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** Copyright (C) 2016 The Qt Company Ltd.
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** General Public License version 3 as published by the Free Software
** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
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#include "projectupdater.h"

#include "pchmanagerclient.h"

#include <filepathid.h>
#include <pchmanagerserverinterface.h>
#include <removepchprojectpartsmessage.h>
#include <updatepchprojectpartsmessage.h>

#include <cpptools/compileroptionsbuilder.h>
#include <cpptools/projectpart.h>

#include <algorithm>
#include <functional>

namespace ClangPchManager {

class HeaderAndSources
{
public:
    void reserve(std::size_t size)
    {
        headers.reserve(size);
        sources.reserve(size);
    }

    ClangBackEnd::FilePathIds headers;
    ClangBackEnd::FilePathIds sources;
};

ProjectUpdater::ProjectUpdater(ClangBackEnd::ProjectManagementServerInterface &server,
                               ClangBackEnd::FilePathCachingInterface &filePathCache)
    : m_server(server),
    m_filePathCache(filePathCache)
{
}

void ProjectUpdater::updateProjectParts(const std::vector<CppTools::ProjectPart *> &projectParts,
                                        ClangBackEnd::V2::FileContainers &&generatedFiles)
{
    m_excludedPaths = createExcludedPaths(generatedFiles);

    ClangBackEnd::UpdatePchProjectPartsMessage message{toProjectPartContainers(projectParts),
                                                       std::move(generatedFiles)};

    m_server.updatePchProjectParts(std::move(message));
}

void ProjectUpdater::removeProjectParts(const QStringList &projectPartIds)
{
    ClangBackEnd::RemovePchProjectPartsMessage message{Utils::SmallStringVector(projectPartIds)};

    m_server.removePchProjectParts(std::move(message));
}

void ProjectUpdater::setExcludedPaths(Utils::PathStringVector &&excludedPaths)
{
    m_excludedPaths = excludedPaths;
}

void ProjectUpdater::addToHeaderAndSources(HeaderAndSources &headerAndSources,
                                           const CppTools::ProjectFile &projectFile) const
{
    using ClangBackEnd::FilePathView;

    Utils::PathString path = projectFile.path;
    bool exclude = std::binary_search(m_excludedPaths.begin(), m_excludedPaths.end(), path);

    if (!exclude) {
        ClangBackEnd::FilePathId filePathId = m_filePathCache.filePathId(FilePathView(path));
        if (projectFile.isSource())
            headerAndSources.sources.push_back(filePathId);
        else if (projectFile.isHeader())
            headerAndSources.headers.push_back(filePathId);
    }
}

HeaderAndSources ProjectUpdater::headerAndSourcesFromProjectPart(
        CppTools::ProjectPart *projectPart) const
{
    HeaderAndSources headerAndSources;
    headerAndSources.reserve(std::size_t(projectPart->files.size()) * 3 / 2);

    for (const CppTools::ProjectFile &projectFile : projectPart->files)
        addToHeaderAndSources(headerAndSources, projectFile);

    return headerAndSources;
}

QStringList ProjectUpdater::compilerArguments(CppTools::ProjectPart *projectPart)
{
    using CppTools::CompilerOptionsBuilder;
    CompilerOptionsBuilder builder(*projectPart, CLANG_VERSION, CLANG_RESOURCE_DIR);
    return builder.build(CppTools::ProjectFile::CXXHeader, CompilerOptionsBuilder::PchUsage::None);
}

ClangBackEnd::V2::ProjectPartContainer ProjectUpdater::toProjectPartContainer(
        CppTools::ProjectPart *projectPart) const
{

    QStringList arguments = compilerArguments(projectPart);

    HeaderAndSources headerAndSources = headerAndSourcesFromProjectPart(projectPart);

    return ClangBackEnd::V2::ProjectPartContainer(projectPart->displayName,
                                                  Utils::SmallStringVector(arguments),
                                                  std::move(headerAndSources.headers),
                                                  std::move(headerAndSources.sources));
}

std::vector<ClangBackEnd::V2::ProjectPartContainer> ProjectUpdater::toProjectPartContainers(
        std::vector<CppTools::ProjectPart *> projectParts) const
{
    using namespace std::placeholders;

    std::vector<ClangBackEnd::V2::ProjectPartContainer> projectPartContainers;
    projectPartContainers.reserve(projectParts.size());

    std::transform(projectParts.begin(),
                   projectParts.end(),
                   std::back_inserter(projectPartContainers),
                   std::bind(&ProjectUpdater::toProjectPartContainer, this, _1));

    return projectPartContainers;
}

Utils::PathStringVector ProjectUpdater::createExcludedPaths(
        const ClangBackEnd::V2::FileContainers &generatedFiles)
{
    Utils::PathStringVector excludedPaths;
    excludedPaths.reserve(generatedFiles.size());

    auto convertToPath = [] (const ClangBackEnd::V2::FileContainer &fileContainer) {
        return fileContainer.filePath().path();
    };

    std::transform(generatedFiles.begin(),
                   generatedFiles.end(),
                   std::back_inserter(excludedPaths),
                   convertToPath);

    std::sort(excludedPaths.begin(), excludedPaths.end());

    return excludedPaths;
}

} // namespace ClangPchManager