/*
 * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
 * or more contributor license agreements. Licensed under the Elastic License;
 * you may not use this file except in compliance with the Elastic License.
 */
package org.elasticsearch.xpack.ml.rest.modelsnapshots;

import org.elasticsearch.client.node.NodeClient;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.common.xcontent.XContentParser;
import org.elasticsearch.rest.BaseRestHandler;
import org.elasticsearch.rest.RestController;
import org.elasticsearch.rest.RestRequest;
import org.elasticsearch.rest.action.RestStatusToXContentListener;
import org.elasticsearch.xpack.ml.MachineLearning;
import org.elasticsearch.xpack.ml.action.RevertModelSnapshotAction;
import org.elasticsearch.xpack.ml.job.config.Job;

import java.io.IOException;

public class RestRevertModelSnapshotAction extends BaseRestHandler {

    private final boolean DELETE_INTERVENING_DEFAULT = false;

    public RestRevertModelSnapshotAction(Settings settings, RestController controller) {
        super(settings);
        controller.registerHandler(RestRequest.Method.POST,
                MachineLearning.BASE_PATH + "anomaly_detectors/{" + Job.ID.getPreferredName() + "}/model_snapshots/{" +
                        RevertModelSnapshotAction.Request.SNAPSHOT_ID.getPreferredName() + "}/_revert", this);
    }

    @Override
    protected RestChannelConsumer prepareRequest(RestRequest restRequest, NodeClient client) throws IOException {
        String jobId = restRequest.param(Job.ID.getPreferredName());
        String snapshotId = restRequest.param(RevertModelSnapshotAction.Request.SNAPSHOT_ID.getPreferredName());
        RevertModelSnapshotAction.Request request;
        if (restRequest.hasContentOrSourceParam()) {
            XContentParser parser = restRequest.contentOrSourceParamParser();
            request = RevertModelSnapshotAction.Request.parseRequest(jobId, snapshotId, parser);
        } else {
            request = new RevertModelSnapshotAction.Request(jobId, snapshotId);
            request.setDeleteInterveningResults(restRequest
                    .paramAsBoolean(RevertModelSnapshotAction.Request.DELETE_INTERVENING.getPreferredName(), DELETE_INTERVENING_DEFAULT));
        }
        return channel -> client.execute(RevertModelSnapshotAction.INSTANCE, request, new RestStatusToXContentListener<>(channel));
    }
}
