/**

  * Copyright (c) 2014, 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.rest;

 import co.stateful.spi.Counter;

 import java.io.IOException;

 import java.math.BigDecimal;

 import java.net.HttpURLConnection;

 import javax.ws.rs.GET;

 import javax.ws.rs.PUT;

 import javax.ws.rs.Path;

 import javax.ws.rs.PathParam;

 import javax.ws.rs.Produces;

 import javax.ws.rs.QueryParam;

 import javax.ws.rs.WebApplicationException;

 import javax.ws.rs.core.MediaType;

 import javax.ws.rs.core.Response;

 /**

  * Counter of a user.

  *

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

  * @version $Id$

  */

 @Path("/c/{cnt}")

 public final class CounterRs extends BaseRs {

     /**

      * The counter we're working with.

      */

     private transient Counter counter;

     /**

      * Set counter.

      * @param name Counter name

      */

     @PathParam("cnt")

     public void setCounter(final String name) {

         this.counter = this.user().counters().get(name);

     }

     /**

      * Set counter.

      * @param value Value to set

      * @return The JAX-RS response

      * @throws IOException If fails due to IO problem

      */

     @PUT

     @Path("/set")

     public Response set(@QueryParam("value") final String value)

         throws IOException {

         this.counter.set(this.decimal(value));

         return Response.ok().build();

     }

     /**

      * Add counter.

      * @param value Value to add

      * @return The JAX-RS response

      * @throws IOException If fails due to IO problem

      */

     @GET

     @Path("/inc")

     @Produces(MediaType.TEXT_PLAIN)

     public Response increment(@QueryParam("value") final String value)

         throws IOException {

         return Response.ok()

             .entity(this.counter.increment(this.decimal(value)).toString())

             .build();

     }

     /**

      * Convert string to decimal.

      * @param text Text to convert

      * @return Decimal

      */

     private BigDecimal decimal(final String text) {

         if (!text.matches("-?[0-9]{1,32}")) {

             throw new WebApplicationException(

                 Response.status(HttpURLConnection.HTTP_BAD_REQUEST)

                     .entity("1-32 integer allowed as a value")

                     .build()

             );

         }

         return new BigDecimal(text);

     }

 }