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 * 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.
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package org.elasticsearch.usage;

import org.elasticsearch.Version;
import org.elasticsearch.action.admin.cluster.node.usage.NodeUsage;
import org.elasticsearch.client.node.NodeClient;
import org.elasticsearch.cluster.node.DiscoveryNode;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.common.transport.TransportAddress;
import org.elasticsearch.rest.BaseRestHandler;
import org.elasticsearch.rest.RestRequest;
import org.elasticsearch.test.ESTestCase;
import org.elasticsearch.test.rest.FakeRestRequest;

import java.io.IOException;
import java.net.InetAddress;
import java.util.Map;

import static org.hamcrest.Matchers.equalTo;
import static org.hamcrest.Matchers.notNullValue;
import static org.hamcrest.Matchers.nullValue;
import static org.hamcrest.Matchers.sameInstance;

public class UsageServiceTests extends ESTestCase {

    public void testRestUsage() throws Exception {
        DiscoveryNode discoveryNode = new DiscoveryNode("foo", new TransportAddress(InetAddress.getByName("localhost"), 12345),
                Version.CURRENT);
        Settings settings = Settings.EMPTY;
        RestRequest restRequest = new FakeRestRequest();
        BaseRestHandler handlerA = new MockRestHandler("a", settings);
        BaseRestHandler handlerB = new MockRestHandler("b", settings);
        BaseRestHandler handlerC = new MockRestHandler("c", settings);
        BaseRestHandler handlerD = new MockRestHandler("d", settings);
        BaseRestHandler handlerE = new MockRestHandler("e", settings);
        BaseRestHandler handlerF = new MockRestHandler("f", settings);
        UsageService usageService = new UsageService(settings);
        usageService.addRestHandler(handlerA);
        usageService.addRestHandler(handlerB);
        usageService.addRestHandler(handlerC);
        usageService.addRestHandler(handlerD);
        usageService.addRestHandler(handlerE);
        usageService.addRestHandler(handlerF);
        handlerA.handleRequest(restRequest, null, null);
        handlerB.handleRequest(restRequest, null, null);
        handlerA.handleRequest(restRequest, null, null);
        handlerA.handleRequest(restRequest, null, null);
        handlerB.handleRequest(restRequest, null, null);
        handlerC.handleRequest(restRequest, null, null);
        handlerC.handleRequest(restRequest, null, null);
        handlerD.handleRequest(restRequest, null, null);
        handlerA.handleRequest(restRequest, null, null);
        handlerB.handleRequest(restRequest, null, null);
        handlerE.handleRequest(restRequest, null, null);
        handlerF.handleRequest(restRequest, null, null);
        handlerC.handleRequest(restRequest, null, null);
        handlerD.handleRequest(restRequest, null, null);
        NodeUsage usage = usageService.getUsageStats(discoveryNode, true);
        assertThat(usage.getNode(), sameInstance(discoveryNode));
        Map<String, Long> restUsage = usage.getRestUsage();
        assertThat(restUsage, notNullValue());
        assertThat(restUsage.size(), equalTo(6));
        assertThat(restUsage.get("a"), equalTo(4L));
        assertThat(restUsage.get("b"), equalTo(3L));
        assertThat(restUsage.get("c"), equalTo(3L));
        assertThat(restUsage.get("d"), equalTo(2L));
        assertThat(restUsage.get("e"), equalTo(1L));
        assertThat(restUsage.get("f"), equalTo(1L));

        usage = usageService.getUsageStats(discoveryNode, false);
        assertThat(usage.getNode(), sameInstance(discoveryNode));
        assertThat(usage.getRestUsage(), nullValue());
    }

    private class MockRestHandler extends BaseRestHandler {

        private String name;

        protected MockRestHandler(String name, Settings settings) {
            super(settings);
            this.name = name;
        }

        @Override
        public String getName() {
            return name;
        }

        @Override
        protected RestChannelConsumer prepareRequest(RestRequest request, NodeClient client) throws IOException {
            return channel -> {
            };
        }

    }

}
