package at.gv.egiz.moazs.preprocess;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.core.env.ConfigurableEnvironment;
import org.springframework.core.env.EnumerablePropertySource;
import org.springframework.core.env.MutablePropertySources;
import org.springframework.stereotype.Component;

import java.util.Arrays;
import java.util.stream.Stream;
import java.util.stream.StreamSupport;

@Component
public class SpringPropertiesFacade {

    @Autowired
    private ConfigurableEnvironment env;

    /**
     * Collect all properties from Spring environment and return them as a stream.
     *
     * inspired by https://stackoverflow.com/questions/23506471/spring-access-all-environment-properties-as-a-map-or-properties-object/42521523#42521523
     * @author pedorro
     * @return
     */
    public Stream<String> getPropertyNames() {

        MutablePropertySources propSrcs = env.getPropertySources();

        return StreamSupport.stream(propSrcs.spliterator(), false)
                .filter(ps -> ps instanceof EnumerablePropertySource)
                .map(ps -> ((EnumerablePropertySource) ps).getPropertyNames())
                .flatMap(Arrays::stream);
    }

    public String getProperty(String name) {
        return env.getProperty(name);
    }
}