/**

  * Copyright (c) 2014-2016, stateful.co

  * All rights reserved.

  *

  * Redistribution and use in source and binary forms, with or without

  * modification, are permitted provided that the following conditions

  * are met: 1) Redistributions of source code must retain the above

  * copyright notice, this list of conditions and the following

  * disclaimer. 2) Redistributions in binary form must reproduce the above

  * copyright notice, this list of conditions and the following

  * disclaimer in the documentation and/or other materials provided

  * with the distribution. 3) Neither the name of the stateful.co nor

  * the names of its contributors may be used to endorse or promote

  * products derived from this software without specific prior written

  * permission.

  *

  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS

  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT

  * NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND

  * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL

  * THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,

  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES

  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR

  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,

  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)

  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED

  * OF THE POSSIBILITY OF SUCH DAMAGE.

  */

 package co.stateful;

 import com.jcabi.aspects.Immutable;

 import com.jcabi.aspects.Loggable;

 import com.jcabi.http.Request;

 import com.jcabi.http.response.RestResponse;

 import com.jcabi.http.response.XmlResponse;

 import com.jcabi.log.Logger;

 import java.io.IOException;

 import java.net.HttpURLConnection;

 import javax.ws.rs.core.HttpHeaders;

 import javax.ws.rs.core.MediaType;

 import lombok.EqualsAndHashCode;

 import lombok.ToString;

 /**

  * Counter.

  *

  * @author Yegor Bugayenko (yegor@tpc2.com)

  * @version $Id$

  * @since 0.1

  * @checkstyle MultipleStringLiteralsCheck (500 lines)

  */

 @Immutable

 @Loggable(Loggable.DEBUG)

 @ToString(of = "label", includeFieldNames = false)

 @EqualsAndHashCode(of = { "label", "request" })

 final class RtCounter implements Counter {

     /**

      * Its name.

      */

     private final transient String label;

     /**

      * Home request.

      */

     private final transient Request request;

     /**

      * Ctor.

      * @param name Name of it

      * @param req Home page request

      */

     RtCounter(final String name, final Request req) {

         this.label = name;

         this.request = req;

     }

     @Override

     public String name() {

         return this.label;

     }

     @Override

     public void set(final long value) throws IOException {

         final long start = System.currentTimeMillis();

         this.front("set").method(Request.PUT)

             .uri().queryParam("value", value).back()

             .fetch()

             .as(RestResponse.class)

             .assertStatus(HttpURLConnection.HTTP_OK);

         Logger.info(

             this, "counter \"%s\" set to %d in %[ms]s",

             this.label, value,

             System.currentTimeMillis() - start

         );

     }

     @Override

     public long incrementAndGet(final long delta) throws IOException {

         final long start = System.currentTimeMillis();

         final long value = Long.parseLong(

             this.front("increment").method(Request.GET)

                 .uri().queryParam("value", delta).back()

                 .header(HttpHeaders.ACCEPT, MediaType.TEXT_PLAIN)

                 .fetch()

                 .as(RestResponse.class)

                 .assertStatus(HttpURLConnection.HTTP_OK)

                 .body()

         );

         Logger.info(

             this, "counter \"%s\" incremented by %d to %d in %[ms]s",

             this.label, delta, value,

             System.currentTimeMillis() - start

         );

         return value;

     }

     /**

      * Get front request.

      * @param ops Operation

      * @return Request

      * @throws IOException If fails

      */

     private Request front(final String ops) throws IOException {

         return this.request.fetch()

             .as(RestResponse.class)

             .assertStatus(HttpURLConnection.HTTP_OK)

             .as(XmlResponse.class)

             .rel(

                 String.format(

                     // @checkstyle LineLength (1 line)

                     "/page/counters/counter[name='%s']/links/link[@rel='%s']/@href",

                     this.label, ops

                 )

             );

     }

 }