/*
    * #%L
    * wcm.io
    * %%
    * Copyright (C) 2014 wcm.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.
   * #L%
   */
  package io.wcm.caravan.io.http.impl;
  
  import static io.wcm.caravan.io.http.impl.CaravanHttpServiceConfig.RIBBON_HOSTS_PROPERTY;
  import static io.wcm.caravan.io.http.impl.CaravanHttpServiceConfig.RIBBON_PARAM_LISTOFSERVERS;
  
  import java.util.Map;
  
  import org.apache.commons.configuration.Configuration;
  import org.apache.commons.lang3.StringUtils;
  import org.apache.sling.commons.osgi.PropertiesUtil;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  /**
   * Validates http service configuration for service IDs.
   */
  public final class CaravanHttpServiceConfigValidator {
  
    private static final Logger log = LoggerFactory.getLogger(CaravanHttpServiceConfigValidator.class);
  
    private CaravanHttpServiceConfigValidator() {
      // static methods only
    }
  
    /**
     * Checks if a valid configuration exists for the given service ID. This does not mean that the host
     * name is correct or returns correct responses, it only checks that the minimum required configuration
     * properties are set to a value.
     * @param serviceId Service ID
     * @return true if configuration is valid
     */
    public static boolean hasValidConfiguration(String serviceId) {
      Configuration archaiusConfig = ArchaiusConfig.getConfiguration();
      return StringUtils.isNotEmpty(archaiusConfig.getString(serviceId + RIBBON_PARAM_LISTOFSERVERS));
    }
  
    /**
     * Validates service configuration when reading the configuration.
     * @param serviceId Service ID
     * @param config OSGi config
     */
    public static boolean isValidServiceConfig(String serviceId, Map<String, Object> config) {
      if (StringUtils.isBlank(serviceId)) {
        log.warn("Invalid transport layer service configuration without service ID, ignoring.", serviceId);
        return false;
      }
      String[] hosts = PropertiesUtil.toStringArray(config.get(RIBBON_HOSTS_PROPERTY));
      if (hosts == null || hosts.length == 0) {
        log.warn("Invalid transport layer service configuration for '{}' without hosts, ignoring.", serviceId);
        return false;
      }
      return true;
    }
  
    /**
     * get configuration for "THROW_EXCEPTION_FOR_STATUS_500"
     * @param serviceId
     * @return Configured value
     */
    public static boolean throwExceptionForStatus500(String serviceId) {
      return ArchaiusConfig.getConfiguration().getBoolean(serviceId + CaravanHttpServiceConfig.THROW_EXCEPTION_FOR_STATUS_500,
          CaravanHttpServiceConfig.THROW_EXCEPTION_FOR_STATUS_500_DEFAULT);
    }
  
  }