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** Copyright (C) 2018 The Qt Company Ltd.
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** GNU General Public License Usage
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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
** included in the packaging of this file. Please review the following
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#pragma once

#include "sourcelocationsutils.h"

#include <filepathcachinginterface.h>

#include <utils/linecolumn.h>
#include <utils/optional.h>

#include <clang/Basic/SourceLocation.h>
#include <clang/Basic/SourceManager.h>
#include <clang/Index/USRGeneration.h>
#include <llvm/ADT/SmallVector.h>

namespace ClangBackEnd {

class SymbolsVisitorBase
{
public:
    SymbolsVisitorBase(FilePathCachingInterface &filePathCache,
                       const clang::SourceManager &sourceManager)
        : m_filePathCache(filePathCache),
          m_sourceManager(sourceManager)
    {}

    FilePathId filePathId(clang::SourceLocation sourceLocation)
    {
        clang::FileID clangFileId = m_sourceManager.getFileID(sourceLocation);
        const clang::FileEntry *fileEntry = m_sourceManager.getFileEntryForID(clangFileId);

        return filePathId(fileEntry);
    }

    FilePathId filePathId(const clang::FileEntry *fileEntry)
    {
        if (fileEntry) {
            uint fileHash = fileEntry->getUID();

            auto found = m_filePathIndices.find(fileHash);

            if (found != m_filePathIndices.end())
                return found->second;

            auto filePath = fileEntry->getName();
            FilePathId filePathId = m_filePathCache.filePathId(FilePath::fromNativeFilePath(absolutePath(filePath)));

            m_filePathIndices.emplace(fileHash, filePathId);

            return filePathId;
        }

        return {};
    }

    Utils::LineColumn lineColum(clang::SourceLocation sourceLocation)
    {
        return {int(m_sourceManager.getSpellingLineNumber(sourceLocation)),
                int(m_sourceManager.getSpellingColumnNumber(sourceLocation))};
    }

    static Utils::optional<Utils::PathString> generateUSR(const clang::Decl *declaration)
    {
        llvm::SmallVector<char, 128> usr;

        Utils::optional<Utils::PathString> usrOptional;

        bool wasNotWorking = clang::index::generateUSRForDecl(declaration, usr);

        if (!wasNotWorking)
            usrOptional.emplace(usr.data(), usr.size());

        return usrOptional;
    }

    Utils::optional<Utils::PathString> generateUSR(clang::StringRef macroName,
                                                   clang::SourceLocation sourceLocation)
    {
        llvm::SmallVector<char, 128> usr;

        Utils::optional<Utils::PathString> usrOptional;

        bool wasNotWorking = clang::index::generateUSRForMacro(macroName,
                                                               sourceLocation,
                                                               m_sourceManager,
                                                               usr);

        if (!wasNotWorking)
            usrOptional.emplace(usr.data(), usr.size());

        return usrOptional;
    }

    static SymbolIndex toSymbolIndex(const void *pointer)
    {
        return SymbolIndex(reinterpret_cast<std::uintptr_t>(pointer));
    }

protected:
    std::unordered_map<uint, FilePathId> m_filePathIndices;
    FilePathCachingInterface &m_filePathCache;
    const clang::SourceManager &m_sourceManager;
};

} // namespace ClangBackend