/*
 * Copyright (C) 2025 Apple Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
 * THE POSSIBILITY OF SUCH DAMAGE.
 */

#pragma once

#include <WebCore/GridTypeAliases.h>
#include <wtf/Forward.h>
#include <wtf/Vector.h>

namespace WebCore {

namespace Layout {

enum class GridLayoutAlgorithm : uint8_t;
struct GridAutoFlowOptions;

// https://drafts.csswg.org/css-grid-1/#implicit-grids
class ImplicitGrid {
public:
    ImplicitGrid(size_t totalColumnsCount, size_t totalRowsCount);

    size_t rowsCount() const { return m_gridMatrix.size(); }
    size_t columnsCount() const { return rowsCount() ? m_gridMatrix[0].size() : 0; }

    void insertUnplacedGridItem(const UnplacedGridItem&);
    void insertDefiniteRowItem(const UnplacedGridItem&, GridAutoFlowOptions, HashMap<size_t, size_t, DefaultHash<size_t>, WTF::UnsignedWithZeroKeyHashTraits<size_t>>*);

    GridAreas gridAreas() const;

private:
    std::optional<size_t> findFirstAvailableColumnPosition(size_t rowStart, size_t rowEnd, size_t columnSpan, size_t startSearchColumn) const;
    bool isCellRangeEmpty(size_t columnStart, size_t columnEnd, size_t rowStart, size_t rowEnd) const;
    void insertItemInArea(const UnplacedGridItem&, size_t columnStart, size_t columnEnd, size_t rowStart, size_t rowEnd);

    GridMatrix m_gridMatrix;
};

} // namespace Layout

} // namespace WebCore
