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/*
 * 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.document;

import org.apache.logging.log4j.LogManager;
import org.elasticsearch.ResourceNotFoundException;
import org.elasticsearch.action.ActionRequestValidationException;
import org.elasticsearch.action.get.GetRequest;
import org.elasticsearch.action.get.GetResponse;
import org.elasticsearch.client.node.NodeClient;
import org.elasticsearch.common.bytes.BytesReference;
import org.elasticsearch.common.logging.DeprecationLogger;
import org.elasticsearch.common.xcontent.XContentBuilder;
import org.elasticsearch.common.xcontent.XContentHelper;
import org.elasticsearch.rest.BaseRestHandler;
import org.elasticsearch.rest.BytesRestResponse;
import org.elasticsearch.rest.RestChannel;
import org.elasticsearch.rest.RestController;
import org.elasticsearch.rest.RestRequest;
import org.elasticsearch.rest.RestResponse;
import org.elasticsearch.rest.action.RestResponseListener;
import org.elasticsearch.search.fetch.subphase.FetchSourceContext;

import java.io.IOException;
import java.io.InputStream;

import static org.elasticsearch.rest.RestRequest.Method.GET;
import static org.elasticsearch.rest.RestRequest.Method.HEAD;
import static org.elasticsearch.rest.RestStatus.OK;

/**
 * The REST handler for get source and head source APIs.
 */
public class RestGetSourceAction extends BaseRestHandler {

    private static final DeprecationLogger deprecationLogger = new DeprecationLogger(LogManager.getLogger(RestGetSourceAction.class));
    static final String TYPES_DEPRECATION_MESSAGE = "[types removal] Specifying types in get_source and exist_source"
            + "requests is deprecated.";

    public RestGetSourceAction(final RestController controller) {
        controller.registerHandler(GET, "/{index}/_source/{id}", this);
        controller.registerHandler(HEAD, "/{index}/_source/{id}", this);
        controller.registerHandler(GET, "/{index}/{type}/{id}/_source", this);
        controller.registerHandler(HEAD, "/{index}/{type}/{id}/_source", this);
    }

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

    @Override
    public RestChannelConsumer prepareRequest(final RestRequest request, final NodeClient client) throws IOException {
        final GetRequest getRequest;
        if (request.hasParam("type")) {
            deprecationLogger.deprecatedAndMaybeLog("get_source_with_types", TYPES_DEPRECATION_MESSAGE);
            getRequest = new GetRequest(request.param("index"), request.param("type"), request.param("id"));
        } else {
            getRequest = new GetRequest(request.param("index"), request.param("id"));
        }
        getRequest.refresh(request.paramAsBoolean("refresh", getRequest.refresh()));
        getRequest.routing(request.param("routing"));
        getRequest.preference(request.param("preference"));
        getRequest.realtime(request.paramAsBoolean("realtime", getRequest.realtime()));

        getRequest.fetchSourceContext(FetchSourceContext.parseFromRestRequest(request));

        return channel -> {
            if (getRequest.fetchSourceContext() != null && !getRequest.fetchSourceContext().fetchSource()) {
                final ActionRequestValidationException validationError = new ActionRequestValidationException();
                validationError.addValidationError("fetching source can not be disabled");
                channel.sendResponse(new BytesRestResponse(channel, validationError));
            } else {
                client.get(getRequest, new RestGetSourceResponseListener(channel, request));
            }
        };
    }

    static class RestGetSourceResponseListener extends RestResponseListener {
        private final RestRequest request;

        RestGetSourceResponseListener(RestChannel channel, RestRequest request) {
            super(channel);
            this.request = request;
        }

        @Override
        public RestResponse buildResponse(final GetResponse response) throws Exception {
            checkResource(response);

            final XContentBuilder builder = channel.newBuilder(request.getXContentType(), false);
            final BytesReference source = response.getSourceInternal();
            try (InputStream stream = source.streamInput()) {
                builder.rawValue(stream, XContentHelper.xContentType(source));
            }
            return new BytesRestResponse(OK, builder);
        }

        /**
         * Checks if the requested document or source is missing.
         *
         * @param response a response
         * @throws ResourceNotFoundException if the document or source is missing
         */
        private void checkResource(final GetResponse response) {
            final String index = response.getIndex();
            final String type = response.getType();
            final String id = response.getId();

            if (response.isExists() == false) {
                throw new ResourceNotFoundException("Document not found [" + index + "]/[" + type + "]/[" + id + "]");
            } else if (response.isSourceEmpty()) {
                throw new ResourceNotFoundException("Source not found [" + index + "]/[" + type + "]/[" + id + "]");
            }
        }
    }
}