/*
 * 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.cassandra.tools.nodetool.stats;

import java.io.PrintStream;
import java.util.HashMap;
import java.util.Map;

public class TpStatsPrinter
{
    public static StatsPrinter from(String format)
    {
        switch (format)
        {
            case "json":
                return new StatsPrinter.JsonPrinter();
            case "yaml":
                return new StatsPrinter.YamlPrinter();
            default:
                return new DefaultPrinter();
        }

    }

    public static class DefaultPrinter implements StatsPrinter<TpStatsHolder>
    {
        @Override
        public void print(TpStatsHolder data, PrintStream out)
        {
            Map<String, Object> convertData = data.convert2Map();

            out.printf("%-30s%10s%10s%15s%10s%18s%n", "Pool Name", "Active", "Pending", "Completed", "Blocked", "All time blocked");

            Map<Object, Object> threadPools = convertData.get("ThreadPools") instanceof HashMap<?, ?> ? (HashMap)convertData.get("ThreadPools") : new HashMap();
            for (Map.Entry<Object, Object> entry : threadPools.entrySet())
            {
                HashMap values = entry.getValue() instanceof HashMap<?, ?> ? (HashMap)entry.getValue() : new HashMap();
                out.printf("%-30s%10s%10s%15s%10s%18s%n",
                           entry.getKey(),
                           values.get("ActiveTasks"),
                           values.get("PendingTasks"),
                           values.get("CompletedTasks"),
                           values.get("CurrentlyBlockedTasks"),
                           values.get("TotalBlockedTasks"));
            }

            out.printf("%n%-20s%10s%n", "Message type", "Dropped");

            Map<Object, Object> droppedMessages = convertData.get("DroppedMessage") instanceof HashMap<?, ?> ? (HashMap)convertData.get("DroppedMessage") : new HashMap();
            for (Map.Entry<Object, Object> entry : droppedMessages.entrySet())
            {
                out.printf("%-20s%10s%n", entry.getKey(), entry.getValue());
            }
        }
    }
}

@@ -880,16 +880,46 @@
 Stream;%0A
+import java.util.Collections;%0A
 import j
@@ -1780,36 +1780,32 @@
 ls%22) instanceof 
-Hash
 Map%3C?, ?%3E ? (Has
@@ -1793,36 +1793,32 @@
 of Map%3C?, ?%3E ? (
-Hash
 Map)convertData.
@@ -1834,32 +1834,41 @@
 adPools%22) : 
-new Hash
+Collections.empty
 Map();%0A     
@@ -1967,20 +1967,16 @@
         
-Hash
 Map valu
@@ -2000,36 +2000,32 @@
 ue() instanceof 
-Hash
 Map%3C?, ?%3E ? (Has
@@ -2017,28 +2017,24 @@
 ap%3C?, ?%3E ? (
-Hash
 Map)entry.ge
@@ -2040,32 +2040,41 @@
 etValue() : 
-new Hash
+Collections.empty
 Map();%0A     
@@ -2639,20 +2639,16 @@
 tanceof 
-Hash
 Map%3C?, ?
@@ -2652,20 +2652,16 @@
 , ?%3E ? (
-Hash
 Map)conv
@@ -2696,16 +2696,25 @@
 ) : 
-new Hash
+Collections.empty
 Map(

use Collections.emptyMap() to more clearly document that that case is a no-op operation