/*
    * 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.syncope.core.provisioning.java.pushpull;
  
  import java.util.ArrayList;
  import java.util.List;
  import java.util.Map;
  import java.util.Optional;
  import java.util.function.Function;
  import java.util.stream.Collectors;
  import org.apache.syncope.common.lib.policy.DefaultPullCorrelationRuleConf;
  import org.apache.syncope.common.lib.policy.PullCorrelationRuleConf;
  import org.apache.syncope.common.lib.to.Item;
  import org.apache.syncope.common.lib.to.Provision;
  import org.apache.syncope.core.persistence.api.dao.search.AnyCond;
  import org.apache.syncope.core.persistence.api.dao.search.AttrCond;
  import org.apache.syncope.core.persistence.api.dao.search.SearchCond;
  import org.apache.syncope.core.provisioning.api.rules.PullCorrelationRule;
  import org.apache.syncope.core.provisioning.api.rules.PullCorrelationRuleConfClass;
  import org.identityconnectors.framework.common.objects.Attribute;
  import org.identityconnectors.framework.common.objects.SyncDelta;
  
  @PullCorrelationRuleConfClass(DefaultPullCorrelationRuleConf.class)
  public class DefaultPullCorrelationRule implements PullCorrelationRule {
  
      private DefaultPullCorrelationRuleConf conf;
  
      @Override
      public void setConf(final PullCorrelationRuleConf conf) {
          if (conf instanceof DefaultPullCorrelationRuleConf) {
              this.conf = DefaultPullCorrelationRuleConf.class.cast(conf);
          } else {
              throw new IllegalArgumentException(
                      DefaultPullCorrelationRuleConf.class.getName() + " expected, got " + conf.getClass().getName());
          }
      }
  
      @Override
      public SearchCond getSearchCond(final SyncDelta syncDelta, final Provision provision) {
          Map<String, Item> mappingItems = provision.getMapping().getItems().stream().
                  collect(Collectors.toMap(Item::getIntAttrName, Function.identity()));
  
          // search for anys by attribute(s) specified in the policy
          List<SearchCond> searchConds = new ArrayList<>();
  
          conf.getSchemas().forEach(schema -> {
              Attribute attr = Optional.ofNullable(mappingItems.get(schema)).
                      map(item -> syncDelta.getObject().getAttributeByName(item.getExtAttrName())).orElse(null);
              if (attr == null) {
                  throw new IllegalArgumentException(
                          "Connector object does not contains the attributes to perform the search: " + schema);
              }
  
              AttrCond.Type type;
              String expression = null;
  
              if (attr.getValue() == null || attr.getValue().isEmpty()
                      || (attr.getValue().size() == 1 && attr.getValue().get(0) == null)) {
  
                  type = AttrCond.Type.ISNULL;
              } else {
                  type = AttrCond.Type.EQ;
                  expression = attr.getValue().size() > 1
                          ? attr.getValue().toString()
                          : attr.getValue().get(0).toString();
              }
  
              AttrCond cond = "key".equalsIgnoreCase(schema)
                      || "username".equalsIgnoreCase(schema) || "name".equalsIgnoreCase(schema)
                      ? new AnyCond()
                      : new AttrCond();
              cond.setSchema(schema);
              cond.setType(type);
              cond.setExpression(expression);
  
              searchConds.add(SearchCond.getLeaf(cond));
          });
  
          return conf.isOrSchemas()
                  ? SearchCond.getOr(searchConds)
                  : SearchCond.getAnd(searchConds);
      }
  }