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/****************************************************************************
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**
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** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
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** Contact: http://www.qt-project.org/legal
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**
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** This file is part of Qt Creator.
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**
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** 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 Digia.  For licensing terms and
** conditions see http://qt.digia.com/licensing.  For further information
** use the contact form at http://qt.digia.com/contact-us.
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**
** GNU Lesser General Public License Usage
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** Alternatively, 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, Digia gives you certain additional
** rights.  These rights are described in the Digia Qt LGPL Exception
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
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****************************************************************************/
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#include "settingsaccessor.h"
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#include "abi.h"
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#include "devicesupport/devicemanager.h"
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#include "project.h"
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#include "projectexplorer.h"
#include "projectexplorersettings.h"
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#include "toolchain.h"
#include "toolchainmanager.h"
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#include "kit.h"
#include "kitmanager.h"
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#include <coreplugin/icore.h>
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#include <utils/persistentsettings.h>
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#include <utils/hostosinfo.h>
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#include <utils/qtcassert.h>
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#include <utils/qtcprocess.h>
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#include <QApplication>
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using namespace Utils;

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namespace {
static QString generateSuffix(const QString &alt1, const QString &alt2)
{
    QString suffix = alt1;
    if (suffix.isEmpty())
        suffix = alt2;
    suffix.replace(QRegExp(QLatin1String("[^a-zA-Z0-9_.-]")), QString(QLatin1Char('_'))); // replace fishy characters:
    if (!suffix.startsWith(QLatin1String(".")))
        suffix.prepend(QLatin1Char('.'));
    return suffix;
}
} // end namespace

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namespace ProjectExplorer {
namespace Internal {

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// --------------------------------------------------------------------
// VersionUpgrader:
// --------------------------------------------------------------------
// Handles updating a QVariantMap from version() - 1 to version()
class VersionUpgrader
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{
public:
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    VersionUpgrader() { }
    virtual ~VersionUpgrader() { }
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    virtual int version() const = 0;
    virtual QString backupExtension() const = 0;
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    virtual QVariantMap upgrade(const QVariantMap &data) = 0;
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protected:
    typedef QPair<QLatin1String,QLatin1String> Change;
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    QVariantMap renameKeys(const QList<Change> &changes, QVariantMap map) const;
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};

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/*!
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 * Performs a simple renaming of the listed keys in \a changes recursively on \a map.
 */
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QVariantMap VersionUpgrader::renameKeys(const QList<Change> &changes, QVariantMap map) const
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{
    foreach (const Change &change, changes) {
        QVariantMap::iterator oldSetting = map.find(change.first);
        if (oldSetting != map.end()) {
            map.insert(change.second, oldSetting.value());
            map.erase(oldSetting);
        }
    }

    QVariantMap::iterator i = map.begin();
    while (i != map.end()) {
        QVariant v = i.value();
        if (v.type() == QVariant::Map)
            i.value() = renameKeys(changes, v.toMap());

        ++i;
    }

    return map;
}

} // Internal
} // ProjectExplorer

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using namespace ProjectExplorer;
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using namespace Internal;
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namespace {
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const char USER_STICKY_KEYS_KEY[] = "UserStickyKeys";
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const char SHARED_SETTINGS[] = "SharedSettings";
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const char ENVIRONMENT_ID_KEY[] = "EnvironmentId";
const char VERSION_KEY[] = "Version";
const char ORIGINAL_VERSION_KEY[] = "OriginalVersion";

// for compatibility with QtC 3.1 and older:
const char OBSOLETE_VERSION_KEY[] = "ProjectExplorer.Project.Updater.FileVersion";
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// Version 1 is used in master post Qt Creator 1.3.x.
// It was never used in any official release but is required for the
// transition to later versions (which introduce support for targets).
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class UserFileVersion1Upgrader : public VersionUpgrader
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{
public:
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    UserFileVersion1Upgrader(UserFileAccessor *a) : m_accessor(a) { }
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    int version() const { return 1; }
    QString backupExtension() const { return QLatin1String("1.3+git"); }
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    QVariantMap upgrade(const QVariantMap &map);
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private:
    struct TargetDescription
    {
        TargetDescription(QString tid, QString dn) :
            id(tid),
            displayName(dn)
        {
        }

        TargetDescription(const TargetDescription &td) :
            id(td.id),
            displayName(td.displayName)
        {
        }

        QString id;
        QString displayName;
    };
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    UserFileAccessor *m_accessor;
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};

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// Version 2 is used in master post Qt Creator 2.0 alpha.
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class UserFileVersion2Upgrader : public VersionUpgrader
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{
public:
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    int version() const { return 2; }
    QString backupExtension() const { return QLatin1String("2.0-alpha+git"); }
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    QVariantMap upgrade(const QVariantMap &map);
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};

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// Version 3 reflect the move of symbian signing from run to build step.
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class UserFileVersion3Upgrader : public VersionUpgrader
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{
public:
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    int version() const { return 3; }
    QString backupExtension() const { return QLatin1String("2.0-alpha2+git"); }
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    QVariantMap upgrade(const QVariantMap &map);
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};

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// Version 4 reflects the introduction of deploy steps
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class UserFileVersion4Upgrader : public VersionUpgrader
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{
public:
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    int version() const { return 4; }
    QString backupExtension() const { return QLatin1String("2.1pre1"); }
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    QVariantMap upgrade(const QVariantMap &map);
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};

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// Version 5 reflects the introduction of new deploy steps for Symbian/Maemo
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class UserFileVersion5Upgrader : public VersionUpgrader
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{
public:
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    int version() const { return 5; }
    QString backupExtension() const { return QLatin1String("2.1pre2"); }
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    QVariantMap upgrade(const QVariantMap &map);
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};

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// Version 6 reflects the introduction of new deploy steps for Symbian/Maemo
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class UserFileVersion6Upgrader : public VersionUpgrader
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{
public:
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    int version() const { return 6; }
    QString backupExtension() const { return QLatin1String("2.1pre3"); }
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    QVariantMap upgrade(const QVariantMap &map);
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};

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// Version 7 reflects the introduction of new deploy configuration for Symbian
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class UserFileVersion7Upgrader : public VersionUpgrader
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{
public:
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    int version() const { return 7; }
    QString backupExtension() const { return QLatin1String("2.1pre4"); }
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    QVariantMap upgrade(const QVariantMap &map);
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};

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// Version 8 reflects the change of environment variable expansion rules,
// turning some env variables into expandos, the change of argument quoting rules,
// and the change of VariableManager's expansion syntax.
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class UserFileVersion8Upgrader : public VersionUpgrader
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{
public:
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    int version() const { return 8; }
    QString backupExtension() const {
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        // pre5 because we renamed 2.2 to 2.1 later, so people already have 2.2pre4 files
        return QLatin1String("2.2pre5");
    }
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    QVariantMap upgrade(const QVariantMap &map);
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};

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// Version 9 reflects the refactoring of the Maemo deploy step.
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class UserFileVersion9Upgrader : public VersionUpgrader
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{
public:
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    int version() const { return 9; }
    QString backupExtension() const { return QLatin1String("2.3pre1"); }
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    QVariantMap upgrade(const QVariantMap &map);
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};

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// Version 10 introduces disabling buildsteps, and handles upgrading custom process steps
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class UserFileVersion10Upgrader : public VersionUpgrader
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{
public:
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    int version() const { return 10; }
    QString backupExtension() const { return QLatin1String("2.5pre1"); }
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    QVariantMap upgrade(const QVariantMap &map);
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};
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// Version 11 introduces kits
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class UserFileVersion11Upgrader : public VersionUpgrader
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{
public:
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    UserFileVersion11Upgrader(UserFileAccessor *a) : m_accessor(a) { }
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    ~UserFileVersion11Upgrader();
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    int version() const { return 11; }
    QString backupExtension() const { return QLatin1String("2.6pre1"); }
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    QVariantMap upgrade(const QVariantMap &map);
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private:
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    Kit *uniqueKit(Kit *k);
    void addBuildConfiguration(Kit *k, const QVariantMap &bc, int bcPos, int bcCount);
    void addDeployConfiguration(Kit *k, const QVariantMap &dc, int dcPos, int dcActive);
    void addRunConfigurations(Kit *k,
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                              const QMap<int, QVariantMap> &rcs, int activeRc, const QString &projectDir);
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    void parseQtversionFile();
    void parseToolChainFile();

    class ToolChainExtraData {
    public:
        explicit ToolChainExtraData(const QString &mks = QString(), const QString &d = QString()) :
            m_mkspec(mks), m_debugger(d)
        { }

        QString m_mkspec;
        QString m_debugger;
    };

    QHash<QString, ToolChainExtraData> m_toolChainExtras;
    QHash<int, QString> m_qtVersionExtras;

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    QHash<Kit *, QVariantMap> m_targets;
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    UserFileAccessor *m_accessor;
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};

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// Version 12 reflects the move of environment settings from CMake/Qt4/Custom into
// LocalApplicationRunConfiguration
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class UserFileVersion12Upgrader : public VersionUpgrader
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{
public:
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    int version() const { return 12; }
    QString backupExtension() const { return QLatin1String("2.7pre1"); }
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    QVariantMap upgrade(const QVariantMap &map);
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};

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// Version 13 reflects the move of environment settings from LocalApplicationRunConfiguration
// into the EnvironmentAspect
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class UserFileVersion13Upgrader : public VersionUpgrader
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{
public:
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    int version() const { return 13; }
    QString backupExtension() const { return QLatin1String("2.8"); }
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    QVariantMap upgrade(const QVariantMap &map);
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};

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// Version 14 Move builddir into BuildConfiguration
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class UserFileVersion14Upgrader : public VersionUpgrader
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{
public:
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    int version() const { return 14; }
    QString backupExtension() const { return QLatin1String("3.0-pre1"); }
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    QVariantMap upgrade(const QVariantMap &map);
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};

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// Version 15 Use settingsaccessor based class for user file reading/writing
class UserFileVersion15Upgrader : public VersionUpgrader
{
public:
    int version() const { return 15; }
    QString backupExtension() const { return QLatin1String("3.2-pre1"); }
    QVariantMap upgrade(const QVariantMap &map);
};
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} // namespace

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//
// Helper functions:
//

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QT_BEGIN_NAMESPACE

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class HandlerNode
{
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public:
    QSet<QString> strings;
    QHash<QString, HandlerNode> children;
};
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Q_DECLARE_TYPEINFO(HandlerNode, Q_MOVABLE_TYPE);

QT_END_NAMESPACE

static HandlerNode buildHandlerNodes(const char * const **keys)
{
    HandlerNode ret;
    while (const char *rname = *(*keys)++) {
        QString name = QLatin1String(rname);
        if (name.endsWith(QLatin1Char('.'))) {
            HandlerNode sub = buildHandlerNodes(keys);
            foreach (const QString &key, name.split(QLatin1Char('|')))
                ret.children.insert(key, sub);
        } else {
            ret.strings.insert(name);
        }
    }
    return ret;
}

static QVariantMap processHandlerNodes(const HandlerNode &node, const QVariantMap &map,
                                       QVariant (*handler)(const QVariant &var))
{
    QVariantMap result;
    QMapIterator<QString, QVariant> it(map);
    while (it.hasNext()) {
        it.next();
        const QString &key = it.key();
        if (node.strings.contains(key)) {
            result.insert(key, handler(it.value()));
            goto handled;
        }
        if (it.value().type() == QVariant::Map)
            for (QHash<QString, HandlerNode>::ConstIterator subit = node.children.constBegin();
                 subit != node.children.constEnd(); ++subit)
                if (key.startsWith(subit.key())) {
                    result.insert(key, processHandlerNodes(subit.value(), it.value().toMap(), handler));
                    goto handled;
                }
        result.insert(key, it.value());
      handled: ;
    }
    return result;
}
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// --------------------------------------------------------------------
// UserFileAccessor:
// --------------------------------------------------------------------
UserFileAccessor::UserFileAccessor(Project *project)
    : SettingsAccessor(project)
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{
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    // Register Upgraders:
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    addVersionUpgrader(new UserFileVersion1Upgrader(this));
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    addVersionUpgrader(new UserFileVersion2Upgrader);
    addVersionUpgrader(new UserFileVersion3Upgrader);
    addVersionUpgrader(new UserFileVersion4Upgrader);
    addVersionUpgrader(new UserFileVersion5Upgrader);
    addVersionUpgrader(new UserFileVersion6Upgrader);
    addVersionUpgrader(new UserFileVersion7Upgrader);
    addVersionUpgrader(new UserFileVersion8Upgrader);
    addVersionUpgrader(new UserFileVersion9Upgrader);
    addVersionUpgrader(new UserFileVersion10Upgrader);
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    addVersionUpgrader(new UserFileVersion11Upgrader(this));
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    addVersionUpgrader(new UserFileVersion12Upgrader);
    addVersionUpgrader(new UserFileVersion13Upgrader);
    addVersionUpgrader(new UserFileVersion14Upgrader);
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    addVersionUpgrader(new UserFileVersion15Upgrader);
}

QVariantMap UserFileAccessor::prepareSettings(const QVariantMap &data) const
{
    // Move from old Version field to new one:
    // This can not be done in a normal upgrader since the version information is needed
    // to decide which upgraders to run
    QVariantMap result = SettingsAccessor::prepareSettings(data);
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    const QString obsoleteKey = QLatin1String(OBSOLETE_VERSION_KEY);
    if (data.contains(obsoleteKey)) {
        result = setVersionInMap(result, data.value(obsoleteKey, versionFromMap(data)).toInt());
        result.remove(obsoleteKey);
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    }
    return result;
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}

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namespace ProjectExplorer {
// --------------------------------------------------------------------
// SettingsAccessorPrivate:
// --------------------------------------------------------------------
class SettingsAccessorPrivate
{
public:
    SettingsAccessorPrivate() :
        m_writer(0)
    { }

    ~SettingsAccessorPrivate()
    {
        qDeleteAll(m_upgraders);
        delete m_writer;
    }

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    // The relevant data from the settings currently in use.
    class Settings
    {
    public:
        bool isValid() const;

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        QVariantMap map;
        Utils::FileName path;
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    };

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    int firstVersion() const { return m_upgraders.isEmpty() ? -1 : m_upgraders.first()->version(); }
    int lastVersion() const { return m_upgraders.isEmpty() ? -1 : m_upgraders.last()->version(); }
    int currentVersion() const { return lastVersion() + 1; }
    VersionUpgrader *upgrader(const int version) const
    {
        int pos = version - firstVersion();
        if (pos >= 0 && pos < m_upgraders.count())
            return m_upgraders.at(pos);
        return 0;
    }
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    Settings bestSettings(const SettingsAccessor *accessor, const QList<Utils::FileName> &pathList);
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    QList<VersionUpgrader *> m_upgraders;
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    Utils::PersistentSettingsWriter *m_writer;
};
} // end namespace

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SettingsAccessor::SettingsAccessor(Project *project) :
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    m_project(project),
    d(new SettingsAccessorPrivate)
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{
    QTC_CHECK(m_project);
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    m_userSuffix = generateSuffix(QString::fromLocal8Bit(qgetenv("QTC_EXTENSION")), QLatin1String(".user"));
    m_sharedSuffix = generateSuffix(QString::fromLocal8Bit(qgetenv("QTC_SHARED_EXTENSION")), QLatin1String(".shared"));
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}

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SettingsAccessor::~SettingsAccessor()
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{
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    delete d;
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}

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Project *SettingsAccessor::project() const
{ return m_project; }
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namespace {

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class Operation {
public:
    virtual ~Operation() { }

    virtual void apply(QVariantMap &userMap, const QString &key, const QVariant &sharedValue) = 0;

    void synchronize(QVariantMap &userMap, const QVariantMap &sharedMap)
    {
        QVariantMap::const_iterator it = sharedMap.begin();
        QVariantMap::const_iterator eit = sharedMap.end();

        for (; it != eit; ++it) {
            const QString &key = it.key();
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            if (key == QLatin1String(VERSION_KEY) || key == QLatin1String(ENVIRONMENT_ID_KEY))
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                continue;
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            const QVariant &sharedValue = it.value();
            const QVariant &userValue = userMap.value(key);
            if (sharedValue.type() == QVariant::Map) {
                if (userValue.type() != QVariant::Map) {
                    // This should happen only if the user manually changed the file in such a way.
                    continue;
                }
                QVariantMap nestedUserMap = userValue.toMap();
                synchronize(nestedUserMap, sharedValue.toMap());
                userMap.insert(key, nestedUserMap);
                continue;
            }
            if (userMap.contains(key) && userValue != sharedValue) {
                apply(userMap, key, sharedValue);
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                continue;
            }
        }
    }
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};
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class MergeSettingsOperation : public Operation
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{
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public:
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    MergeSettingsOperation(const QSet<QString> &sticky) : m_userSticky(sticky) { }
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    void apply(QVariantMap &userMap, const QString &key, const QVariant &sharedValue)
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    {
        if (!m_userSticky.contains(key))
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            userMap.insert(key, sharedValue);
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    }
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private:
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    QSet<QString> m_userSticky;
};

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class TrackStickyness : public Operation
{
public:
    void apply(QVariantMap &userMap, const QString &key, const QVariant &)
    {
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        Q_UNUSED(userMap);
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        m_userSticky.insert(key);
    }

    QStringList stickySettings() const { return m_userSticky.toList(); }

private:
    QSet<QString> m_userSticky;
};

} // namespace

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int SettingsAccessor::versionFromMap(const QVariantMap &data)
{
    return data.value(QLatin1String(VERSION_KEY), -1).toInt();
}

int SettingsAccessor::originalVersionFromMap(const QVariantMap &data)
{
    return data.value(QLatin1String(ORIGINAL_VERSION_KEY), versionFromMap(data)).toInt();
}

QVariantMap SettingsAccessor::setOriginalVersionInMap(const QVariantMap &data, int version)
{
    QVariantMap result = data;
    result.insert(QLatin1String(ORIGINAL_VERSION_KEY), version);
    return result;
}

QVariantMap SettingsAccessor::setVersionInMap(const QVariantMap &data, int version)
{
    QVariantMap result = data;
    result.insert(QLatin1String(VERSION_KEY), version);
    return result;
}

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/*!
 * Run directly after reading the \a data.
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 *
 * This method is called right after reading the data before any attempt at interpreting the data
 * is made.
 *
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 * Returns the prepared data.
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 */
QVariantMap SettingsAccessor::prepareSettings(const QVariantMap &data) const
{
    return data;
}

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/*!
 * Check which of two sets of data are a better match to load.
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 *
 * This method is used to compare data extracted from two XML settings files.
 * It will never be called with a version too old or too new to be read by
 * the current instance of Qt Creator.
 *
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 * Compares \a newData against \a origData.
 *
 * Returns \c true if \a newData is a better match than \a origData and \c false otherwise.
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 */
bool SettingsAccessor::isBetterMatch(const QVariantMap &origData, const QVariantMap &newData) const
{
    if (origData.isEmpty())
        return true;

    int origVersion = versionFromMap(origData);
    QByteArray origEnv = environmentIdFromMap(origData);

    int newVersion = versionFromMap(newData);
    QByteArray newEnv = environmentIdFromMap(newData);

    if (origEnv != newEnv) {
        if (origEnv == creatorId())
            return false;
        if (newEnv == creatorId())
            return true;
    }

    return newVersion > origVersion;
}

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/*!
 * Upgrade the settings in \a data to the version \a toVersion.
 *
 * Returns settings of the requested version.
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 */
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QVariantMap SettingsAccessor::upgradeSettings(const QVariantMap &data, int toVersion) const
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{
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    const int version = versionFromMap(data);

    if (data.isEmpty())
        return data;
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    QVariantMap result;
    if (!data.contains(QLatin1String(ORIGINAL_VERSION_KEY)))
        result = setOriginalVersionInMap(data, version);
    else
        result = data;
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    if (version < 15 && toVersion < 15) {
        result.insert(QLatin1String(USER_STICKY_KEYS_KEY),
                      data.value(QLatin1String("ProjectExplorer.Project.UserStickyKeys")));
    }

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    if (version >= toVersion
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            || version < d->firstVersion()
            || toVersion > d->currentVersion())
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        return result;
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    for (int i = version; i < toVersion; ++i) {
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        VersionUpgrader *upgrader = d->upgrader(i);
        QTC_CHECK(upgrader && upgrader->version() == i);
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        result = upgrader->upgrade(result);
        result = setVersionInMap(result, i + 1);
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    }

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    return result;
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}

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/*!
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 * Find issues with the settings file and warn the user about them.
 *
 * \a data is the data from the settings file.
 * \a path is the full path to the settings used.
 * \a parent is the widget to be set as parent of any dialogs that are opened.
 *
 * Returns \c true if the settings are not usable anymore and \c false otherwise.
 */
SettingsAccessor::ProceedInfo SettingsAccessor::reportIssues(const QVariantMap &data,
                                                             const Utils::FileName &path,
                                                             QWidget *parent) const
{
    IssueInfo issue = findIssues(data, path);
    QMessageBox::Icon icon = QMessageBox::Information;

    if (issue.buttons.count() > 1)
        icon = QMessageBox::Question;

    QMessageBox::StandardButtons buttons = QMessageBox::NoButton;
    foreach (QMessageBox::StandardButton b, issue.buttons.keys())
        buttons |= b;

    if (buttons == QMessageBox::NoButton)
        return Continue;

    QMessageBox msgBox(icon, issue.title, issue.message, buttons, parent);
    if (issue.defaultButton != QMessageBox::NoButton)
        msgBox.setDefaultButton(issue.defaultButton);
    if (issue.escapeButton != QMessageBox::NoButton)
        msgBox.setEscapeButton(issue.escapeButton);

    int boxAction = msgBox.exec();
    return issue.buttons.value(static_cast<QMessageBox::StandardButton>(boxAction));
}

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/*!
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 * Checks \a data located at \a path for issues to be displayed with reportIssues.
 *
 * Returns a IssueInfo object which is then used by reportIssues.
 */
SettingsAccessor::IssueInfo SettingsAccessor::findIssues(const QVariantMap &data, const Utils::FileName &path) const
{
    SettingsAccessor::IssueInfo result;

    Utils::FileName defaultSettingsPath = project()->projectFilePath();
    defaultSettingsPath.appendString(m_userSuffix);

    int version = versionFromMap(data);
    if (!path.toFileInfo().exists()) {
        return result;
    } else if (data.isEmpty() || version < firstSupportedVersion() || version > currentVersion()) {
        result.title = QApplication::translate("Utils::SettingsAccessor", "No Valid Settings Found");
        result.message = QApplication::translate("Utils::SettingsAccessor",
                                                 "<p>No valid settings file could be found.</p>"
                                                 "<p>All settings files found in directory \"%1\" "
                                                 "were either too new or too old to be read.</p>")
                .arg(path.toUserOutput());
        result.buttons.insert(QMessageBox::Ok, DiscardAndContinue);
    } else if ((path != defaultSettingsPath) && (version < currentVersion())) {
        result.title = QApplication::translate("Utils::SettingsAccessor", "Using Old Settings");
        result.message = QApplication::translate("Utils::SettingsAccessor",
                                                 "<p>The versioned backup \"%1\" of the settings "
                                                 "file is used, because the non-versioned file was "
                                                 "created by an incompatible version of Qt Creator.</p>"
                                                 "<p>Settings changes made since the last time this "
                                                 "version of Qt Creator was used are ignored, and "
                                                 "changes made now will <b>not</b> be propagated to "
                                                 "the newer version.</p>").arg(path.toUserOutput());
        result.buttons.insert(QMessageBox::Ok, Continue);
    }

    if (!result.buttons.isEmpty())
        return result;

    QByteArray readId = environmentIdFromMap(data);
    if (!readId.isEmpty() && readId != creatorId()) {
        result.title = differentEnvironmentMsg(project()->displayName());
        result.message = QApplication::translate("ProjectExplorer::EnvironmentIdAccessor",
                                                 "<p>No .user settings file created by this instance "
                                                 "of Qt Creator was found.</p>"
                                                 "<p>Did you work with this project on another machine or "
                                                 "using a different settings path before?</p>"
                                                 "<p>Do you still want to load the settings file \"%1\"?</p>")
                .arg(path.toUserOutput());
        result.defaultButton = QMessageBox::No;
        result.escapeButton = QMessageBox::No;
        result.buttons.insert(QMessageBox::Yes, SettingsAccessor::Continue);
        result.buttons.insert(QMessageBox::No, SettingsAccessor::DiscardAndContinue);
    }
    return result;
}

QString SettingsAccessor::differentEnvironmentMsg(const QString &projectName)
{
    return QApplication::translate("ProjectExplorer::EnvironmentIdAccessor",
                                   "Settings File for \"%1\" from a different Environment?")
            .arg(projectName);
}

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namespace {

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// When restoring settings...
//   We check whether a .shared file exists. If so, we compare the settings in this file with
//   corresponding ones in the .user file. Whenever we identify a corresponding setting which
//   has a different value and which is not marked as sticky, we merge the .shared value into
//   the .user value.
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QVariantMap mergeSharedSettings(const QVariantMap &userMap, const QVariantMap &sharedMap)
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{
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    QVariantMap result = userMap;
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    if (sharedMap.isEmpty())
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        return result;
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    if (userMap.isEmpty())
        return sharedMap;
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    QSet<QString> stickyKeys;
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    const QVariant stickyList = result.take(QLatin1String(USER_STICKY_KEYS_KEY)).toList();
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    if (stickyList.isValid()) {
        if (stickyList.type() != QVariant::List) {
            // File is messed up... The user probably changed something.
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            return result;
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        }
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        foreach (const QVariant &v, stickyList.toList())
            stickyKeys.insert(v.toString());
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    }
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    // Do not override bookkeeping settings:
    stickyKeys.insert(QLatin1String(ORIGINAL_VERSION_KEY));
    stickyKeys.insert(QLatin1String(VERSION_KEY));

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    MergeSettingsOperation op(stickyKeys);
    op.synchronize(result, sharedMap);
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    return result;
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}

// When saving settings...
//   If a .shared file was considered in the previous restoring step, we check whether for
//   any of the current .shared settings there's a .user one which is different. If so, this
//   means the user explicitly changed it and we mark this setting as sticky.
//   Note that settings are considered sticky only when they differ from the .shared ones.
//   Although this approach is more flexible than permanent/forever sticky settings, it has
//   the side-effect that if a particular value unintentionally becomes the same in both
//   the .user and .shared files, this setting will "unstick".
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void trackUserStickySettings(QVariantMap &userMap, const QVariantMap &sharedMap)
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{
    if (sharedMap.isEmpty())
        return;

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    TrackStickyness op;
    op.synchronize(userMap, sharedMap);
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    userMap.insert(QLatin1String(USER_STICKY_KEYS_KEY), QVariant(op.stickySettings()));
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}

} // Anonymous

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QByteArray SettingsAccessor::environmentIdFromMap(const QVariantMap &data)
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{
    return data.value(QLatin1String(ENVIRONMENT_ID_KEY)).toByteArray();
}
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QVariantMap SettingsAccessor::restoreSettings(QWidget *parent) const
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{
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    if (d->lastVersion() < 0)
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        return QVariantMap();

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    QVariantMap userSettings = readUserSettings(parent);
    QVariantMap sharedSettings = readSharedSettings(parent);
    return mergeSettings(userSettings, sharedSettings);
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}

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bool SettingsAccessor::saveSettings(const QVariantMap &map, QWidget *parent) const
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{
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    if (map.isEmpty())
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        return false;

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    backupUserFile();

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    QVariantMap data = map;

    Utils::FileName path = FileName::fromString(defaultFileName(m_userSuffix));
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    const QVariant &shared = m_project->property(SHARED_SETTINGS);
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    if (shared.isValid())
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        trackUserStickySettings(data, shared.toMap());
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    if (!d->m_writer || d->m_writer->fileName() != path) {
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        delete d->m_writer;
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        d->m_writer = new PersistentSettingsWriter(path, QLatin1String("QtCreatorProject"));
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    }

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    data.insert(QLatin1String(VERSION_KEY), d->currentVersion());
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    // for compatibility with QtC 3.1 and older:
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    data.insert(QLatin1String(OBSOLETE_VERSION_KEY), d->currentVersion()); // TODO: Move into UserfileAccessor!
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    data.insert(QLatin1String(ENVIRONMENT_ID_KEY), SettingsAccessor::creatorId());
    return d->m_writer->save(data, parent);
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}

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bool SettingsAccessor::addVersionUpgrader(VersionUpgrader *upgrader)
{
    QTC_ASSERT(upgrader, return false);
    int version = upgrader->version();
    QTC_ASSERT(version >= 0, return false);
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    if (d->m_upgraders.isEmpty() || d->currentVersion() == version)
        d->m_upgraders.append(upgrader);
    else if (d->firstVersion() - 1 == version)
        d->m_upgraders.prepend(upgrader);
    else
        QTC_ASSERT(false, return false); // Upgrader was added out of sequence or twice
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    return true;
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}

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/* Will always return the default name first (if applicable) */
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QList<FileName> SettingsAccessor::settingsFiles(const QString &suffix) const
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{
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    QList<Utils::FileName> result;
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    const Utils::FileName baseName = project()->projectFilePath();
    QFileInfo fi = baseName.toFileInfo();
    QDir dir = QDir(fi.absolutePath());
    QString filter = fi.fileName() + suffix + QLatin1String("*");

    QFileInfoList list = dir.entryInfoList(QStringList() << filter, QDir::Files);
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    foreach (const QFileInfo &fi, list) {
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        const Utils::FileName path = Utils::FileName::fromString(fi.absoluteFilePath());
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        if (!result.contains(path)) {
            if (path.endsWith(suffix))
                result.prepend(path);
            else
                result.append(path);
        }
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    }
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    return result;
}

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QByteArray SettingsAccessor::creatorId()
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{
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    return ProjectExplorerPlugin::projectExplorerSettings().environmentId.toByteArray();
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}

QString SettingsAccessor::defaultFileName(const QString &suffix) const
{
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    return project()->projectFilePath().toString() + suffix;
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}

int SettingsAccessor::currentVersion() const
{
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    return d->currentVersion();
}

int SettingsAccessor::firstSupportedVersion() const
{
    return d->firstVersion();
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}

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void SettingsAccessor::backupUserFile() const
{
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    SettingsAccessorPrivate::Settings oldSettings;
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    oldSettings.path = FileName::fromString(defaultFileName(m_userSuffix));
    oldSettings.map = readFile(oldSettings.path);
    if (oldSettings.map.isEmpty())
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        return;

    // Do we need to do a backup?
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    const QString origName = oldSettings.path.toString();
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    QString backupName = origName;
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    const QByteArray oldEnvironmentId = environmentIdFromMap(oldSettings.map);
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    if (!oldEnvironmentId.isEmpty() && oldEnvironmentId != creatorId())
        backupName += QLatin1String(".") + QString::fromLatin1(oldEnvironmentId).mid(1, 7);
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    const int oldVersion = versionFromMap(oldSettings.map);
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    if (oldVersion != currentVersion()) {
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        VersionUpgrader *upgrader = d->upgrader(oldVersion);
        if (upgrader)
            backupName += QLatin1String(".") + upgrader->backupExtension();
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        else
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            backupName += QLatin1String(".") + QString::number(oldVersion);
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    }
    if (backupName != origName)
        QFile::copy(origName, backupName);
}

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QVariantMap SettingsAccessor::readUserSettings(QWidget *parent) const
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{
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    SettingsAccessorPrivate::Settings result;
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    QList<Utils::FileName> fileList = settingsFiles(m_userSuffix);
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    if (fileList.isEmpty()) // No settings found at all.
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        return result.map;
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    result = d->bestSettings(this, fileList);
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    if (result.path.isEmpty())
        result.path = project()->projectDirectory();

    ProceedInfo proceed = reportIssues(result.map, result.path, parent);
    if (proceed == DiscardAndContinue)
        return QVariantMap();
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    return result.map;
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}

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QVariantMap SettingsAccessor::readSharedSettings(QWidget *parent) const
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{
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    SettingsAccessorPrivate::Settings sharedSettings;
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    QString fn = project()->projectFilePath().toString() + m_sharedSuffix;
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    sharedSettings.path = FileName::fromString(fn);
    sharedSettings.map = readFile(sharedSettings.path);
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    if (versionFromMap(sharedSettings.map) > currentVersion()) {
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        // The shared file version is newer than Creator... If we have valid user
        // settings we prompt the user whether we could try an *unsupported* update.
        // This makes sense since the merging operation will only replace shared settings
        // that perfectly match corresponding user ones. If we don't have valid user
        // settings to compare against, there's nothing we can do.

        QMessageBox msgBox(
                    QMessageBox::Question,
                    QApplication::translate("ProjectExplorer::SettingsAccessor",
                                            "Unsupported Shared Settings File"),
                    QApplication::translate("ProjectExplorer::SettingsAccessor",
                                            "The version of your .shared file is not "
                                            "supported by Qt Creator. "
                                            "Do you want to try loading it anyway?"),
                    QMessageBox::Yes | QMessageBox::No,
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                    parent);
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        msgBox.setDefaultButton(QMessageBox::No);
        msgBox.setEscapeButton(QMessageBox::No);
        if (msgBox.exec() == QMessageBox::No)
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            sharedSettings.map.clear();
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        else
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            sharedSettings.map = setVersionInMap(sharedSettings.map, currentVersion());
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    }
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    return sharedSettings.map;
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}

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SettingsAccessorPrivate::Settings SettingsAccessorPrivate::bestSettings(const SettingsAccessor *accessor,
                                                                        const QList<Utils::FileName> &pathList)
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{
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    Settings bestMatch;
    foreach (const Utils::FileName &path, pathList) {
        QVariantMap tmp = accessor->readFile(path);
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        int version = Setting