Foam::distribution::clipPDF
(
    const scalarField& x,
    const tmp<scalarField>& pdf
) const
{
    return pos0(x - min())*pos0(max() - x)*pdf;
}


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

Foam::distribution::distribution
(
    const word& name,
    const unitSet& units,
    const dictionary& dict,
    const label sampleQ,
    randomGenerator&& rndGen
)
:
    Q_(dict.lookup<scalar>("Q")),
    sampleQ_(sampleQ),
    rndGen_("rndGen", dict, std::move(rndGen))
{
    if (!dict.lookupOrDefault<bool>("allowNegativeQ", false) && Q_ < 0)
    {
        FatalIOErrorInFunction(dict)
            << name << ": Size exponent cannot be negative" << nl
            << "    Q = " << Q_ << abort(FatalIOError);
    }

    if (sampleQ_ < 0)
    {
        FatalErrorInFunction
            << name << ": Sampling size exponent cannot be negative" << nl
            << "    sampleQ = " << sampleQ_ << abort(FatalError);
    }
}


Foam::distribution::distribution
(
    const label Q,
    const label sampleQ,
    randomGenerator&& rndGen
)
:
    Q_(Q),
    sampleQ_(sampleQ),
    rndGen_(rndGen)
{}


Foam::distribution::distribution(const distribution& d, const label sampleQ)
:
    Q_(d.Q_),
    sampleQ_(sampleQ),
    rndGen_(d.rndGen_)
{}


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

Foam::distribution::~distribution()
{}


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

Foam::label Foam::distribution::sampleQ() const
{
    return sampleQ_;
}


void Foam::distribution::start(const bool restart) const
{
    rndGen_.start(restart);
}


Foam::tmp<Foam::scalarField>
Foam::distribution::CDF(const scalarField& x) const
{
    return integralPDFxPow(x, 0);
}


void Foam::distribution::write(Ostream& os, const unitSet& units) const
{
    writeEntry(os, "type", type());
    writeEntry(os, "Q", Q_);
}


void Foam::distribution::writeState(Ostream& os) const
{
    writeEntry(os, "rndGen", rndGen_);
}


Foam::tmp<Foam::scalarField> Foam::distribution::plotX(const label n) const
{
    const scalar x0 = min(), x1 = max(), d = 0.1*(x1 - x0);

    tmp<scalarField> tResult(new scalarField(n));
    scalarField& result = tResult.ref();

    result[0] = x0 - d;
    result[1] = x0*(1 - sign(x0)*small);
    result[2] = x0*(1 + sign(x0)*small);

    for (label i = 3; i < n - 3; ++ i)
    {
        const scalar f = scalar(i - 2)/(n - 5);

        result[i] = (1 - f)*x0 + f*x1;
    }

    result[n - 3] = x1*(1 - sign(x1)*small);
    result[n - 2] = x1*(1 + sign(x1)*small);
    result[n - 1] = x1 + d;

    return tResult;
}


// * * * * * * * * * * * * * * * Global Functions  * * * * * * * * * * * * * //

void Foam::writeEntry
(
    Ostream& os,
    const word& entryName,
    const dimensionSet& dimensions,
    const distribution& d,
    const bool write,
    const bool writeState
)
{
    writeEntry(os, entryName, units::any, d, write, writeState);
}


void Foam::writeEntry
(
    Ostream& os,
    const word& entryName,
    const unitSet& units,
    const distribution& d,
    const bool write,
    const bool writeState
)
{
    writeKeyword(os, entryName);

    os  << nl << indent << token::BEGIN_BLOCK << nl << incrIndent;

    if (write) d.write(os, units);
    if (writeState) d.writeState(os);

    os  << decrIndent << indent << token::END_BLOCK << endl;
}


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

	/---------------------------------------------------------------------------\
	========= \|
	\\ / 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 "distribution.H"

	// * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //

	namespace Foam
	{
	defineTypeNameAndDebug(distribution, 0);
	defineRunTimeSelectionTable(distribution, dictionary);
	}


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

	void Foam::distribution::validateBounds(const dictionary& dict) const
	{
	if (max() < min())
	{
	FatalIOErrorInFunction(dict)
	<< type() << ": The maximum value is smaller than the minimum "
	<< "value:" << nl << " max = " << max() << ", min = "
	<< min() << abort(FatalIOError);
	}
	}


	void Foam::distribution::validatePositive(const dictionary& dict) const
	{
	if (min() < 0)
	{
	FatalIOErrorInFunction(dict)
	<< type() << ": The minimum value must be greater than "
	<< "zero." << nl << " min = " << min()
	<< abort(FatalIOError);
	}
	}


	Foam::tmp<Foam::scalarField>
	Foam::distribution::clipPDF
	(
	const scalarField& x,
	const tmp<scalarField>& pdf
	) const
	{
	return pos0(x - min())pos0(max() - x)pdf;
	}


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

	Foam::distribution::distribution
	(
	const word& name,
	const unitSet& units,
	const dictionary& dict,
	const label sampleQ,
	randomGenerator&& rndGen
	)
	:
	Q_(dict.lookup<scalar>("Q")),
	sampleQ_(sampleQ),
	rndGen_("rndGen", dict, std::move(rndGen))
	{
	if (!dict.lookupOrDefault<bool>("allowNegativeQ", false) && Q_ < 0)
	{
	FatalIOErrorInFunction(dict)
	<< name << ": Size exponent cannot be negative" << nl
	<< " Q = " << Q_ << abort(FatalIOError);
	}

	if (sampleQ_ < 0)
	{
	FatalErrorInFunction
	<< name << ": Sampling size exponent cannot be negative" << nl
	<< " sampleQ = " << sampleQ_ << abort(FatalError);
	}
	}


	Foam::distribution::distribution
	(
	const label Q,
	const label sampleQ,
	randomGenerator&& rndGen
	)
	:
	Q_(Q),
	sampleQ_(sampleQ),
	rndGen_(rndGen)
	{}


	Foam::distribution::distribution(const distribution& d, const label sampleQ)
	:
	Q_(d.Q_),
	sampleQ_(sampleQ),
	rndGen_(d.rndGen_)
	{}


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

	Foam::distribution::~distribution()
	{}


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

	Foam::label Foam::distribution::sampleQ() const
	{
	return sampleQ_;
	}


	void Foam::distribution::start(const bool restart) const
	{
	rndGen_.start(restart);
	}


	Foam::tmp<Foam::scalarField>
	Foam::distribution::CDF(const scalarField& x) const
	{
	return integralPDFxPow(x, 0);
	}


	void Foam::distribution::write(Ostream& os, const unitSet& units) const
	{
	writeEntry(os, "type", type());
	writeEntry(os, "Q", Q_);
	}


	void Foam::distribution::writeState(Ostream& os) const
	{
	writeEntry(os, "rndGen", rndGen_);
	}


	Foam::tmp<Foam::scalarField> Foam::distribution::plotX(const label n) const
	{
	const scalar x0 = min(), x1 = max(), d = 0.1*(x1 - x0);

	tmp<scalarField> tResult(new scalarField(n));
	scalarField& result = tResult.ref();

	result[0] = x0 - d;
	result[1] = x0(1 - sign(x0)small);
	result[2] = x0(1 + sign(x0)small);

	for (label i = 3; i < n - 3; ++ i)
	{
	const scalar f = scalar(i - 2)/(n - 5);

	result[i] = (1 - f)x0 + fx1;
	}

	result[n - 3] = x1(1 - sign(x1)small);
	result[n - 2] = x1(1 + sign(x1)small);
	result[n - 1] = x1 + d;

	return tResult;
	}


	// * * * * * * * * * * * * * * * Global Functions * * * * * * * * * * * * * //

	void Foam::writeEntry
	(
	Ostream& os,
	const word& entryName,
	const dimensionSet& dimensions,
	const distribution& d,
	const bool write,
	const bool writeState
	)
	{
	writeEntry(os, entryName, units::any, d, write, writeState);
	}


	void Foam::writeEntry
	(
	Ostream& os,
	const word& entryName,
	const unitSet& units,
	const distribution& d,
	const bool write,
	const bool writeState
	)
	{
	writeKeyword(os, entryName);

	os << nl << indent << token::BEGIN_BLOCK << nl << incrIndent;

	if (write) d.write(os, units);
	if (writeState) d.writeState(os);

	os << decrIndent << indent << token::END_BLOCK << endl;
	}


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