export var CRS = {
  latlngToPoint: function (latlng, zoom) {
    var projectedPoint = this.projection.project(latlng),
      scale = this.scale(zoom);

    return this.transformation._transform(projectedPoint, scale);
  },
  pointToLatLng: function (point, zoom) {
    var scale = this.scale(zoom),
      untransformedPoint = this.transformation.untransform(point, scale);

    return this.projection.unproject(untransformedPoint);
  },
  project: function (latlng) {
    return this.projection.project(latlng);
  },
  unproject: function (point) {
    return this.projection.unproject(point);
  },
  scale: function (zoom) {
    return 256 * Math.pow(2, zoom);
  },
  zoom: function (scale) {
    return Math.log(scale / 256) / Math.LN2;
  },
  getProjectedBounds: function (zoom) {
    if (this.infinite) {
      return null;
    }

    var b = this.projection.bounds,
      s = this.scale(zoom),
      min = this.transformation.transform(b.min, s),
      max = this.transformation.transform(b.max, s);

    return new Bounds(min, max);
  },
  infinite: false,
  wrapLatLng: function (latlng) {
    var lng = this.wrapLng
        ? Util.wrapNum(latlng.lng, this.wrapLng, true)
        : latlng.lng,
      lat = this.wrapLat
        ? Util.wrapNum(latlng.lat, this.wrapLat, true)
        : latlng.lat,
      alt = latlng.alt;

    return new LatLng(lat, lng, alt);
  },
  wrapLatLngBounds: function (bounds) {
    var center = bounds.getCenter(),
      newCenter = this.wrapLatLng(center),
      latShift = center.lat - newCenter.lat,
      lngShift = center.lng - newCenter.lng;

    if (latShift === 0 && lngShift === 0) {
      return bounds;
    }

    var sw = bounds.getSouthWest(),
      ne = bounds.getNorthEast(),
      newSw = new LatLng(sw.lat - latShift, sw.lng - lngShift),
      newNe = new LatLng(ne.lat - latShift, ne.lng - lngShift);

    return new LatLngBounds(newSw, newNe);
  },
};