/*
 * 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", the "GNU Affero General Public License v3.0 only", 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", the "GNU Affero General Public
 * License v3.0 only", or the "Server Side Public License, v 1".
 */

package org.elasticsearch.rest.action.admin.indices;

import org.elasticsearch.action.admin.indices.settings.get.GetSettingsRequest;
import org.elasticsearch.action.support.IndicesOptions;
import org.elasticsearch.client.internal.node.NodeClient;
import org.elasticsearch.common.Strings;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.rest.BaseRestHandler;
import org.elasticsearch.rest.RestRequest;
import org.elasticsearch.rest.RestUtils;
import org.elasticsearch.rest.Scope;
import org.elasticsearch.rest.ServerlessScope;
import org.elasticsearch.rest.action.RestCancellableNodeClient;
import org.elasticsearch.rest.action.RestRefCountedChunkedToXContentListener;

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

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

@ServerlessScope(Scope.PUBLIC)
public class RestGetSettingsAction extends BaseRestHandler {

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

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

    @Override
    public RestChannelConsumer prepareRequest(final RestRequest request, final NodeClient client) throws IOException {
        final String[] names = request.paramAsStringArrayOrEmptyIfAll("name");
        final boolean renderDefaults = request.paramAsBoolean("include_defaults", false);
        // This is required so the "flat_settings" parameter counts as consumed
        request.paramAsBoolean(Settings.FLAT_SETTINGS_PARAM, false);
        GetSettingsRequest getSettingsRequest = new GetSettingsRequest(RestUtils.getMasterNodeTimeout(request)).indices(
            Strings.splitStringByCommaToArray(request.param("index"))
        )
            .indicesOptions(IndicesOptions.fromRequest(request, IndicesOptions.strictExpandOpen()))
            .humanReadable(request.hasParam("human"))
            .includeDefaults(renderDefaults)
            .names(names);
        RestUtils.consumeDeprecatedLocalParameter(request);
        return channel -> new RestCancellableNodeClient(client, request.getHttpChannel()).admin()
            .indices()
            .getSettings(getSettingsRequest, new RestRefCountedChunkedToXContentListener<>(channel));
    }
}