/*
    * 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.chemistry.opencmis.client.bindings.spi.atompub;
  
  import java.io.IOException;
  import java.io.OutputStream;
  import java.math.BigInteger;
  import java.util.ArrayList;
  import java.util.HashMap;
  import java.util.List;
  import java.util.Map;
  
  import javax.xml.stream.XMLStreamException;
  
  import org.apache.chemistry.opencmis.client.bindings.spi.BindingSession;
  import org.apache.chemistry.opencmis.client.bindings.spi.atompub.objects.AtomElement;
  import org.apache.chemistry.opencmis.client.bindings.spi.atompub.objects.AtomEntry;
  import org.apache.chemistry.opencmis.client.bindings.spi.atompub.objects.AtomFeed;
  import org.apache.chemistry.opencmis.client.bindings.spi.atompub.objects.AtomLink;
  import org.apache.chemistry.opencmis.client.bindings.spi.http.Output;
  import org.apache.chemistry.opencmis.client.bindings.spi.http.Response;
  import org.apache.chemistry.opencmis.commons.data.ExtensionsData;
  import org.apache.chemistry.opencmis.commons.data.RepositoryInfo;
  import org.apache.chemistry.opencmis.commons.definitions.TypeDefinition;
  import org.apache.chemistry.opencmis.commons.definitions.TypeDefinitionContainer;
  import org.apache.chemistry.opencmis.commons.definitions.TypeDefinitionList;
  import org.apache.chemistry.opencmis.commons.exceptions.CmisConnectionException;
  import org.apache.chemistry.opencmis.commons.exceptions.CmisInvalidArgumentException;
  import org.apache.chemistry.opencmis.commons.exceptions.CmisObjectNotFoundException;
  import org.apache.chemistry.opencmis.commons.impl.Constants;
  import org.apache.chemistry.opencmis.commons.impl.UrlBuilder;
  import org.apache.chemistry.opencmis.commons.impl.dataobjects.TypeDefinitionContainerImpl;
  import org.apache.chemistry.opencmis.commons.impl.dataobjects.TypeDefinitionListImpl;
  import org.apache.chemistry.opencmis.commons.spi.RepositoryService;
  
  /**
   * Repository Service AtomPub client.
   */
  public class RepositoryServiceImpl extends AbstractAtomPubService implements RepositoryService {
  
      /**
       * Constructor.
       */
      public RepositoryServiceImpl(BindingSession session) {
          setSession(session);
      }
  
      @Override
      public List<RepositoryInfo> getRepositoryInfos(ExtensionsData extension) {
          return getRepositoriesInternal(null);
      }
  
      @Override
      public RepositoryInfo getRepositoryInfo(String repositoryId, ExtensionsData extension) {
          List<RepositoryInfo> repositoryInfos = getRepositoriesInternal(repositoryId);
  
          if (repositoryInfos.isEmpty()) {
              throw new CmisObjectNotFoundException("Repository '" + repositoryId + "' not found!");
          }
  
          // find the repository
          for (RepositoryInfo info : repositoryInfos) {
              if (info.getId() == null) {
                  continue;
              }
  
              if (info.getId().equals(repositoryId)) {
                  return info;
              }
          }
  
          throw new CmisObjectNotFoundException("Repository '" + repositoryId + "' not found!");
      }
  
      @Override
      public TypeDefinition getTypeDefinition(String repositoryId, String typeId, ExtensionsData extension) {
          return getTypeDefinitionInternal(repositoryId, typeId);
      }
  
      @Override
      public TypeDefinitionList getTypeChildren(String repositoryId, String typeId, Boolean includePropertyDefinitions,
              BigInteger maxItems, BigInteger skipCount, ExtensionsData extension) {
          TypeDefinitionListImpl result = new TypeDefinitionListImpl();
 
         // find the link
         String link = null;
         if (typeId == null) {
             link = loadCollection(repositoryId, Constants.COLLECTION_TYPES);
         } else {
             link = loadTypeLink(repositoryId, typeId, Constants.REL_DOWN, Constants.MEDIATYPE_CHILDREN);
         }
 
         if (link == null) {
             throw new CmisObjectNotFoundException("Unknown repository or type!");
         }
 
         UrlBuilder url = new UrlBuilder(link);
         url.addParameter(Constants.PARAM_PROPERTY_DEFINITIONS, includePropertyDefinitions);
         url.addParameter(Constants.PARAM_MAX_ITEMS, maxItems);
         url.addParameter(Constants.PARAM_SKIP_COUNT, skipCount);
 
         // read and parse
         Response resp = read(url);
         AtomFeed feed = parse(resp.getStream(), AtomFeed.class);
 
         // handle top level
         for (AtomElement element : feed.getElements()) {
             if (element.getObject() instanceof AtomLink) {
                 if (isNextLink(element)) {
                     result.setHasMoreItems(Boolean.TRUE);
                 }
             } else if (isInt(NAME_NUM_ITEMS, element)) {
                 result.setNumItems((BigInteger) element.getObject());
             }
         }
 
         result.setList(new ArrayList<TypeDefinition>(feed.getEntries().size()));
 
         // get the children
         if (!feed.getEntries().isEmpty()) {
             for (AtomEntry entry : feed.getEntries()) {
                 TypeDefinition child = null;
 
                 lockTypeLinks();
                 try {
                     // walk through the entry
                     for (AtomElement element : entry.getElements()) {
                         if (element.getObject() instanceof AtomLink) {
                             addTypeLink(repositoryId, entry.getId(), (AtomLink) element.getObject());
                         } else if (element.getObject() instanceof TypeDefinition) {
                             child = (TypeDefinition) element.getObject();
                         }
                     }
                 } finally {
                     unlockTypeLinks();
                 }
 
                 if (child != null) {
                     result.getList().add(child);
                 }
             }
         }
 
         return result;
     }
 
     @Override
     public List<TypeDefinitionContainer> getTypeDescendants(String repositoryId, String typeId, BigInteger depth,
             Boolean includePropertyDefinitions, ExtensionsData extension) {
         List<TypeDefinitionContainer> result = new ArrayList<TypeDefinitionContainer>();
 
         // find the link
         String link = null;
         if (typeId == null) {
             link = loadRepositoryLink(repositoryId, Constants.REP_REL_TYPEDESC);
         } else {
             link = loadTypeLink(repositoryId, typeId, Constants.REL_DOWN, Constants.MEDIATYPE_DESCENDANTS);
         }
 
         if (link == null) {
             throw new CmisObjectNotFoundException("Unknown repository or type!");
         }
 
         UrlBuilder url = new UrlBuilder(link);
         url.addParameter(Constants.PARAM_DEPTH, depth);
         url.addParameter(Constants.PARAM_PROPERTY_DEFINITIONS, includePropertyDefinitions);
 
         // read and parse
         Response resp = read(url);
         AtomFeed feed = parse(resp.getStream(), AtomFeed.class);
 
         // process tree
         addTypeDescendantsLevel(repositoryId, feed, result);
 
         return result;
     }
 
     /**
      * Adds type descendants level recursively.
      */
     private void addTypeDescendantsLevel(String repositoryId, AtomFeed feed, List<TypeDefinitionContainer> containerList) {
         if (feed == null || feed.getEntries().isEmpty()) {
             return;
         }
 
         // walk through the feed
         for (AtomEntry entry : feed.getEntries()) {
             TypeDefinitionContainerImpl childContainer = null;
             List<TypeDefinitionContainer> childContainerList = new ArrayList<TypeDefinitionContainer>();
 
             // walk through the entry
             lockTypeLinks();
             try {
                 for (AtomElement element : entry.getElements()) {
                     if (element.getObject() instanceof AtomLink) {
                         addTypeLink(repositoryId, entry.getId(), (AtomLink) element.getObject());
                     } else if (element.getObject() instanceof TypeDefinition) {
                         childContainer = new TypeDefinitionContainerImpl((TypeDefinition) element.getObject());
                     } else if (element.getObject() instanceof AtomFeed) {
                         addTypeDescendantsLevel(repositoryId, (AtomFeed) element.getObject(), childContainerList);
                     }
                 }
             } finally {
                 unlockTypeLinks();
             }
 
             if (childContainer != null) {
                 childContainer.setChildren(childContainerList);
                 containerList.add(childContainer);
             }
         }
     }
 
     @Override
     public TypeDefinition createType(String repositoryId, TypeDefinition type, ExtensionsData extension) {
         if (type == null) {
             throw new CmisInvalidArgumentException("Type definition must be set!");
         }
 
         String parentId = type.getParentTypeId();
         if (parentId == null) {
             throw new CmisInvalidArgumentException("Type definition has no parent type ID!");
         }
 
         // find the link
         String link = loadTypeLink(repositoryId, parentId, Constants.REL_DOWN, Constants.MEDIATYPE_CHILDREN);
 
         if (link == null) {
             throw new CmisObjectNotFoundException("Unknown repository or parent type!");
         }
 
         // set up writer
         final AtomEntryWriter entryWriter = new AtomEntryWriter(type, getCmisVersion(repositoryId));
 
         // post the new type definition
         Response resp = post(new UrlBuilder(link), Constants.MEDIATYPE_ENTRY, new Output() {
             @Override
             public void write(OutputStream out) throws XMLStreamException, IOException {
                 entryWriter.write(out);
             }
         });
 
         // parse the response
         AtomEntry entry = parse(resp.getStream(), AtomEntry.class);
 
         // we expect a CMIS entry
         if (entry.getId() == null) {
             throw new CmisConnectionException("Received Atom entry is not a CMIS entry!");
         }
 
         lockTypeLinks();
         TypeDefinition result = null;
         try {
             // clean up cache
             removeTypeLinks(repositoryId, entry.getId());
 
             // walk through the entry
             for (AtomElement element : entry.getElements()) {
                 if (element.getObject() instanceof AtomLink) {
                     addTypeLink(repositoryId, entry.getId(), (AtomLink) element.getObject());
                 } else if (element.getObject() instanceof TypeDefinition) {
                     result = (TypeDefinition) element.getObject();
                 }
             }
         } finally {
             unlockTypeLinks();
         }
 
         return result;
     }
 
     @Override
     public TypeDefinition updateType(String repositoryId, TypeDefinition type, ExtensionsData extension) {
         if (type == null) {
             throw new CmisInvalidArgumentException("Type definition must be set!");
         }
 
         String typeId = type.getId();
         if (typeId == null) {
             throw new CmisInvalidArgumentException("Type definition has no type ID!");
         }
 
         // find the link
         Map<String, Object> parameters = new HashMap<String, Object>();
         parameters.put(Constants.PARAM_ID, typeId);
 
         String link = loadTemplateLink(repositoryId, Constants.TEMPLATE_TYPE_BY_ID, parameters);
         if (link == null) {
             throw new CmisObjectNotFoundException("Unknown repository or type!");
         }
 
         // set up writer
         final AtomEntryWriter entryWriter = new AtomEntryWriter(type, getCmisVersion(repositoryId));
 
         // post the new type definition
         Response resp = put(new UrlBuilder(link), Constants.MEDIATYPE_ENTRY, new Output() {
             @Override
             public void write(OutputStream out) throws XMLStreamException, IOException {
                 entryWriter.write(out);
             }
         });
 
         // parse the response
         AtomEntry entry = parse(resp.getStream(), AtomEntry.class);
 
         // we expect a CMIS entry
         if (entry.getId() == null) {
             throw new CmisConnectionException("Received Atom entry is not a CMIS entry!");
         }
 
         lockTypeLinks();
         TypeDefinition result = null;
         try {
             // clean up cache
             removeTypeLinks(repositoryId, entry.getId());
 
             // walk through the entry
             for (AtomElement element : entry.getElements()) {
                 if (element.getObject() instanceof AtomLink) {
                     addTypeLink(repositoryId, entry.getId(), (AtomLink) element.getObject());
                 } else if (element.getObject() instanceof TypeDefinition) {
                     result = (TypeDefinition) element.getObject();
                 }
             }
         } finally {
             unlockTypeLinks();
         }
 
         return result;
     }
 
     @Override
     public void deleteType(String repositoryId, String typeId, ExtensionsData extension) {
         Map<String, Object> parameters = new HashMap<String, Object>();
         parameters.put(Constants.PARAM_ID, typeId);
 
         String link = loadTemplateLink(repositoryId, Constants.TEMPLATE_TYPE_BY_ID, parameters);
         if (link == null) {
             throw new CmisObjectNotFoundException("Unknown repository!");
         }
 
         delete(new UrlBuilder(link));
     }
 }