/*
 * 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.rest.action.deletebyquery;

import org.elasticsearch.action.ActionListener;
import org.elasticsearch.action.WriteConsistencyLevel;
import org.elasticsearch.action.deletebyquery.DeleteByQueryRequest;
import org.elasticsearch.action.deletebyquery.DeleteByQueryResponse;
import org.elasticsearch.action.deletebyquery.IndexDeleteByQueryResponse;
import org.elasticsearch.action.deletebyquery.ShardDeleteByQueryRequest;
import org.elasticsearch.action.support.IndicesOptions;
import org.elasticsearch.action.support.QuerySourceBuilder;
import org.elasticsearch.action.support.replication.ReplicationType;
import org.elasticsearch.client.Client;
import org.elasticsearch.common.Strings;
import org.elasticsearch.common.inject.Inject;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.common.xcontent.XContentBuilder;
import org.elasticsearch.rest.*;
import org.elasticsearch.rest.action.support.RestActions;
import org.elasticsearch.rest.action.support.RestXContentBuilder;

import java.io.IOException;

import static org.elasticsearch.rest.RestRequest.Method.DELETE;
import static org.elasticsearch.rest.RestStatus.PRECONDITION_FAILED;

/**
 *
 */
public class RestDeleteByQueryAction extends BaseRestHandler {

    @Inject
    public RestDeleteByQueryAction(Settings settings, Client client, RestController controller) {
        super(settings, client);
        controller.registerHandler(DELETE, "/{index}/_query", this);
        controller.registerHandler(DELETE, "/{index}/{type}/_query", this);
    }

    @Override
    public void handleRequest(final RestRequest request, final RestChannel channel) {
        DeleteByQueryRequest deleteByQueryRequest = new DeleteByQueryRequest(Strings.splitStringByCommaToArray(request.param("index")));
        deleteByQueryRequest.listenerThreaded(false);
        try {
            if (request.hasContent()) {
                deleteByQueryRequest.source(request.content(), request.contentUnsafe());
            } else {
                String source = request.param("source");
                if (source != null) {
                    deleteByQueryRequest.source(source);
                } else {
                    QuerySourceBuilder querySourceBuilder = RestActions.parseQuerySource(request);
                    if (querySourceBuilder != null) {
                        deleteByQueryRequest.source(querySourceBuilder);
                    }
                }
            }
            deleteByQueryRequest.types(Strings.splitStringByCommaToArray(request.param("type")));
            deleteByQueryRequest.timeout(request.paramAsTime("timeout", ShardDeleteByQueryRequest.DEFAULT_TIMEOUT));

            deleteByQueryRequest.routing(request.param("routing"));
            String replicationType = request.param("replication");
            if (replicationType != null) {
                deleteByQueryRequest.replicationType(ReplicationType.fromString(replicationType));
            }
            String consistencyLevel = request.param("consistency");
            if (consistencyLevel != null) {
                deleteByQueryRequest.consistencyLevel(WriteConsistencyLevel.fromString(consistencyLevel));
            }
            deleteByQueryRequest.indicesOptions(IndicesOptions.fromRequest(request, deleteByQueryRequest.indicesOptions()));
        } catch (Exception e) {
            try {
                XContentBuilder builder = RestXContentBuilder.restContentBuilder(request);
                channel.sendResponse(new XContentRestResponse(request, PRECONDITION_FAILED, builder.startObject().field("error", e.getMessage()).endObject()));
            } catch (IOException e1) {
                logger.error("Failed to send failure response", e1);
            }
            return;
        }
        client.deleteByQuery(deleteByQueryRequest, new ActionListener<DeleteByQueryResponse>() {
            @Override
            public void onResponse(DeleteByQueryResponse result) {
                try {
                    XContentBuilder builder = RestXContentBuilder.restContentBuilder(request);
                    RestStatus restStatus = result.status();
                    builder.startObject();
                    builder.startObject("_indices");
                    for (IndexDeleteByQueryResponse indexDeleteByQueryResponse : result.getIndices().values()) {
                        builder.startObject(indexDeleteByQueryResponse.getIndex(), XContentBuilder.FieldCaseConversion.NONE);

                        builder.startObject("_shards");
                        builder.field("total", indexDeleteByQueryResponse.getTotalShards());
                        builder.field("successful", indexDeleteByQueryResponse.getSuccessfulShards());
                        builder.field("failed", indexDeleteByQueryResponse.getFailedShards());
                        builder.endObject();

                        builder.endObject();
                    }
                    builder.endObject();
                    builder.endObject();
                    channel.sendResponse(new XContentRestResponse(request, restStatus, builder));
                } catch (Throwable e) {
                    onFailure(e);
                }
            }

            @Override
            public void onFailure(Throwable e) {
                try {
                    channel.sendResponse(new XContentThrowableRestResponse(request, e));
                } catch (IOException e1) {
                    logger.error("Failed to send failure response", e1);
                }
            }
        });
    }
}
