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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.node.container.spring.env;

import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import org.springframework.beans.factory.config.BeanFactoryPostProcessor;
import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;
import org.springframework.context.ApplicationContext;
import org.springframework.core.Ordered;
import org.springframework.core.env.ConfigurableEnvironment;
import org.springframework.core.env.Environment;
import org.springframework.core.env.StandardEnvironment;

/**
 * @author David BRASSELY (david.brassely at graviteesource.com)
 * @author GraviteeSource Team
 */
public class EnvironmentPropertySourceBeanProcessor implements BeanFactoryPostProcessor, Ordered {

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

    EnvironmentPropertySourceBeanProcessor(Environment environment, ApplicationContext applicationContext) {
        this.environment = environment;
        this.applicationContext = applicationContext;
    }

    @Override
    public int getOrder() {
        return Ordered.HIGHEST_PRECEDENCE;
    }

    @Override
    public void postProcessBeanFactory(ConfigurableListableBeanFactory beanFactory) {
        Map source = new ConcurrentHashMap<>();
        ((StandardEnvironment) environment).getSystemEnvironment()
            .forEach((key, value) -> {
                for (String propertyPrefix : PROPERTY_PREFIXES) {
                    if (key.startsWith(propertyPrefix)) {
                        source.put(key.substring(propertyPrefix.length()), value);
                    }
                }
            });

        ((ConfigurableEnvironment) environment).getPropertySources()
            .addFirst(new GraviteeEnvironmentPropertySource("graviteeEnvironmentPropertySource", source, applicationContext));
    }
}