/*
 * 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.action.admin.indices.template.get;

import org.elasticsearch.action.ActionRequestValidationException;
import org.elasticsearch.action.support.local.LocalClusterStateRequest;
import org.elasticsearch.common.Strings;
import org.elasticsearch.common.io.stream.StreamInput;
import org.elasticsearch.core.TimeValue;
import org.elasticsearch.core.UpdateForV10;
import org.elasticsearch.tasks.CancellableTask;
import org.elasticsearch.tasks.Task;
import org.elasticsearch.tasks.TaskId;

import java.io.IOException;
import java.util.Map;

import static org.elasticsearch.action.ValidateActions.addValidationError;

/**
 * Request that allows to retrieve index templates
 */
public class GetIndexTemplatesRequest extends LocalClusterStateRequest {

    private final String[] names;

    public GetIndexTemplatesRequest(TimeValue masterTimeout, String... names) {
        super(masterTimeout);
        this.names = names;
    }

    /**
     * NB prior to 9.0 this was a TransportMasterNodeReadAction so for BwC we must remain able to read these requests until
     * we no longer need to support calling this action remotely.
     */
    @UpdateForV10(owner = UpdateForV10.Owner.DATA_MANAGEMENT)
    public GetIndexTemplatesRequest(StreamInput in) throws IOException {
        super(in);
        names = in.readStringArray();
    }

    @Override
    public ActionRequestValidationException validate() {
        ActionRequestValidationException validationException = null;
        if (names == null) {
            validationException = addValidationError("names is null or empty", validationException);
        } else {
            for (String name : names) {
                if (name == null || Strings.hasText(name) == false) {
                    validationException = addValidationError("name is missing", validationException);
                }
            }
        }
        return validationException;
    }

    @Override
    public Task createTask(long id, String type, String action, TaskId parentTaskId, Map<String, String> headers) {
        return new CancellableTask(id, type, action, "", parentTaskId, headers);
    }

    /**
     * The names of the index templates.
     */
    public String[] names() {
        return this.names;
    }
}