/*
 * Licensed to Elasticsearch under one or more contributor
 * license agreements. See the NOTICE file distributed with
 * this work for additional information regarding copyright
 * ownership. Elasticsearch 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.elasticsearch.cluster.routing.allocation.decider;

import org.elasticsearch.cluster.ClusterState;
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.AllocationService;
import org.elasticsearch.common.logging.ESLogger;
import org.elasticsearch.common.logging.Loggers;
import org.elasticsearch.common.settings.ImmutableSettings;
import org.elasticsearch.test.ElasticsearchAllocationTestCase;
import org.junit.Test;

import static org.elasticsearch.cluster.routing.ShardRoutingState.INITIALIZING;
import static org.elasticsearch.cluster.routing.ShardRoutingState.STARTED;
import static org.elasticsearch.cluster.routing.allocation.decider.EnableAllocationDecider.*;
import static org.elasticsearch.common.settings.ImmutableSettings.settingsBuilder;
import static org.hamcrest.Matchers.equalTo;

/**
 */
public class EnableAllocationTests extends ElasticsearchAllocationTestCase {

    private final ESLogger logger = Loggers.getLogger(EnableAllocationTests.class);

    @Test
    public void testClusterEnableNone() {
        AllocationService strategy = createAllocationService(settingsBuilder()
                .put(CLUSTER_ROUTING_ALLOCATION_ENABLE, Allocation.NONE.name())
                .build());

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

        MetaData metaData = MetaData.builder()
                .put(IndexMetaData.builder("test").numberOfShards(1).numberOfReplicas(1))
                .build();

        RoutingTable routingTable = RoutingTable.builder()
                .addAsNew(metaData.index("test"))
                .build();

        ClusterState clusterState = ClusterState.builder().metaData(metaData).routingTable(routingTable).build();

        logger.info("--> adding two nodes and do rerouting");
        clusterState = ClusterState.builder(clusterState).nodes(DiscoveryNodes.builder()
                .put(newNode("node1"))
                .put(newNode("node2"))
        ).build();
        routingTable = strategy.reroute(clusterState).routingTable();
        clusterState = ClusterState.builder(clusterState).routingTable(routingTable).build();
        assertThat(clusterState.routingNodes().shardsWithState(INITIALIZING).size(), equalTo(0));

    }

    @Test
    public void testClusterEnableOnlyPrimaries() {
        AllocationService strategy = createAllocationService(settingsBuilder()
                .put(CLUSTER_ROUTING_ALLOCATION_ENABLE, Allocation.PRIMARIES.name())
                .build());

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

        MetaData metaData = MetaData.builder()
                .put(IndexMetaData.builder("test").numberOfShards(1).numberOfReplicas(1))
                .build();

        RoutingTable routingTable = RoutingTable.builder()
                .addAsNew(metaData.index("test"))
                .build();

        ClusterState clusterState = ClusterState.builder().metaData(metaData).routingTable(routingTable).build();

        logger.info("--> adding two nodes do rerouting");
        clusterState = ClusterState.builder(clusterState).nodes(DiscoveryNodes.builder()
                .put(newNode("node1"))
                .put(newNode("node2"))
        ).build();
        routingTable = strategy.reroute(clusterState).routingTable();
        clusterState = ClusterState.builder(clusterState).routingTable(routingTable).build();
        assertThat(clusterState.routingNodes().shardsWithState(INITIALIZING).size(), equalTo(1));

        logger.info("--> start the shards (primaries)");
        routingTable = strategy.applyStartedShards(clusterState, clusterState.routingNodes().shardsWithState(INITIALIZING)).routingTable();
        clusterState = ClusterState.builder(clusterState).routingTable(routingTable).build();

        assertThat(clusterState.routingNodes().shardsWithState(INITIALIZING).size(), equalTo(0));
    }

    @Test
    public void testIndexEnableNone() {
        AllocationService strategy = createAllocationService(settingsBuilder()
                .build());

        MetaData metaData = MetaData.builder()
                .put(IndexMetaData.builder("disabled").settings(ImmutableSettings.builder()
                        .put(INDEX_ROUTING_ALLOCATION_ENABLE, Allocation.NONE.name()))
                        .numberOfShards(1).numberOfReplicas(1))
                .put(IndexMetaData.builder("enabled").numberOfShards(1).numberOfReplicas(1))
                .build();

        RoutingTable routingTable = RoutingTable.builder()
                .addAsNew(metaData.index("disabled"))
                .addAsNew(metaData.index("enabled"))
                .build();

        ClusterState clusterState = ClusterState.builder().metaData(metaData).routingTable(routingTable).build();

        logger.info("--> adding two nodes and do rerouting");
        clusterState = ClusterState.builder(clusterState).nodes(DiscoveryNodes.builder()
                .put(newNode("node1"))
                .put(newNode("node2"))
        ).build();
        routingTable = strategy.reroute(clusterState).routingTable();
        clusterState = ClusterState.builder(clusterState).routingTable(routingTable).build();
        assertThat(clusterState.routingNodes().shardsWithState(INITIALIZING).size(), equalTo(1));
        logger.info("--> start the shards (primaries)");
        routingTable = strategy.applyStartedShards(clusterState, clusterState.routingNodes().shardsWithState(INITIALIZING)).routingTable();
        clusterState = ClusterState.builder(clusterState).routingTable(routingTable).build();
        logger.info("--> start the shards (replicas)");
        routingTable = strategy.applyStartedShards(clusterState, clusterState.routingNodes().shardsWithState(INITIALIZING)).routingTable();
        clusterState = ClusterState.builder(clusterState).routingTable(routingTable).build();

        logger.info("--> verify only enabled index has been routed");
        assertThat(clusterState.readOnlyRoutingNodes().shardsWithState("enabled", STARTED).size(), equalTo(2));
        assertThat(clusterState.readOnlyRoutingNodes().shardsWithState("disabled", STARTED).size(), equalTo(0));
    }

}
