/*
 * 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; you may not use this file except in compliance with the Elastic License
 * 2.0.
 */
package org.elasticsearch.xpack.searchablesnapshots.rest;

import org.elasticsearch.action.ClusterStatsLevel;
import org.elasticsearch.client.internal.node.NodeClient;
import org.elasticsearch.common.Strings;
import org.elasticsearch.rest.BaseRestHandler;
import org.elasticsearch.rest.RestRequest;
import org.elasticsearch.rest.action.RestToXContentListener;
import org.elasticsearch.xpack.searchablesnapshots.action.SearchableSnapshotsStatsAction;
import org.elasticsearch.xpack.searchablesnapshots.action.SearchableSnapshotsStatsRequest;

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

import static org.elasticsearch.rest.RestRequest.Method.GET;

public class RestSearchableSnapshotsStatsAction extends BaseRestHandler {

    @Override
    public List<Route> routes() {
        return List.of(new Route(GET, "/_searchable_snapshots/stats"), new Route(GET, "/{index}/_searchable_snapshots/stats"));
    }

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

    @Override
    public RestChannelConsumer prepareRequest(final RestRequest restRequest, final NodeClient client) {
        String[] indices = Strings.splitStringByCommaToArray(restRequest.param("index"));
        SearchableSnapshotsStatsRequest statsRequest = new SearchableSnapshotsStatsRequest(indices);
        // level parameter validation
        ClusterStatsLevel.of(restRequest, ClusterStatsLevel.INDICES);

        return channel -> client.execute(SearchableSnapshotsStatsAction.INSTANCE, statsRequest, new RestToXContentListener<>(channel));
    }

    private static final Set<String> RESPONSE_PARAMS = Collections.singleton("level");

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