/****************************************************************************
**
** Copyright (C) 2019 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of Qt Creator.
**
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3 as published by the Free Software
** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-3.0.html.
**
****************************************************************************/

#include "buildsystem.h"

#include "buildconfiguration.h"
#include "runconfiguration.h"
#include "runcontrol.h"
#include "target.h"

#include <utils/qtcassert.h>

#include <QTimer>

using namespace Utils;

namespace ProjectExplorer {

// --------------------------------------------------------------------
// BuildSystem:
// --------------------------------------------------------------------

class BuildSystemPrivate
{
public:
    Target *m_target = nullptr;
    BuildConfiguration *m_buildConfiguration = nullptr;

    QTimer m_delayedParsingTimer;

    bool m_isParsing = false;
    bool m_hasParsingData = false;

    DeploymentData m_deploymentData;
    QList<BuildTargetInfo> m_appTargets;
};

BuildSystem::BuildSystem(BuildConfiguration *bc)
    : BuildSystem(bc->target())
{
    d->m_buildConfiguration = bc;
}

BuildSystem::BuildSystem(Target *target)
    : d(new BuildSystemPrivate)
{
    QTC_CHECK(target);
    d->m_target = target;

    // Timer:
    d->m_delayedParsingTimer.setSingleShot(true);

    connect(&d->m_delayedParsingTimer, &QTimer::timeout, this, &BuildSystem::triggerParsing);
}

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

Project *BuildSystem::project() const
{
    return d->m_target->project();
}

Target *BuildSystem::target() const
{
    return d->m_target;
}

Kit *BuildSystem::kit() const
{
    return d->m_target->kit();
}

void BuildSystem::emitParsingStarted()
{
    QTC_ASSERT(!d->m_isParsing, return);

    d->m_isParsing = true;
    d->m_hasParsingData = false;
    emit parsingStarted();
    emit d->m_target->parsingStarted();
}

void BuildSystem::emitParsingFinished(bool success)
{
    // Intentionally no return, as we currently get start - start - end - end
    // sequences when switching qmake targets quickly.
    QTC_CHECK(d->m_isParsing);

    d->m_isParsing = false;
    d->m_hasParsingData = success;
    emit parsingFinished(success);
    emit d->m_target->parsingFinished(success);
}

FilePath BuildSystem::projectFilePath() const
{
    return d->m_target->project()->projectFilePath();
}

FilePath BuildSystem::projectDirectory() const
{
    return d->m_target->project()->projectDirectory();
}

bool BuildSystem::isWaitingForParse() const
{
    return d->m_delayedParsingTimer.isActive();
}

void BuildSystem::requestParse()
{
    requestParseHelper(0);
}

void BuildSystem::requestDelayedParse()
{
    requestParseHelper(1000);
}

bool BuildSystem::isParsing() const
{
    return d->m_isParsing;
}

bool BuildSystem::hasParsingData() const
{
    return d->m_hasParsingData;
}

Environment BuildSystem::activeParseEnvironment() const
{
    const BuildConfiguration *const bc = d->m_target->activeBuildConfiguration();
    if (bc)
        return bc->environment();

    const RunConfiguration *const rc = d->m_target->activeRunConfiguration();
    if (rc)
        return rc->runnable().environment;

    Environment result = Utils::Environment::systemEnvironment();
    d->m_target->kit()->addToEnvironment(result);

    return result;
}

void BuildSystem::requestParseHelper(int delay)
{
    d->m_delayedParsingTimer.setInterval(delay);
    d->m_delayedParsingTimer.start();
}

bool BuildSystem::addFiles(Node *, const QStringList &filePaths, QStringList *notAdded)
{
    Q_UNUSED(filePaths)
    Q_UNUSED(notAdded)
    return false;
}

RemovedFilesFromProject BuildSystem::removeFiles(Node *, const QStringList &filePaths,
                                                 QStringList *notRemoved)
{
    Q_UNUSED(filePaths)
    Q_UNUSED(notRemoved)
    return RemovedFilesFromProject::Error;
}

bool BuildSystem::deleteFiles(Node *, const QStringList &filePaths)
{
    Q_UNUSED(filePaths)
    return false;
}

bool BuildSystem::canRenameFile(Node *, const QString &filePath, const QString &newFilePath)
{
    Q_UNUSED(filePath)
    Q_UNUSED(newFilePath)
    return true;
}

bool BuildSystem::renameFile(Node *, const QString &filePath, const QString &newFilePath)
{
    Q_UNUSED(filePath)
    Q_UNUSED(newFilePath)
    return false;
}

bool BuildSystem::addDependencies(Node *, const QStringList &dependencies)
{
    Q_UNUSED(dependencies)
    return false;
}

bool BuildSystem::supportsAction(Node *, ProjectAction, const Node *) const
{
    return false;
}

QStringList BuildSystem::filesGeneratedFrom(const QString &sourceFile) const
{
    Q_UNUSED(sourceFile)
    return {};
}

QVariant BuildSystem::additionalData(Core::Id id) const
{
    Q_UNUSED(id)
    return {};
}

// ParseGuard

BuildSystem::ParseGuard::ParseGuard(BuildSystem::ParseGuard &&other)
    : m_buildSystem{std::move(other.m_buildSystem)}
    , m_success{std::move(other.m_success)}
{
    // No need to release this as this is invalid anyway:-)
    other.m_buildSystem = nullptr;
}

BuildSystem::ParseGuard::ParseGuard(BuildSystem *p)
    : m_buildSystem(p)
{
    if (m_buildSystem && !m_buildSystem->isParsing())
        m_buildSystem->emitParsingStarted();
    else
        m_buildSystem = nullptr;
}

void BuildSystem::ParseGuard::release()
{
    if (m_buildSystem)
        m_buildSystem->emitParsingFinished(m_success);
    m_buildSystem = nullptr;
}

BuildSystem::ParseGuard &BuildSystem::ParseGuard::operator=(BuildSystem::ParseGuard &&other)
{
    release();

    m_buildSystem = std::move(other.m_buildSystem);
    m_success = std::move(other.m_success);

    other.m_buildSystem = nullptr;
    return *this;
}

void BuildSystem::setDeploymentData(const DeploymentData &deploymentData)
{
    if (d->m_deploymentData != deploymentData) {
        d->m_deploymentData = deploymentData;
        emit deploymentDataChanged();
        emit applicationTargetsChanged();
        emit target()->deploymentDataChanged();
    }
}

DeploymentData BuildSystem::deploymentData() const
{
    return d->m_deploymentData;
}

void BuildSystem::setApplicationTargets(const QList<BuildTargetInfo> &appTargets)
{
    if (Utils::toSet(appTargets) != Utils::toSet(d->m_appTargets)) {
        d->m_appTargets = appTargets;
        emit applicationTargetsChanged();
    }
}

const QList<BuildTargetInfo> BuildSystem::applicationTargets() const
{
    return d->m_appTargets;
}

BuildTargetInfo BuildSystem::buildTarget(const QString &buildKey) const
{
    return Utils::findOrDefault(d->m_appTargets, [&buildKey](const BuildTargetInfo &ti) {
        return ti.buildKey == buildKey;
    });
}

void BuildSystem::setRootProjectNode(std::unique_ptr<ProjectNode> &&root)
{
    d->m_target->project()->setRootProjectNode(std::move(root));
}

void BuildSystem::emitBuildSystemUpdated()
{
    target()->buildSystemUpdated(this);
}

QString BuildSystem::disabledReason(const QString &buildKey) const
{
    if (!hasParsingData()) {
        QString msg = isParsing() ? tr("The project is currently being parsed.")
                                  : tr("The project could not be fully parsed.");
        const FilePath projectFilePath = buildTarget(buildKey).projectFilePath;
        if (!projectFilePath.isEmpty() && !projectFilePath.exists())
            msg += '\n' + tr("The project file \"%1\" does not exist.").arg(projectFilePath.toString());
        return msg;
    }
    return {};
}

} // namespace ProjectExplorer
