/*
 * 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.RoutingTable;
import org.elasticsearch.cluster.routing.allocation.decider.ClusterRebalanceAllocationDecider;
import org.elasticsearch.common.settings.Settings;

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

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

    public void testSimple() {
        AllocationService strategy = createAllocationService(
            Settings.builder()
                .put(
                    ClusterRebalanceAllocationDecider.CLUSTER_ROUTING_ALLOCATION_ALLOW_REBALANCE_SETTING.getKey(),
                    ClusterRebalanceAllocationDecider.ClusterRebalanceType.ALWAYS.toString()
                )
                .build()
        );

        Metadata metadata = Metadata.builder()
            .put(IndexMetadata.builder("test1").settings(settings(Version.CURRENT)).numberOfShards(1).numberOfReplicas(1))
            .put(IndexMetadata.builder("test2").settings(settings(Version.CURRENT)).numberOfShards(1).numberOfReplicas(1))
            .build();

        RoutingTable routingTable = RoutingTable.builder(TestShardRoutingRoleStrategies.DEFAULT_ROLE_ONLY)
            .addAsNew(metadata.index("test1"))
            .addAsNew(metadata.index("test2"))
            .build();

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

        logger.info("start two nodes");
        clusterState = ClusterState.builder(clusterState)
            .nodes(DiscoveryNodes.builder().add(newNode("node1")).add(newNode("node2")))
            .build();
        routingTable = strategy.reroute(clusterState, "reroute", ActionListener.noop()).routingTable();
        clusterState = ClusterState.builder(clusterState).routingTable(routingTable).build();

        for (int i = 0; i < routingTable.index("test1").size(); i++) {
            assertThat(routingTable.index("test1").shard(i).size(), equalTo(2));
            assertThat(routingTable.index("test1").shard(i).primaryShard().state(), equalTo(INITIALIZING));
            assertThat(routingTable.index("test1").shard(i).replicaShards().get(0).state(), equalTo(UNASSIGNED));
        }

        for (int i = 0; i < routingTable.index("test2").size(); i++) {
            assertThat(routingTable.index("test2").shard(i).size(), equalTo(2));
            assertThat(routingTable.index("test2").shard(i).primaryShard().state(), equalTo(INITIALIZING));
            assertThat(routingTable.index("test2").shard(i).replicaShards().get(0).state(), equalTo(UNASSIGNED));
        }

        logger.info("start all the primary shards for test1, replicas will start initializing");
        routingTable = startInitializingShardsAndReroute(strategy, clusterState, "test1").routingTable();

        for (int i = 0; i < routingTable.index("test1").size(); i++) {
            assertThat(routingTable.index("test1").shard(i).size(), equalTo(2));
            assertThat(routingTable.index("test1").shard(i).primaryShard().state(), equalTo(STARTED));
            assertThat(routingTable.index("test1").shard(i).replicaShards().get(0).state(), equalTo(INITIALIZING));
        }

        for (int i = 0; i < routingTable.index("test2").size(); i++) {
            assertThat(routingTable.index("test2").shard(i).size(), equalTo(2));
            assertThat(routingTable.index("test2").shard(i).primaryShard().state(), equalTo(INITIALIZING));
            assertThat(routingTable.index("test2").shard(i).replicaShards().get(0).state(), equalTo(UNASSIGNED));
        }
    }
}
