/*---------------------------------------------------------------------------*\
  =========                 |
  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
   \\    /   O peration     | Website:  https://openfoam.org
    \\  /    A nd           | Copyright (C) 2011-2019 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/>.

Class
    Foam::Function1

Description
    Top level data entry class for use in dictionaries. Provides a mechanism
    to specify a variable as a certain type, e.g. constant or table, and
    provide functions to return the (interpolated) value, and integral between
    limits.

SourceFiles
    Function1.C
    Function1New.C

\*---------------------------------------------------------------------------*/

#ifndef Function1_H
#define Function1_H

#include "dictionary.H"
#include "Field.H"

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

namespace Foam
{

// Forward declarations
class Time;

// Forward declaration of friend functions and operators
template<class Type> class Function1;
template<class Type> Ostream& operator<<(Ostream&, const Function1<Type>&);

/*---------------------------------------------------------------------------*\
                          Class Function1 Declaration
\*---------------------------------------------------------------------------*/

template<class Type>
class Function1
:
    public tmp<Function1<Type>>::refCount
{

protected:

    // Protected data

        //- Name of entry
        const word name_;


public:

    typedef Type returnType;

    //- Runtime type information
    TypeName("Function1")

    //- Declare runtime constructor selection table
    declareRunTimeSelectionTable
    (
        autoPtr,
        Function1,
        dictionary,
        (
            const word& entryName,
            const dictionary& dict
        ),
        (entryName, dict)
    );


    // Constructors

        //- Construct from entry name
        Function1(const word& entryName);

        //- Copy constructor
        Function1(const Function1<Type>& f1);

        //- Construct and return a clone
        virtual tmp<Function1<Type>> clone() const = 0;


    //- Selector
    static autoPtr<Function1<Type>> New
    (
        const word& entryName,
        const dictionary& dict
    );


    //- Destructor
    virtual ~Function1();


    // Member Functions

        // Access

            //- Return the name of the entry
            const word& name() const;


        // Manipulation

            //- Convert time
            virtual void convertTimeBase(const Time& t);


        // Evaluation

            //- Return value as a function of (scalar) independent variable
            virtual Type value(const scalar x) const;

            //- Return value as a function of (scalar) independent variable
            virtual tmp<Field<Type>> value(const scalarField& x) const = 0;

            //- Integrate between two (scalar) values
            virtual Type integrate(const scalar x1, const scalar x2) const;

            //- Integrate between two (scalar) values
            virtual tmp<Field<Type>> integrate
            (
                const scalarField& x1,
                const scalarField& x2
            ) const = 0;


        // I/O

            //- Ostream Operator
            friend Ostream& operator<< <Type>
            (
                Ostream& os,
                const Function1<Type>& func
            );

            //- Write in dictionary format
            virtual void writeData(Ostream& os) const;


    // Member Operators

        //- Disallow default bitwise assignment
        void operator=(const Function1<Type>&) = delete;
};


template<class Type>
void writeEntry(Ostream& os, const Function1<Type>& f1);


/*---------------------------------------------------------------------------*\
                        Class FieldFunction1 Declaration
\*---------------------------------------------------------------------------*/

template<class Function1Type>
class FieldFunction1
:
    public Function1Type
{

public:

    typedef typename Function1Type::returnType Type;


    // Constructors

        //- Construct from entry name and dictionary
        FieldFunction1(const word& entryName, const dictionary& dict);

        //- Construct and return a clone
        virtual tmp<Function1<Type>> clone() const;


    //- Destructor
    virtual ~FieldFunction1()
    {}


    // Member Functions

        // Evaluation

            using Function1Type::value;
            using Function1Type::integrate;

            //- Return value as a function of (scalar) independent variable
            virtual tmp<Field<Type>> value(const scalarField& x) const;

            //- Integrate between two (scalar) values
            virtual tmp<Field<Type>> integrate
            (
                const scalarField& x1,
                const scalarField& x2
            ) const;
};


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

} // End namespace Foam

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

#define makeFunction1(Type)                                                    \
                                                                               \
    defineNamedTemplateTypeNameAndDebug(Function1<Type>, 0);                   \
                                                                               \
    defineTemplateRunTimeSelectionTable                                        \
    (                                                                          \
        Function1<Type>,                                                       \
        dictionary                                                             \
    );


#define makeFunction1Type(SS, Type)                                            \
                                                                               \
    defineNamedTemplateTypeNameAndDebug(Function1Types::SS<Type>, 0);          \
                                                                               \
    Function1<Type>::adddictionaryConstructorToTable                           \
        <FieldFunction1<Function1Types::SS<Type>>>                             \
        add##SS##Type##ConstructorToTable_;


#define makeScalarFunction1(SS)                                                \
                                                                               \
    defineTypeNameAndDebug(SS, 0);                                             \
                                                                               \
    Function1<scalar>::adddictionaryConstructorToTable<FieldFunction1<SS>>     \
        add##SS##ConstructorToTable_;


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

#ifdef NoRepository
    #include "Function1.C"
    #include "Constant.H"
#endif

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

#endif

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