/****************************************************************************
**
** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the qmake application of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** GNU Lesser General Public License Usage
** This file may be used under the terms of the GNU Lesser General Public
** License version 2.1 as published by the Free Software Foundation and
** appearing in the file LICENSE.LGPL included in the packaging of this
** file. Please review the following information to ensure the GNU Lesser
** General Public License version 2.1 requirements will be met:
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU General
** Public License version 3.0 as published by the Free Software Foundation
** and appearing in the file LICENSE.GPL included in the packaging of this
** file. Please review the following information to ensure the GNU General
** Public License version 3.0 requirements will be met:
** http://www.gnu.org/copyleft/gpl.html.
**
** Other Usage
** Alternatively, this file may be used in accordance with the terms and
** conditions contained in a signed written agreement between you and Nokia.
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/

#ifndef MAKEFILE_H
#define MAKEFILE_H

#include "option.h"
#include "project.h"
#include "makefiledeps.h"
#include <qtextstream.h>
#include <qlist.h>
#include <qhash.h>
#include <qfileinfo.h>

QT_BEGIN_NAMESPACE

#ifdef Q_OS_WIN32
#define QT_POPEN _popen
#define QT_PCLOSE _pclose
#else
#define QT_POPEN popen
#define QT_PCLOSE pclose
#endif

struct ReplaceExtraCompilerCacheKey
{
    mutable uint hash;
    QString var, in, out, pwd;
    ReplaceExtraCompilerCacheKey(const QString &v, const QStringList &i, const QStringList &o);
    bool operator==(const ReplaceExtraCompilerCacheKey &f) const;
    inline uint hashCode() const {
        if(!hash)
            hash = qHash(var) | qHash(in) | qHash(out) /*| qHash(pwd)*/;
        return hash;
    }
};
inline uint qHash(const ReplaceExtraCompilerCacheKey &f) { return f.hashCode(); }

struct ReplaceExtraCompilerCacheKey;

class MakefileGenerator : protected QMakeSourceFileInfo
{
    QString spec;
    bool init_opath_already, init_already, no_io;
    QHash<QString, bool> init_compiler_already;
    QString build_args(const QString &outdir=QString());
    void checkMultipleDefinition(const QString &, const QString &);

    //internal caches
    mutable QHash<QString, QMakeLocalFileName> depHeuristicsCache;
    mutable QHash<QString, QStringList> dependsCache;
    mutable QHash<ReplaceExtraCompilerCacheKey, QString> extraCompilerVariablesCache;

protected:
    QStringList createObjectList(const QStringList &sources);

    //makefile style generator functions
    void writeObj(QTextStream &, const QString &src);
    void writeInstalls(QTextStream &t, const QString &installs, bool noBuild=false);
    void writeHeader(QTextStream &t);
    void writeSubDirs(QTextStream &t);
    void writeMakeQmake(QTextStream &t);
    void writeExtraVariables(QTextStream &t);
    void writeExtraTargets(QTextStream &t);
    void writeExtraCompilerTargets(QTextStream &t);
    void writeExtraCompilerVariables(QTextStream &t);
    virtual bool writeStubMakefile(QTextStream &t);
    virtual bool writeMakefile(QTextStream &t);

    QString pkgConfigPrefix() const;
    QString pkgConfigFileName(bool fixify=true);
    QString pkgConfigFixPath(QString) const;
    void writePkgConfigFile();   // for pkg-config

    //generating subtarget makefiles
    struct SubTarget
    {
        QString name;
        QString in_directory, out_directory;
        QString profile, target, makefile;
        QStringList depends;
    };
    enum SubTargetFlags {
        SubTargetInstalls=0x01,
        SubTargetOrdered=0x02,
        SubTargetSkipDefaultVariables=0x04,
        SubTargetSkipDefaultTargets=0x08,

        SubTargetsNoFlags=0x00
    };
    QList<MakefileGenerator::SubTarget*> findSubDirsSubTargets() const;
    virtual void writeSubMakeCall(QTextStream &t, const QString &outDirectory_cdin,
                                  const QString &makeFileIn, const QString &outDirectory_cdout);
    void writeSubTargets(QTextStream &t, QList<SubTarget*> subtargets, int flags);

    //extra compiler interface
    bool verifyExtraCompiler(const QString &c, const QString &f);
    virtual QString replaceExtraCompilerVariables(const QString &, const QStringList &, const QStringList &);
    inline QString replaceExtraCompilerVariables(const QString &val, const QString &in, const QString &out)
    { return replaceExtraCompilerVariables(val, QStringList(in), QStringList(out)); }

    //interface to the source file info
    QMakeLocalFileName fixPathForFile(const QMakeLocalFileName &, bool);
    QMakeLocalFileName findFileForDep(const QMakeLocalFileName &, const QMakeLocalFileName &);
    QFileInfo findFileInfo(const QMakeLocalFileName &);
    QMakeProject *project;

    //escape
    virtual QString unescapeFilePath(const QString &path) const;
    virtual QStringList unescapeFilePaths(const QStringList &path) const;
    virtual QString escapeFilePath(const QString &path) const { return path; }
    virtual QString escapeDependencyPath(const QString &path) const { return escapeFilePath(path); }
    QStringList escapeFilePaths(const QStringList &paths) const;
    QStringList escapeDependencyPaths(const QStringList &paths) const;

    //initialization
    void verifyCompilers();
    virtual void init();
    void initOutPaths();
    struct Compiler
    {
        QString variable_in;
        enum CompilerFlag {
            CompilerNoFlags       = 0x00,
            CompilerBuiltin       = 0x01,
            CompilerNoCheckDeps   = 0x02,
            CompilerRemoveNoExist = 0x04
        };
        uint flags, type;
    };
    void initCompiler(const Compiler &comp);
    enum VPATHFlag {
        VPATH_NoFlag             = 0x00,
        VPATH_WarnMissingFiles   = 0x01,
        VPATH_RemoveMissingFiles = 0x02,
        VPATH_NoFixify           = 0x04
    };
    QStringList findFilesInVPATH(QStringList l, uchar flags, const QString &var="");

    inline int findExecutable(const QStringList &cmdline)
    { int ret; canExecute(cmdline, &ret); return ret; }
    bool canExecute(const QStringList &cmdline, int *argv0) const;
    inline bool canExecute(const QString &cmdline) const
    { return canExecute(cmdline.split(' '), 0); }

    bool mkdir(const QString &dir) const;
    QString mkdir_p_asstring(const QString &dir, bool escape=true) const;

    //subclasses can use these to query information about how the generator was "run"
    QString buildArgs(const QString &outdir=QString());
    QString specdir(const QString &outdir=QString());

    virtual QStringList &findDependencies(const QString &file);
    virtual bool doDepends() const { return Option::mkfile::do_deps; }

    void filterIncludedFiles(const QString &);
    virtual void processSources() {
        filterIncludedFiles("SOURCES");
        filterIncludedFiles("GENERATED_SOURCES");
    }

    //for cross-platform dependent directories
    virtual void usePlatformDir();

    //for installs
    virtual QString defaultInstall(const QString &);

    //for prl
    QString prlFileName(bool fixify=true);
    void writePrlFile();
    bool processPrlFile(QString &);
    virtual void processPrlVariable(const QString &, const QStringList &);
    virtual void processPrlFiles();
    virtual void writePrlFile(QTextStream &);

    //make sure libraries are found
    virtual bool findLibraries();

    //for retrieving values and lists of values
    virtual QString var(const QString &var);
    QString varGlue(const QString &var, const QString &before, const QString &glue, const QString &after);
    QString varList(const QString &var);
    QString val(const QStringList &varList);
    QString valGlue(const QStringList &varList, const QString &before, const QString &glue, const QString &after);
    QString valList(const QStringList &varList);

    QString filePrefixRoot(const QString &, const QString &);

    //file fixification to unify all file names into a single pattern
    enum FileFixifyType { FileFixifyAbsolute, FileFixifyRelative, FileFixifyDefault };
    QString fileFixify(const QString& file, const QString &out_dir=QString(),
                       const QString &in_dir=QString(), FileFixifyType fix=FileFixifyDefault, bool canon=true) const;
    inline QString fileFixify(const QString& file, FileFixifyType fix, bool canon=true) const
    { return fileFixify(file, QString(), QString(), fix, canon); }
    QStringList fileFixify(const QStringList& files, const QString &out_dir=QString(),
                           const QString &in_dir=QString(), FileFixifyType fix=FileFixifyDefault, bool canon=true) const;
    inline QStringList fileFixify(const QStringList& files, FileFixifyType fix, bool canon=true) const
    { return fileFixify(files, QString(), QString(), fix, canon); }

public:
    MakefileGenerator();
    virtual ~MakefileGenerator();
    QMakeProject *projectFile() const;
    void setProjectFile(QMakeProject *p);

    void setNoIO(bool o);
    bool noIO() const;

    inline bool exists(QString file) const { return fileInfo(file).exists(); }
    QFileInfo fileInfo(QString file) const;

    static MakefileGenerator *create(QMakeProject *);
    virtual bool write();
    virtual bool writeProjectMakefile();
    virtual bool supportsMetaBuild() { return true; }
    virtual bool supportsMergedBuilds() { return false; }
    virtual bool mergeBuildProject(MakefileGenerator * /*other*/) { return false; }
    virtual bool openOutput(QFile &, const QString &build) const;
    virtual bool isWindowsShell() const { return Option::host_mode == Option::HOST_WIN_MODE; }
    virtual bool isForSymbianSbsv2() const { return false; } // FIXME: killme - i'm ugly!

    /* The next one is to avoid having SymbianCommonGenerator as a virtually
       inherited class of this class. Instead it is without a base class
       (avoiding the virtual inheritance problem), and is allowed to use
       functions defined in here.

       To illustrate:
                               +-------------------+
                               | MakefileGenerator |
                               +-------------------+
                                 ^            ^
                                 |            |
                                 |            X <-- Avoid this inheritance
                                 |            |
              +------------------------+  +------------------------+
              | UnixMakefileGenerator  |  | SymbianCommonGenerator |
              |         or             |  |                        |
              | NmakeMakefileGenerator |  |                        |
              +------------------------+  +------------------------+
                                 ^            ^
                                 |            |
                                 |            |
                                 |            |
                           +-----------------------------+
                           | SymbianMakefileTemplate<>   |
                           +-----------------------------+

       We want to avoid the famous diamond problem, because if we have that, we need
       virtual inheritance, which not all compilers like. Therefore, we break the
       link as illustrated. Instead, we have a pointer to MakefileGenerator inside
       SymbianCommonGenerator, and allows full access by making it a friend here.
    */
    friend class SymbianCommonGenerator;
};

inline void MakefileGenerator::setNoIO(bool o)
{ no_io = o; }

inline bool MakefileGenerator::noIO() const
{ return no_io; }

inline QString MakefileGenerator::defaultInstall(const QString &)
{ return QString(""); }

inline bool MakefileGenerator::findLibraries()
{ return true; }

inline MakefileGenerator::~MakefileGenerator()
{ }

QT_END_NAMESPACE

#endif // MAKEFILE_H