/****************************************************************************
**
** Copyright (C) 2017 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 "cppprojectinfogenerator.h"

#include "cppprojectfilecategorizer.h"

#include <projectexplorer/headerpath.h>
#include <projectexplorer/projectexplorerconstants.h>
#include <projectexplorer/taskhub.h>

#include <utils/qtcassert.h>

#include <QTimer>

#include <set>

using namespace ProjectExplorer;

namespace CppTools {
namespace Internal {

ProjectInfoGenerator::ProjectInfoGenerator(const QFutureInterface<ProjectInfo> &futureInterface,
                                           const ProjectUpdateInfo &projectUpdateInfo)
    : m_futureInterface(futureInterface)
    , m_projectUpdateInfo(projectUpdateInfo)
{
}

ProjectInfo ProjectInfoGenerator::generate()
{
    ProjectInfo projectInfo(m_projectUpdateInfo.project);

    for (const RawProjectPart &rpp : m_projectUpdateInfo.rawProjectParts) {
        if (m_futureInterface.isCanceled())
            return ProjectInfo();

        for (const ProjectPart::Ptr &part : createProjectParts(rpp))
            projectInfo.appendProjectPart(part);
    }

    static const auto showWarning = [](const QString &message) {
        QTimer::singleShot(0, TaskHub::instance(), [message] {
            TaskHub::addTask(BuildSystemTask(Task::Warning, message));
        });
    };
    if (m_cToolchainMissing) {
        showWarning(QCoreApplication::translate("CppTools",
                "The project contains C source files, but the currently active kit "
                "has no C compiler. The code model will not be fully functional."));
    }
    if (m_cxxToolchainMissing) {
        showWarning(QCoreApplication::translate("CppTools",
                "The project contains C++ source files, but the currently active kit "
                "has no C++ compiler. The code model will not be fully functional."));
    }
    return projectInfo;
}

static ProjectPart::Ptr projectPartFromRawProjectPart(
    const RawProjectPart &rawProjectPart, Project *project)
{
    ProjectPart::Ptr part(new ProjectPart);
    part->project = project;
    part->projectFile = rawProjectPart.projectFile;
    part->projectConfigFile = rawProjectPart.projectConfigFile;
    part->projectFileLine = rawProjectPart.projectFileLine;
    part->projectFileColumn = rawProjectPart.projectFileColumn;
    part->callGroupId = rawProjectPart.callGroupId;
    part->buildSystemTarget = rawProjectPart.buildSystemTarget;
    part->buildTargetType = rawProjectPart.buildTargetType;
    part->qtVersion = rawProjectPart.qtVersion;
    part->projectMacros = rawProjectPart.projectMacros;
    if (!part->projectConfigFile.isEmpty())
        part->projectMacros += Macro::toMacros(ProjectPart::readProjectConfigFile(part));

    // Prevent duplicate include paths.
    std::set<QString> seenPaths;
    for (const HeaderPath &p : qAsConst(rawProjectPart.headerPaths)) {
        const QString cleanPath = QDir::cleanPath(p.path);
        if (seenPaths.insert(cleanPath).second)
            part->headerPaths << HeaderPath(cleanPath, p.type);
    }

    part->precompiledHeaders = rawProjectPart.precompiledHeaders;
    part->includedFiles = rawProjectPart.includedFiles;
    part->selectedForBuilding = rawProjectPart.selectedForBuilding;

    return part;
}

const QVector<ProjectPart::Ptr> ProjectInfoGenerator::createProjectParts(
    const RawProjectPart &rawProjectPart)
{
    using Utils::LanguageExtension;

    QVector<ProjectPart::Ptr> result;
    ProjectFileCategorizer cat(rawProjectPart.displayName,
                               rawProjectPart.files,
                               rawProjectPart.fileIsActive);

    if (!cat.hasParts())
        return result;

    const ProjectPart::Ptr part = projectPartFromRawProjectPart(rawProjectPart,
                                                                m_projectUpdateInfo.project);

    if (m_projectUpdateInfo.cxxToolChain) {
        if (cat.hasCxxSources()) {
            result << createProjectPart(rawProjectPart,
                                        part,
                                        cat.cxxSources(),
                                        cat.partName("C++"),
                                        Language::Cxx,
                                        LanguageExtension::None);
        }
        if (cat.hasObjcxxSources()) {
            result << createProjectPart(rawProjectPart,
                                        part,
                                        cat.objcxxSources(),
                                        cat.partName("Obj-C++"),
                                        Language::Cxx,
                                        LanguageExtension::ObjectiveC);
        }
    } else if (cat.hasCxxSources() || cat.hasObjcxxSources()) {
        m_cxxToolchainMissing = true;
    }

    if (m_projectUpdateInfo.cToolChain) {
        if (cat.hasCSources()) {
            result << createProjectPart(rawProjectPart,
                                        part,
                                        cat.cSources(),
                                        cat.partName("C"),
                                        Language::C,
                                        LanguageExtension::None);
        }

        if (cat.hasObjcSources()) {
            result << createProjectPart(rawProjectPart,
                                        part,
                                        cat.objcSources(),
                                        cat.partName("Obj-C"),
                                        Language::C,
                                        LanguageExtension::ObjectiveC);
        }
    } else if (cat.hasCSources() || cat.hasObjcSources()) {
        m_cToolchainMissing = true;
    }

    return result;
}

ProjectPart::Ptr ProjectInfoGenerator::createProjectPart(
    const RawProjectPart &rawProjectPart,
    const ProjectPart::Ptr &templateProjectPart,
    const ProjectFiles &projectFiles,
    const QString &partName,
    Language language,
    Utils::LanguageExtensions languageExtensions)
{
    RawProjectPartFlags flags;
    ToolChainInfo tcInfo;
    if (language == Language::C) {
        flags = rawProjectPart.flagsForC;
        tcInfo = m_projectUpdateInfo.cToolChainInfo;
    }
    // Use Cxx toolchain for C projects without C compiler in kit and for C++ code
    if (!tcInfo.isValid()) {
        flags = rawProjectPart.flagsForCxx;
        tcInfo = m_projectUpdateInfo.cxxToolChainInfo;
    }

    ProjectPart::Ptr part(templateProjectPart->copy());
    part->displayName = partName;
    part->files = projectFiles;
    part->warningFlags = flags.warningFlags;
    part->language = language;
    part->languageExtensions = flags.languageExtensions | languageExtensions;
    part->setupToolchainProperties(tcInfo, flags.commandLineFlags);
    part->updateLanguageFeatures();

    return part;
}

} // namespace Internal
} // namespace CppTools
