/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of Qt Creator.
**
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3 as published by the Free Software
** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-3.0.html.
**
****************************************************************************/

#pragma once

#include "core_global.h"

#include <QString>
#include <QObject>

namespace Core {

class Id;
class IVersionControl;

namespace Internal { class MainWindow; }

/* VcsManager:
 * 1) Provides functionality for finding the IVersionControl * for a given
 *    filename (findVersionControlForDirectory). Note that the VcsManager assumes
 *    that if a IVersionControl * manages a directory, then it also manages
 *    all the files and all the subdirectories.
 *    It works by asking all IVersionControl * if they manage the file, and ask
 *    for the topmost directory it manages. This information is cached and
 *    VCSManager thus knows pretty fast which IVersionControl * is responsible.
 * 2) Passes on the changes from the version controls caused by updating or
 *    branching repositories and routes them to its signals (repositoryChanged,
 *    filesChanged). */

class CORE_EXPORT VcsManager : public QObject
{
    Q_OBJECT

public:
    static VcsManager *instance();

    template <typename T, typename... Args>
    static T *registerVersionControl(Args&&... args)
    {
        auto vc = new T(std::forward<Args>(args)...);
        addVersionControl(vc);
        return vc;
    }

    static void extensionsInitialized();

    static const QList<IVersionControl *> versionControls();
    static IVersionControl *versionControl(Id id);

    static void resetVersionControlForDirectory(const QString &inputDirectory);
    static IVersionControl *findVersionControlForDirectory(const QString &directory,
                                                           QString *topLevelDirectory = nullptr);
    static QString findTopLevelForDirectory(const QString &directory);

    static QStringList repositories(const IVersionControl *);

    // Shows a confirmation dialog, whether the file should also be deleted
    // from revision control. Calls vcsDelete on the file. Returns false
    // if a failure occurs
    static bool promptToDelete(const QString &fileName);
    static bool promptToDelete(IVersionControl *versionControl, const QString &fileName);

    // Shows a confirmation dialog, whether the files in the list should be
    // added to revision control. Calls vcsAdd for each file.
    static void promptToAdd(const QString &directory, const QStringList &fileNames);

    static void emitRepositoryChanged(const QString &repository);

    // Utility messages for adding files
    static QString msgAddToVcsTitle();
    static QString msgPromptToAddToVcs(const QStringList &files, const IVersionControl *vc);
    static QString msgAddToVcsFailedTitle();
    static QString msgToAddToVcsFailed(const QStringList &files, const IVersionControl *vc);

    /*!
     * Return a list of paths where tools that came with the VCS may be installed.
     * This is helpful on windows where e.g. git comes with a lot of nice unix tools.
     */
    static QStringList additionalToolsPath();

    static void clearVersionControlCache();

signals:
    void repositoryChanged(const QString &repository);
    void configurationChanged(const IVersionControl *vcs);

private:
    explicit VcsManager(QObject *parent = nullptr);
    ~VcsManager() override;

    static void addVersionControl(IVersionControl *vc);

    void handleConfigurationChanges();

    friend class Core::Internal::MainWindow;
};

} // namespace Core