/**
 * 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.ambari.server.controller.internal;

import java.util.Arrays;
import java.util.Collections;
import java.util.HashSet;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;

import org.apache.ambari.server.AmbariException;
import org.apache.ambari.server.controller.AmbariManagementController;
import org.apache.ambari.server.controller.RepositoryRequest;
import org.apache.ambari.server.controller.RepositoryResponse;
import org.apache.ambari.server.controller.spi.NoSuchParentResourceException;
import org.apache.ambari.server.controller.spi.NoSuchResourceException;
import org.apache.ambari.server.controller.spi.Predicate;
import org.apache.ambari.server.controller.spi.Request;
import org.apache.ambari.server.controller.spi.RequestStatus;
import org.apache.ambari.server.controller.spi.Resource;
import org.apache.ambari.server.controller.spi.Resource.Type;
import org.apache.ambari.server.controller.spi.ResourceAlreadyExistsException;
import org.apache.ambari.server.controller.spi.SystemException;
import org.apache.ambari.server.controller.spi.UnsupportedPropertyException;
import org.apache.ambari.server.controller.utilities.PropertyHelper;

public class RepositoryResourceProvider extends AbstractControllerResourceProvider {

  public static final String REPOSITORY_NAME_PROPERTY_ID = PropertyHelper
      .getPropertyId("Repositories", "repo_name");

  public static final String STACK_NAME_PROPERTY_ID = PropertyHelper
      .getPropertyId("Repositories", "stack_name");

  public static final String STACK_VERSION_PROPERTY_ID = PropertyHelper
      .getPropertyId("Repositories", "stack_version");

  public static final String OS_TYPE_PROPERTY_ID = PropertyHelper
      .getPropertyId("Repositories", "os_type");

  public static final String REPOSITORY_BASE_URL_PROPERTY_ID = PropertyHelper
      .getPropertyId("Repositories", "base_url");

  public static final String REPOSITORY_OS_TYPE_PROPERTY_ID = PropertyHelper
      .getPropertyId("Repositories", "os_type");

  public static final String REPO_ID_PROPERTY_ID = PropertyHelper
      .getPropertyId("Repositories", "repo_id");

  public static final String REPOSITORY_MIRRORS_LIST_PROPERTY_ID = PropertyHelper
      .getPropertyId("Repositories", "mirrors_list");
  
  public static final String REPOSITORY_DEFAULT_BASE_URL_PROPERTY_ID = PropertyHelper
      .getPropertyId("Repositories", "default_base_url");
  
  public static final String REPOSITORY_VERIFY_BASE_URL_PROPERTY_ID = PropertyHelper
      .getPropertyId("Repositories", "verify_base_url");
  

  private static Set<String> pkPropertyIds = new HashSet<String>(
      Arrays.asList(new String[] { STACK_NAME_PROPERTY_ID,
              STACK_VERSION_PROPERTY_ID, OS_TYPE_PROPERTY_ID,
              REPO_ID_PROPERTY_ID }));

  public RepositoryResourceProvider(Set<String> propertyIds,
      Map<Type, String> keyPropertyIds,
      AmbariManagementController managementController) {
    super(propertyIds, keyPropertyIds, managementController);
  }
  
  @Override
  public RequestStatus updateResources(Request request, Predicate predicate)
      throws SystemException, UnsupportedPropertyException,
      NoSuchResourceException, NoSuchParentResourceException {
    
    final Set<RepositoryRequest> requests = new HashSet<RepositoryRequest>();
    
    Iterator<Map<String,Object>> iterator = request.getProperties().iterator();
    if (iterator.hasNext()) {
      for (Map<String, Object> propertyMap : getPropertyMaps(iterator.next(), predicate)) {
        requests.add(getRequest(propertyMap));
      }
    }
    
    modifyResources(new Command<Void>() {
      @Override
      public Void invoke() throws AmbariException {
        getManagementController().updateRespositories(requests);
        return null;
      }
    });
    
    return getRequestStatus(null);
  }

  @Override
  public Set<Resource> getResources(Request request, Predicate predicate)
      throws SystemException, UnsupportedPropertyException,
      NoSuchResourceException, NoSuchParentResourceException {

    final Set<RepositoryRequest> requests = new HashSet<RepositoryRequest>();

    if (predicate == null) {
      requests.add(getRequest(Collections.<String, Object>emptyMap()));
    } else {
      for (Map<String, Object> propertyMap : getPropertyMaps(predicate)) {
        requests.add(getRequest(propertyMap));
      }
    }
    Set<String> requestedIds = getRequestPropertyIds(request, predicate);

    Set<RepositoryResponse> responses = getResources(new Command<Set<RepositoryResponse>>() {
      @Override
      public Set<RepositoryResponse> invoke() throws AmbariException {
        return getManagementController().getRepositories(requests);
      }
    });

    Set<Resource> resources = new HashSet<Resource>();

    for (RepositoryResponse response : responses) {
        Resource resource = new ResourceImpl(Resource.Type.Repository);

        setResourceProperty(resource, STACK_NAME_PROPERTY_ID,
            response.getStackName(), requestedIds);

        setResourceProperty(resource, STACK_VERSION_PROPERTY_ID,
            response.getStackVersion(), requestedIds);

        setResourceProperty(resource, REPOSITORY_NAME_PROPERTY_ID,
            response.getRepoName(), requestedIds);

        setResourceProperty(resource, REPOSITORY_BASE_URL_PROPERTY_ID,
            response.getBaseUrl(), requestedIds);

        setResourceProperty(resource, REPOSITORY_OS_TYPE_PROPERTY_ID,
            response.getOsType(), requestedIds);

        setResourceProperty(resource, REPO_ID_PROPERTY_ID,
            response.getRepoId(), requestedIds);

        setResourceProperty(resource, REPOSITORY_MIRRORS_LIST_PROPERTY_ID,
            response.getMirrorsList(), requestedIds);
        
        setResourceProperty(resource, REPOSITORY_DEFAULT_BASE_URL_PROPERTY_ID,
            response.getDefaultBaseUrl(), requestedIds);

        resources.add(resource);
    }

    return resources;
  }
  
  @Override
  public RequestStatus createResources(Request request) throws SystemException,
      UnsupportedPropertyException, ResourceAlreadyExistsException,
      NoSuchParentResourceException {
    throw new SystemException("Cannot create repositories.", null);
  }
  
  @Override
  public RequestStatus deleteResources(Predicate predicate)
      throws SystemException, UnsupportedPropertyException,
      NoSuchResourceException, NoSuchParentResourceException {
    throw new SystemException("Cannot delete repositories.", null);
  }

  private RepositoryRequest getRequest(Map<String, Object> properties) {
    RepositoryRequest rr = new RepositoryRequest(
        (String) properties.get(STACK_NAME_PROPERTY_ID),
        (String) properties.get(STACK_VERSION_PROPERTY_ID),
        (String) properties.get(OS_TYPE_PROPERTY_ID),
        (String) properties.get(REPO_ID_PROPERTY_ID));
    
    if (properties.containsKey(REPOSITORY_BASE_URL_PROPERTY_ID)) {
      rr.setBaseUrl((String) properties.get(REPOSITORY_BASE_URL_PROPERTY_ID));

      if (properties.containsKey(REPOSITORY_VERIFY_BASE_URL_PROPERTY_ID)) {
        rr.setVerifyBaseUrl("true".equalsIgnoreCase(properties.get(REPOSITORY_VERIFY_BASE_URL_PROPERTY_ID).toString()));
      }
    }
    
    return rr;
  }

  @Override
  public Set<String> getPKPropertyIds() {
    return pkPropertyIds;
  }
}