/*---------------------------------------------------------------------------*\
  =========                 |
  \\      /  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 "codeStream.H"
#include "dynamicCode.H"
#include "Time.H"
#include "OSspecific.H"
#include "PstreamReduceOps.H"
#include "addToRunTimeSelectionTable.H"
#include "addToMemberFunctionSelectionTable.H"

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

namespace Foam
{
namespace functionEntries
{
    defineFunctionTypeNameAndDebug(codeStream, 0);

    addToRunTimeSelectionTable(functionEntry, codeStream, dictionary);

    addToMemberFunctionSelectionTable
    (
        functionEntry,
        codeStream,
        execute,
        primitiveEntryIstream
    );
}
}


const Foam::wordList Foam::functionEntries::codeStream::codeKeys
(
    {"code", "codeInclude", "localCode"}
);

const Foam::wordList Foam::functionEntries::codeStream::codeDictVars
(
    {"dict", word::null, word::null}
);

const Foam::word Foam::functionEntries::codeStream::codeOptions
(
    "codeStreamOptions"
);

const Foam::wordList Foam::functionEntries::codeStream::compileFiles
{
    "codeStreamTemplate.C"
};


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

bool Foam::functionEntries::codeStream::masterOnlyRead
(
    const word& typeName,
    const dictionary& dict
)
{
    const dictionary& topDict = dict.topDict();

    if (debug)
    {
        Pout<< typeName << " : dictionary:" << dict.name()
            << " master-only-reading:" << topDict.global()
            << endl;
    }

    return topDict.global();
}


Foam::string Foam::functionEntries::codeStream::codeString
(
    const word& typeName,
    const word& templateFunctionName,
    const label index,
    const dictionary& contextDict,
    Istream& is
)
{
    // Construct code string for codeStream using the context dictionary for
    // string expansion and variable substitution
    const dictionary codeDict(typeName, contextDict, is);

    if (codeDict.found("codeInclude"))
    {
        IOWarningInFunction(is)
            << "codeInclude entry not supported within #codeBlock, "
               "use #codeInclude instead."
            << endl;
    }

    return
    (
        templateFunctionName + '(' + Foam::name(index) + ")\n"
        "{\n"
        "    #line " + Foam::name(codeDict.lookup("code").lineNumber())
      + " \"" + codeDict.name() + "\"\n"
      + codeDict.lookup<verbatimString>("code")
      + "\n}\n\n"
    );
}


Foam::string Foam::functionEntries::codeStream::codeString
(
    const label index,
    const dictionary& contextDict,
    Istream& is
)
{
    return codeString
    (
        typeName,
        "CODE_BLOCK_STREAM_FUNCTION",
        index,
        contextDict,
        is
    );
}


void* Foam::functionEntries::codeStream::compile
(
    const word& typeName,
    const dictionary& contextDict,
    const dictionary& codeDict,
    const word& codeOptions,
    const wordList& compileFiles,
    word& codeName
)
{
    // Get code, codeInclude, ...
    // codeName: codeStream + _<sha1>
    // codeDir : _<sha1>
    dynamicCode dynCode
    (
        contextDict,
        codeDict,
        typeName.remove('#'),
        word::null,
        codeKeys,
        codeDictVars,
        codeOptions,
        compileFiles,
        wordList::null()
    );

    // Load library if not already loaded
    // Version information is encoded in the libPath (encoded with the SHA1)
    const fileName libPath = dynCode.libPath();

    // See if library is loaded
    void* lib = libs.findLibrary(libPath);

    if (debug && !lib)
    {
        Info<< "Using " << typeName << " with " << libPath << endl;
    }

    // Nothing loaded
    // avoid compilation if possible by loading an existing library
    if (!lib)
    {
        lib = dynCode.loadLibrary(libPath);
    }

    // Create library if required and load
    if (!lib)
    {
        dynCode.createLibrary
        (
            contextDict,
            masterOnlyRead(typeName, contextDict)
        );

        lib = dynCode.loadLibrary(libPath);
    }

    if (!lib)
    {
        FatalIOErrorInFunction(contextDict)
            << "Failed loading library " << libPath << nl
            << "Did you add all libraries to the 'libs' entry"
            << " in system/controlDict?"
            << exit(FatalIOError);
    }

    bool allHaveLib = lib;
    if (!masterOnlyRead(typeName, contextDict))
    {
        reduce(allHaveLib, andOp());
    }

    if (!allHaveLib)
    {
        FatalIOErrorInFunction(contextDict)
            << "Failed loading library " << libPath
            << " on some processors."
            << exit(FatalIOError);
    }

    codeName = dynCode.codeSha1Name();

    return lib;
}


Foam::functionEntries::codeStream::streamingFunctionType
Foam::functionEntries::codeStream::getFunction
(
    const dictionary& contextDict,
    const dictionary& codeDict
)
{
    word codeName;
    void* lib = compile
    (
        typeName,
        contextDict,
        codeDict,
        codeOptions,
        compileFiles,
        codeName
    );

    // Find the function handle in the library
    const streamingFunctionType function =
        reinterpret_cast<streamingFunctionType>
        (
            dlSym(lib, codeName)
        );

    if (!function)
    {
        FatalIOErrorInFunction(contextDict)
            << "Failed looking up symbol " << codeName
            << " in library " << lib << exit(FatalIOError);
    }

    return function;
}


Foam::OTstream Foam::functionEntries::codeStream::resultStream
(
    const dictionary& contextDict,
    Istream& is
)
{
    if (debug)
    {
        Info<< "Using " << typeName << " at line " << is.lineNumber()
            << " in file " <<  contextDict.name() << endl;
    }

    // Construct codeDict for codeStream using the context dictionary
    // for string expansion and variable substitution
    const dictionary codeDict(typeName, contextDict, is);

    // Compile and link the code library and get the function pointer
    const streamingFunctionType function = getFunction(contextDict, codeDict);

    // Use function to write stream
    OTstream ots(is.name(), is.format());
    ots.lineNumber() = is.lineNumber();
    (*function)(ots, contextDict);

    // Return the OTstream containing the results of the code execution
    return ots;
}


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

Foam::functionEntries::codeStream::codeStream
(
    const functionName& functionType,
    const label lineNumber,
    const dictionary& dict
)
:
    functionEntry(functionType, lineNumber, dict)
{}


Foam::functionEntries::codeStream::codeStream
(
    const label lineNumber,
    const dictionary& parentDict,
    Istream& is
)
:
    functionEntry(typeName, lineNumber, parentDict)
{}


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

bool Foam::functionEntries::codeStream::execute
(
    dictionary& contextDict,
    Istream& is
)
{
    return insert(contextDict, resultStream(contextDict, is));
}


bool Foam::functionEntries::codeStream::execute
(
    const dictionary& contextDict,
    primitiveEntry& contextEntry,
    Istream& is
)
{
    return insert(contextDict, contextEntry, resultStream(contextDict, is));
}


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