/*
    * 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.myfaces.tobago.example.demo;
  
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import javax.enterprise.context.ApplicationScoped;
  import javax.enterprise.context.NormalScope;
  import javax.faces.context.FacesContext;
  import javax.inject.Named;
  import javax.servlet.ServletContext;
  import java.io.FileInputStream;
  import java.io.IOException;
  import java.lang.invoke.MethodHandles;
  import java.util.ArrayList;
  import java.util.List;
  import java.util.Map;
  import java.util.Properties;
  
  /**
   * The server info class makes some information about the system and application available in the demo.
   * This is enabled by default, but can be disabled by configuration in a properties file with the key
   * <code>{@value #ENABLED_KEY}</code>.
   * The default file name is <code>{@value #CONFIG_FILE_DEFAULT}</code>.
   * The file name can be changed with a system property with name <code>{@value #CONFIG_FILE}</code>.
   */
  @ApplicationScoped
  @Named
  public class ServerInfo {
  
    private static final Logger LOG = LoggerFactory.getLogger(MethodHandles.lookup().lookupClass());
  
    private static final String CONFIG_FILE = "org.apache.myfaces.tobago.example.demo.config.file";
    private static final String CONFIG_FILE_DEFAULT = "/etc/tobago-example-demo.properties";
    private static final String ENABLED_KEY = "server.info.enabled";
  
    private String version;
  
    /**
     * Enabled the Server Info. May be disabled for security reasons. Default is true.
     */
    private boolean enabled = true;
  
    public ServerInfo() {
      String file = System.getProperty(CONFIG_FILE);
      try {
        if (file == null) {
          file = CONFIG_FILE_DEFAULT;
        }
        LOG.info("Loading config from file '" + file + "'");
        final Properties config = new Properties();
        config.load(new FileInputStream(file));
        enabled = Boolean.parseBoolean(config.getProperty(ENABLED_KEY));
      } catch (final IOException e) {
        LOG.warn("Can't load config: " + e.getMessage());
      }
      // the tobago version should be set in any case
      LOG.info("server.info.enabled=" + enabled);
      version = Package.getPackage("org.apache.myfaces.tobago.component").getImplementationVersion();
    }
  
    public String getServerInfo() {
      if (enabled) {
        return ((ServletContext) FacesContext.getCurrentInstance().getExternalContext().getContext()).getServerInfo();
      } else {
        return null;
      }
    }
  
    public Properties getSystemProperties() {
      return enabled ? System.getProperties() : null;
    }
  
    public List<Map.Entry<Object, Object>> getSystemPropertiesAsList() {
      return enabled ? new ArrayList<>(getSystemProperties().entrySet()) : null;
    }
  
    public String getVersion() {
      return version;
    }
  
   public String getJsfTitle() {
     return enabled ? FacesContext.class.getPackage().getImplementationTitle() : null;
   }
 
   public String getJsfVersion() {
     return enabled ? FacesContext.class.getPackage().getImplementationVersion() : null;
   }
 
   public String getCdiTitle() {
     return enabled ? NormalScope.class.getPackage().getImplementationTitle() : null;
   }
 
   public String getCdiVersion() {
     return enabled ? NormalScope.class.getPackage().getImplementationVersion() : null;
   }
 
   public boolean isEnabled() {
     return enabled;
   }
 }