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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.ingest.common;

import org.elasticsearch.action.support.WriteRequest;
import org.elasticsearch.common.bytes.BytesArray;
import org.elasticsearch.common.bytes.BytesReference;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.common.xcontent.XContentType;
import org.elasticsearch.plugins.Plugin;
import org.elasticsearch.script.MockScriptEngine;
import org.elasticsearch.script.MockScriptPlugin;
import org.elasticsearch.test.ESIntegTestCase;
import org.elasticsearch.test.InternalTestCluster;

import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.Map;
import java.util.function.Function;

import static org.hamcrest.Matchers.equalTo;

// Ideally I like this test to live in the server module, but otherwise a large part of the ScriptProcessor
// ends up being copied into this test.
@ESIntegTestCase.ClusterScope(numDataNodes = 0, numClientNodes = 0, scope = ESIntegTestCase.Scope.TEST)
public class IngestRestartIT extends ESIntegTestCase {

    @Override
    protected Collection<Class<? extends Plugin>> nodePlugins() {
        return Arrays.asList(IngestCommonPlugin.class, CustomScriptPlugin.class);
    }

    @Override
    protected boolean ignoreExternalCluster() {
        return true;
    }

    public static class CustomScriptPlugin extends MockScriptPlugin {
        @Override
        protected Map<String, Function<Map<String, Object>, Object>> pluginScripts() {
            return Collections.singletonMap("my_script", script -> {
                @SuppressWarnings("unchecked")
                Map<String, Object> ctx = (Map) script.get("ctx");
                ctx.put("z", 0);
                return null;
            });
        }
    }

    public void testPipelineWithScriptProcessorThatHasStoredScript() throws Exception {
        internalCluster().startNode();

        client().admin().cluster().preparePutStoredScript()
                .setId("1")
                .setContent(new BytesArray("{\"script\": {\"lang\": \"" + MockScriptEngine.NAME +
                        "\", \"source\": \"my_script\"} }"), XContentType.JSON)
                .get();
        BytesReference pipeline = new BytesArray("{\n" +
                "  \"processors\" : [\n" +
                "      {\"set\" : {\"field\": \"y\", \"value\": 0}},\n" +
                "      {\"script\" : {\"id\": \"1\"}}\n" +
                "  ]\n" +
                "}");
        client().admin().cluster().preparePutPipeline("_id", pipeline, XContentType.JSON).get();

        client().prepareIndex("index", "doc", "1")
                .setSource("x", 0)
                .setPipeline("_id")
                .setRefreshPolicy(WriteRequest.RefreshPolicy.IMMEDIATE)
                .get();

        Map<String, Object> source = client().prepareGet("index", "doc", "1").get().getSource();
        assertThat(source.get("x"), equalTo(0));
        assertThat(source.get("y"), equalTo(0));
        assertThat(source.get("z"), equalTo(0));

        // Prior to making this ScriptService implement ClusterStateApplier instead of ClusterStateListener,
        // pipelines with a script processor failed to load causing these pipelines and pipelines that were
        // supposed to load after these pipelines to not be available during ingestion, which then causes
        // the next index request in this test to fail.
        internalCluster().fullRestart();
        ensureYellow("index");

        client().prepareIndex("index", "doc", "2")
                .setSource("x", 0)
                .setPipeline("_id")
                .setRefreshPolicy(WriteRequest.RefreshPolicy.IMMEDIATE)
                .get();

        source = client().prepareGet("index", "doc", "2").get().getSource();
        assertThat(source.get("x"), equalTo(0));
        assertThat(source.get("y"), equalTo(0));
        assertThat(source.get("z"), equalTo(0));
    }

    public void testWithDedicatedIngestNode() throws Exception {
        String node = internalCluster().startNode();
        String ingestNode = internalCluster().startNode(Settings.builder()
                .put("node.master", false)
                .put("node.data", false)
        );

        BytesReference pipeline = new BytesArray("{\n" +
                "  \"processors\" : [\n" +
                "      {\"set\" : {\"field\": \"y\", \"value\": 0}}\n" +
                "  ]\n" +
                "}");
        client().admin().cluster().preparePutPipeline("_id", pipeline, XContentType.JSON).get();

        client().prepareIndex("index", "doc", "1")
                .setSource("x", 0)
                .setPipeline("_id")
                .setRefreshPolicy(WriteRequest.RefreshPolicy.IMMEDIATE)
                .get();

        Map<String, Object> source = client().prepareGet("index", "doc", "1").get().getSource();
        assertThat(source.get("x"), equalTo(0));
        assertThat(source.get("y"), equalTo(0));

        logger.info("Stopping");
        internalCluster().restartNode(node, new InternalTestCluster.RestartCallback());

        client(ingestNode).prepareIndex("index", "doc", "2")
                .setSource("x", 0)
                .setPipeline("_id")
                .setRefreshPolicy(WriteRequest.RefreshPolicy.IMMEDIATE)
                .get();

        source = client(ingestNode).prepareGet("index", "doc", "2").get().getSource();
        assertThat(source.get("x"), equalTo(0));
        assertThat(source.get("y"), equalTo(0));
    }

}
