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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.distributed.shared;

import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.UnknownHostException;
import java.util.HashMap;
import java.util.Map;
import java.util.Objects;
import java.util.function.IntFunction;
import java.util.stream.Collectors;
import java.util.stream.IntStream;

public class NetworkTopology
{
    private final Map map;

    public static class DcAndRack
    {
        public final String dc;
        public final String rack;

        private DcAndRack(String dc, String rack)
        {
            this.dc = dc;
            this.rack = rack;
        }

        @Override
        public String toString()
        {
            return "DcAndRack{" +
                   "dc='" + dc + '\'' +
                   ", rack='" + rack + '\'' +
                   '}';
        }

        @Override
        public boolean equals(Object o)
        {
            if (this == o) return true;
            if (o == null || getClass() != o.getClass()) return false;
            DcAndRack dcAndRack = (DcAndRack) o;
            return Objects.equals(dc, dcAndRack.dc) &&
                   Objects.equals(rack, dcAndRack.rack);
        }

        @Override
        public int hashCode()
        {
            return Objects.hash(dc, rack);
        }
    }

    public static DcAndRack dcAndRack(String dc, String rack)
    {
        return new DcAndRack(dc, rack);
    }

    public static InetSocketAddress addressAndPort(InetAddress address, int port)
    {
        return new InetSocketAddress(address, port);
    }

    public static InetSocketAddress addressAndPort(String address, int port)
    {
        try
        {
            return new InetSocketAddress(InetAddress.getByName(address), port);
        }
        catch (UnknownHostException e)
        {
            throw new IllegalArgumentException("Unknown address '" + address + '\'');
        }
    }

    private NetworkTopology()
    {
        map = new HashMap<>();
    }

    @SuppressWarnings("WeakerAccess")
    public NetworkTopology(NetworkTopology networkTopology)
    {
        map = new HashMap<>(networkTopology.map);
    }

    public static NetworkTopology build(String ipPrefix, int broadcastPort, Map nodeIdTopology)
    {
        final NetworkTopology topology = new NetworkTopology();

        for (int nodeId = 1; nodeId <= nodeIdTopology.size(); nodeId++)
        {
            String broadcastAddress = ipPrefix + nodeId;

            DcAndRack dcAndRack = nodeIdTopology.get(nodeId);
            if (dcAndRack == null)
                throw new IllegalStateException("nodeId " + nodeId + "not found in instanceMap");

            topology.put(addressAndPort(broadcastAddress, broadcastPort), dcAndRack);
        }
        return topology;
    }

    public DcAndRack put(InetSocketAddress addressAndPort, DcAndRack value)
    {
        return map.put(addressAndPort, value);
    }

    public String localRack(InetSocketAddress key)
    {
        DcAndRack p = map.get(key);
        if (p == null)
            return null;
        return p.rack;
    }

    public String localDC(InetSocketAddress key)
    {
        DcAndRack p = map.get(key);
        if (p == null)
            return null;
        return p.dc;
    }

    public boolean contains(InetSocketAddress key)
    {
        return map.containsKey(key);
    }

    public String toString()
    {
        return "NetworkTopology{" + map + '}';
    }


    public static Map singleDcNetworkTopology(int nodeCount,
                                                                                  String dc,
                                                                                  String rack)
    {
        return networkTopology(nodeCount, (nodeid) -> NetworkTopology.dcAndRack(dc, rack));
    }

    public static Map networkTopology(int nodeCount,
                                                                          IntFunction dcAndRackSupplier)
    {

        return IntStream.rangeClosed(1, nodeCount).boxed()
                        .collect(Collectors.toMap(nodeId -> nodeId,
                                                  dcAndRackSupplier::apply));
    }
}