/*
 * 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.
 */
package org.elasticsearch.action.admin.indices.template.delete;

import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.apache.logging.log4j.message.ParameterizedMessage;
import org.elasticsearch.action.ActionListener;
import org.elasticsearch.action.support.ActionFilters;
import org.elasticsearch.action.support.master.AcknowledgedResponse;
import org.elasticsearch.action.support.master.TransportMasterNodeAction;
import org.elasticsearch.cluster.ClusterState;
import org.elasticsearch.cluster.block.ClusterBlockException;
import org.elasticsearch.cluster.block.ClusterBlockLevel;
import org.elasticsearch.cluster.metadata.IndexNameExpressionResolver;
import org.elasticsearch.cluster.metadata.MetadataIndexTemplateService;
import org.elasticsearch.cluster.service.ClusterService;
import org.elasticsearch.common.inject.Inject;
import org.elasticsearch.common.io.stream.StreamInput;
import org.elasticsearch.threadpool.ThreadPool;
import org.elasticsearch.transport.TransportService;

import java.io.IOException;

/**
 * Delete index action.
 */
public class TransportDeleteIndexTemplateAction
        extends TransportMasterNodeAction<DeleteIndexTemplateRequest, AcknowledgedResponse> {

    private static final Logger logger = LogManager.getLogger(TransportDeleteIndexTemplateAction.class);

    private final MetadataIndexTemplateService indexTemplateService;

    @Inject
    public TransportDeleteIndexTemplateAction(TransportService transportService, ClusterService clusterService,
                                              ThreadPool threadPool, MetadataIndexTemplateService indexTemplateService,
                                              ActionFilters actionFilters, IndexNameExpressionResolver indexNameExpressionResolver) {
        super(DeleteIndexTemplateAction.NAME, transportService, clusterService, threadPool, actionFilters,
            DeleteIndexTemplateRequest::new, indexNameExpressionResolver);
        this.indexTemplateService = indexTemplateService;
    }

    @Override
    protected String executor() {
        // we go async right away
        return ThreadPool.Names.SAME;
    }

    @Override
    protected AcknowledgedResponse read(StreamInput in) throws IOException {
        return new AcknowledgedResponse(in);
    }

    @Override
    protected ClusterBlockException checkBlock(DeleteIndexTemplateRequest request, ClusterState state) {
        return state.blocks().globalBlockedException(ClusterBlockLevel.METADATA_WRITE);
    }

    @Override
    protected void masterOperation(final DeleteIndexTemplateRequest request, final ClusterState state,
                                   final ActionListener<AcknowledgedResponse> listener) {
        indexTemplateService.removeTemplates(
            new MetadataIndexTemplateService
                .RemoveRequest(request.name())
                .masterTimeout(request.masterNodeTimeout()),
            new MetadataIndexTemplateService.RemoveListener() {
                @Override
                public void onResponse(MetadataIndexTemplateService.RemoveResponse response) {
                    listener.onResponse(new AcknowledgedResponse(response.acknowledged()));
                }

                @Override
                public void onFailure(Exception e) {
                    logger.debug(() -> new ParameterizedMessage("failed to delete templates [{}]", request.name()), e);
                    listener.onFailure(e);
                }
            });
    }
}
