/**
    * This file Copyright (c) 2003-2017 Magnolia International
    * Ltd.  (http://www.magnolia-cms.com). All rights reserved.
    *
    *
    * This file is dual-licensed under both the Magnolia
    * Network Agreement and the GNU General Public License.
    * You may elect to use one or the other of these licenses.
    *
   * This file is distributed in the hope that it will be
   * useful, but AS-IS and WITHOUT ANY WARRANTY; without even the
   * implied warranty of MERCHANTABILITY or FITNESS FOR A
   * PARTICULAR PURPOSE, TITLE, or NONINFRINGEMENT.
   * Redistribution, except as permitted by whichever of the GPL
   * or MNA you select, is prohibited.
   *
   * 1. For the GPL license (GPL), you can redistribute and/or
   * modify this file under the terms of the GNU General
   * Public License, Version 3, as published by the Free Software
   * Foundation.  You should have received a copy of the GNU
   * General Public License, Version 3 along with this program;
   * if not, write to the Free Software Foundation, Inc., 51
   * Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
   *
   * 2. For the Magnolia Network Agreement (MNA), this file
   * and the accompanying materials are made available under the
   * terms of the MNA which accompanies this distribution, and
   * is available at http://www.magnolia-cms.com/mna.html
   *
   * Any modifications to this file must keep this entire header
   * intact.
   *
   */
  package info.magnolia.context;
  
  import info.magnolia.cms.i18n.Messages;
  import info.magnolia.cms.i18n.MessagesManager;
  import info.magnolia.cms.security.AccessManager;
  import info.magnolia.cms.security.PermissionUtil;
  import info.magnolia.cms.security.Security;
  import info.magnolia.cms.security.User;
  
  import java.io.Serializable;
  import java.util.Collection;
  import java.util.HashMap;
  import java.util.Iterator;
  import java.util.Locale;
  import java.util.Map;
  import java.util.Set;
  
  import javax.jcr.LoginException;
  import javax.jcr.RepositoryException;
  import javax.jcr.Session;
  import javax.security.auth.Subject;
  
  
  /**
   * Default implementation of the Context interface.
   */
  public abstract class AbstractContext implements Context, Serializable {
  
      @Override
      public User getUser() {
          return Security.getSystemUser();
      }
  
      @Override
      public Subject getSubject() {
          return Security.getSystemSubject();
      }
  
      /**
       * The locale for this context.
       */
      protected Locale locale;
  
      private AttributeStrategy attributeStrategy;
  
      private JCRSessionStrategy repositoryStrategy;
  
      public AttributeStrategy getAttributeStrategy() {
          return attributeStrategy;
      }
  
      public void setAttributeStrategy(AttributeStrategy strategy) {
          this.attributeStrategy = strategy;
      }
  
      public JCRSessionStrategy getRepositoryStrategy() {
          return repositoryStrategy;
      }
  
      public void setRepositoryStrategy(JCRSessionStrategy strategy) {
          this.repositoryStrategy = strategy;
      }
  
      @Override
      public Object getAttribute(String name, int scope) {
          return getAttributeStrategy().getAttribute(name, scope);
     }
 
     @Override
     public Map<String, Object> getAttributes(int scope) {
         return getAttributeStrategy().getAttributes(scope);
     }
 
     @Override
     public void removeAttribute(String name, int scope) {
         getAttributeStrategy().removeAttribute(name, scope);
     }
 
     @Override
     public void setAttribute(String name, Object value, int scope) {
         getAttributeStrategy().setAttribute(name, value, scope);
     }
 
     @Override
     public AccessManager getAccessManager(String workspace) {
         return PermissionUtil.getAccessManager(workspace, getSubject());
     }
 
     @Override
     public Session getJCRSession(String workspaceName) throws LoginException, RepositoryException {
         return getRepositoryStrategy().getSession(workspaceName);
     }
 
     /**
      * Get the attribute value.
      *
      * @param name to which value is associated to
      * @return attribute value
      */
     @Override
     public Object getAttribute(String name) {
         Object value = this.getAttribute(name, Context.LOCAL_SCOPE);
         if (null == value) {
             value = this.getAttribute(name, Context.SESSION_SCOPE);
         }
         if (null == value) {
             value = this.getAttribute(name, Context.APPLICATION_SCOPE);
         }
         return value;
     }
 
     /**
      * Merge the scopes maps.
      */
     @Override
     public Map<String, Object> getAttributes() {
         final Map<String, Object> map = new HashMap<String, Object>();
         map.putAll(this.getAttributes(Context.LOCAL_SCOPE));
         map.putAll(this.getAttributes(Context.SESSION_SCOPE));
         map.putAll(this.getAttributes(Context.APPLICATION_SCOPE));
         return map;
     }
 
     /**
      * If not yet set try to get the locale of the user. Else use the locale of the system context.
      *
      * @see Context#getLocale()
      */
     @Override
     public Locale getLocale() {
         if (locale == null) {
             final SystemContext sysctx = MgnlContext.getSystemContext();
             if (this == sysctx) {
                 // do not fall in the endless loop
                 return null;
             }
             locale = sysctx.getLocale();
         }
         return locale;
     }
 
     @Override
     public void setLocale(Locale locale) {
         this.locale = locale;
     }
 
     /**
      * TODO: This duplicates methods from MessagesManager : remove either.
      */
     @Override
     public Messages getMessages() {
         return getMessages(MessagesManager.DEFAULT_BASENAME);
     }
 
     /**
      * TODO: This duplicates methods from MessagesManager : remove either.
      */
     @Override
     public Messages getMessages(String basename) {
         return MessagesManager.getMessages(basename, getLocale());
     }
 
     // ------ Map interface methods -------
 
     /**
      * {@inheritDoc}
      */
     @Override
     public Object get(Object key) {
         return this.getAttribute(key.toString());
     }
 
     /**
      * {@inheritDoc}
      */
     @Override
     public Object put(Object key, Object value) {
         this.setAttribute(key.toString(), value, Context.LOCAL_SCOPE);
         return value;
     }
 
     /**
      * {@inheritDoc}
      */
     @Override
     public void clear() {
         for (String key : this.getAttributes().keySet()) {
             this.removeAttribute(key, Context.LOCAL_SCOPE);
         }
         throw new UnsupportedOperationException("you can not clear a magnolia context");
     }
 
     /**
      * This implementation is very slow!
      */
     @Override
     public boolean containsValue(Object value) {
         return this.getAttributes().containsValue(value);
     }
 
     /**
      * {@inheritDoc}
      */
     @Override
     public Set<Entry<String, Object>> entrySet() {
         return this.getAttributes().entrySet();
     }
 
     /**
      * {@inheritDoc}
      */
     @Override
     public boolean isEmpty() {
         return this.getAttributes().isEmpty();
     }
 
     /**
      * {@inheritDoc}
      */
     @Override
     public Set<String> keySet() {
         return this.getAttributes().keySet();
     }
 
     /**
      * {@inheritDoc}
      */
     @Override
     public void putAll(Map map) {
         for (Iterator iter = map.entrySet().iterator(); iter.hasNext(); ) {
             Entry entry = (Entry) iter.next();
             this.setAttribute(entry.getKey().toString(), entry.getValue(), Context.LOCAL_SCOPE);
         }
     }
 
     /**
      * {@inheritDoc}
      */
     @Override
     public Object remove(Object key) {
         Object obj = this.getAttribute(key.toString());
         this.removeAttribute(key.toString(), Context.LOCAL_SCOPE);
         return obj;
     }
 
     /**
      * {@inheritDoc}
      */
     @Override
     public Collection<Object> values() {
         return this.getAttributes().values();
     }
 
     /**
      * {@inheritDoc}
      */
     @Override
     public boolean containsKey(Object arg0) {
         return this.getAttributes().containsKey(arg0);
     }
 
     /**
      * {@inheritDoc}
      */
     @Override
     public int size() {
         return this.getAttributes().size();
     }
 
     /**
      * {@inheritDoc}
      */
     @Override
     public void release() {
         getRepositoryStrategy().release();
     }
 }