// 3rd party.
import React, {useEffect, useState} from 'react';

export function useSelfEntity(app) {
  const [selfEntity, setSelfEntity] = useState();
  useEffect(() => {
    const onSelfEntityChanged = () => {
      const selfEntity = app.selfEntity;
      setSelfEntity(selfEntity);
    };
    onSelfEntityChanged();
    app.on('selfEntityChanged', onSelfEntityChanged);
    return () => {
      app.off('selfEntityChanged', onSelfEntityChanged);
    }
  }, [selfEntity]);
  return selfEntity;
}