/**

  * 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.Commit;

 import com.jcabi.github.Coordinates;

 import com.jcabi.github.MergeState;

 import com.jcabi.github.Pull;

 import com.jcabi.github.PullComments;

 import com.jcabi.github.PullRef;

 import com.jcabi.github.Repo;

 import com.jcabi.xml.XML;

 import java.io.IOException;

 import java.util.Collections;

 import java.util.List;

 import javax.json.Json;

 import javax.json.JsonObject;

 import lombok.EqualsAndHashCode;

 import lombok.ToString;

 /**

  * Mock Github pull.

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

  * @version $Id: cdafe4454dafcf0bdcb429d53ac87c0d41a2ef68 $

  * @since 0.5

  */

 @Immutable

 @Loggable(Loggable.DEBUG)

 @ToString

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

 @SuppressWarnings("PMD.TooManyMethods")

 final class MkPull implements Pull {

     /**

      * The separator between the username and

      * the branch name in the labels of pull request base/head objects.

      */

     private static final String USER_BRANCH_SEP = ":";

     /**

      * Property name for ref in pull request ref JSON object.

      */

     private static final String REF_PROP = "ref";

     /**

      * Property name for label in pull request ref JSON object.

      */

     private static final String LABEL_PROP = "label";

     /**

      * Storage.

      */

     private final transient MkStorage storage;

     /**

      * Login of the user logged in.

      */

     private final transient String self;

     /**

      * Repo name.

      */

     private final transient Coordinates coords;

     /**

      * Pull number.

      */

     private final transient int num;

     /**

      * Public ctor.

      * @param stg Storage

      * @param login User to login

      * @param rep Repo

      * @param number Pull request number

      * @checkstyle ParameterNumber (5 lines)

      */

     MkPull(

         final MkStorage stg,

         final String login,

         final Coordinates rep,

         final int number) {

         this.storage = stg;

         this.self = login;

         this.coords = rep;

         this.num = number;

     }

     @Override

     public Repo repo() {

         return new MkRepo(this.storage, this.self, this.coords);

     }

     @Override

     public int number() {

         return this.num;

     }

     @Override

     public PullRef base() throws IOException {

         return new MkPullRef(

             this.storage,

             new MkBranches(

                 this.storage,

                 this.self,

                 this.coords

             ).get(

                 this.storage.xml().xpath(

                     String.format("%s/base/text()", this.xpath())

                 ).get(0)

             )

         );

     }

     @Override

     public PullRef head() throws IOException {

         final String userbranch = this.storage.xml()

             .xpath(String.format("%s/head/text()", this.xpath()))

             .get(0);

         final String[] parts = userbranch.split(MkPull.USER_BRANCH_SEP, 2);

         if (parts.length != 2) {

             throw new IllegalStateException("Invalid MkPull head");

         }

         final String user = parts[0];

         final String branch = parts[1];

         return new MkPullRef(

             this.storage,

             new MkBranches(

                 this.storage,

                 this.self,

                 new Coordinates.Simple(

                     user,

                     this.coords.repo()

                 )

             ).get(branch)

         );

     }

     @Override

     public Iterable<Commit> commits() throws IOException {

         return Collections.emptyList();

     }

     @Override

     public Iterable<JsonObject> files() throws IOException {

         return Collections.emptyList();

     }

     @Override

     public void merge(

         final String msg

     ) throws IOException {

         // nothing to do here

     }

     @Override

     public MergeState merge(

         final String msg,

         final String sha)

         throws IOException {

         throw new UnsupportedOperationException("Merge not supported");

     }

     @Override

     public PullComments comments() throws IOException {

         return new MkPullComments(this.storage, this.self, this.coords, this);

     }

     @Override

     public int compareTo(

         final Pull pull

     ) {

         return this.number() - pull.number();

     }

     @Override

     public void patch(

         final JsonObject json

     ) throws IOException {

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

     }

     @Override

     public JsonObject json() throws IOException {

         final XML xml = this.storage.xml().nodes(this.xpath()).get(0);

         final String branch = xml.xpath("base/text()").get(0);

         final String head = xml.xpath("head/text()").get(0);

         final String[] parts = head.split(MkPull.USER_BRANCH_SEP, 2);

         final List<String> patches = xml.xpath("patch/text()");

         final String patch;

         if (patches.isEmpty()) {

             patch = "";

         } else {

             patch = patches.get(0);

         }

         return Json.createObjectBuilder()

             .add(

                 "number",

                 Integer.parseInt(xml.xpath("number/text()").get(0))

             )

             .add(

                 "user",

                 Json.createObjectBuilder()

                     .add("login", xml.xpath("user/login/text()").get(0))

                     .build()

             )

             .add("patch", patch)

             .add(

                 "head",

                 Json.createObjectBuilder()

                     .add(MkPull.REF_PROP, parts[1])

                     .add(MkPull.LABEL_PROP, head)

                     .build()

             ).add(

                 "base",

                 Json.createObjectBuilder()

                     .add(MkPull.REF_PROP, branch)

                     .add(

                         MkPull.LABEL_PROP,

                         String.format(

                             "%s:%s",

                             this.coords.user(),

                             branch

                         )

                     ).build()

             ).add(

                 "comments",

                 this.storage.xml().nodes(this.comment()).size()

             ).build();

     }

     /**

      * XPath of this element in XML tree.

      * @return XPath

      */

     private String xpath() {

         return String.format(

             "/github/repos/repo[@coords='%s']/pulls/pull[number='%d']",

             this.coords, this.num

         );

     }

     /**

      * XPath of issue element in XML tree.

      * @return XPath

      */

     private String comment() {

         return String.format(

             // @checkstyle LineLengthCheck (1 line)

             "/github/repos/repo[@coords='%s']/pulls/pull[number='%d']/comments/comment",

             this.coords, this.num

         );

     }

 }