/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of Qbs.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 3 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL3 included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or (at your option) the GNU General
** Public license version 3 or any later version approved by the KDE Free
** Qt Foundation. The licenses are as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-2.0.html and
** https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/

#include "loader.h"

#include "evaluator.h"
#include "language.h"
#include "moduleloader.h"
#include "projectresolver.h"
#include "scriptengine.h"

#include <logging/translator.h>
#include <tools/fileinfo.h>
#include <tools/profile.h>
#include <tools/progressobserver.h>
#include <tools/qbsassert.h>
#include <tools/settings.h>
#include <tools/setupprojectparameters.h>
#include <tools/stringconstants.h>

#include <QtCore/qdir.h>
#include <QtCore/qobject.h>
#include <QtCore/qtimer.h>

namespace qbs {
namespace Internal {

Loader::Loader(ScriptEngine *engine, Logger logger)
    : m_logger(std::move(logger))
    , m_progressObserver(nullptr)
    , m_engine(engine)
{
    m_logger.storeWarnings();
}

void Loader::setProgressObserver(ProgressObserver *observer)
{
    m_progressObserver = observer;
}

void Loader::setSearchPaths(const QStringList &_searchPaths)
{
    QStringList searchPaths;
    for (const QString &searchPath : _searchPaths) {
        if (!FileInfo::exists(searchPath)) {
            m_logger.qbsWarning() << Tr::tr("Search path '%1' does not exist.")
                    .arg(QDir::toNativeSeparators(searchPath));
        } else {
            searchPaths += searchPath;
        }
    }

    m_searchPaths = searchPaths;
}

void Loader::setOldProjectProbes(const std::vector<ProbeConstPtr> &oldProbes)
{
    m_oldProjectProbes = oldProbes;
}

void Loader::setOldProductProbes(const QHash<QString, std::vector<ProbeConstPtr>> &oldProbes)
{
    m_oldProductProbes = oldProbes;
}

void Loader::setStoredProfiles(const QVariantMap &profiles)
{
    m_storedProfiles = profiles;
}

void Loader::setStoredModuleProviderInfo(const StoredModuleProviderInfo &providerInfo)
{
    m_storedModuleProviderInfo = providerInfo;
}

TopLevelProjectPtr Loader::loadProject(const SetupProjectParameters &_parameters)
{
    SetupProjectParameters parameters = _parameters;

    if (parameters.topLevelProfile().isEmpty()) {
        Settings settings(parameters.settingsDirectory());
        QString profileName = settings.defaultProfile();
        if (profileName.isEmpty()) {
            m_logger.qbsDebug() << Tr::tr("No profile specified and no default profile exists. "
                                          "Using default property values.");
            profileName = Profile::fallbackName();
        }
        parameters.setTopLevelProfile(profileName);
        parameters.expandBuildConfiguration();
    }

    setupProjectFilePath(parameters);
    QBS_CHECK(QFileInfo(parameters.projectFilePath()).isAbsolute());
    m_logger.qbsDebug() << "Using project file '"
                        << QDir::toNativeSeparators(parameters.projectFilePath()) << "'.";

    m_engine->setEnvironment(parameters.adjustedEnvironment());
    m_engine->clearExceptions();
    m_engine->clearImportsCache();
    m_engine->clearRequestedProperties();
    m_engine->enableProfiling(parameters.logElapsedTime());
    m_logger.clearWarnings();
    EvalContextSwitcher evalContextSwitcher(m_engine, EvalContext::PropertyEvaluation);

    QTimer cancelationTimer;

    // At this point, we cannot set a sensible total effort, because we know nothing about
    // the project yet. That's why we use a placeholder here, so the user at least
    // sees that an operation is starting. The real total effort will be set later when
    // we have enough information.
    if (m_progressObserver) {
        m_progressObserver->initialize(Tr::tr("Resolving project for configuration %1")
                .arg(TopLevelProject::deriveId(parameters.finalBuildConfigurationTree())), 1);
        cancelationTimer.setSingleShot(false);
        QObject::connect(&cancelationTimer, &QTimer::timeout, [this]() {
            QBS_ASSERT(m_progressObserver, return);
            if (m_progressObserver->canceled())
                m_engine->cancel();
        });
        cancelationTimer.start(1000);
    }

    const FileTime resolveTime = FileTime::currentTime();
    Evaluator evaluator(m_engine);
    ModuleLoader moduleLoader(&evaluator, m_logger);
    moduleLoader.setProgressObserver(m_progressObserver);
    moduleLoader.setSearchPaths(m_searchPaths);
    moduleLoader.setOldProjectProbes(m_oldProjectProbes);
    moduleLoader.setOldProductProbes(m_oldProductProbes);
    moduleLoader.setLastResolveTime(m_lastResolveTime);
    moduleLoader.setStoredProfiles(m_storedProfiles);
    moduleLoader.setStoredModuleProviderInfo(m_storedModuleProviderInfo);
    const ModuleLoaderResult loadResult = moduleLoader.load(parameters);
    ProjectResolver resolver(&evaluator, loadResult, std::move(parameters), m_logger);
    resolver.setProgressObserver(m_progressObserver);
    TopLevelProjectPtr project = resolver.resolve();
    project->lastStartResolveTime = resolveTime;
    project->lastEndResolveTime = FileTime::currentTime();

    // E.g. if the top-level project is disabled.
    if (m_progressObserver)
        m_progressObserver->setFinished();

    return project;
}

void Loader::setupProjectFilePath(SetupProjectParameters &parameters)
{
    QString projectFilePath = parameters.projectFilePath();
    if (projectFilePath.isEmpty())
        projectFilePath = QDir::currentPath();
    const QFileInfo projectFileInfo(projectFilePath);
    if (!projectFileInfo.exists())
        throw ErrorInfo(Tr::tr("Project file '%1' cannot be found.").arg(projectFilePath));
    if (projectFileInfo.isRelative())
        projectFilePath = projectFileInfo.absoluteFilePath();
    if (projectFileInfo.isFile()) {
        parameters.setProjectFilePath(projectFilePath);
        return;
    }
    if (!projectFileInfo.isDir())
        throw ErrorInfo(Tr::tr("Project file '%1' has invalid type.").arg(projectFilePath));

    const QStringList &actualFileNames
            = QDir(projectFilePath).entryList(StringConstants::qbsFileWildcards(), QDir::Files);
    if (actualFileNames.empty()) {
        QString error;
        if (parameters.projectFilePath().isEmpty())
            error = Tr::tr("No project file given and none found in current directory.\n");
        else
            error = Tr::tr("No project file found in directory '%1'.").arg(projectFilePath);
        throw ErrorInfo(error);
    }
    if (actualFileNames.size() > 1) {
        throw ErrorInfo(Tr::tr("More than one project file found in directory '%1'.")
                .arg(projectFilePath));
    }
    projectFilePath.append(QLatin1Char('/')).append(actualFileNames.front());

    projectFilePath = QDir::current().filePath(projectFilePath);
    projectFilePath = QDir::cleanPath(projectFilePath);
    parameters.setProjectFilePath(projectFilePath);
}

} // namespace Internal
} // namespace qbs
