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**
** Copyright (C) 2016 The Qt Company Ltd.
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**
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** accordance with the commercial license agreement provided with the
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** 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
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#pragma once

#include "clangsupport_global.h"

#include "filepathview.h"
#include "filepathview.h"

#include <utils/hostosinfo.h>
#include <utils/smallstringio.h>

#include <QDataStream>

namespace ClangBackEnd {

class FilePath
{
    using size_type = Utils::PathString::size_type;

public:
    FilePath() = default;
    explicit FilePath(Utils::PathString &&filePath)
        : m_path(std::move(filePath))
    {
        FilePathView view{m_path};

        m_slashIndex = view.slashIndex();
    }

    FilePath(FilePathView filePathView)
        : m_path(filePathView.toStringView()),
          m_slashIndex(filePathView.slashIndex())
    {
    }

    template<size_type Size>
    FilePath(const char(&string)[Size]) noexcept
        : FilePath(FilePathView(string, Size - 1))
    {
        static_assert(Size >= 1, "Invalid string literal! Length is zero!");
    }

    explicit FilePath(const Utils::PathString &filePath)
        : FilePath(filePath.clone())
    {
    }

    explicit FilePath(Utils::PathString &&filePath, std::ptrdiff_t slashIndex)
        : m_path(std::move(filePath)),
          m_slashIndex(slashIndex)
    {
    }

    explicit FilePath(const QString &filePath)
        : FilePath(Utils::PathString(filePath))
    {
    }

    FilePath(Utils::SmallStringView directory, Utils::SmallStringView name)
        : m_path({directory, "/", name}),
          m_slashIndex(std::ptrdiff_t(directory.size()))
    {}

    Utils::SmallStringView directory() const noexcept
    {
        return m_path.mid(0, std::size_t(std::max(std::ptrdiff_t(0), m_slashIndex)));
    }

    Utils::SmallStringView name() const noexcept
    {
        return m_path.mid(std::size_t(m_slashIndex + 1),
                          std::size_t(std::ptrdiff_t(m_path.size()) - m_slashIndex - std::ptrdiff_t(1)));
    }

    bool empty() const
    {
        return m_path.empty();
    }

    const Utils::PathString &path()  const noexcept
    {
        return m_path;
    }

    operator const Utils::PathString&() const noexcept
    {
        return m_path;
    }

    operator FilePathView() const noexcept
    {
        return FilePathView(Utils::SmallStringView(m_path));
    }

    friend QDataStream &operator<<(QDataStream &out, const FilePath &filePath)
    {
        out << filePath.m_path;
        out << uint(filePath.m_slashIndex);

        return out;
    }

    friend QDataStream &operator>>(QDataStream &in, FilePath &filePath)
    {
        uint slashIndex;

        in >> filePath.m_path;
        in >> slashIndex;

        filePath.m_slashIndex = slashIndex;

        return in;
    }

    friend bool operator==(const FilePath &first, const FilePath &second)
    {
        return first.m_path == second.m_path;
    }

    friend bool operator==(const FilePath &first, const FilePathView &second)
    {
        return first.path() == second.toStringView();
    }

    friend bool operator==(const FilePathView &first, const FilePath &second)
    {
        return second == first;
    }

    friend bool operator<(const FilePath &first, const FilePath &second)
    {
        return first.m_path < second.m_path;
    }

    FilePath clone() const
    {
        return *this;
    }

    std::ptrdiff_t slashIndex() const
    {
        return m_slashIndex;
    }

    template<typename String>
    static FilePath fromNativeFilePath(String filePath)
    {
        Utils::PathString nativePath{filePath.data(), filePath.size()};

        if (Utils::HostOsInfo::isWindowsHost())
            nativePath.replace('\\', '/');

        return FilePath(std::move(nativePath));
    }

private:
    Utils::PathString m_path;
    std::ptrdiff_t m_slashIndex = -1;
};

using FilePaths = std::vector<FilePath>;

CLANGSUPPORT_EXPORT QDebug operator<<(QDebug debug, const FilePath &filePath);

} // namespace ClangBackEnd