/**

  * Copyright (c) 2013-2017, jcabi.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 jcabi.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.jcabi.github.mock;

 import com.jcabi.aspects.Immutable;

 import com.jcabi.aspects.Loggable;

 import com.jcabi.github.Gist;

 import com.jcabi.github.GistComments;

 import com.jcabi.github.Github;

 import com.jcabi.xml.XML;

 import java.io.IOException;

 import java.util.List;

 import javax.json.JsonObject;

 import lombok.EqualsAndHashCode;

 import lombok.ToString;

 import org.apache.commons.lang3.StringUtils;

 import org.xembly.Directives;

 /**

  * Mock Github gist.

  *

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

  * @version $Id: fab6244753d38021640e27c66733875531543022 $

  * @since 0.5

  */

 @Immutable

 @Loggable(Loggable.DEBUG)

 @ToString

 @EqualsAndHashCode(of = { "storage", "self", "gist" })

 @SuppressWarnings("PMD.TooManyMethods")

 final class MkGist implements Gist {

     /**

      * Storage.

      */

     private final transient MkStorage storage;

     /**

      * Login of the user logged in.

      */

     private final transient String self;

     /**

      * Gist name.

      */

     private final transient String gist;

     /**

      * Public ctor.

      * @param stg Storage

      * @param login User to login

      * @param name Gist name

      * @checkstyle ParameterNumber (5 lines)

      */

     MkGist(

         final MkStorage stg,

         final String login,

         final String name

     ) {

         this.storage = stg;

         this.self = login;

         this.gist = name;

     }

     @Override

     public Github github() {

         return new MkGithub(this.storage, this.self);

     }

     @Override

     public String identifier() {

         return this.gist;

     }

     @Override

     public String read(

         final String file

     ) throws IOException {

         final List<XML> files = this.storage.xml().nodes(

             String.format(

                 "%s/files/file[filename='%s']",

                 this.xpath(), file

             )

         );

         if (files.isEmpty()) {

             throw new IOException(

                 String.format("Couldn't find file with the name %s.", file)

             );

         }

         final List<String> contents = files.get(0)

             .xpath("raw_content/text()");

         String content = "";

         if (!contents.isEmpty()) {

             content = contents.get(0);

         }

         return content;

     }

     @Override

     public void write(

         final String file,

         final String content

     )

         throws IOException {

         this.storage.apply(

             // @checkstyle MultipleStringLiterals (3 lines)

             new Directives().xpath(this.xpath()).xpath(

                 String.format("files[not(file[filename='%s'])]", file)

             ).add("file").add("filename").set(file).up().add("raw_content")

         );

         this.storage.apply(

             new Directives().xpath(this.xpath()).xpath(

                 String.format(

                     "files/file[filename='%s']/raw_content",

                     file

                 )

             ).set(content)

         );

     }

     /**

      * Stars.

      * @throws IOException If there is any I/O problem

      * @checkstyle MultipleStringLiterals (10 lines)

      */

     @Override

     public void star() throws IOException {

         this.storage.apply(

             new Directives()

                 .xpath(this.xpath())

                 .attr("starred", Boolean.toString(true))

         );

     }

     /**

      * Unstars.

      * @throws IOException If there is any I/O problem

      * @checkstyle MultipleStringLiterals (10 lines)

      */

     @Override

     public void unstar() throws IOException {

         this.storage.apply(

             new Directives()

                 .xpath(this.xpath())

                 .attr("starred", Boolean.toString(false))

         );

     }

     /**

      * Checks if starred.

      * @return True if gist is starred

      * @throws IOException If there is any I/O problem

      */

     @Override

     public boolean starred() throws IOException {

         final List<String> xpath = this.storage.xml().xpath(

             String.format("%s/@starred", this.xpath())

         );

         return !xpath.isEmpty() && StringUtils.equalsIgnoreCase(

             Boolean.toString(true),

             xpath.get(0)

         );

     }

     @Override

     public Gist fork() throws IOException {

         this.storage.lock();

         final String number;

         try {

             final XML xml = this.storage.xml();

             number = Integer.toString(

                 1 + xml.xpath("/github/gists/gist/id/text()").size()

             );

             final Directives dirs = new Directives().xpath("/github/gists")

                 .add("gist")

                 .add("id").set(number).up()

                 .add("files");

             final List<XML> files = xml.nodes(

                 String.format("%s/files/file", this.xpath())

             );

             for (final XML file : files) {

                 final String filename = file.xpath("filename/text()").get(0);

                 // @checkstyle MultipleStringLiterals (3 lines)

                 dirs.add("file")

                     .add("filename").set(filename).up()

                     .add("raw_content").set(this.read(filename)).up().up();

             }

             this.storage.apply(dirs);

         } finally {

             this.storage.unlock();

         }

         return new MkGist(this.storage, this.self, number);

     }

     @Override

     public GistComments comments() throws IOException {

         throw new UnsupportedOperationException();

     }

     @Override

     public JsonObject json() throws IOException {

         return new JsonNode(

             this.storage.xml().nodes(this.xpath()).get(0)

         ).json();

     }

     @Override

     public void patch(

         final JsonObject json

     ) throws IOException {

         new JsonPatch(this.storage).patch(this.xpath(), json);

     }

     /**

      * XPath of this element in XML tree.

      * @return XPath

      */

     private String xpath() {

         return String.format(

             "/github/gists/gist[id='%s']",

             this.gist

         );

     }

 }