/*
 * 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.transform.rest.action;

import org.elasticsearch.action.support.master.AcknowledgedRequest;
import org.elasticsearch.client.internal.Client;
import org.elasticsearch.client.internal.node.NodeClient;
import org.elasticsearch.core.TimeValue;
import org.elasticsearch.rest.BaseRestHandler;
import org.elasticsearch.rest.RestRequest;
import org.elasticsearch.rest.Scope;
import org.elasticsearch.rest.ServerlessScope;
import org.elasticsearch.rest.action.RestCancellableNodeClient;
import org.elasticsearch.rest.action.RestToXContentListener;
import org.elasticsearch.xpack.core.action.util.PageParams;
import org.elasticsearch.xpack.core.transform.TransformField;
import org.elasticsearch.xpack.core.transform.action.GetTransformStatsAction;

import java.util.List;

import static org.elasticsearch.rest.RestRequest.Method.GET;
import static org.elasticsearch.xpack.core.transform.TransformField.ALLOW_NO_MATCH;

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

    @Override
    public List<Route> routes() {
        return List.of(
            new Route(GET, TransformField.REST_BASE_PATH_TRANSFORMS + "_stats"),
            new Route(GET, TransformField.REST_BASE_PATH_TRANSFORMS_BY_ID + "_stats")
        );
    }

    @Override
    protected RestChannelConsumer prepareRequest(RestRequest restRequest, NodeClient nodeClient) {
        String id = restRequest.param(TransformField.ID.getPreferredName());
        TimeValue timeout = restRequest.paramAsTime(TransformField.TIMEOUT.getPreferredName(), AcknowledgedRequest.DEFAULT_ACK_TIMEOUT);
        GetTransformStatsAction.Request request = new GetTransformStatsAction.Request(id, timeout);
        request.setAllowNoMatch(restRequest.paramAsBoolean(ALLOW_NO_MATCH.getPreferredName(), true));
        if (restRequest.hasParam(PageParams.FROM.getPreferredName()) || restRequest.hasParam(PageParams.SIZE.getPreferredName())) {
            request.setPageParams(
                new PageParams(
                    restRequest.paramAsInt(PageParams.FROM.getPreferredName(), PageParams.DEFAULT_FROM),
                    restRequest.paramAsInt(PageParams.SIZE.getPreferredName(), PageParams.DEFAULT_SIZE)
                )
            );
        }
        Client client = new RestCancellableNodeClient(nodeClient, restRequest.getHttpChannel());
        return channel -> client.execute(GetTransformStatsAction.INSTANCE, request, new RestToXContentListener<>(channel));
    }

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