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/*
 * 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 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 or the Server
 * Side Public License, v 1.
 */

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

import org.elasticsearch.action.admin.cluster.node.tasks.cancel.CancelTasksRequest;
import org.elasticsearch.client.node.NodeClient;
import org.elasticsearch.cluster.node.DiscoveryNodes;
import org.elasticsearch.common.Strings;
import org.elasticsearch.rest.BaseRestHandler;
import org.elasticsearch.rest.RestRequest;
import org.elasticsearch.tasks.TaskId;

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

import static java.util.Arrays.asList;
import static java.util.Collections.unmodifiableList;
import static org.elasticsearch.rest.RestRequest.Method.POST;
import static org.elasticsearch.rest.action.admin.cluster.RestListTasksAction.listTasksResponseListener;

public class RestCancelTasksAction extends BaseRestHandler {
    private final Supplier nodesInCluster;

    public RestCancelTasksAction(Supplier nodesInCluster) {
        this.nodesInCluster = nodesInCluster;
    }

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

    @Override
    public List routes() {
        return unmodifiableList(asList(new Route(POST, "/_tasks/_cancel"), new Route(POST, "/_tasks/{task_id}/_cancel")));
    }

    @Override
    public RestChannelConsumer prepareRequest(final RestRequest request, final NodeClient client) throws IOException {
        final String[] nodesIds = Strings.splitStringByCommaToArray(request.param("nodes"));
        final TaskId taskId = new TaskId(request.param("task_id"));
        final String[] actions = Strings.splitStringByCommaToArray(request.param("actions"));
        final TaskId parentTaskId = new TaskId(request.param("parent_task_id"));
        final String groupBy = request.param("group_by", "nodes");

        CancelTasksRequest cancelTasksRequest = new CancelTasksRequest();
        cancelTasksRequest.setTaskId(taskId);
        cancelTasksRequest.setNodes(nodesIds);
        cancelTasksRequest.setActions(actions);
        cancelTasksRequest.setParentTaskId(parentTaskId);
        cancelTasksRequest.setWaitForCompletion(request.paramAsBoolean("wait_for_completion", cancelTasksRequest.waitForCompletion()));
        return channel -> client.admin()
            .cluster()
            .cancelTasks(cancelTasksRequest, listTasksResponseListener(nodesInCluster, groupBy, channel));
    }

    @Override
    public boolean canTripCircuitBreaker() {
        return false;
    }

}