// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0

#include "qtversionmanager.h"

#include "baseqtversion.h"
#include "exampleslistmodel.h"
#include "qtsupportconstants.h"
#include "qtversionfactory.h"

#include <coreplugin/icore.h>
#include <coreplugin/helpmanager.h>

#include <extensionsystem/pluginmanager.h>

#include <projectexplorer/toolchainmanager.h>

#include <utils/algorithm.h>
#include <utils/buildablehelperlibrary.h>
#include <utils/environment.h>
#include <utils/filesystemwatcher.h>
#include <utils/hostosinfo.h>
#include <utils/persistentsettings.h>
#include <utils/qtcprocess.h>
#include <utils/qtcassert.h>

#include <nanotrace/nanotrace.h>

#include <QDir>
#include <QFile>
#include <QLoggingCategory>
#include <QStandardPaths>
#include <QStringList>
#include <QTextStream>
#include <QTimer>

using namespace ProjectExplorer;
using namespace Utils;

namespace QtSupport {

using namespace Internal;

const char QTVERSION_DATA_KEY[] = "QtVersion.";
const char QTVERSION_TYPE_KEY[] = "QtVersion.Type";
const char QTVERSION_FILE_VERSION_KEY[] = "Version";
const char QTVERSION_FILENAME[] = "qtversion.xml";

using VersionMap = QMap<int, QtVersion *>;
static VersionMap m_versions;

const char DOCUMENTATION_SETTING_KEY[] = "QtSupport/DocumentationSetting";

QVector<ExampleSetModel::ExtraExampleSet> m_pluginRegisteredExampleSets;


static Q_LOGGING_CATEGORY(log, "qtc.qt.versions", QtWarningMsg);

QtVersionManager *QtVersionManager::instance()
{
    static QtVersionManager theSignals;
    return &theSignals;
}

static FilePath globalSettingsFileName()
{
    return Core::ICore::installerResourcePath(QTVERSION_FILENAME);
}

static FilePath settingsFileName(const QString &path)
{
    return Core::ICore::userResourcePath(path);
}

// prefer newer qts otherwise compare on id
bool qtVersionNumberCompare(QtVersion *a, QtVersion *b)
{
    return a->qtVersion() > b->qtVersion() || (a->qtVersion() == b->qtVersion() && a->uniqueId() < b->uniqueId());
}
QVector<ExampleSetModel::ExtraExampleSet> ExampleSetModel::pluginRegisteredExampleSets()
{
    return m_pluginRegisteredExampleSets;
}

// QtVersionManager

static PersistentSettingsWriter *m_writer = nullptr;

class QtVersionManagerImpl : public QObject
{
public:
    QtVersionManagerImpl(QObject *parent)
        : QObject(parent)
    {
        qRegisterMetaType<FilePath>();

        // Give the file a bit of time to settle before reading it...
        m_fileWatcherTimer.setInterval(2000);
        connect(&m_fileWatcherTimer, &QTimer::timeout, this, [this] { updateFromInstaller(); });

        connect(ToolchainManager::instance(), &ToolchainManager::toolchainsLoaded,
                this, &QtVersionManagerImpl::triggerQtVersionRestore);
    }

    void shutdown()
    {
        delete m_writer;
        m_writer = nullptr;
        delete m_configFileWatcher;
        m_configFileWatcher = nullptr;
        qDeleteAll(m_versions);
        m_versions.clear();
    }

    void updateFromInstaller(bool emitSignal = true);
    void triggerQtVersionRestore();

    bool restoreQtVersions();
    void findSystemQt();
    void saveQtVersions();

    void updateDocumentation(const QtVersions &added,
                             const QtVersions &removed,
                             const QtVersions &allNew,
                             bool updateBlockedDocumentation = false);

    void setNewQtVersions(const QtVersions &newVersions);
    QString qmakePath(const QString &qtchooser, const QString &version);

    QList<QByteArray> runQtChooser(const QString &qtchooser, const QStringList &arguments);
    FilePaths gatherQmakePathsFromQtChooser();

    int m_idcount = 1;
    // managed by QtProjectManagerPlugin
    FileSystemWatcher *m_configFileWatcher = nullptr;
    QTimer m_fileWatcherTimer;
};

static QObject *s_guard = nullptr;

void Internal::setupQtVersionManager(QObject *guard)
{
    s_guard = guard;
}

QtVersionManagerImpl &qtVersionManagerImpl()
{
    QTC_CHECK(s_guard);
    static auto theQtVersionManager = new QtVersionManagerImpl(s_guard);
    return *theQtVersionManager;
}

void QtVersionManagerImpl::triggerQtVersionRestore()
{
    NANOTRACE_SCOPE("QtSupport", "QtVersionManagerImpl::triggerQtVersionRestore");
    disconnect(ToolchainManager::instance(),
               &ToolchainManager::toolchainsLoaded,
               this,
               &QtVersionManagerImpl::triggerQtVersionRestore);

    bool success = restoreQtVersions();
    updateFromInstaller(false);
    if (!success) {
        // We did neither restore our settings or upgraded
        // in that case figure out if there's a qt in path
        // and add it to the Qt versions
        findSystemQt();
        if (m_versions.size())
            saveQtVersions();
    }

    {
        NANOTRACE_SCOPE("QtSupport", "QtVersionManagerImpl::qtVersionsLoaded");
        emit QtVersionManager::instance()->qtVersionsLoaded();
    }
    emit QtVersionManager::instance()->qtVersionsChanged(m_versions.keys());

    const FilePath configFileName = globalSettingsFileName();
    if (configFileName.exists()) {
        m_configFileWatcher = new FileSystemWatcher(this);
        connect(m_configFileWatcher, &FileSystemWatcher::fileChanged,
                &m_fileWatcherTimer, QOverload<>::of(&QTimer::start));
        m_configFileWatcher->addFile(configFileName, FileSystemWatcher::WatchModifiedDate);
    } // exists

    const QtVersions vs = QtVersionManager::versions();
    updateDocumentation(vs, {}, vs, /*updateBlockedDocumentation=*/true);
}

bool QtVersionManager::isLoaded()
{
    return m_writer != nullptr;
}

void QtVersionManager::initialized()
{
    // Force creation. FIXME: Remove.
    qtVersionManagerImpl();
}

void QtVersionManager::shutdown()
{
    qtVersionManagerImpl().shutdown();
}

bool QtVersionManagerImpl::restoreQtVersions()
{
    QTC_ASSERT(!m_writer, return false);
    m_writer = new PersistentSettingsWriter(settingsFileName(QTVERSION_FILENAME),
                                            "QtCreatorQtVersions");

    const QList<QtVersionFactory *> factories = QtVersionFactory::allQtVersionFactories();

    PersistentSettingsReader reader;
    const FilePath filename = settingsFileName(QTVERSION_FILENAME);

    if (!reader.load(filename))
        return false;
    Store data = reader.restoreValues();

    // Check version:
    const int version = data.value(QTVERSION_FILE_VERSION_KEY, 0).toInt();
    if (version < 1)
        return false;

    const QByteArray keyPrefix(QTVERSION_DATA_KEY);
    const Store::ConstIterator dcend = data.constEnd();
    for (Store::ConstIterator it = data.constBegin(); it != dcend; ++it) {
        const Key &key = it.key();
        if (!key.view().startsWith(keyPrefix))
            continue;
        bool ok;
        int count = key.toByteArray().mid(keyPrefix.size()).toInt(&ok);
        if (!ok || count < 0)
            continue;

        const Store qtversionMap = storeFromVariant(it.value());
        const QString type = qtversionMap.value(QTVERSION_TYPE_KEY).toString();

        bool restored = false;
        for (QtVersionFactory *f : factories) {
            if (f->canRestore(type)) {
                if (QtVersion *qtv = f->restore(type, qtversionMap, reader.filePath())) {
                    if (m_versions.contains(qtv->uniqueId())) {
                        // This shouldn't happen, we are restoring the same id multiple times?
                        qWarning() << "A Qt version with id"<<qtv->uniqueId()<<"already exists";
                        delete qtv;
                    } else {
                        m_versions.insert(qtv->uniqueId(), qtv);
                        m_idcount = qtv->uniqueId() > m_idcount ? qtv->uniqueId() : m_idcount;
                        restored = true;
                        break;
                    }
                }
            }
        }
        if (!restored)
            qWarning("Warning: Unable to restore Qt version '%s' stored in %s.",
                     qPrintable(type),
                     qPrintable(filename.toUserOutput()));
    }
    ++m_idcount;

    return true;
}

void QtVersionManagerImpl::updateFromInstaller(bool emitSignal)
{
    m_fileWatcherTimer.stop();

    const FilePath path = globalSettingsFileName();
    // Handle overwritting of data:
    if (m_configFileWatcher) {
        m_configFileWatcher->removeFile(path);
        m_configFileWatcher->addFile(path, FileSystemWatcher::WatchModifiedDate);
    }

    QList<int> added;
    QList<int> removed;
    QList<int> changed;

    const QList<QtVersionFactory *> factories = QtVersionFactory::allQtVersionFactories();
    PersistentSettingsReader reader;
    Store data;
    if (reader.load(path))
        data = reader.restoreValues();

    if (log().isDebugEnabled()) {
        qCDebug(log) << "======= Existing Qt versions =======";
        for (QtVersion *version : std::as_const(m_versions)) {
            qCDebug(log) << version->qmakeFilePath().toUserOutput() << "id:"<<version->uniqueId();
            qCDebug(log) << "  autodetection source:" << version->detectionSource();
            qCDebug(log) << "";
        }
        qCDebug(log)<< "======= Adding sdk versions =======";
    }

    QStringList sdkVersions;

    const QByteArray keyPrefix(QTVERSION_DATA_KEY);
    const Store::ConstIterator dcend = data.constEnd();
    for (Store::ConstIterator it = data.constBegin(); it != dcend; ++it) {
        const Key &key = it.key();
        if (!key.view().startsWith(keyPrefix))
            continue;
        bool ok;
        int count = key.toByteArray().mid(keyPrefix.size()).toInt(&ok);
        if (!ok || count < 0)
            continue;

        Store qtversionMap = storeFromVariant(it.value());
        const QString type = qtversionMap.value(QTVERSION_TYPE_KEY).toString();
        const QString autoDetectionSource = qtversionMap.value("autodetectionSource").toString();
        sdkVersions << autoDetectionSource;
        int id = -1; // see QtVersion::fromMap()
        QtVersionFactory *factory = nullptr;
        for (QtVersionFactory *f : factories) {
            if (f->canRestore(type))
                factory = f;
        }
        if (!factory) {
            qCDebug(log, "Warning: Unable to find factory for type '%s'", qPrintable(type));
            continue;
        }
        // First try to find a existing Qt version to update
        bool restored = false;
        const VersionMap versionsCopy = m_versions; // m_versions is modified in loop
        for (QtVersion *v : versionsCopy) {
            if (v->detectionSource() == autoDetectionSource) {
                id = v->uniqueId();
                qCDebug(log) << " Qt version found with same autodetection source" << autoDetectionSource << " => Migrating id:" << id;
                m_versions.remove(id);
                qtversionMap[Constants::QTVERSIONID] = id;
                qtversionMap[Constants::QTVERSIONNAME] = v->unexpandedDisplayName();
                delete v;

                if (QtVersion *qtv = factory->restore(type, qtversionMap, reader.filePath())) {
                    Q_ASSERT(qtv->isAutodetected());
                    m_versions.insert(id, qtv);
                    restored = true;
                }
                if (restored)
                    changed << id;
                else
                    removed << id;
            }
        }
        // Create a new qtversion
        if (!restored) { // didn't replace any existing versions
            qCDebug(log) << " No Qt version found matching" << autoDetectionSource << " => Creating new version";
            if (QtVersion *qtv = factory->restore(type, qtversionMap, reader.filePath())) {
                Q_ASSERT(qtv->isAutodetected());
                m_versions.insert(qtv->uniqueId(), qtv);
                added << qtv->uniqueId();
                restored = true;
            }
        }
        if (!restored) {
            qCDebug(log, "Warning: Unable to update qtversion '%s' from sdk installer.",
                    qPrintable(autoDetectionSource));
        }
    }

    if (log().isDebugEnabled()) {
        qCDebug(log) << "======= Before removing outdated sdk versions =======";
        for (QtVersion *version : std::as_const(m_versions)) {
            qCDebug(log) << version->qmakeFilePath().toUserOutput() << "id:" << version->uniqueId();
            qCDebug(log) << "  autodetection source:" << version->detectionSource();
            qCDebug(log) << "";
        }
    }
    const VersionMap versionsCopy = m_versions; // m_versions is modified in loop
    for (QtVersion *qtVersion : versionsCopy) {
        if (qtVersion->detectionSource().startsWith("SDK.")) {
            if (!sdkVersions.contains(qtVersion->detectionSource())) {
                qCDebug(log) << "  removing version" << qtVersion->detectionSource();
                m_versions.remove(qtVersion->uniqueId());
                removed << qtVersion->uniqueId();
            }
        }
    }

    if (log().isDebugEnabled()) {
        qCDebug(log)<< "======= End result =======";
        for (QtVersion *version : std::as_const(m_versions)) {
            qCDebug(log) << version->qmakeFilePath().toUserOutput() << "id:" << version->uniqueId();
            qCDebug(log) << "  autodetection source:" << version->detectionSource();
            qCDebug(log) << "";
        }
    }
    if (emitSignal)
        emit QtVersionManager::instance()->qtVersionsChanged(added, removed, changed);
}

void QtVersionManagerImpl::saveQtVersions()
{
    if (!m_writer)
        return;

    Store data;
    data.insert(QTVERSION_FILE_VERSION_KEY, 1);

    int count = 0;
    for (QtVersion *qtv : std::as_const(m_versions)) {
        Store tmp = qtv->toMap();
        if (tmp.isEmpty())
            continue;
        tmp.insert(QTVERSION_TYPE_KEY, qtv->type());
        data.insert(numberedKey(QTVERSION_DATA_KEY, count), variantFromStore(tmp));
        ++count;
    }
    m_writer->save(data, Core::ICore::dialogParent());
}

// Executes qtchooser with arguments in a process and returns its output
QList<QByteArray> QtVersionManagerImpl::runQtChooser(const QString &qtchooser, const QStringList &arguments)
{
    Process p;
    p.setCommand({FilePath::fromString(qtchooser), arguments});
    p.start();
    p.waitForFinished();
    const bool success = p.exitCode() == 0;
    return success ? p.rawStdOut().split('\n') : QList<QByteArray>();
}

// Asks qtchooser for the qmake path of a given version
QString QtVersionManagerImpl::qmakePath(const QString &qtchooser, const QString &version)
{
    const QList<QByteArray> outputs = runQtChooser(qtchooser,
                                                   {QStringLiteral("-qt=%1").arg(version),
                                                    QStringLiteral("-print-env")});
    for (const QByteArray &output : outputs) {
        if (output.startsWith("QTTOOLDIR=\"")) {
            QByteArray withoutVarName = output.mid(11); // remove QTTOOLDIR="
            withoutVarName.chop(1); // remove trailing quote
            return QStandardPaths::findExecutable(QStringLiteral("qmake"), QStringList()
                                                  << QString::fromLocal8Bit(withoutVarName));
        }
    }
    return QString();
}

FilePaths QtVersionManagerImpl::gatherQmakePathsFromQtChooser()
{
    const QString qtchooser = QStandardPaths::findExecutable(QStringLiteral("qtchooser"));
    if (qtchooser.isEmpty())
        return {};

    const QList<QByteArray> versions = runQtChooser(qtchooser, QStringList("-l"));
    QSet<FilePath> foundQMakes;
    for (const QByteArray &version : versions) {
        FilePath possibleQMake = FilePath::fromString(
                    qmakePath(qtchooser, QString::fromLocal8Bit(version)));
        if (!possibleQMake.isEmpty())
            foundQMakes << possibleQMake;
    }
    return Utils::toList(foundQMakes);
}

void QtVersionManagerImpl::findSystemQt()
{
    FilePaths systemQMakes
            = BuildableHelperLibrary::findQtsInEnvironment(Environment::systemEnvironment());
    systemQMakes.append(gatherQmakePathsFromQtChooser());
    for (const FilePath &qmakePath : std::as_const(systemQMakes)) {
        if (BuildableHelperLibrary::isQtChooser(qmakePath))
            continue;
        const auto isSameQmake = [qmakePath](const QtVersion *version) {
            return qmakePath.isSameExecutable(version->qmakeFilePath());
        };
        if (contains(m_versions, isSameQmake))
            continue;
        QtVersion *version = QtVersionFactory::createQtVersionFromQMakePath(qmakePath,
                                                                                false,
                                                                                "PATH");
        if (version)
            m_versions.insert(version->uniqueId(), version);
    }
}

void QtVersionManager::addVersion(QtVersion *version)
{
    QTC_ASSERT(version, return);
    if (m_versions.contains(version->uniqueId()))
        return;

    int uniqueId = version->uniqueId();
    m_versions.insert(uniqueId, version);

    emit QtVersionManager::instance()->qtVersionsChanged({uniqueId});
    qtVersionManagerImpl().saveQtVersions();
}

void QtVersionManager::removeVersion(QtVersion *version)
{
    QTC_ASSERT(version, return);
    m_versions.remove(version->uniqueId());
    emit QtVersionManager::instance()->qtVersionsChanged({}, {version->uniqueId()});
    qtVersionManagerImpl().saveQtVersions();
    delete version;
}

void QtVersionManager::registerExampleSet(const QString &displayName,
                                          const QString &manifestPath,
                                          const QString &examplesPath)
{
    m_pluginRegisteredExampleSets.append({displayName, manifestPath, examplesPath});
}

using Path = QString;
using FileName = QString;
using DocumentationFile = std::pair<Path, FileName>;
using DocumentationFiles = QList<DocumentationFile>;
using AllDocumentationFiles = QHash<QtVersion *, DocumentationFiles>;

static DocumentationFiles allDocumentationFiles(QtVersion *v)
{
    DocumentationFiles files;
    const QStringList docPaths = QStringList(
        {v->docsPath().toString() + QChar('/'), v->docsPath().toString() + "/qch/"});
    for (const QString &docPath : docPaths) {
        const QDir versionHelpDir(docPath);
        for (const QString &helpFile : versionHelpDir.entryList(QStringList("q*.qch"), QDir::Files))
            files.append({docPath, helpFile});
    }
    return files;
}

static AllDocumentationFiles allDocumentationFiles(const QtVersions &versions)
{
    AllDocumentationFiles result;
    for (QtVersion *v : versions)
        result.insert(v, allDocumentationFiles(v));
    return result;
}

static QStringList documentationFiles(const QtVersions &vs,
                                      const AllDocumentationFiles &allDocumentationFiles,
                                      bool highestOnly = false)
{
    // if highestOnly is true, register each file only once per major Qt version, even if
    // multiple minor or patch releases of that major version are installed
    QHash<int, QSet<QString>> includedFileNames; // major Qt version -> names
    QSet<QString> filePaths;
    const QtVersions versions = highestOnly ? QtVersionManager::sortVersions(vs) : vs;
    for (QtVersion *v : versions) {
        const int majorVersion = v->qtVersion().majorVersion();
        QSet<QString> &majorVersionFileNames = includedFileNames[majorVersion];
        const DocumentationFiles files = allDocumentationFiles.value(v);
        for (const std::pair<Path, FileName> &file : files) {
            if (!highestOnly || !majorVersionFileNames.contains(file.second)) {
                filePaths.insert(file.first + file.second);
                majorVersionFileNames.insert(file.second);
            }
        }
    }
    return filePaths.values();
}

static QStringList documentationFiles(const QtVersions &vs)
{
    return documentationFiles(vs, allDocumentationFiles(vs));
}

void QtVersionManagerImpl::updateDocumentation(const QtVersions &added,
                                               const QtVersions &removed,
                                               const QtVersions &allNew,
                                               bool updateBlockedDocumentation)
{
    using DocumentationSetting = QtVersionManager::DocumentationSetting;
    const DocumentationSetting setting = QtVersionManager::documentationSetting();
    const AllDocumentationFiles allNewDocFiles = allDocumentationFiles(allNew);
    const QStringList docsOfAll = setting == DocumentationSetting::None
                                      ? QStringList()
                                      : documentationFiles(allNew,
                                                           allNewDocFiles,
                                                           setting
                                                               == DocumentationSetting::HighestOnly);
    const QStringList docsToRemove = Utils::filtered(documentationFiles(removed),
                                                     [&docsOfAll](const QString &f) {
                                                         return !docsOfAll.contains(f);
                                                     });
    const QStringList docsToAdd = Utils::filtered(documentationFiles(added),
                                                  [&docsOfAll](const QString &f) {
                                                      return docsOfAll.contains(f);
                                                  });

    if (updateBlockedDocumentation) {
        // The online installer registers documentation for Qt versions explicitly via an install
        // setting, which defeats that we only register the Qt versions matching the setting.
        // So the Qt support explicitly blocks the files that we do _not_ want to register, so the
        // Help plugin knows about this.
        const QSet<QString> reallyAllFiles = toSet(documentationFiles(allNew, allNewDocFiles));
        const QSet<QString> toBlock = reallyAllFiles - toSet(docsOfAll);
        Core::HelpManager::setBlockedDocumentation(toList(toBlock));
    }

    Core::HelpManager::unregisterDocumentation(docsToRemove);
    Core::HelpManager::registerDocumentation(docsToAdd);
}

int QtVersionManager::getUniqueId()
{
    return qtVersionManagerImpl().m_idcount++;
}

QtVersions QtVersionManager::versions(const QtVersion::Predicate &predicate)
{
    QtVersions versions;
    QTC_ASSERT(isLoaded(), return versions);
    if (predicate)
        return Utils::filtered(m_versions.values(), predicate);
    return m_versions.values();
}

QtVersions QtVersionManager::sortVersions(const QtVersions &input)
{
    return Utils::sorted(input, qtVersionNumberCompare);
}

QtVersion *QtVersionManager::version(int id)
{
    QTC_ASSERT(isLoaded(), return nullptr);
    VersionMap::const_iterator it = m_versions.constFind(id);
    if (it == m_versions.constEnd())
        return nullptr;
    return it.value();
}

QtVersion *QtVersionManager::version(const QtVersion::Predicate &predicate)
{
    return Utils::findOrDefault(m_versions.values(), predicate);
}

// This function is really simplistic...
static bool equals(QtVersion *a, QtVersion *b)
{
    return a->equals(b);
}

void QtVersionManager::setNewQtVersions(const QtVersions &newVersions)
{
    qtVersionManagerImpl().setNewQtVersions(newVersions);
}

void QtVersionManagerImpl::setNewQtVersions(const QtVersions &newVersions)
{
    // We want to preserve the same order as in the settings dialog
    // so we sort a copy
    const QtVersions sortedNewVersions = Utils::sorted(newVersions, &QtVersion::uniqueId);

    QtVersions addedVersions;
    QtVersions removedVersions;
    QList<std::pair<QtVersion *, QtVersion *>> changedVersions;
    // So we trying to find the minimal set of changed versions,
    // iterate over both sorted list

    // newVersions and oldVersions iterator
    QtVersions::const_iterator nit, nend;
    VersionMap::const_iterator oit, oend;
    nit = sortedNewVersions.constBegin();
    nend = sortedNewVersions.constEnd();
    oit = m_versions.constBegin();
    oend = m_versions.constEnd();

    while (nit != nend && oit != oend) {
        int nid = (*nit)->uniqueId();
        int oid = (*oit)->uniqueId();
        if (nid < oid) {
            addedVersions.push_back(*nit);
            ++nit;
        } else if (oid < nid) {
            removedVersions.push_back(*oit);
            ++oit;
        } else {
            if (!equals(*oit, *nit))
                changedVersions.push_back({*oit, *nit});
            ++oit;
            ++nit;
        }
    }

    while (nit != nend) {
        addedVersions.push_back(*nit);
        ++nit;
    }

    while (oit != oend) {
        removedVersions.push_back(*oit);
        ++oit;
    }

    if (!changedVersions.isEmpty() || !addedVersions.isEmpty() || !removedVersions.isEmpty()) {
        const QtVersions changedOldVersions
            = Utils::transform(changedVersions, &std::pair<QtVersion *, QtVersion *>::first);
        const QtVersions changedNewVersions
            = Utils::transform(changedVersions,
                               &std::pair<QtVersion *, QtVersion *>::second);
        updateDocumentation(addedVersions + changedNewVersions,
                            removedVersions + changedOldVersions,
                            sortedNewVersions);
    }
    const QList<int> addedIds = Utils::transform(addedVersions, &QtVersion::uniqueId);
    const QList<int> removedIds = Utils::transform(removedVersions, &QtVersion::uniqueId);
    const QList<int> changedIds = Utils::transform(changedVersions,
                                                   [](std::pair<QtVersion *, QtVersion *> v) {
                                                       return v.first->uniqueId();
                                                   });

    qDeleteAll(m_versions);
    m_versions = Utils::transform<VersionMap>(sortedNewVersions, [](QtVersion *v) {
        return std::make_pair(v->uniqueId(), v);
    });
    saveQtVersions();

    if (!changedVersions.isEmpty() || !addedVersions.isEmpty() || !removedVersions.isEmpty())
        emit QtVersionManager::instance()->qtVersionsChanged(addedIds, removedIds, changedIds);
}

void QtVersionManager::setDocumentationSetting(const QtVersionManager::DocumentationSetting &setting)
{
    if (setting == documentationSetting())
        return;
    Core::ICore::settings()->setValueWithDefault(DOCUMENTATION_SETTING_KEY, int(setting), 0);
    // force re-evaluating which documentation should be registered
    // by claiming that all are removed and re-added
    const QtVersions vs = versions();
    qtVersionManagerImpl().updateDocumentation(vs, vs, vs);
}

QtVersionManager::DocumentationSetting QtVersionManager::documentationSetting()
{
    return DocumentationSetting(
        Core::ICore::settings()->value(DOCUMENTATION_SETTING_KEY, 0).toInt());
}

} // namespace QtVersion