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#include <qnumeric.h>
#include "qdeclarativegeoboundingcircle_p.h"

QT_BEGIN_NAMESPACE

/*!
    \qmlclass BoundingCircle QDeclarativeGeoBoundingCircle
    \inqmlmodule QtLocation 5
    \ingroup qml-QtLocation5-positioning
    \since Qt Location 5.0

    \brief The BoundingCircle element represents a circular geographic area.

    The circle is defined in terms of a \l{QDeclarativeCoordinate}{Coordinate}
    which specifies the center of the circle and a qreal which specifies the
    radius of the circle in meters.

    The circle is considered invalid if the center coordinate is invalid
    or if the radius is less than zero.

    \section2 Example Usage

    The following code snippet shows the declaration of a BoundingCircle element.

    \code
    BoundingCircle {
        radius: 25.0
        center: Coordinate {
            latitude: 23.34
            longitude: 44.4
        }
    }
    \endcode

    This could then be used, for example, as a region to scan for landmarks,
    or refining searches.

    \sa QGeoBoundingCircle
*/

QDeclarativeGeoBoundingCircle::QDeclarativeGeoBoundingCircle(QObject *parent)
:   QDeclarativeGeoBoundingArea(parent), m_center(0), m_radius(-1.0)
{
}

QDeclarativeGeoBoundingCircle::QDeclarativeGeoBoundingCircle(const QGeoBoundingCircle &circle,
                                                             QObject *parent)
:   QDeclarativeGeoBoundingArea(parent), m_center(0), m_circle(circle), m_radius(qQNaN())
{
    synchronizeDeclarative(circle, false);
}

/*!
    \qmlproperty QGeoBoundingCircle BoundingCircle::circle

    For details on how to use this property to interface between C++ and QML see
    "\l {location-cpp-qml.html#boundingcircle} {Interfaces between C++ and QML Code}".
*/
void QDeclarativeGeoBoundingCircle::setCircle(const QGeoBoundingCircle& circle)
{
    QGeoBoundingCircle oldCircle = m_circle;
    m_circle = circle;
    synchronizeDeclarative(oldCircle, false);
}

QGeoBoundingCircle QDeclarativeGeoBoundingCircle::circle() const
{
    return m_circle;
}

/*!
    \internal
*/
QGeoBoundingArea QDeclarativeGeoBoundingCircle::area() const
{
    return circle();
}

/*!
    \qmlmethod bool QDeclarativeGeoBoundingCircle::contains(Coordinate coordinate)

    Returns the true if \a coordinate is within the bounding circle; otherwise returns false.
*/
bool QDeclarativeGeoBoundingCircle::contains(QDeclarativeCoordinate *coordinate)
{
    if (!coordinate)
        return false;

    return m_circle.contains(coordinate->coordinate());
}

/*!
    \qmlproperty Coordinate BoundingCircle::center

    This property holds the coordinate of the center of the bounding circle.

    Note: this property's changed() signal is currently emitted only if the
    whole element changes, not if only the contents of the element change.
*/
QDeclarativeCoordinate* QDeclarativeGeoBoundingCircle::center()
{
    if (!m_center) {
        m_center = new QDeclarativeCoordinate(m_circle.center(), this);
        connect(m_center, SIGNAL(coordinateChanged(QGeoCoordinate)),
                this, SLOT(coordinateChanged()));
    }

    return m_center;
}

void QDeclarativeGeoBoundingCircle::setCenter(QDeclarativeCoordinate *coordinate)
{
    if (m_center == coordinate)
        return;

    if (m_center) {
        disconnect(m_center, SIGNAL(coordinateChanged(QGeoCoordinate)),
                   this, SLOT(coordinateChanged()));

        if (m_center->parent() == this)
            delete m_center;
    }

    m_center = coordinate;

    if (m_center) {
        connect(m_center, SIGNAL(coordinateChanged(QGeoCoordinate)),
                this, SLOT(coordinateChanged()));
    }

    QGeoBoundingCircle oldCircle = m_circle;
    m_circle.setCenter(coordinate ? coordinate->coordinate() : QGeoCoordinate());
    synchronizeDeclarative(oldCircle, true);

    emit centerChanged();
}

/*!
    \qmlproperty qreal BoundingCircle::radius

    This property holds the radius of the bounding circle in meters.

    The default value for the radius is -1 indicating an invalid bounding circle area.
*/
qreal QDeclarativeGeoBoundingCircle::radius() const
{
    return m_radius;
}

void QDeclarativeGeoBoundingCircle::setRadius(qreal radius)
{
    QGeoBoundingCircle oldCircle = m_circle;
    m_circle.setRadius(radius);
    synchronizeDeclarative(oldCircle, false);
}

/*!
    \internal
*/
void QDeclarativeGeoBoundingCircle::coordinateChanged()
{
    QDeclarativeCoordinate *c = qobject_cast<QDeclarativeCoordinate *>(sender());
    if (!c)
        return;

    QGeoBoundingCircle oldCircle = m_circle;

    if (c == m_center) {
        m_circle.setCenter(c->coordinate());
        synchronizeDeclarative(oldCircle, true);
    }
}

/*!
    \internal
*/
void QDeclarativeGeoBoundingCircle::synchronizeDeclarative(const QGeoBoundingCircle &old, bool skipCenter)
{
    if (!skipCenter && m_center && old.center() != m_circle.center())
        m_center->setCoordinate(m_circle.center());

    // Check not to compare two Not a Numbers, which by definition is 'false'.
    if ((!qIsNaN(old.radius()) || !qIsNaN(m_circle.radius())) && old.radius() != m_circle.radius()) {
        m_radius = m_circle.radius();
        emit radiusChanged();
    }
}

#include "moc_qdeclarativegeoboundingcircle_p.cpp"

QT_END_NAMESPACE