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/*
 * 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.solr.cloud.api.collections;

import static org.apache.solr.common.params.CollectionAdminParams.FOLLOW_ALIASES;

import java.lang.invoke.MethodHandles;
import org.apache.solr.common.SolrException;
import org.apache.solr.common.cloud.Aliases;
import org.apache.solr.common.cloud.ClusterState;
import org.apache.solr.common.cloud.ZkNodeProps;
import org.apache.solr.common.params.CollectionAdminParams;
import org.apache.solr.common.params.CoreAdminParams;
import org.apache.solr.common.util.NamedList;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/** */
public class RenameCmd implements CollApiCmds.CollectionApiCommand {
  private static final Logger log = LoggerFactory.getLogger(MethodHandles.lookup().lookupClass());

  private final CollectionCommandContext ccc;

  public RenameCmd(CollectionCommandContext ccc) {
    this.ccc = ccc;
  }

  @Override
  public void call(ClusterState state, ZkNodeProps message, NamedList results)
      throws Exception {
    String extCollectionName = message.getStr(CoreAdminParams.NAME);
    String target = message.getStr(CollectionAdminParams.TARGET);

    if (ccc.getZkStateReader().aliasesManager != null) { // not a mock ZkStateReader
      ccc.getZkStateReader().aliasesManager.update();
    }

    if (extCollectionName == null || target == null) {
      throw new SolrException(
          SolrException.ErrorCode.BAD_REQUEST,
          "both collection 'name' and 'target' name must be specified");
    }
    Aliases aliases = ccc.getZkStateReader().getAliases();

    boolean followAliases = message.getBool(FOLLOW_ALIASES, false);
    String collectionName;
    if (followAliases) {
      collectionName = aliases.resolveSimpleAlias(extCollectionName);
    } else {
      collectionName = extCollectionName;
    }
    if (!state.hasCollection(collectionName)) {
      throw new SolrException(
          SolrException.ErrorCode.BAD_REQUEST,
          "source collection '" + collectionName + "' not found.");
    }
    if (ccc.getZkStateReader().getAliases().hasAlias(target)) {
      throw new SolrException(
          SolrException.ErrorCode.BAD_REQUEST,
          "target alias '"
              + target
              + "' exists: "
              + ccc.getZkStateReader().getAliases().getCollectionAliasListMap().get(target));
    }

    ccc.getZkStateReader()
        .aliasesManager
        .applyModificationAndExportToZk(a -> a.cloneWithRename(extCollectionName, target));
  }
}