/*******************************************************************************
 * Copyright 2020 Graz University of Technology
 * MOA ZS has been developed in a cooperation between EGIZ
 * and Graz University of Technology.
 * Licensed under the EUPL, Version 1.2 or - as soon they will be approved by
 * the European Commission - subsequent versions of the EUPL (the "Licence");
 * You may not use this work except in compliance with the Licence.
 * You may obtain a copy of the Licence at:
 * https://joinup.ec.europa.eu/news/understanding-eupl-v12
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the Licence is distributed on an "AS IS" basis,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the Licence for the specific language governing permissions and
 * limitations under the Licence.
 *
 * This product combines work with different licenses. See the "NOTICE" text
 * file for details on the various modules and licenses.
 * The "NOTICE" text file is part of the distribution. Any derivative works
 * that you distribute must include a readable copy of the "NOTICE" text file.
 *******************************************************************************/
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;

/**
 * @author Christof Rabensteiner
 *
 */
@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);
    }
}