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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 2017-2021 Payara Foundation and/or its affiliates. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * https://github.com/payara/Payara/blob/master/LICENSE.txt
 * See the License for the specific
 * language governing permissions and limitations under the License.
 *
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at glassfish/legal/LICENSE.txt.
 *
 * GPL Classpath Exception:
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 * exception as provided by the Payara Foundation in the GPL Version 2 section of the License
 * file that accompanied this code.
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 * If applicable, add the following below the License Header, with the fields
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package fish.payara.nucleus.microprofile.config.source;

import java.security.AccessController;
import java.security.PrivilegedAction;
import java.util.Map;
import java.util.Set;

import org.eclipse.microprofile.config.spi.ConfigSource;

/**
 *
 * @author Steve Millidge (Payara Foundation)
 */
public class EnvironmentConfigSource implements ConfigSource {

    @Override
    public Map getProperties() {
        return getEnv();
    }

    @Override
    public Set getPropertyNames() {
        return getProperties().keySet();
    }

    @Override
    public int getOrdinal() {
        String ordinalVal = getEnv().getOrDefault("config_ordinal", "300");
        return Integer.parseInt(ordinalVal);
    }

    @Override
    public String getValue(String propertyName) {

        // search environment variables as defined in the spec
        // https://github.com/eclipse/microprofile-config/blob/master/spec/src/main/asciidoc/configsources.asciidoc

        //Done this way to resolve PAYARA-3064 instead of genenv(propertyname)
        //as windows is case-insensitive but Java is not
        String result = getEnv(propertyName);

        if (result == null) {
            // replace all non-alphanumeric characters
            propertyName = propertyName.replaceAll("[^A-Za-z0-9]", "_");
            result = getEnv(propertyName);
        }

        if (result == null) {
            propertyName = propertyName.toUpperCase();
        }
        return getEnv(propertyName);
    }

    @Override
    public String getName() {
        return "Environment";
    }

    private static Map getEnv() {
        final PrivilegedAction> action = System::getenv;
        return AccessController.doPrivileged(action);
    }

    private static String getEnv(final String propertyName) {
        return getEnv().get(propertyName);
    }
}