/*
 * 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.rest.action.admin.indices;

import org.apache.logging.log4j.LogManager;
import org.elasticsearch.action.admin.indices.template.get.GetIndexTemplatesRequest;
import org.elasticsearch.action.admin.indices.template.get.GetIndexTemplatesResponse;
import org.elasticsearch.client.node.NodeClient;
import org.elasticsearch.common.Strings;
import org.elasticsearch.common.logging.DeprecationLogger;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.common.util.set.Sets;
import org.elasticsearch.rest.BaseRestHandler;
import org.elasticsearch.rest.RestController;
import org.elasticsearch.rest.RestRequest;
import org.elasticsearch.rest.RestStatus;
import org.elasticsearch.rest.action.RestToXContentListener;

import java.io.IOException;
import java.util.Collections;
import java.util.Set;

import static org.elasticsearch.rest.RestRequest.Method.GET;
import static org.elasticsearch.rest.RestRequest.Method.HEAD;
import static org.elasticsearch.rest.RestStatus.NOT_FOUND;
import static org.elasticsearch.rest.RestStatus.OK;

/**
 * The REST handler for get template and head template APIs.
 */
public class RestGetIndexTemplateAction extends BaseRestHandler {

    private static final Set<String> RESPONSE_PARAMETERS = Collections.unmodifiableSet(Sets.union(
        Collections.singleton(INCLUDE_TYPE_NAME_PARAMETER), Settings.FORMAT_PARAMS));
    private static final DeprecationLogger deprecationLogger = new DeprecationLogger(
            LogManager.getLogger(RestGetIndexTemplateAction.class));
    public static final String TYPES_DEPRECATION_MESSAGE = "[types removal] The response format of get index template requests will change"
            + " in the next major version. Please start using the `include_type_name` parameter set to `false` in the request to "
            + "move to the new, typeless response format that will be the default in 7.0.";
    public RestGetIndexTemplateAction(final Settings settings, final RestController controller) {
        super(settings);
        controller.registerHandler(GET, "/_template", this);
        controller.registerHandler(GET, "/_template/{name}", this);
        controller.registerHandler(HEAD, "/_template/{name}", this);
    }

    @Override
    public String getName() {
        return "get_index_template_action";
    }

    @Override
    public RestChannelConsumer prepareRequest(final RestRequest request, final NodeClient client) throws IOException {
        final String[] names = Strings.splitStringByCommaToArray(request.param("name"));

        final GetIndexTemplatesRequest getIndexTemplatesRequest = new GetIndexTemplatesRequest(names);
        if (request.paramAsBoolean(INCLUDE_TYPE_NAME_PARAMETER, DEFAULT_INCLUDE_TYPE_NAME_POLICY)) {
            deprecationLogger.deprecatedAndMaybeLog("get_index_template_with_types", TYPES_DEPRECATION_MESSAGE);
        }
        getIndexTemplatesRequest.local(request.paramAsBoolean("local", getIndexTemplatesRequest.local()));
        getIndexTemplatesRequest.masterNodeTimeout(request.paramAsTime("master_timeout", getIndexTemplatesRequest.masterNodeTimeout()));

        final boolean implicitAll = getIndexTemplatesRequest.names().length == 0;

        return channel ->
                client.admin()
                        .indices()
                        .getTemplates(getIndexTemplatesRequest, new RestToXContentListener<GetIndexTemplatesResponse>(channel) {
                            @Override
                            protected RestStatus getStatus(final GetIndexTemplatesResponse response) {
                                final boolean templateExists = response.getIndexTemplates().isEmpty() == false;
                                return (templateExists || implicitAll) ? OK : NOT_FOUND;
                            }
                        });
    }

    @Override
    protected Set<String> responseParams() {
        return RESPONSE_PARAMETERS;
    }

}

@@ -2440,16 +2440,29 @@
 t index 
+%22 +%0A        %22
 template
@@ -2486,51 +2486,15 @@
 ange
-%22%0A            + %22 in the next major version
+ in 7.0
 . Pl
@@ -2514,17 +2514,16 @@
 ing the 
-%60
 include_
@@ -2531,17 +2531,16 @@
 ype_name
-%60
  paramet
@@ -2553,35 +2553,17 @@
  to 
-%60
 false
-%60 in the request to
  %22
+ +
 %0A   
@@ -2571,15 +2571,12 @@
     
-    + %22
+%22to 
 move
@@ -2625,16 +2625,20 @@
  will be
+come
  the def
@@ -2645,19 +2645,13 @@
 ault
- in 7.0
 .%22;%0A
+%0A
     

Make the 'get templates' types deprecation message consistent. (#38532)