#ifndef MBGL_UTIL_GEO
#define MBGL_UTIL_GEO

#include <mbgl/util/vec.hpp>

#include <cmath>

namespace mbgl {

class TileID;

struct PrecisionPoint {
    double x = 0;
    double y = 0;

    inline PrecisionPoint(double x_ = 0, double y_ = 0)
        : x(x_), y(y_) {}

    inline bool isValid() const {
        return !(std::isnan(x) || std::isnan(y));
    }
};

struct LatLng {
    double latitude = 0;
    double longitude = 0;

    inline LatLng(double lat = 0, double lon = 0)
        : latitude(lat), longitude(lon) {}

    inline bool isValid() const {
        return !(std::isnan(latitude) || std::isnan(longitude));
    }

    // Constructs a LatLng object with the top left position of the specified tile.
    LatLng(const TileID& id);

    PrecisionPoint project() const;
};

struct ProjectedMeters {
    double northing = 0;
    double easting = 0;

    inline ProjectedMeters(double n = 0, double e = 0)
        : northing(n), easting(e) {}

    inline bool isValid() const {
        return !(std::isnan(northing) || std::isnan(easting));
    }
};

struct LatLngBounds {
    LatLng sw = {90, 180};
    LatLng ne = {-90, -180};

    inline LatLngBounds(LatLng sw_ = {90, 180}, LatLng ne_ = {-90, -180})
        : sw(sw_), ne(ne_) {}

    inline bool isValid() const {
        return sw.isValid() && ne.isValid();
    }

    // Constructs a LatLngBounds object with the tile's exact boundaries.
    LatLngBounds(const TileID& id);

    inline void extend(const LatLng& point) {
        if (point.latitude < sw.latitude) sw.latitude = point.latitude;
        if (point.latitude > ne.latitude) ne.latitude = point.latitude;
        if (point.longitude < sw.longitude) sw.longitude = point.longitude;
        if (point.longitude > ne.longitude) ne.longitude = point.longitude;
    }

    inline void extend(const LatLngBounds& bounds) {
        extend(bounds.sw);
        extend(bounds.ne);
    }

    inline bool contains(const LatLng& point) const {
        return (point.latitude  >= sw.latitude  &&
                point.latitude  <= ne.latitude  &&
                point.longitude >= sw.longitude &&
                point.longitude <= ne.longitude);
    }

    inline bool intersects(const LatLngBounds area) const {
        return (area.ne.latitude  > sw.latitude  &&
                area.sw.latitude  < ne.latitude  &&
                area.ne.longitude > sw.longitude &&
                area.sw.longitude < ne.longitude);
    }
};

}

#endif