var each = require('@turf/meta').coordEach;

/**
 * Takes a set of features, calculates the bbox of all input features, and returns a bounding box.
 *
 * @name bbox
 * @param {(Feature|FeatureCollection)} geojson input features
 * @returns {Array<number>} bbox extent in [minX, minY, maxX, maxY] order
 * @addToMap features, bboxPolygon
 * @example
 * var pt1 = turf.point([114.175329, 22.2524])
 * var pt2 = turf.point([114.170007, 22.267969])
 * var pt3 = turf.point([114.200649, 22.274641])
 * var pt4 = turf.point([114.200649, 22.274641])
 * var pt5 = turf.point([114.186744, 22.265745])
 * var features = turf.featureCollection([pt1, pt2, pt3, pt4, pt5])
 *
 * var bbox = turf.bbox(features);
 *
 * var bboxPolygon = turf.bboxPolygon(bbox);
 *
 * //=bbox
 *
 * //=bboxPolygon
 */
module.exports = function (geojson) {
    var bbox = [Infinity, Infinity, -Infinity, -Infinity];
    each(geojson, function (coord) {
        if (bbox[0] > coord[0]) bbox[0] = coord[0];
        if (bbox[1] > coord[1]) bbox[1] = coord[1];
        if (bbox[2] < coord[0]) bbox[2] = coord[0];
        if (bbox[3] < coord[1]) bbox[3] = coord[1];
    });
    return bbox;
};