/*---------------------------------------------------------------------------*\
  =========                 |
  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
   \\    /   O peration     | Website:  https://openfoam.org
    \\  /    A nd           | Copyright (C) 2021 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 "expInletFvPatchVectorField.H"
#include "addToRunTimeSelectionTable.H"
#include "fvPatchFieldMapper.H"
#include "volFields.H"
#include "surfaceFields.H"

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



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

Foam::expInletFvPatchVectorField::
expInletFvPatchVectorField
(
    const fvPatch& p,
    const DimensionedField<vector, volMesh>& iF
)
:
    fixedValueFvPatchVectorField(p, iF),
    meanVelocity_(0.0),
    n_(Zero),
    R_(Zero)
{
}


Foam::expInletFvPatchVectorField::
expInletFvPatchVectorField
(
    const fvPatch& p,
    const DimensionedField<vector, volMesh>& iF,
    const dictionary& dict
)
:
   //dict.lookup will look for these keywords in the input dictionary
    fixedValueFvPatchVectorField(p, iF),
    meanVelocity_(dict.lookup<scalar>("meanVelocity")),
    n_(pTraits<vector>(dict.lookup("n"))),
    R_(pTraits<vector>(dict.lookup("R")))
{


    fixedValueFvPatchVectorField::evaluate();
      if (mag(n_) < SMALL || mag(R_) < SMALL) {
        FatalErrorIn("expInletFvPatchVectorField(dict)")
        << "n and/or R given with zero  or close to zero."
        << abort(FatalError);   //Abort exeuction - solver will exit
      }   
    n_ /= mag(n_); //This is equivalent to n_ = n_/mag(n_)
    R_ /= mag(R_); //This is equivalent to R_ = R_/(mag(y_) 
    /*
    // Initialise with the value entry if evaluation is not possible
    fvPatchVectorField::operator=
    (
        vectorField("value", dict, p.size())
    );
    */
}


Foam::expInletFvPatchVectorField::
expInletFvPatchVectorField
(
    const expInletFvPatchVectorField& ptf,
    const fvPatch& p,
    const DimensionedField<vector, volMesh>& iF,
    const fvPatchFieldMapper& mapper
)
:
    fixedValueFvPatchVectorField(ptf, p, iF, mapper),
    meanVelocity_(ptf.meanVelocity_),
    n_(ptf.n_),
    R_(ptf.R_)
{}


Foam::expInletFvPatchVectorField::
expInletFvPatchVectorField
(
    const expInletFvPatchVectorField& ptf
)
:
    fixedValueFvPatchVectorField(ptf),
    meanVelocity_(ptf.meanVelocity_),
    n_(ptf.n_),
    R_(ptf.R_)
{}


Foam::expInletFvPatchVectorField::
expInletFvPatchVectorField
(
    const expInletFvPatchVectorField& ptf,
    const DimensionedField<vector, volMesh>& iF
)
:
    fixedValueFvPatchVectorField(ptf, iF),
    meanVelocity_(ptf.meanVelocity_),
    n_(ptf.n_),
    R_(ptf.R_)
{}


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

void Foam::expInletFvPatchVectorField::autoMap
(
    const fvPatchFieldMapper& m
)
{
    fixedValueFvPatchVectorField::autoMap(m);
}


void Foam::expInletFvPatchVectorField::rmap
(
    const fvPatchVectorField& ptf,
    const labelList& addr
)
{
    fixedValueFvPatchVectorField::rmap(ptf, addr);

    const expInletFvPatchVectorField& tiptf =
        refCast<const expInletFvPatchVectorField>(ptf);

}


void Foam::expInletFvPatchVectorField::updateCoeffs()
{
    if (updated())
    {
        return;
    }

    //Get dimensions of the bounding box: MIN and MAX points
    boundBox bb(patch().patch().localPoints(), true);
      
    //Calculate coordinates of centre point of the patch
    vector ctr = 0.5*(bb.max() + bb.min());
    vector Dh = (bb.max() - bb.min());

    //Access centre of the faces in the patch
    const vectorField& c = patch().Cf();

    //Computes scalar field to be used for defining the parabolic profile
    //& denotes dot product of two vectors in OpenFOAM
    scalarField coord = 2*((c - ctr) & R_)/(Dh & R_);

    fixedValueFvPatchVectorField::operator==
    (
     n_*meanVelocity_*(1.0 - sqr(coord))
    );
    
    fixedValueFvPatchVectorField::updateCoeffs();

    Info << endl << "Face centers (c):" << endl;
    Info << c << endl;
    Info << endl << "Patch center (ctr):" << endl;
    Info << ctr << endl;
    Info << endl << "Patch (c - ctr):" << endl;
    Info << c - ctr << endl;
    Info << endl << "Patch max bound (bb.max):" << endl;
    Info << bb.max() << endl;
    Info << endl << "Patch min bound (bb.max):" << endl;
    Info << bb.min() << endl;
    Info << endl << "Patch coord ( 2*((c - ctr) & R_)/((Dh & R_) ):" << endl;
    Info << coord << endl;
    Info << endl << "Patch ( 1.0 - sqr(coord)) :" << endl;
    Info << n_*meanVelocity_*(1.0 - sqr(coord))<< endl;
    Info << endl << "Loop for c, BC assigment" << endl;
    //for (int faceI=0; Cf.size()<faceI; faceI++) {
    forAll(c, faceI) {
      Info << c[faceI] << " " << n_*meanVelocity_*(1.0 - sqr(coord[faceI])) << endl;
    }
}

void Foam::expInletFvPatchVectorField::write
(
    Ostream& os
) const
{
    fvPatchVectorField::write(os);
    writeEntry(os, "meanVelocity", meanVelocity_);
    writeEntry(os, "n", n_);
    writeEntry(os, "R", R_);
    writeEntry(os, "value", *this);
}


// * * * * * * * * * * * * * * Build Macro Function  * * * * * * * * * * * * //

namespace Foam
{
    makePatchTypeField
    (
        fvPatchVectorField,
        expInletFvPatchVectorField
    );
}

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