/*
 * 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.ml.rest.filter;

import org.elasticsearch.client.internal.node.NodeClient;
import org.elasticsearch.common.Strings;
import org.elasticsearch.core.RestApiVersion;
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.RestStatusToXContentListener;
import org.elasticsearch.xpack.core.action.util.PageParams;
import org.elasticsearch.xpack.core.ml.action.GetFiltersAction;
import org.elasticsearch.xpack.core.ml.job.config.MlFilter;

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

import static org.elasticsearch.rest.RestRequest.Method.GET;
import static org.elasticsearch.xpack.ml.MachineLearning.BASE_PATH;
import static org.elasticsearch.xpack.ml.MachineLearning.PRE_V7_BASE_PATH;

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

    @Override
    public List<Route> routes() {
        return List.of(
            Route.builder(GET, BASE_PATH + "filters/{" + MlFilter.ID + "}")
                .replaces(GET, PRE_V7_BASE_PATH + "filters/{" + MlFilter.ID + "}", RestApiVersion.V_7)
                .build(),
            Route.builder(GET, BASE_PATH + "filters/").replaces(GET, PRE_V7_BASE_PATH + "filters/", RestApiVersion.V_7).build()
        );
    }

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

    @Override
    protected RestChannelConsumer prepareRequest(RestRequest restRequest, NodeClient client) throws IOException {
        GetFiltersAction.Request request = new GetFiltersAction.Request();
        String filterId = restRequest.param(MlFilter.ID.getPreferredName());
        if (Strings.isNullOrEmpty(filterId) == false) {
            request.setResourceId(filterId);
        }
        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)
                )
            );
        }
        return channel -> new RestCancellableNodeClient(client, restRequest.getHttpChannel()).execute(
            GetFiltersAction.INSTANCE,
            request,
            new RestStatusToXContentListener<>(channel)
        );
    }

}
