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#include "locationsingleton.h"
#include <QtPositioning/private/qwebmercator_p.h>
#include <QtPositioning/private/qdoublevector2d_p.h>
#include <QDebug>

static QGeoCoordinate parseCoordinate(const QJSValue &value, bool *ok)
{
    QGeoCoordinate c;

    if (value.isObject()) {
        if (value.hasProperty(QStringLiteral("latitude")))
            c.setLatitude(value.property(QStringLiteral("latitude")).toNumber());
        if (value.hasProperty(QStringLiteral("longitude")))
            c.setLongitude(value.property(QStringLiteral("longitude")).toNumber());
        if (value.hasProperty(QStringLiteral("altitude")))
            c.setAltitude(value.property(QStringLiteral("altitude")).toNumber());

        if (ok)
            *ok = true;
    }

    return c;
}


/*!
    \qmltype QtPositioning
    \instantiates LocationSingleton
    \inqmlmodule QtPositioning
    \since 5.2

    \brief The QtPositioning global object provides useful functions for working with location-based
           types in QML.

    \qml
    import QtPositioning 5.2

    Item {
        property variant coordinate: QtPositioning.coordinate(-27.5, 153.1)
    }
    \endqml
*/

LocationSingleton::LocationSingleton(QObject *parent)
:   QObject(parent)
{
}

/*!
    \qmlmethod coordinate ::QtPositioning::coordinate()

    Constructs an invalid coordinate.

*/
QGeoCoordinate LocationSingleton::coordinate() const
{
    return QGeoCoordinate();
}

/*!
    \qmlmethod coordinate QtPositioning::coordinate(real latitude, real longitude, real altitude) const

    Constructs a coordinate with the specified \a latitude, \a longitude and optional \a altitude.
    Both \a latitude and \a longitude must be valid, otherwise an invalid coordinate is returned.

    \sa {coordinate}
*/
QGeoCoordinate LocationSingleton::coordinate(double latitude, double longitude, double altitude) const
{
    return QGeoCoordinate(latitude, longitude, altitude);
}

/*!
    \qmlmethod geoshape QtPositioning::shape() const

    Constructs an invalid geoshape.

    \sa {geoshape}
*/
QGeoShape LocationSingleton::shape() const
{
    return QGeoShape();
}

/*!
    \qmlmethod georectangle QtPositioning::rectangle() const

    Constructs an invalid georectangle.

    \sa {georectangle}
*/
QGeoRectangle LocationSingleton::rectangle() const
{
    return QGeoRectangle();
}

/*!
    \qmlmethod georectangle QtPositioning::rectangle(coordinate center, real width, real height) const

    Constructs a georectangle centered at \a center with a width of \a width degrees and a hight of
    \a height degrees.

    \sa {georectangle}
*/
QGeoRectangle LocationSingleton::rectangle(const QGeoCoordinate &center,
                                           double width, double height) const
{
    return QGeoRectangle(center, width, height);
}

/*!
    \qmlmethod georectangle QtPositioning::rectangle(coordinate topLeft, coordinate bottomRight) const

    Constructs a georectangle with its top left corner positioned at \a topLeft and its bottom
    right corner positioned at \a {bottomRight}.

    \sa {georectangle}
*/
QGeoRectangle LocationSingleton::rectangle(const QGeoCoordinate &topLeft,
                                           const QGeoCoordinate &bottomRight) const
{
    return QGeoRectangle(topLeft, bottomRight);
}

/*!
    \qmlmethod georectangle QtLocation5::QtLocation::rectangle(list<coordinate> coordinates) const

    Constructs a georectangle from the list of coordinates, the returned list is the smallest possible
    containing all the coordinates.

    \sa {georectangle}
*/
QGeoRectangle LocationSingleton::rectangle(const QVariantList &coordinates) const
{
    QList<QGeoCoordinate> internalCoordinates;
    for (int i = 0; i < coordinates.size(); i++) {
        if (coordinates.at(i).canConvert<QGeoCoordinate>())
            internalCoordinates << coordinates.at(i).value<QGeoCoordinate>();
    }
    return QGeoRectangle(internalCoordinates);
}

/*!
    \qmlmethod geocircle QtPositioning::circle() const

    Constructs an invalid geocircle.

    \sa {geocircle}
*/
QGeoCircle LocationSingleton::circle() const
{
    return QGeoCircle();
}

/*!
    \qmlmethod geocircle QtPositioning::circle(coordinate center, real radius) const

    Constructs a geocircle centered at \a center with a radius of \a radius meters.
*/
QGeoCircle LocationSingleton::circle(const QGeoCoordinate &center, qreal radius) const
{
    return QGeoCircle(center, radius);
}

/*!
    \qmlmethod geopath QtPositioning::path() const

    Constructs an empty geopath.

    \sa {geopath}
    \since 5.9
*/
QGeoPath LocationSingleton::path() const
{
    return QGeoPath();
}

/*!
    \qmlmethod geopath QtPositioning::path(list<coordinate> coordinates, real width) const

    Constructs a geopath from coordinates and width.

    \sa {geopath}
    \since 5.9
*/
QGeoPath LocationSingleton::path(const QJSValue &value, qreal width) const
{
    QList<QGeoCoordinate> pathList;

    if (value.isArray()) {
        quint32 length = value.property(QStringLiteral("length")).toUInt();
        for (quint32 i = 0; i < length; ++i) {
            bool ok;
            QGeoCoordinate c = parseCoordinate(value.property(i), &ok);

            if (!ok || !c.isValid()) {
                pathList.clear(); // aborting
                break;
            }

            pathList.append(c);
        }
    }

    return QGeoPath(pathList, width);
}

/*!
    \qmlmethod geopolygon QtPositioning::polygon() const

    Constructs an empty polygon.

    \sa {geopolygon}
    \since 5.10
*/
QGeoPolygon LocationSingleton::polygon() const
{
    return QGeoPolygon();
}

/*!
    \qmlmethod geopolygon QtPositioning::polygon(list<coordinate> coordinates) const

    Constructs a polygon from coordinates.

    \sa {geopolygon}
    \since 5.10
*/
QGeoPolygon LocationSingleton::polygon(const QVariantList &coordinates) const
{
    QList<QGeoCoordinate> internalCoordinates;
    for (int i = 0; i < coordinates.size(); i++) {
        if (coordinates.at(i).canConvert<QGeoCoordinate>())
            internalCoordinates << coordinates.at(i).value<QGeoCoordinate>();
    }
    return QGeoPolygon(internalCoordinates);
}

/*!
    \qmlmethod geopolygon QtPositioning::polygon(list<coordinate> perimeter, list<list<coordinate>> holes) const

    Constructs a polygon from coordinates for perimeter and inner holes.

    \sa {geopolygon}
    \since 5.12
*/
QGeoPolygon LocationSingleton::polygon(const QVariantList &perimeter, const QVariantList &holes) const
{
    QList<QGeoCoordinate> internalCoordinates;
    for (int i = 0; i < perimeter.size(); i++) {
        if (perimeter.at(i).canConvert<QGeoCoordinate>())
            internalCoordinates << perimeter.at(i).value<QGeoCoordinate>();
    }
    QGeoPolygon poly(internalCoordinates);

    for (int i = 0; i < holes.size(); i++) {
        if (holes.at(i).type() == QVariant::List) {
            QList<QGeoCoordinate> hole;
            const QVariantList &holeData = holes.at(i).toList();
            for (int j = 0; j < holeData.size(); j++) {
                if (holeData.at(j).canConvert<QGeoCoordinate>())
                    hole << holeData.at(j).value<QGeoCoordinate>();
            }
            if (hole.size())
                poly.addHole(hole);
        }
    }

    return poly;
}

/*!
    \qmlmethod geocircle QtPositioning::shapeToCircle(geoshape shape) const

    Converts \a shape to a geocircle.

    \sa {geocircle}
    \since 5.5
*/
QGeoCircle LocationSingleton::shapeToCircle(const QGeoShape &shape) const
{
    return QGeoCircle(shape);
}

/*!
    \qmlmethod georectangle QtPositioning::shapeToRectangle(geoshape shape) const

    Converts \a shape to a georectangle.

    \sa {georectangle}
    \since 5.5
*/
QGeoRectangle LocationSingleton::shapeToRectangle(const QGeoShape &shape) const
{
    return QGeoRectangle(shape);
}

/*!
    \qmlmethod geopath QtPositioning::shapeToPath(geoshape shape) const

    Converts \a shape to a geopath.

    \sa {geopath}
    \since 5.9
*/
QGeoPath LocationSingleton::shapeToPath(const QGeoShape &shape) const
{
    return QGeoPath(shape);
}

/*!
    \qmlmethod geopolygon QtPositioning::shapeToPolygon(geoshape shape) const

    Converts \a shape to a polygon.

    \sa {geopolygon}
    \since 5.10
*/
QGeoPolygon LocationSingleton::shapeToPolygon(const QGeoShape &shape) const
{
    return QGeoPolygon(shape);
}

/*!
    \qmlmethod coordinate QtPositioning::mercatorToCoord(point mercator) const

    Converts a mercator coordinate into a latitude-longitude coordinate.

    \sa {coordToMercator}
    \since 5.12
*/
QGeoCoordinate LocationSingleton::mercatorToCoord(const QPointF &mercator) const
{
    return QWebMercator::mercatorToCoord(QDoubleVector2D(mercator.x(), mercator.y()));
}

/*!
    \qmlmethod point QtPositioning::coordToMercator(coordinate coord) const

    Converts a coordinate \a coord into a mercator coordinate and returns it.
    \sa {mercatorToCoord}
    \since 5.12
*/
QPointF LocationSingleton::coordToMercator(const QGeoCoordinate &coord) const
{
    return QWebMercator::coordToMercator(coord).toPointF();
}
