/**

  * 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;

 import com.jcabi.aspects.Immutable;

 import com.jcabi.aspects.Loggable;

 import com.jcabi.http.Request;

 import com.jcabi.http.response.RestResponse;

 import java.io.IOException;

 import java.net.HttpURLConnection;

 import javax.json.Json;

 import javax.json.JsonObject;

 import javax.json.JsonObjectBuilder;

 import javax.json.JsonStructure;

 import lombok.EqualsAndHashCode;

 import org.hamcrest.Matchers;

 /**

  * Github pull request.

  *

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

  * @version $Id: 2b4a2c75941ec5d4f7f131352f1b4697c973fdf0 $

  * @since 0.3

  * @checkstyle MultipleStringLiterals (500 lines)

  */

 @Immutable

 @Loggable(Loggable.DEBUG)

 @EqualsAndHashCode(of = { "request", "owner", "num" })

 @SuppressWarnings("PMD.TooManyMethods")

 final class RtPull implements Pull {

     /**

      * API entry point.

      */

     private final transient Request entry;

     /**

      * RESTful request.

      */

     private final transient Request request;

     /**

      * Repository we're in.

      */

     private final transient Repo owner;

     /**

      * Pull request number.

      */

     private final transient int num;

     /**

      * Public ctor.

      * @param req Request

      * @param repo Repository

      * @param number Number of the get

      */

     RtPull(final Request req, final Repo repo, final int number) {

         this.entry = req;

         final Coordinates coords = repo.coordinates();

         this.request = this.entry.uri()

             .path("/repos")

             .path(coords.user())

             .path(coords.repo())

             .path("/pulls")

             .path(Integer.toString(number))

             .back();

         this.owner = repo;

         this.num = number;

     }

     @Override

     public String toString() {

         return this.request.uri().get().toString();

     }

     @Override

     public Repo repo() {

         return this.owner;

     }

     @Override

     public int number() {

         return this.num;

     }

     @Override

     public Iterable<Commit> commits() throws IOException {

         return new RtPagination<Commit>(

             this.request.uri().path("/commits").back(),

             new RtValuePagination.Mapping<Commit, JsonObject>() {

                 @Override

                 public Commit map(final JsonObject object) {

                     return new RtCommit(

                         RtPull.this.entry,

                         RtPull.this.owner,

                         object.getString("sha")

                     );

                 }

             }

         );

     }

     @Override

     public Iterable<JsonObject> files() throws IOException {

         return new RtPagination<JsonObject>(

                 this.request.uri().path("/files").back(),

                 RtPagination.COPYING

         );

     }

     @Override

     public void merge(

         final String msg)

         throws IOException {

         final JsonStructure json = Json.createObjectBuilder()

             .add("commit_message", msg)

             .build();

         this.merge(json).assertStatus(HttpURLConnection.HTTP_OK);

     }

     @Override

     public MergeState merge(

         final String msg,

         final String sha)

         throws IOException {

         final JsonObjectBuilder builder = Json.createObjectBuilder()

             .add("commit_message", msg).add("sha", sha);

         final RestResponse response = this.merge(builder.build())

             .assertStatus(

                 Matchers.isOneOf(

                     HttpURLConnection.HTTP_OK,

                     HttpURLConnection.HTTP_BAD_METHOD,

                     HttpURLConnection.HTTP_CONFLICT

                 )

             );

         final MergeState mergeState;

         switch (response.status()) {

             case HttpURLConnection.HTTP_OK:

                 mergeState = MergeState.SUCCESS;

                 break;

             case HttpURLConnection.HTTP_BAD_METHOD:

                 mergeState = MergeState.NOT_MERGEABLE;

                 break;

             default:

                 mergeState = MergeState.BAD_HEAD;

                 break;

         }

         return mergeState;

     }

     @Override

     public PullComments comments() throws IOException {

         return new RtPullComments(this.entry, this);

     }

     @Override

     public PullRef base() throws IOException {

         return new RtPullRef(

             this.owner.github(),

             this.json().getJsonObject("base")

         );

     }

     @Override

     public PullRef head() throws IOException {

         return new RtPullRef(

             this.owner.github(),

             this.json().getJsonObject("head")

         );

     }

     @Override

     public JsonObject json() throws IOException {

         return new RtJson(this.request).fetch();

     }

     @Override

     public void patch(final JsonObject json) throws IOException {

         new RtJson(this.request).patch(json);

     }

     @Override

     public int compareTo(

         final Pull pull

     ) {

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

     }

     /**

      * Helper method for merge operations.

      * @param payload The JSON payload for the merge

      * @return Response received from GitHub

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

      */

     private RestResponse merge(final JsonStructure payload)

         throws IOException {

         return this.request.uri()

             .path("/merge").back()

             .body().set(payload).back()

             .method(Request.PUT)

             .fetch()

             .as(RestResponse.class);

     }

 }