// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only

#ifndef QLIBRARY_H
#define QLIBRARY_H

#include <QtCore/qobject.h>
#include <QtCore/qtaggedpointer.h>

QT_REQUIRE_CONFIG(library);

QT_BEGIN_NAMESPACE

class QLibraryPrivate;

class Q_CORE_EXPORT QLibrary : public QObject
{
    Q_OBJECT
    Q_PROPERTY(QString fileName READ fileName WRITE setFileName)
    Q_PROPERTY(LoadHints loadHints READ loadHints WRITE setLoadHints)
public:
    enum LoadHint {
        ResolveAllSymbolsHint = 0x01,
        ExportExternalSymbolsHint = 0x02,
        LoadArchiveMemberHint = 0x04,
        PreventUnloadHint = 0x08,
        DeepBindHint = 0x10
    };
    Q_DECLARE_FLAGS(LoadHints, LoadHint)
    Q_ENUM(LoadHint)
    Q_FLAG(LoadHints)

    explicit QLibrary(QObject *parent = nullptr);
    explicit QLibrary(const QString &fileName, QObject *parent = nullptr);
    explicit QLibrary(const QString &fileName, int verNum, QObject *parent = nullptr);
    explicit QLibrary(const QString &fileName, const QString &version, QObject *parent = nullptr);
    ~QLibrary();

    QFunctionPointer resolve(const char *symbol);
    static QFunctionPointer resolve(const QString &fileName, const char *symbol);
    static QFunctionPointer resolve(const QString &fileName, int verNum, const char *symbol);
    static QFunctionPointer resolve(const QString &fileName, const QString &version, const char *symbol);

    bool load();
    bool unload();
    bool isLoaded() const;

    static bool isLibrary(const QString &fileName);

    void setFileName(const QString &fileName);
    QString fileName() const;

    void setFileNameAndVersion(const QString &fileName, int verNum);
    void setFileNameAndVersion(const QString &fileName, const QString &version);
    QString errorString() const;

    void setLoadHints(LoadHints hints);
    LoadHints loadHints() const;

private:
    enum LoadStatusTag {
        NotLoaded,
        Loaded
    };

    friend class QLibraryPrivate;
    QTaggedPointer<QLibraryPrivate, LoadStatusTag> d = nullptr;
    Q_DISABLE_COPY(QLibrary)
};

Q_DECLARE_OPERATORS_FOR_FLAGS(QLibrary::LoadHints)

QT_END_NAMESPACE

#endif //QLIBRARY_H
