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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.cassandra.tools.nodetool;

import static java.lang.String.format;
import io.airlift.command.Command;

import java.io.PrintStream;
import java.net.InetAddress;
import java.net.UnknownHostException;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;

import javax.management.InstanceNotFoundException;

import com.google.common.collect.Lists;

import io.airlift.command.Option;
import org.apache.cassandra.locator.DynamicEndpointSnitch;
import org.apache.cassandra.locator.DynamicEndpointSnitchMBean;
import org.apache.cassandra.tools.NodeProbe;
import org.apache.cassandra.tools.NodeTool.NodeToolCmd;

@Command(name = "dynamicendpointsnitchstats", description = "Print the dynamic snitch configurations of a cluster and the current scores of all nodes")
public class DynamicEndpointSnitchStats extends NodeToolCmd
{

    @Option(title = "timings", name = { "-t", "--timings"}, description = "Use -t to additionally get a dump of timings for each node")
    private boolean timings = false;

    @Override
    public void execute(NodeProbe probe)
    {
        try
        {
            DynamicEndpointSnitchMBean dynamicSnitchProxy = probe.getDynamicEndpointSnitchProxy();
            printConfiguration(probe.output().out, dynamicSnitchProxy);
            // display snitch scores for each node
            probe.output().out.println("Dynamic Endpoint Snitch Scores:");
            Map snitchScores = dynamicSnitchProxy.getScores();
            for (InetAddress address : snitchScores.keySet())
            {
                probe.output().out.println(format("\t%s: %s", address.getCanonicalHostName(), snitchScores.get(address)));
            }
            if (timings) {
                printTimings(probe.output().out, dynamicSnitchProxy, snitchScores.keySet());
            }
        } catch (RuntimeException e) {
            if ((e.getCause() instanceof InstanceNotFoundException)) {
                probe.output().out.println("Error getting DynamicEndpointSnitch proxy--Dynamic snitch may not be enabled on this cluster.");
            }
        }
    }

    private void printConfiguration(PrintStream output, DynamicEndpointSnitchMBean dynamicSnitchProxy) {
        output.println("Dynamic Endpoint Snitch Configuration:");
        output.println("\tUpdate Interval (ms): " + dynamicSnitchProxy.getUpdateInterval());
        output.println("\tReset Interval (ms): " + dynamicSnitchProxy.getResetInterval());
        output.println("\tBadness Threshold: " + dynamicSnitchProxy.getBadnessThreshold());
        output.println("\tSubsnitch: " + dynamicSnitchProxy.getSubsnitchClassName());
        output.println("\tSeverity: " + dynamicSnitchProxy.getSeverity());
    }

    private void printTimings(PrintStream output, DynamicEndpointSnitchMBean dynamicEndpointSnitch, Set nodes) {
        output.println("Timings sent to Dynamic Snitch (ms): ");
        for (InetAddress address : nodes)
        {
            output.println(format("\t%s:", address.getCanonicalHostName()));
            try {
                List scores = dynamicEndpointSnitch.dumpTimings(address.getHostName());
                Map scoresToCounts = new HashMap<>();
                for (Double score : scores) {
                    if (!scoresToCounts.containsKey(score)) {
                        scoresToCounts.put(score, 0);
                    }
                    int prevCount = scoresToCounts.get(score);
                    scoresToCounts.put(score, prevCount + 1);
                }
                List sortedScores = Lists.newArrayList(scoresToCounts.keySet());
                Collections.sort(sortedScores);
                for (Double score : sortedScores) {
                    output.println(String.format("\t\t%f ms (%d occurrences)", score, scoresToCounts.get(score)));
                }
            } catch (UnknownHostException e) {
                output.println(String.format("Error getting timings for %s", address.getCanonicalHostName()));
            }

        }
    }
}