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/* ============================================================
 *
 * This file is a part of digiKam project
 * https://www.digikam.org
 *
 * Date        : 2023-05-15
 * Description : geolocation engine based on Marble.
 *               (c) 2007-2022 Marble Team
 *               https://invent.kde.org/education/marble/-/raw/master/data/credits_authors.html
 *
 * SPDX-FileCopyrightText: 2023-2026 by Gilles Caulier <caulier dot gilles at gmail dot com>
 *
 * SPDX-License-Identifier: LGPL-2.1-or-later
 *
 * ============================================================ */

#include "TileCoordsPyramid.h"

// C++ includes

#include <algorithm>

// Qt includes

#include <QRect>
#include <QVector>

// Local includes

#include "digikam_debug.h"

namespace Marble
{

class Q_DECL_HIDDEN TileCoordsPyramid::Private
{
public:

    Private(int const topLevel, int const bottomLevel);

    int             m_topLevel;
    int             m_bottomLevel;
    QRect           m_bottomLevelCoords;
    QVector<int>    m_validLevels;
};

TileCoordsPyramid::Private::Private(int const topLevel, int const bottomLevel)
    : m_topLevel(topLevel),
      m_bottomLevel(bottomLevel)
{
    Q_ASSERT(m_topLevel <= m_bottomLevel);
}

TileCoordsPyramid::TileCoordsPyramid(int const topLevel, int const bottomLevel)
    : d(new Private(topLevel, bottomLevel))
{
}

TileCoordsPyramid::TileCoordsPyramid(TileCoordsPyramid const& other)
    : d(new Private(*other.d))
{
}

TileCoordsPyramid::TileCoordsPyramid()
    : d(new Private(0, 0))
{
}

TileCoordsPyramid& TileCoordsPyramid::operator=(TileCoordsPyramid const& rhs)
{
    TileCoordsPyramid temp(rhs);
    swap(temp);
    return *this;
}

TileCoordsPyramid::~TileCoordsPyramid()
{
    delete d;
}

int TileCoordsPyramid::topLevel() const
{
    return d->m_topLevel;
}

int TileCoordsPyramid::bottomLevel() const
{
    return d->m_bottomLevel;
}

void TileCoordsPyramid::setBottomLevelCoords(QRect const& coords)<--- Shadow argument
{
    d->m_bottomLevelCoords = coords;
}

QRect TileCoordsPyramid::coords(int const level) const
{
    Q_ASSERT(d->m_topLevel <= level && level <= d->m_bottomLevel);
    int bottomX1, bottomY1, bottomX2, bottomY2;
    d->m_bottomLevelCoords.getCoords(&bottomX1, &bottomY1, &bottomX2, &bottomY2);
    int const deltaLevel = d->m_bottomLevel - level;
    int const x1 = bottomX1 >> deltaLevel;
    int const y1 = bottomY1 >> deltaLevel;
    int const x2 = bottomX2 >> deltaLevel;
    int const y2 = bottomY2 >> deltaLevel;
    QRect result;
    result.setCoords(x1, y1, x2, y2);
    return result;
}

void TileCoordsPyramid::setValidTileLevels(const QVector<int>& validLevels)
{
    d->m_validLevels = validLevels;
}

QVector<int> TileCoordsPyramid::validTileLevels()
{
    return d->m_validLevels;
}

qint64 TileCoordsPyramid::tilesCount() const
{
    qint64 result = 0;

    for (int level = d->m_topLevel; level <= d->m_bottomLevel; ++level)
    {
        if (!d->m_validLevels.isEmpty() && !d->m_validLevels.contains(level))
        {
            continue;
        }

        QRect const levelCoords = coords(level);
        // w*h can exceed 32 bit range, so force 64 bit calculation; see bug 342397
        result += qint64(levelCoords.width()) * levelCoords.height();
    }

    return result;
}

void TileCoordsPyramid::swap(TileCoordsPyramid& other)
{
    std::swap(d, other.d);
}

} // namespace Marble