/*
 * SPDX-License-Identifier: Apache-2.0
 *
 * The OpenSearch Contributors require contributions made to
 * this file be licensed under the Apache-2.0 license or a
 * compatible open source license.
 */

/*
 * Licensed to Elasticsearch under one or more contributor
 * license agreements. See the NOTICE file distributed with
 * this work for additional information regarding copyright
 * ownership. Elasticsearch licenses this file to you under
 * the Apache License, Version 2.0 (the "License"); you may
 * not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
/*
 * Modifications Copyright OpenSearch Contributors. See
 * GitHub history for details.
 */

package org.opensearch.action.admin.indices.template.get;

import org.opensearch.action.ActionRequestValidationException;
import org.opensearch.action.support.clustermanager.ClusterManagerNodeReadRequest;
import org.opensearch.common.annotation.PublicApi;
import org.opensearch.core.common.Strings;
import org.opensearch.core.common.io.stream.StreamInput;
import org.opensearch.core.common.io.stream.StreamOutput;

import java.io.IOException;

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

/**
 * Request that allows to retrieve index templates
 *
 * @opensearch.api
 */
@PublicApi(since = "1.0.0")
public class GetIndexTemplatesRequest extends ClusterManagerNodeReadRequest<GetIndexTemplatesRequest> {

    private String[] names;

    public GetIndexTemplatesRequest() {}

    public GetIndexTemplatesRequest(String... names) {
        this.names = names;
    }

    public GetIndexTemplatesRequest(StreamInput in) throws IOException {
        super(in);
        names = in.readStringArray();
    }

    @Override
    public void writeTo(StreamOutput out) throws IOException {
        super.writeTo(out);
        out.writeStringArray(names);
    }

    @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)) {
                    validationException = addValidationError("name is missing", validationException);
                }
            }
        }
        return validationException;
    }

    /**
     * Sets the names of the index templates.
     */
    public GetIndexTemplatesRequest names(String... names) {
        this.names = names;
        return this;
    }

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