/**
 * 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.blur.shell;

import java.io.PrintWriter;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.TreeMap;

import org.apache.blur.thirdparty.thrift_0_9_0.TException;
import org.apache.blur.thrift.generated.Blur.Iface;
import org.apache.blur.thrift.generated.BlurException;

public class ListSnapshotsCommand extends Command implements TableFirstArgCommand {

  @Override
  public void doit(PrintWriter out, Iface client, String[] args) throws CommandException, TException, BlurException {
    if (args.length != 2) {
      throw new CommandException("Invalid args: " + help());
    }
    String tablename = args[1];
    Map<String, List<String>> snapshotsPerShard = client.listSnapshots(tablename);
    Map<String, Long> snapshotCounts = new TreeMap<String, Long>();
    for (Entry<String, List<String>> entry : snapshotsPerShard.entrySet()) {
      for (String snapshot : entry.getValue()) {
        Long count = snapshotCounts.get(snapshot);
        if (count == null) {
          snapshotCounts.put(snapshot, 1L);
        } else {
          snapshotCounts.put(snapshot, count + 1L);
        }
      }
    }

    for (Entry<String, Long> e : snapshotCounts.entrySet()) {
      out.println(e.getKey() + " => shards:" + e.getValue());
    }

  }

  @Override
  public String description() {
    return "List the existing snapshots of a table";
  }

  @Override
  public String usage() {
    return "<tablename>";
  }

  @Override
  public String name() {
    return "list-snapshots";
  }

}