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

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.DeprecationCategory;
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.RestRequest;
import org.elasticsearch.rest.RestStatus;
import org.elasticsearch.rest.action.RestToXContentListener;

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

import static java.util.Arrays.asList;
import static java.util.Collections.unmodifiableList;
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 RESPONSE_PARAMETERS = Collections.unmodifiableSet(
        Sets.union(Collections.singleton(INCLUDE_TYPE_NAME_PARAMETER), Settings.FORMAT_PARAMS)
    );
    private static final DeprecationLogger deprecationLogger = DeprecationLogger.getLogger(RestGetIndexTemplateAction.class);
    public static final String TYPES_DEPRECATION_MESSAGE = "[types removal]"
        + " Specifying include_type_name in get index template requests is deprecated.";

    @Override
    public List routes() {
        return unmodifiableList(
            asList(new Route(GET, "/_template"), new Route(GET, "/_template/{name}"), new Route(HEAD, "/_template/{name}"))
        );
    }

    @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.hasParam(INCLUDE_TYPE_NAME_PARAMETER)) {
            deprecationLogger.critical(DeprecationCategory.TYPES, "get_index_template_include_type_name", 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(channel) {
                @Override
                protected RestStatus getStatus(final GetIndexTemplatesResponse response) {
                    final boolean templateExists = response.getIndexTemplates().isEmpty() == false;
                    return (templateExists || implicitAll) ? OK : NOT_FOUND;
                }
            });
    }

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

}