/*
 * 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.admin.indices.analyze;

import org.elasticsearch.ElasticsearchIllegalArgumentException;
import org.elasticsearch.action.ActionListener;
import org.elasticsearch.action.admin.indices.analyze.AnalyzeRequest;
import org.elasticsearch.action.admin.indices.analyze.AnalyzeResponse;
import org.elasticsearch.client.Client;
import org.elasticsearch.common.inject.Inject;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.common.xcontent.XContentBuilder;
import org.elasticsearch.rest.*;

import java.io.IOException;

import static org.elasticsearch.rest.RestRequest.Method.GET;
import static org.elasticsearch.rest.RestRequest.Method.POST;
import static org.elasticsearch.rest.RestStatus.OK;
import static org.elasticsearch.rest.action.support.RestXContentBuilder.restContentBuilder;

/**
 *
 */
public class RestAnalyzeAction extends BaseRestHandler {

    @Inject
    public RestAnalyzeAction(Settings settings, Client client, RestController controller) {
        super(settings, client);
        controller.registerHandler(GET, "/_analyze", this);
        controller.registerHandler(GET, "/{index}/_analyze", this);
        controller.registerHandler(POST, "/_analyze", this);
        controller.registerHandler(POST, "/{index}/_analyze", this);
    }

    @Override
    public void handleRequest(final RestRequest request, final RestChannel channel) {
        String text = request.param("text");
        if (text == null && request.hasContent()) {
            text = request.content().toUtf8();
        }
        if (text == null) {
            try {
                channel.sendResponse(new XContentThrowableRestResponse(request, new ElasticsearchIllegalArgumentException("text is missing")));
            } catch (IOException e1) {
                logger.warn("Failed to send response", e1);
            }
            return;
        }

        AnalyzeRequest analyzeRequest = new AnalyzeRequest(request.param("index"), text);
        analyzeRequest.listenerThreaded(false);
        analyzeRequest.preferLocal(request.paramAsBoolean("prefer_local", analyzeRequest.preferLocalShard()));
        analyzeRequest.analyzer(request.param("analyzer"));
        analyzeRequest.field(request.param("field"));
        analyzeRequest.tokenizer(request.param("tokenizer"));
        analyzeRequest.tokenFilters(request.paramAsStringArray("token_filters", request.paramAsStringArray("filters", null)));
        client.admin().indices().analyze(analyzeRequest, new ActionListener<AnalyzeResponse>() {
            @Override
            public void onResponse(AnalyzeResponse response) {
                try {
                    XContentBuilder builder = restContentBuilder(request, null);
                    builder.startObject();
                    response.toXContent(builder, request);
                    builder.endObject();
                    channel.sendResponse(new XContentRestResponse(request, OK, 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);
                }
            }
        });
    }
}
