/**

  * Copyright (c) 2014-2015, Thindeck.com

  * 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 thindeck.com 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 com.thindeck.agents;

 import com.jcabi.aspects.Immutable;

 import com.jcabi.aspects.Tv;

 import com.jcabi.immutable.ArrayMap;

 import com.jcabi.log.Logger;

 import com.jcabi.xml.XML;

 import com.thindeck.api.Agent;

 import java.io.IOException;

 import java.text.ParseException;

 import java.util.Collection;

 import java.util.Date;

 import java.util.concurrent.TimeUnit;

 import org.apache.commons.lang3.time.DateFormatUtils;

 import org.xembly.Directive;

 import org.xembly.Directives;

 /**

  * Terminate waste containers that is ALIVE for too long.

  *

  * @author Yegor Bugayenko (yegor@teamed.io)

  * @version $Id$

  * @since 0.1

  */

 @Immutable

 public final class TerminateDocker implements Agent {

     /**

      * Script to use.

      */

     private final transient Script script;

     /**

      * Ctor.

      * @throws IOException If fails

      */

     public TerminateDocker() throws IOException {

         this(

             new Script.Default(

                 TerminateDocker.class.getResource("terminate-docker.sh")

             )

         );

     }

     /**

      * Ctor.

      * @param spt Script.

      */

     public TerminateDocker(final Script spt) {

         this.script = spt;

     }

     @Override

     public Iterable<Directive> exec(final XML deck) throws IOException {

         final Collection<XML> containers = deck.nodes(

             "/deck/containers/container[@waste and @state='alive']"

         );

         final Date today = new Date();

         for (final XML ctr : containers) {

             final int age;

             try {

                 age = (int) ((today.getTime()

                     - DateFormatUtils.ISO_DATETIME_FORMAT.parse(

                         ctr.xpath("@waste").get(0)

                     ).getTime()) / TimeUnit.MINUTES.toMillis(1L));

             } catch (final ParseException ex) {

                 throw new IOException(ex);

             }

             if (age < Tv.TEN) {

                 continue;

             }

             final String name = ctr.xpath("name/text()").get(0);

             Logger.info(

                 this, "Container %s has to die, it's in waste for over %d mins",

                 name, age

             );

             this.terminate(

                 ctr.xpath("host/text()").get(0),

                 name

             );

         }

         return new Directives();

     }

     /**

      * Terminate docker container.

      * @param host Host

      * @param name Name of container

      * @throws IOException If fails

      */

     private void terminate(final String host, final String name)

         throws IOException {

         this.script.exec(

             host,

             new ArrayMap<String, String>().with("container", name)

         );

         Logger.info(

             StartDocker.class,

             "Docker container %s terminated at %s", name, host

         );

     }

 }