/*
 * Copyright (C) 2013 Google 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:
 *
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *     * 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.
 *     * Neither the name of Google Inc. nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND 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 THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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 */

#ifndef GridCoordinate_h
#define GridCoordinate_h

#include "wtf/HashMap.h"
#include "wtf/PassOwnPtr.h"
#include "wtf/text/WTFString.h"

namespace WebCore {

// A span in a single direction (either rows or columns). Note that |initialPositionIndex|
// and |finalPositionIndex| are grid areas' indexes, NOT grid lines'. Iterating over the
// span should include both |initialPositionIndex| and |finalPositionIndex| to be correct.
struct GridSpan {
    static PassOwnPtr<GridSpan> create(size_t initialPosition, size_t finalPosition)
    {
        return adoptPtr(new GridSpan(initialPosition, finalPosition));
    }

    GridSpan(size_t initialPosition, size_t finalPosition)
        : initialPositionIndex(initialPosition)
        , finalPositionIndex(finalPosition)
    {
        ASSERT(initialPositionIndex <= finalPositionIndex);
    }

    bool operator==(const GridSpan& o) const
    {
        return initialPositionIndex == o.initialPositionIndex && finalPositionIndex == o.finalPositionIndex;
    }

    size_t initialPositionIndex;
    size_t finalPositionIndex;
};

// This represents a grid area that spans in both rows' and columns' direction.
struct GridCoordinate {
    // HashMap requires a default constuctor.
    GridCoordinate()
        : columns(0, 0)
        , rows(0, 0)
    {
    }

    GridCoordinate(const GridSpan& r, const GridSpan& c)
        : columns(c)
        , rows(r)
    {
    }

    bool operator==(const GridCoordinate& o) const
    {
        return columns == o.columns && rows == o.rows;
    }

    bool operator!=(const GridCoordinate& o) const
    {
        return !(*this == o);
    }

    GridSpan columns;
    GridSpan rows;
};

typedef HashMap<String, GridCoordinate> NamedGridAreaMap;

} // namespace WebCore

#endif // GridCoordinate_h