/****************************************************************************
**
** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** 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 Digia.  For licensing terms and
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** use the contact form at http://qt.digia.com/contact-us.
**
** GNU Lesser General Public License Usage
** 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
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
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****************************************************************************/

#include "session.h"

#include "project.h"
#include "projectexplorer.h"
#include "projectexplorerconstants.h"
#include "nodesvisitor.h"
#include "editorconfiguration.h"
#include "projectnodes.h"

#include <coreplugin/icore.h>
#include <coreplugin/imode.h>
#include <coreplugin/documentmanager.h>
#include <coreplugin/editormanager/editormanager.h>
#include <coreplugin/editormanager/ieditor.h>
#include <coreplugin/coreconstants.h>
#include <coreplugin/progressmanager/progressmanager.h>
#include <coreplugin/modemanager.h>

#include <texteditor/itexteditor.h>

#include <utils/listutils.h>
#include <utils/qtcassert.h>
#include <utils/stylehelper.h>

#include <QDebug>
#include <QDir>
#include <QFileInfo>
#include <QFuture>
#include <QSettings>
#include <QTimer>

#include <QApplication>
#include <QMessageBox>
#include <QPushButton>
#include <QTextCodec>

namespace {
    bool debug = false;
}

using namespace Core;
using Utils::PersistentSettingsReader;
using Utils::PersistentSettingsWriter;

using namespace ProjectExplorer;
using namespace ProjectExplorer::Internal;

/*!
     \class ProjectExplorer::SessionManager

     \brief Session management.

     TODO the interface of this class is not really great.
     The implementation suffers that all the functions from the
     public interface just wrap around functions which do the actual work
     This could be improved.
*/

SessionManager::SessionManager(QObject *parent)
  : QObject(parent),
    m_sessionNode(new SessionNode(this)),
    m_sessionName(QLatin1String("default")),
    m_virginSession(true),
    m_loadingSession(false),
    m_startupProject(0),
    m_writer(0)
{
    connect(ModeManager::instance(), SIGNAL(currentModeChanged(Core::IMode*)),
            this, SLOT(saveActiveMode(Core::IMode*)));

    EditorManager *em = ICore::editorManager();

    connect(em, SIGNAL(editorCreated(Core::IEditor*,QString)),
            this, SLOT(configureEditor(Core::IEditor*,QString)));
    connect(ProjectExplorerPlugin::instance(), SIGNAL(currentProjectChanged(ProjectExplorer::Project*)),
            this, SLOT(updateWindowTitle()));
    connect(em, SIGNAL(editorOpened(Core::IEditor*)),
            this, SLOT(markSessionFileDirty()));
    connect(em, SIGNAL(editorsClosed(QList<Core::IEditor*>)),
            this, SLOT(markSessionFileDirty()));
}

SessionManager::~SessionManager()
{
    emit aboutToUnloadSession(m_sessionName);
    delete m_writer;
}


bool SessionManager::isDefaultVirgin() const
{
    return isDefaultSession(m_sessionName)
            && m_virginSession;
}

bool SessionManager::isDefaultSession(const QString &session) const
{
    return session == QLatin1String("default");
}


void SessionManager::saveActiveMode(Core::IMode *mode)
{
    setValue(QLatin1String("ActiveMode"), mode->id().toString());
}

void SessionManager::clearProjectFileCache()
{
    // If triggered by the fileListChanged signal of one project
    // only invalidate cache for this project
    Project *pro = qobject_cast<Project*>(sender());
    if (pro)
        m_projectFileCache.remove(pro);
    else
        m_projectFileCache.clear();
}

bool SessionManager::recursiveDependencyCheck(const QString &newDep, const QString &checkDep) const
{
    if (newDep == checkDep)
        return false;

    foreach (const QString &dependency, m_depMap.value(checkDep)) {
        if (!recursiveDependencyCheck(newDep, dependency))
            return false;
    }

    return true;
}

/*
 * The dependency management exposes an interface based on projects, but
 * is internally purely string based. This is suboptimal. Probably it would be
 * nicer to map the filenames to projects on load and only map it back to
 * filenames when saving.
 */

QList<Project *> SessionManager::dependencies(const Project *project) const
{
    const QString &proName = project->document()->fileName();
    const QStringList &proDeps = m_depMap.value(proName);

    QList<Project *> projects;
    foreach (const QString &dep, proDeps) {
        if (Project *pro = projectForFile(dep))
            projects += pro;
    }

    return projects;
}

bool SessionManager::hasDependency(const Project *project, const Project *depProject) const
{
    const QString &proName = project->document()->fileName();
    const QString &depName = depProject->document()->fileName();

    const QStringList &proDeps = m_depMap.value(proName);
    return proDeps.contains(depName);
}

bool SessionManager::canAddDependency(const Project *project, const Project *depProject) const
{
    const QString &newDep = project->document()->fileName();
    const QString &checkDep = depProject->document()->fileName();

    return recursiveDependencyCheck(newDep, checkDep);
}

bool SessionManager::addDependency(Project *project, Project *depProject)
{
    const QString &proName = project->document()->fileName();
    const QString &depName = depProject->document()->fileName();

    // check if this dependency is valid
    if (!recursiveDependencyCheck(proName, depName))
        return false;

    QStringList proDeps = m_depMap.value(proName);
    if (!proDeps.contains(depName)) {
        proDeps.append(depName);
        m_depMap[proName] = proDeps;
    }
    emit dependencyChanged(project, depProject);

    return true;
}

void SessionManager::removeDependency(Project *project, Project *depProject)
{
    const QString &proName = project->document()->fileName();
    const QString &depName = depProject->document()->fileName();

    QStringList proDeps = m_depMap.value(proName);
    proDeps.removeAll(depName);
    if (proDeps.isEmpty())
        m_depMap.remove(proName);
    else
        m_depMap[proName] = proDeps;
    emit dependencyChanged(project, depProject);
}

void SessionManager::setStartupProject(Project *startupProject)
{
    if (debug)
        qDebug() << Q_FUNC_INFO << (startupProject ? startupProject->displayName() : QLatin1String("0"));

    if (startupProject) {
        Q_ASSERT(m_projects.contains(startupProject));
    }

    if (m_startupProject == startupProject)
        return;

    m_startupProject = startupProject;
    emit startupProjectChanged(startupProject);
}

Project *SessionManager::startupProject() const
{
    return m_startupProject;
}

void SessionManager::addProject(Project *project)
{
    addProjects(QList<Project*>() << project);
}

void SessionManager::addProjects(const QList<Project*> &projects)
{
    m_virginSession = false;
    QList<Project*> clearedList;
    foreach (Project *pro, projects) {
        if (!m_projects.contains(pro)) {
            clearedList.append(pro);
            m_projects.append(pro);
            m_sessionNode->addProjectNodes(QList<ProjectNode *>() << pro->rootProjectNode());

            connect(pro, SIGNAL(fileListChanged()),
                    this, SLOT(clearProjectFileCache()));

            connect(pro, SIGNAL(displayNameChanged()),
                    this, SLOT(projectDisplayNameChanged()));

            if (debug)
                qDebug() << "SessionManager - adding project " << pro->displayName();
        }
    }

    foreach (Project *pro, clearedList) {
        emit projectAdded(pro);
    }

    if (clearedList.count() == 1)
        emit singleProjectAdded(clearedList.first());
}

void SessionManager::removeProject(Project *project)
{
    m_virginSession = false;
    if (project == 0) {
        qDebug() << "SessionManager::removeProject(0) ... THIS SHOULD NOT HAPPEN";
        return;
    }
    removeProjects(QList<Project*>() << project);
}

bool SessionManager::loadingSession()
{
    return m_loadingSession;
}

bool SessionManager::save()
{
    if (debug)
        qDebug() << "SessionManager - saving session" << m_sessionName;

    emit aboutToSaveSession();

    if (!m_writer || m_writer->fileName() != sessionNameToFileName(m_sessionName)) {
        delete m_writer;
        m_writer = new Utils::PersistentSettingsWriter(sessionNameToFileName(m_sessionName),
                                                       QLatin1String("QtCreatorSession"));
    }

    QVariantMap data;
    // save the startup project
    if (m_startupProject)
        data.insert(QLatin1String("StartupProject"), m_startupProject->document()->fileName());

    QColor c = Utils::StyleHelper::requestedBaseColor();
    if (c.isValid()) {
        QString tmp = QString::fromLatin1("#%1%2%3")
                .arg(c.red(), 2, 16, QLatin1Char('0'))
                .arg(c.green(), 2, 16, QLatin1Char('0'))
                .arg(c.blue(), 2, 16, QLatin1Char('0'));
        data.insert(QLatin1String("Color"), tmp);
    }

    QStringList projectFiles;
    foreach (Project *pro, m_projects)
        projectFiles << pro->document()->fileName();

    // Restore infromation on projects that failed to load:
    // don't readd projects to the list, which the user loaded
    foreach (const QString &failed, m_failedProjects)
        if (!projectFiles.contains(failed))
            projectFiles << failed;

    data.insert(QLatin1String("ProjectList"), projectFiles);

    QMap<QString, QVariant> depMap;
    QMap<QString, QStringList>::const_iterator i = m_depMap.constBegin();
    while (i != m_depMap.constEnd()) {
        QString key = i.key();
        QStringList values;
        foreach (const QString &value, i.value()) {
            values << value;
        }
        depMap.insert(key, values);
        ++i;
    }
    data.insert(QLatin1String("ProjectDependencies"), QVariant(depMap));

    int editorCount = 0;
    QList<Core::IEditor *> editors = ICore::editorManager()->openedEditors();
    foreach (Core::IEditor *editor, editors) {
        Q_ASSERT(editor);
        if (!editor->isTemporary())
            ++editorCount;
    }
    data.insert(QLatin1String("OpenEditors"), editorCount);
    data.insert(QLatin1String("EditorSettings"), ICore::editorManager()->saveState().toBase64());

    QMap<QString, QVariant>::const_iterator it, end;
    end = m_values.constEnd();
    QStringList keys;
    for (it = m_values.constBegin(); it != end; ++it) {
        data.insert(QLatin1String("value-") + it.key(), it.value());
        keys << it.key();
    }

    data.insert(QLatin1String("valueKeys"), keys);

    bool result = m_writer->save(data, Core::ICore::mainWindow());
    if (!result) {
        QMessageBox::warning(0, tr("Error while saving session"),
                                tr("Could not save session to file %1").arg(m_writer->fileName().toUserOutput()));
    }

    if (debug)
        qDebug() << "SessionManager - saving session returned " << result;

    return result;
}

/*!
  \fn bool SessionManager::closeAllProjects()

  Closes all projects
  */
void SessionManager::closeAllProjects()
{
    setStartupProject(0);
    removeProjects(projects());
}

const QList<Project *> &SessionManager::projects() const
{
    return m_projects;
}

QStringList SessionManager::dependencies(const QString &proName) const
{
    QStringList result;
    foreach (const QString &dep, m_depMap.value(proName))
        result += dependencies(dep);

    result << proName;
    return result;
}

QStringList SessionManager::dependenciesOrder() const
{
    QList<QPair<QString, QStringList> > unordered;
    QStringList ordered;

    // copy the map to a temporary list
    foreach (Project *pro, projects()) {
        const QString &proName = pro->document()->fileName();
        unordered << QPair<QString, QStringList>
            (proName, m_depMap.value(proName));
    }

    while (!unordered.isEmpty()) {
        for (int i=(unordered.count()-1); i>=0; --i) {
            if (unordered.at(i).second.isEmpty()) {
                ordered << unordered.at(i).first;
                unordered.removeAt(i);
            }
        }

        // remove the handled projects from the dependency lists
        // of the remaining unordered projects
        for (int i = 0; i < unordered.count(); ++i) {
            foreach (const QString &pro, ordered) {
                QStringList depList = unordered.at(i).second;
                depList.removeAll(pro);
                unordered[i].second = depList;
            }
        }
    }

    return ordered;
}

QList<Project *> SessionManager::projectOrder(Project *project) const
{
    QList<Project *> result;

    QStringList pros;
    if (project)
        pros = dependencies(project->document()->fileName());
    else
        pros = dependenciesOrder();

    foreach (const QString &proFile, pros) {
        foreach (Project *pro, projects()) {
            if (pro->document()->fileName() == proFile) {
                result << pro;
                break;
            }
        }
    }

    return result;
}

Project *SessionManager::projectForNode(Node *node) const
{
    if (!node)
        return 0;

    Project *project = 0;

    FolderNode *rootProjectNode = qobject_cast<FolderNode*>(node);
    if (!rootProjectNode)
        rootProjectNode = node->parentFolderNode();
    while (rootProjectNode && rootProjectNode->parentFolderNode() != m_sessionNode)
        rootProjectNode = rootProjectNode->parentFolderNode();

    Q_ASSERT(rootProjectNode);

    QList<Project *> projectList = projects();
    foreach (Project *p, projectList) {
        if (p->rootProjectNode() == rootProjectNode) {
            project = p;
            break;
        }
    }

    return project;
}

Node *SessionManager::nodeForFile(const QString &fileName, Project *project) const
{
    Node *node = 0;
    if (!project)
        project = projectForFile(fileName);
    if (project) {
        FindNodesForFileVisitor findNodes(fileName);
        project->rootProjectNode()->accept(&findNodes);

        foreach (Node *n, findNodes.nodes()) {
            // prefer file nodes
            if (!node || (node->nodeType() != FileNodeType && n->nodeType() == FileNodeType))
                node = n;
        }
    }

    return node;
}

Project *SessionManager::projectForFile(const QString &fileName) const
{
    if (debug)
        qDebug() << "SessionManager::projectForFile(" << fileName << ")";

    const QList<Project *> &projectList = projects();

    // Check current project first
    Project *currentProject = ProjectExplorerPlugin::currentProject();
    if (currentProject && projectContainsFile(currentProject, fileName))
        return currentProject;

    foreach (Project *p, projectList)
        if (p != currentProject && projectContainsFile(p, fileName))
            return p;
    return 0;
}

bool SessionManager::projectContainsFile(Project *p, const QString &fileName) const
{
    if (!m_projectFileCache.contains(p))
        m_projectFileCache.insert(p, p->files(Project::AllFiles));

    return m_projectFileCache.value(p).contains(fileName);
}

void SessionManager::configureEditor(Core::IEditor *editor, const QString &fileName)
{
    if (TextEditor::ITextEditor *textEditor = qobject_cast<TextEditor::ITextEditor*>(editor)) {
        Project *project = projectForFile(fileName);
        // Global settings are the default.
        if (project)
            project->editorConfiguration()->configureEditor(textEditor);
    }
}

void SessionManager::updateWindowTitle()
{
    if (isDefaultSession(m_sessionName)) {
        if (Project *currentProject = ProjectExplorerPlugin::currentProject())
            ICore::editorManager()->setWindowTitleAddition(currentProject->displayName());
        else
            ICore::editorManager()->setWindowTitleAddition(QString());
    } else {
        QString sessionName = m_sessionName;
        if (sessionName.isEmpty())
            sessionName = tr("Untitled");
        ICore::editorManager()->setWindowTitleAddition(sessionName);
    }
}

void SessionManager::removeProjects(QList<Project *> remove)
{
    QMap<QString, QStringList> resMap;

    foreach (Project *pro, remove) {
        if (debug)
            qDebug() << "SessionManager - emitting aboutToRemoveProject(" << pro->displayName() << ")";
        emit aboutToRemoveProject(pro);
    }


    // Refresh dependencies
    QSet<QString> projectFiles;
    foreach (Project *pro, projects()) {
        if (!remove.contains(pro))
            projectFiles.insert(pro->document()->fileName());
    }

    QSet<QString>::const_iterator i = projectFiles.begin();
    while (i != projectFiles.end()) {
        QStringList dependencies;
        foreach (const QString &dependency, m_depMap.value(*i)) {
            if (projectFiles.contains(dependency))
                dependencies << dependency;
        }
        if (!dependencies.isEmpty())
            resMap.insert(*i, dependencies);
        ++i;
    }

    m_depMap = resMap;

    // TODO: Clear m_modelProjectHash

    // Delete projects
    foreach (Project *pro, remove) {
        pro->saveSettings();
        m_projects.removeOne(pro);

        if (pro == m_startupProject)
            setStartupProject(0);

        disconnect(pro, SIGNAL(fileListChanged()),
                this, SLOT(clearProjectFileCache()));
        m_projectFileCache.remove(pro);

        if (debug)
            qDebug() << "SessionManager - emitting projectRemoved(" << pro->displayName() << ")";
        m_sessionNode->removeProjectNodes(QList<ProjectNode *>() << pro->rootProjectNode());
        emit projectRemoved(pro);
        delete pro;
    }

    if (startupProject() == 0)
        if (!m_projects.isEmpty())
            setStartupProject(m_projects.first());
}

/*!
    \brief Let other plugins store persistent values within the session file.
*/

void SessionManager::setValue(const QString &name, const QVariant &value)
{
    if (m_values.value(name) == value)
        return;
    m_values.insert(name, value);
    markSessionFileDirty(false);
}

QVariant SessionManager::value(const QString &name)
{
    QMap<QString, QVariant>::const_iterator it = m_values.find(name);
    return (it == m_values.constEnd()) ? QVariant() : *it;
}

QString SessionManager::activeSession() const
{
    return m_sessionName;
}

QStringList SessionManager::sessions() const
{
    if (m_sessions.isEmpty()) {
        // We are not initialized yet, so do that now
        QDir sessionDir(Core::ICore::userResourcePath());
        QList<QFileInfo> sessionFiles = sessionDir.entryInfoList(QStringList() << QLatin1String("*.qws"), QDir::NoFilter, QDir::Time);
        Q_FOREACH(const QFileInfo& fileInfo, sessionFiles) {
            if (fileInfo.completeBaseName() != QLatin1String("default"))
                m_sessions << fileInfo.completeBaseName();
        }
        m_sessions.prepend(QLatin1String("default"));
    }
    return m_sessions;
}

Utils::FileName SessionManager::sessionNameToFileName(const QString &session) const
{
    return Utils::FileName::fromString(ICore::userResourcePath() + QLatin1Char('/') + session + QLatin1String(".qws"));
}

/*!
    \brief Just creates a new session (Does not actually create the file).
*/

bool SessionManager::createSession(const QString &session)
{
    if (sessions().contains(session))
        return false;
    Q_ASSERT(m_sessions.size() > 0);
    m_sessions.insert(1, session);
    return true;
}

bool SessionManager::renameSession(const QString &original, const QString &newName)
{
    if (!cloneSession(original, newName))
        return false;
    if (original == activeSession())
        loadSession(newName);
    return deleteSession(original);
}

/*!
     \brief Deletes session name from session list and file from disk.
*/
bool SessionManager::deleteSession(const QString &session)
{
    if (!m_sessions.contains(session))
        return false;
    m_sessions.removeOne(session);
    QFile fi(sessionNameToFileName(session).toString());
    if (fi.exists())
        return fi.remove();
    return false;
}

bool SessionManager::cloneSession(const QString &original, const QString &clone)
{
    if (!m_sessions.contains(original))
        return false;

    QFile fi(sessionNameToFileName(original).toString());
    // If the file does not exist, we can still clone
    if (!fi.exists() || fi.copy(sessionNameToFileName(clone).toString())) {
        Q_ASSERT(m_sessions.size() > 0);
        m_sessions.insert(1, clone);
        return true;
    }
    return false;
}

void SessionManager::restoreValues(const Utils::PersistentSettingsReader &reader)
{
    const QStringList &keys = reader.restoreValue(QLatin1String("valueKeys")).toStringList();
    foreach (const QString &key, keys) {
        QVariant value = reader.restoreValue(QLatin1String("value-") + key);
        m_values.insert(key, value);
    }
}

void SessionManager::restoreDependencies(const Utils::PersistentSettingsReader &reader)
{
    QMap<QString, QVariant> depMap = reader.restoreValue(QLatin1String("ProjectDependencies")).toMap();
    QMap<QString, QVariant>::const_iterator i = depMap.constBegin();
    while (i != depMap.constEnd()) {
        const QString &key = i.key();
        if (!m_failedProjects.contains(key)) {
            QStringList values;
            foreach (const QString &value, i.value().toStringList()) {
                if (!m_failedProjects.contains(value))
                    values << value;
            }
            m_depMap.insert(key, values);
        }
        ++i;
    }
}

void SessionManager::askUserAboutFailedProjects()
{
    QStringList failedProjects = m_failedProjects;
    if (!failedProjects.isEmpty()) {
        QString fileList =
            QDir::toNativeSeparators(failedProjects.join(QLatin1String("<br>")));
        QMessageBox * box = new QMessageBox(QMessageBox::Warning,
                                            tr("Failed to restore project files"),
                                            tr("Could not restore the following project files:<br><b>%1</b>").
                                            arg(fileList));
        QPushButton * keepButton = new QPushButton(tr("Keep projects in Session"), box);
        QPushButton * removeButton = new QPushButton(tr("Remove projects from Session"), box);
        box->addButton(keepButton, QMessageBox::AcceptRole);
        box->addButton(removeButton, QMessageBox::DestructiveRole);

        box->exec();

        if (box->clickedButton() == removeButton)
            m_failedProjects.clear();
    }
}

void SessionManager::restoreStartupProject(const Utils::PersistentSettingsReader &reader)
{
    const QString startupProject = reader.restoreValue(QLatin1String("StartupProject")).toString();
    if (!startupProject.isEmpty()) {
        foreach (Project *pro, m_projects) {
            if (QDir::cleanPath(pro->document()->fileName()) == startupProject) {
                setStartupProject(pro);
                break;
            }
        }
    }
    if (!m_startupProject) {
        qWarning() << "Could not find startup project" << startupProject;
        if (!projects().isEmpty())
            setStartupProject(projects().first());
    }
}

void SessionManager::restoreEditors(const Utils::PersistentSettingsReader &reader)
{
    const QVariant &editorsettings = reader.restoreValue(QLatin1String("EditorSettings"));
    if (editorsettings.isValid()) {
        connect(ICore::editorManager(), SIGNAL(editorOpened(Core::IEditor*)),
                this, SLOT(sessionLoadingProgress()));
        ICore::editorManager()->restoreState(
            QByteArray::fromBase64(editorsettings.toByteArray()));
        disconnect(ICore::editorManager(), SIGNAL(editorOpened(Core::IEditor*)),
                   this, SLOT(sessionLoadingProgress()));
    }
}

/*!
     \brief Loads a session, takes a session name (not filename).
*/
void SessionManager::restoreProjects(const QStringList &fileList)
{
    // indirectly adds projects to session
    // Keep projects that failed to load in the session!
    m_failedProjects = fileList;
    if (!fileList.isEmpty()) {
        QString errors;
        QList<Project *> projects = ProjectExplorerPlugin::instance()->openProjects(fileList, &errors);
        if (!errors.isEmpty())
            QMessageBox::critical(Core::ICore::mainWindow(), tr("Failed to open project"), errors);
        foreach (Project *p, projects)
            m_failedProjects.removeAll(p->document()->fileName());
    }
}

bool SessionManager::loadSession(const QString &session)
{
    // Do nothing if we have that session already loaded,
    // exception if the session is the default virgin session
    // we still want to be able to load the default session
    if (session == m_sessionName && !isDefaultVirgin())
        return true;

    if (!sessions().contains(session))
        return false;

    // Try loading the file
    Utils::FileName fileName = sessionNameToFileName(session);
    PersistentSettingsReader reader;
    if (fileName.toFileInfo().exists()) {
        if (!reader.load(fileName)) {
            QMessageBox::warning(0, tr("Error while restoring session"),
                                 tr("Could not restore session %1").arg(fileName.toUserOutput()));
            return false;
        }
    }

    m_loadingSession = true;

    // Allow everyone to set something in the session and before saving
    emit aboutToUnloadSession(m_sessionName);

    if (!isDefaultVirgin()) {
        if (!save()) {
            m_loadingSession = false;
            return false;
        }
    }

    // Clean up
    if (!ICore::editorManager()->closeAllEditors()) {
        m_loadingSession = false;
        return false;
    }

    setStartupProject(0);
    removeProjects(projects());

    m_failedProjects.clear();
    m_depMap.clear();
    m_values.clear();

    m_sessionName = session;
    updateWindowTitle();

    if (fileName.toFileInfo().exists()) {
        m_virginSession = false;

        ICore::progressManager()->addTask(m_future.future(), tr("Session"),
           QLatin1String("ProjectExplorer.SessionFile.Load"));

        restoreValues(reader);
        emit aboutToLoadSession(session);

        QColor c = QColor(reader.restoreValue(QLatin1String("Color")).toString());
        if (c.isValid())
            Utils::StyleHelper::setBaseColor(c);

        QStringList fileList =
            reader.restoreValue(QLatin1String("ProjectList")).toStringList();
        int openEditorsCount = reader.restoreValue(QLatin1String("OpenEditors")).toInt();

        m_future.setProgressRange(0, fileList.count() + openEditorsCount + 2);
        m_future.setProgressValue(1);

        // if one processEvents doesn't get the job done
        // just use two!
        QCoreApplication::processEvents(QEventLoop::ExcludeUserInputEvents);
        QCoreApplication::processEvents(QEventLoop::ExcludeUserInputEvents);
        restoreProjects(fileList);
        sessionLoadingProgress();
        restoreDependencies(reader);
        restoreStartupProject(reader);
        restoreEditors(reader);

        m_future.reportFinished();
        m_future = QFutureInterface<void>();

        // restore the active mode
        Id modeId = Id::fromSetting(value(QLatin1String("ActiveMode")));
        if (!modeId.isValid())
            modeId = Id(Core::Constants::MODE_EDIT);

        ModeManager::activateMode(modeId);
        ModeManager::setFocusToCurrentMode();
    } else {
        ModeManager::activateMode(Id(Core::Constants::MODE_EDIT));
        ModeManager::setFocusToCurrentMode();
    }
    emit sessionLoaded(session);

    // Starts a event loop, better do that at the very end
    askUserAboutFailedProjects();
    m_loadingSession = false;
    return true;
}

QString SessionManager::lastSession() const
{
    return ICore::settings()->value(QLatin1String("ProjectExplorer/StartupSession")).toString();
}

SessionNode *SessionManager::sessionNode() const
{
    return m_sessionNode;
}

void SessionManager::reportProjectLoadingProgress()
{
    sessionLoadingProgress();
}

void SessionManager::markSessionFileDirty(bool makeDefaultVirginDirty)
{
    if (makeDefaultVirginDirty)
        m_virginSession = false;
}

void SessionManager::sessionLoadingProgress()
{
    m_future.setProgressValue(m_future.progressValue() + 1);
    QCoreApplication::processEvents(QEventLoop::ExcludeUserInputEvents);
}

void SessionManager::projectDisplayNameChanged()
{
    Project *pro = qobject_cast<Project*>(sender());
    if (pro) {
        Node *currentNode = 0;
        if (ProjectExplorerPlugin::currentProject() == pro)
            currentNode = ProjectExplorerPlugin::instance()->currentNode();

        // Fix node sorting
        QList<ProjectNode *> nodes;
        nodes << pro->rootProjectNode();
        m_sessionNode->removeProjectNodes(nodes);
        m_sessionNode->addProjectNodes(nodes);

        if (currentNode)
            ProjectExplorerPlugin::instance()->setCurrentNode(currentNode);

        emit projectDisplayNameChanged(pro);
    }
}

QStringList ProjectExplorer::SessionManager::projectsForSessionName(const QString &session) const
{
    const Utils::FileName fileName = sessionNameToFileName(session);
    PersistentSettingsReader reader;
    if (fileName.toFileInfo().exists()) {
        if (!reader.load(fileName)) {
            qWarning() << "Could not restore session" << fileName.toUserOutput();
            return QStringList();
        }
    }
    return reader.restoreValue(QLatin1String("ProjectList")).toStringList();
}