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/*    Copyright 2014 MongoDB Inc.
 *
 *    Licensed under the Apache License, Version 2.0 (the "License");
 *    you may not use this file except in compliance with the License.
 *    You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 *    Unless required by applicable law or agreed to in writing, software
 *    distributed under the License is distributed on an "AS IS" BASIS,
 *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *    See the License for the specific language governing permissions and
 *    limitations under the License.
 */

/** @file */

#pragma once

#include <utility>
#include <vector>

#include "mongo/client/export_macros.h"
#include "mongo/db/jsobj.h"
#include "mongo/geo/coordinates.h"

namespace mongo {
namespace geo {

/**
 * Represents a 2D position (x, y).
 *
 * Example Usage:
 *
 * Coordinates2D coords(1, 2);
 * Point<Coordinates2D> point(coords);
 * Query nearQuery = QUERY("<field_name>" << NEAR(point));
 * conn.query("<db_name>.<collection_name>", nearQuery);
 */
class MONGO_CLIENT_API Coordinates2D : public Coordinates {
public:
    Coordinates2D() : _x(0), _y(0) {}

    /**
     * Coordinates2D constructor
     *
     * @param coords The coordinate values.
     *
     * @pre coords.size() == Coordinates2D::dimensionality().
     */
    explicit Coordinates2D(const std::vector<double>& coords);

    /**
     * Coordinates2D constructor
     *
     * @param coords The coordinate values.
     */
    explicit Coordinates2D(const std::pair<double, double>& coords);

    /**
     * Coordinates2D constructor
     *
     * @param x The x coordinate value.
     * @param y The y coordinate value.
     */
    Coordinates2D(double x, double y) : _x(x), _y(y) {}

    /**
     * Get the x coordinate.
     *
     * @return double The x coordinate value.
     */
    double getX() const {
        return _x;
    }

    /**
     * Get the y coordinate.
     *
     * @return double The y coordinate value.
     */
    double getY() const {
        return _y;
    }

    /**
     * Get the x and y coordinates.
     *
     * @return std::vector<double> A vector [x, y] of this object's
     * coordinate values.
     */
    virtual std::vector<double> getValues() const;

    /**
     * Get the x and y coordinates as a std::pair.
     *
     * @return std::pair<double, double> A std::pair (x, y) of this
     * object's coordinate values.
     */
    std::pair<double, double> getValuesAsPair() const;

    /**
     * Get a BSON representation of the coordinates.
     *
     * @return BSONObj A BSONObj of the coordinates, structured as:
     * { "coordinates" : [ x, y ] }
     */
    virtual BSONObj toBSON() const;

    /**
     * Get the value of this coordinate at the given dimension.
     *
     * @param dimension 0 -> x, 1 -> y, any other input
     * besides 0 or 1 is an error.
     *
     * @return The coordinate value at the given dimension.
     *
     * @pre 0 <= dimension < Coordinates2D::dimensionality()
     */
    virtual double operator[](size_t dimension) const;

    /**
     * Get the dimensionality of this coordinate type.
     *
     * @return 2, the number of dimensions in Coordinates2D.
     */
    static size_t MONGO_CLIENT_FUNC dimensionality() {
        return 2;
    }

private:
    double _x;
    double _y;
};

}  // namespace geo
}  // namespace mongo