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/**
 * Copyright (C) 2015 The Gravitee team (http://gravitee.io)
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *         http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package io.gravitee.management.rest.spring;


import io.gravitee.common.util.RelaxedPropertySource;
import org.springframework.beans.BeansException;
import org.springframework.beans.factory.config.BeanFactoryPostProcessor;
import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;
import org.springframework.core.env.Environment;
import org.springframework.core.env.StandardEnvironment;

import java.util.HashMap;
import java.util.Map;

/**
 * @author David BRASSELY (david.brassely at graviteesource.com)
 * @author Nicolas GERAUD (nicolas.geraud at graviteesource.com)
 * @author GraviteeSource Team
 */
public class EnvironmentBeanFactoryPostProcessor implements BeanFactoryPostProcessor {

    private final static String[] PROPERTY_PREFIXES = new String[] {"gravitee.", "gravitee_", "GRAVITEE." , "GRAVITEE_"};

    @Override
    public void postProcessBeanFactory(ConfigurableListableBeanFactory beanFactory) throws BeansException {
        StandardEnvironment environment = (StandardEnvironment) beanFactory.getBean(Environment.class);

        if (environment != null) {
            Map systemEnvironment = environment.getSystemEnvironment();
            Map prefixlessSystemEnvironment = new HashMap<>(systemEnvironment.size());
            systemEnvironment
                    .keySet()
                    .forEach(key -> {
                        String prefixKey = key;
                        for (String propertyPrefix : PROPERTY_PREFIXES) {
                            if (key.startsWith(propertyPrefix)) {
                                prefixKey = key.substring(propertyPrefix.length());
                                break;
                            }
                        }
                        prefixlessSystemEnvironment.put(prefixKey, systemEnvironment.get(key));
                    });
            environment.getPropertySources().replace(StandardEnvironment.SYSTEM_ENVIRONMENT_PROPERTY_SOURCE_NAME,
                    new RelaxedPropertySource(StandardEnvironment.SYSTEM_ENVIRONMENT_PROPERTY_SOURCE_NAME, prefixlessSystemEnvironment));
        }
    }
}