(function (root, factory){
    if (typeof define === 'function' && define.amd){ // AMD
        define(factory);
    } else if (typeof module !== 'undefined' && module.exports) { // Node.js
        module.exports = factory();
    } else { // Browser
        root.GeoJSONWrapper = factory();
    }
})(this, function () {

    // conform to vectortile api
    function GeoJSONWrapper (features) {
        this.features = features;
        this.length = features.length;
    }

    GeoJSONWrapper.prototype.feature = function (i) {
        return new FeatureWrapper(this.features[i]);
    }

    function FeatureWrapper (feature) {
        this.id = typeof feature.id === 'number' ? feature.id : undefined;
        this.type = feature.type;
        this.rawGeometry = feature.type === 1 ? [feature.geometry] : feature.geometry;
        this.properties = feature.tags;
        this.extent = 4096;
    }

    FeatureWrapper.prototype.loadGeometry = function () {
        var rings = this.rawGeometry;
        this.geometry = [];

        for (var i = 0; i < rings.length; i++) {
            var ring = rings[i];
            var newRing = [];
            for (var j = 0; j < ring.length; j++) {
                newRing.push(new Point(ring[j][0], ring[j][1]));
            }
            this.geometry.push(newRing);
        }
        return this.geometry;
    }

    FeatureWrapper.prototype.bbox = function () {
        if (!this.geometry) this.loadGeometry();

        var rings = this.geometry;
        var x1 = Infinity;
        var x2 = -Infinity;
        var y1 = Infinity;
        var y2 = -Infinity;

        for (var i = 0; i < rings.length; i++) {
            var ring = rings[i];

            for (var j = 0; j < ring.length; j++) {
                var coord = ring[j];

                x1 = Math.min(x1, coord.x);
                x2 = Math.max(x2, coord.x);
                y1 = Math.min(y1, coord.y);
                y2 = Math.max(y2, coord.y);
            }
        }

        return [x1, y1, x2, y2];
    }

    FeatureWrapper.prototype.toGeoJSON = VectorTileFeature.prototype.toGeoJSON;

    return GeoJSONWrapper;

});