const overlayManager = {
  allOverlays: [],

  addOverlay(overlay) {
    this.removeOverlay(overlay);
    this.allOverlays.unshift(overlay);
  },

  isCurrentOverlay(overlay) {
    return overlay && this.allOverlays[0] === overlay;
  },

  removeOverlay(overlay) {
    const i = this.allOverlays.indexOf(overlay);
    if (i > -1) {
      this.allOverlays.splice(i, 1);
    }
  },
};

export default overlayManager;