/*---------------------------------------------------------------------------*\
  =========                 |
  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
   \\    /   O peration     | Website:  https://openfoam.org
    \\  /    A nd           | Copyright (C) 2012-2020 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 "OBJstream.H"
#include "primitivePatch.H"

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

namespace Foam
{
    defineTypeNameAndDebug(OBJstream, 0);
}


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

void Foam::OBJstream::writeAndCheck(const char c)
{
    if (c == '\n')
    {
        startOfLine_ = true;
    }
    else if (startOfLine_)
    {
        startOfLine_ = false;
        if (c == 'v')
        {
            nVertices_++;
        }
    }
    OFstream::write(c);
}


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

Foam::OBJstream::OBJstream
(
    const fileName& pathname,
    streamFormat format,
    versionNumber version,
    compressionType compression
)
:
    OFstream(pathname, format, version, compression),
    startOfLine_(true),
    nVertices_(0)
{}


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

Foam::OBJstream::~OBJstream()
{}


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

Foam::Ostream& Foam::OBJstream::write(const char c)
{
    writeAndCheck(c);
    return *this;
}


Foam::Ostream& Foam::OBJstream::write(const char* str)
{
    for (const char* p = str; *p != '\0'; ++p)
    {
        writeAndCheck(*p);
    }
    return *this;
}


Foam::Ostream& Foam::OBJstream::write(const word& str)
{
    write(str.c_str());
    return *this;
}


Foam::Ostream& Foam::OBJstream::write(const string& str)
{
    OFstream::write(char(token::BEGIN_STRING));

    int backslash = 0;
    for (string::const_iterator iter = str.begin(); iter != str.end(); ++iter)
    {
        char c = *iter;

        if (c == '\\')
        {
            backslash++;
            // suppress output until we know if other characters follow
            continue;
        }
        else if (c == token::NL)
        {
            lineNumber_++;
            backslash++;    // backslash escape for newline
        }
        else if (c == token::END_STRING)
        {
            backslash++;    // backslash escape for quote
        }

        // output pending backslashes
        while (backslash)
        {
            OFstream::write('\\');
            backslash--;
        }

        writeAndCheck(c);
    }

    // silently drop any trailing backslashes
    // they would otherwise appear like an escaped end-quote

    OFstream::write(char(token::END_STRING));
    return *this;
}


Foam::Ostream& Foam::OBJstream::writeQuoted
(
    const std::string& str,
    const bool quoted
)
{
    if (quoted)
    {
        OFstream::write(char(token::BEGIN_STRING));

        int backslash = 0;
        for
        (
            string::const_iterator iter = str.begin();
            iter != str.end();
            ++iter
        )
        {
            char c = *iter;

            if (c == '\\')
            {
                backslash++;
                // suppress output until we know if other characters follow
                continue;
            }
            else if (c == token::NL)
            {
                lineNumber_++;
                backslash++;    // backslash escape for newline
            }
            else if (c == token::END_STRING)
            {
                backslash++;    // backslash escape for quote
            }

            // output pending backslashes
            while (backslash)
            {
                OFstream::write('\\');
                backslash--;
            }

            writeAndCheck(c);
        }

        // silently drop any trailing backslashes
        // they would otherwise appear like an escaped end-quote
        OFstream::write(char(token::END_STRING));
    }
    else
    {
        // output unquoted string, only advance line number on newline
        write(str.c_str());
    }

    return *this;
}


Foam::Ostream& Foam::OBJstream::write(const point& pt)
{
    write("v ") << pt.x() << ' ' << pt.y() << ' ' << pt.z()
        << nl;
    return *this;
}


Foam::Ostream& Foam::OBJstream::write(const point& pt, const vector& n)
{
    write(pt);
    OFstream::write("vn ") << n.x() << ' ' << n.y()
        << ' ' << n.z() << nl;
    return *this;
}


Foam::Ostream& Foam::OBJstream::write(const edge& e, const UList<point>& points)
{
    write(points[e[0]]);
    write(points[e[1]]);
    write("l ") << nVertices_-1 << ' ' << nVertices_ << nl;
    return *this;
}


Foam::Ostream& Foam::OBJstream::write(const linePointRef& ln)
{
    write(ln.start());
    write(ln.end());
    write("l ") << nVertices_-1 << ' ' << nVertices_ << nl;
    return *this;
}


Foam::Ostream& Foam::OBJstream::write
(
    const linePointRef& ln,
    const vector& n0,
    const vector& n1
)
{
    write(ln.start(), n0);
    write(ln.end(), n1);
    write("l ") << nVertices_-1 << ' ' << nVertices_ << nl;
    return *this;
}


Foam::Ostream& Foam::OBJstream::write
(
    const triPointRef& f,
    const bool lines
)
{
    label start = nVertices_;
    write(f.a());
    write(f.b());
    write(f.c());
    if (lines)
    {
        write('l');
        for (int i = 0; i < 3; i++)
        {
            write(' ') << start+1+i;
        }
        write(' ') << start+1 << '\n';
    }
    else
    {
        write('f');
        for (int i = 0; i < 3; i++)
        {
            write(' ') << start+1+i;
        }
        write('\n');
    }
    return *this;
}


Foam::Ostream& Foam::OBJstream::write
(
    const face& f,
    const UList<point>& points,
    const bool lines
)
{
    label start = nVertices_;
    forAll(f, i)
    {
        write(points[f[i]]);
    }
    if (lines)
    {
        write('l');
        forAll(f, i)
        {
            write(' ') << start+1+i;
        }
        write(' ') << start+1 << '\n';
    }
    else
    {
        write('f');
        forAll(f, i)
        {
            write(' ') << start+1+i;
        }
        write('\n');
    }
    return *this;
}


Foam::Ostream& Foam::OBJstream::write
(
    const faceList& fcs,
    const pointField& points,
    const bool lines
)
{
    SubList<face> allFcs(fcs, fcs.size());

    primitivePatch pp(allFcs, points);

    const pointField& localPoints = pp.localPoints();
    const faceList& localFaces = pp.localFaces();

    label start = nVertices_;

    forAll(localPoints, i)
    {
        write(localPoints[i]);
    }

    if (lines)
    {
        const edgeList& edges = pp.edges();
        forAll(edges, edgeI)
        {
            const edge& e = edges[edgeI];

            write("l ") << start+e[0]+1 << ' ' << start+e[1]+1 << nl;
        }
    }
    else
    {
        forAll(localFaces, facei)
        {
            const face& f = localFaces[facei];
            write('f');
            forAll(f, i)
            {
                write(' ') << start+f[i]+1;
            }
            write('\n');
        }
    }
    return *this;
}


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