/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */

/*

 * This file is part of the LibreOffice project.

 *

 * This Source Code Form is subject to the terms of the Mozilla Public

 * License, v. 2.0. If a copy of the MPL was not distributed with this

 * file, You can obtain one at http://mozilla.org/MPL/2.0/.

 *

 * This file incorporates work covered by the following license notice:

 *

 *   Licensed to the Apache Software Foundation (ASF) under one or more

 *   contributor license agreements. See the NOTICE file distributed

 *   with this work for additional information regarding copyright

 *   ownership. The ASF licenses this file to you under the Apache

 *   License, Version 2.0 (the "License"); you may not use this file

 *   except in compliance with the License. You may obtain a copy of

 *   the License at http://www.apache.org/licenses/LICENSE-2.0 .

 */

#pragma once

#include <sal/config.h>

#include <editeng/EPaM.hxx>

#include <cassert>

#include <utility>

struct ESelection

{

    // Select all text

    static constexpr ESelection All() { return { 0, 0, EE_PARA_MAX, EE_TEXTPOS_MAX }; }

    // Set to end without selection

    static constexpr ESelection AtEnd() { return { EE_PARA_MAX, EE_TEXTPOS_MAX }; }

    EPaM start;

    EPaM end;

    constexpr ESelection() = default;

    constexpr ESelection(sal_Int32 _nStartPara, sal_Int32 _nStartPos, sal_Int32 _nEndPara,

                         sal_Int32 _nEndPos)

        : start(_nStartPara, _nStartPos)

        , end(_nEndPara, _nEndPos)

    {

    }

    constexpr ESelection(sal_Int32 nPara, sal_Int32 nPos)

        : ESelection(nPara, nPos, nPara, nPos)

    {

    }

    constexpr explicit ESelection(const EPaM& rPos)

        : ESelection(rPos.nPara, rPos.nIndex)

    {

    }

    bool IsAdjusted() const { return !(end < start); }

    void Adjust()

    {

        if (!IsAdjusted())

            std::swap(start, end);

    }

    void CollapseToStart() { end = start; }

    void CollapseToEnd() { start = end; }

    bool operator==(const ESelection&) const = default;

    bool operator<(const ESelection& rSelection) const

    {

        // The selection must be adjusted.

        assert(IsAdjusted() && rSelection.IsAdjusted());

        // => Only check if end of 'this' < Start of rS

        return end < rSelection.start;

    }

    bool operator>(const ESelection& rSelection) const { return rSelection < *this; }

    bool HasRange() const { return start != end; }

};

template <typename charT, typename traits>

inline std::basic_ostream<charT, traits>& operator<<(std::basic_ostream<charT, traits>& stream,

                                                     ESelection const& rSelection)

{

    return stream << "ESelection(" << rSelection.start.nPara << ',' << rSelection.start.nIndex

                  << "," << rSelection.end.nPara << "," << rSelection.end.nIndex << ")";

}

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