/*
 * 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.upgrade;

import org.elasticsearch.action.admin.indices.upgrade.get.UpgradeStatusResponse;
import org.elasticsearch.action.admin.indices.upgrade.post.UpgradeRequest;
import org.elasticsearch.action.admin.indices.upgrade.post.UpgradeResponse;
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.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.support.RestBuilderListener;

import java.util.Map;

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.RestActions.buildBroadcastShardsHeader;


public class RestUpgradeAction extends BaseRestHandler {

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

        controller.registerHandler(GET, "/_upgrade", this);
        controller.registerHandler(GET, "/{index}/_upgrade", this);
    }

    @Override
    protected void handleRequest(RestRequest request, RestChannel channel, Client client) throws Exception {
        if (request.method().equals(RestRequest.Method.GET)) {
            handleGet(request, channel, client);
        } else if (request.method().equals(RestRequest.Method.POST)) {
            handlePost(request, channel, client);
        }
    }

    void handleGet(final RestRequest request, RestChannel channel, Client client) {
        client.admin().indices().prepareUpgradeStatus(Strings.splitStringByCommaToArray(request.param("index")))
                .execute(new RestBuilderListener<UpgradeStatusResponse>(channel) {
                    @Override
                    public RestResponse buildResponse(UpgradeStatusResponse response, XContentBuilder builder) throws Exception {
                        builder.startObject();
                        response.toXContent(builder, request);
                        builder.endObject();
                        return new BytesRestResponse(OK, builder);
                    }
                });
    }

    void handlePost(final RestRequest request, RestChannel channel, Client client) {
        UpgradeRequest upgradeReq = new UpgradeRequest(Strings.splitStringByCommaToArray(request.param("index")));
        upgradeReq.upgradeOnlyAncientSegments(request.paramAsBoolean("only_ancient_segments", false));
        client.admin().indices().upgrade(upgradeReq, new RestBuilderListener<UpgradeResponse>(channel) {
            @Override
            public RestResponse buildResponse(UpgradeResponse response, XContentBuilder builder) throws Exception {
                builder.startObject();
                buildBroadcastShardsHeader(builder, response);
                builder.startObject("upgraded_indices");
                for (Map.Entry<String, String> entry : response.versions().entrySet()) {
                    builder.field(entry.getKey(), entry.getValue(), XContentBuilder.FieldCaseConversion.NONE);
                }
                builder.endObject();
                builder.endObject();
                return new BytesRestResponse(OK, builder);
            }
        });
    }

}
