/*
 * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
 * or more contributor license agreements. Licensed under the Elastic License
 * 2.0 and the Server Side Public License, v 1; you may not use this file except
 * in compliance with, at your election, the Elastic License 2.0 or the Server
 * Side Public License, v 1.
 */

package org.elasticsearch.cluster.routing.allocation;

import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.elasticsearch.Version;
import org.elasticsearch.action.ActionListener;
import org.elasticsearch.cluster.ClusterName;
import org.elasticsearch.cluster.ClusterState;
import org.elasticsearch.cluster.ESAllocationTestCase;
import org.elasticsearch.cluster.TestShardRoutingRoleStrategies;
import org.elasticsearch.cluster.metadata.IndexMetadata;
import org.elasticsearch.cluster.metadata.Metadata;
import org.elasticsearch.cluster.node.DiscoveryNodes;
import org.elasticsearch.cluster.routing.RoutingNodes;
import org.elasticsearch.cluster.routing.RoutingTable;
import org.elasticsearch.common.settings.Settings;

import static org.elasticsearch.cluster.routing.RoutingNodesHelper.shardsWithState;
import static org.elasticsearch.cluster.routing.ShardRoutingState.INITIALIZING;
import static org.elasticsearch.cluster.routing.ShardRoutingState.STARTED;
import static org.hamcrest.Matchers.equalTo;

public class PrimaryNotRelocatedWhileBeingRecoveredTests extends ESAllocationTestCase {
    private final Logger logger = LogManager.getLogger(PrimaryNotRelocatedWhileBeingRecoveredTests.class);

    public void testPrimaryNotRelocatedWhileBeingRecoveredFrom() {
        AllocationService strategy = createAllocationService(
            Settings.builder()
                .put("cluster.routing.allocation.node_concurrent_recoveries", 10)
                .put("cluster.routing.allocation.concurrent_source_recoveries", 10)
                .put("cluster.routing.allocation.node_initial_primaries_recoveries", 10)
                .build()
        );

        logger.info("Building initial routing table");

        Metadata metadata = Metadata.builder()
            .put(IndexMetadata.builder("test").settings(settings(Version.CURRENT)).numberOfShards(5).numberOfReplicas(1))
            .build();

        RoutingTable initialRoutingTable = RoutingTable.builder(TestShardRoutingRoleStrategies.DEFAULT_ROLE_ONLY)
            .addAsNew(metadata.index("test"))
            .build();

        ClusterState clusterState = ClusterState.builder(ClusterName.DEFAULT).metadata(metadata).routingTable(initialRoutingTable).build();

        logger.info("Adding two nodes and performing rerouting");
        clusterState = ClusterState.builder(clusterState).nodes(DiscoveryNodes.builder().add(newNode("node1"))).build();
        clusterState = strategy.reroute(clusterState, "reroute", ActionListener.noop());

        logger.info("Start the primary shard (on node1)");
        RoutingNodes routingNodes = clusterState.getRoutingNodes();
        clusterState = startInitializingShardsAndReroute(strategy, clusterState, routingNodes.node("node1"));

        assertThat(shardsWithState(clusterState.getRoutingNodes(), STARTED).size(), equalTo(5));

        logger.info("start another node, replica will start recovering form primary");
        clusterState = ClusterState.builder(clusterState).nodes(DiscoveryNodes.builder(clusterState.nodes()).add(newNode("node2"))).build();
        clusterState = strategy.reroute(clusterState, "reroute", ActionListener.noop());

        assertThat(shardsWithState(clusterState.getRoutingNodes(), STARTED).size(), equalTo(5));
        assertThat(shardsWithState(clusterState.getRoutingNodes(), INITIALIZING).size(), equalTo(5));

        logger.info("start another node, make sure the primary is not relocated");
        clusterState = ClusterState.builder(clusterState).nodes(DiscoveryNodes.builder(clusterState.nodes()).add(newNode("node3"))).build();
        clusterState = strategy.reroute(clusterState, "reroute", ActionListener.noop());

        assertThat(shardsWithState(clusterState.getRoutingNodes(), STARTED).size(), equalTo(5));
        assertThat(shardsWithState(clusterState.getRoutingNodes(), INITIALIZING).size(), equalTo(5));
    }
}
