/*
    * Licensed to the Apache Software Foundation (ASF) under one or more
    * contributor license agreements. See the NOTICE file distributed with
    * this work for additional information regarding copyright ownership.
    * The ASF licenses this file to You 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 org.apache.logging.log4j.catalog.api.util;
  
  import javax.servlet.ServletContext;
  import java.io.IOException;
  import java.io.InputStream;
  import java.util.Properties;
  
  /**
   * Sets the profile for the application if it hasn't already been set.
   */
  public final class ProfileUtil {
  
      private static final String SPRING_PROFILE = "spring.profiles.active";
  
      private ProfileUtil() {
      }
  
      /**
       * Set the active profile if none has been specified.
       * @param servletContext
       */
      public static void setActiveProfile(ServletContext servletContext) {
          String springProfile = System.getProperty(SPRING_PROFILE);
          if (springProfile == null) {
              springProfile = System.getenv(SPRING_PROFILE);
          }
          if (springProfile == null) {
              springProfile = servletContext.getInitParameter(SPRING_PROFILE);
          }
          if (springProfile == null) {
              Properties props = loadProperties(servletContext);
              String activeProfile = props.getProperty(SPRING_PROFILE);
              if (activeProfile == null) {
                  servletContext.setInitParameter(SPRING_PROFILE, "eclipseLink");
              }
          }
      }
  
      private static Properties loadProperties(ServletContext servletContext) {
          Properties props = new Properties();
          String env = System.getProperty("env");
          if (env == null) {
              env = System.getenv("env");
          }
          StringBuilder sb = new StringBuilder("catalog-");
          if (env != null) {
              sb.append(env);
          }
          sb.append("config.properties");
          InputStream is = ProfileUtil.class.getClassLoader().getResourceAsStream(sb.toString());
          if (is != null) {
              try {
                  props.load(is);
              } catch (IOException ioe) {
                  servletContext.log("Unable to load " + sb.toString() + ": " + ioe.getMessage());
              }
          }
          return props;
      }
  }