/**

  * 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.JsonResponse;

 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.JsonStructure;

 import javax.json.JsonValue;

 import lombok.EqualsAndHashCode;

 /**

  * Github contents.

  * @author Andres Candal (andres.candal@rollasolution.com)

  * @version $Id: 28d33353829cb8f1e79cc8df9a87c5ad1f51e7f6 $

  * @since 0.8

  * @checkstyle MultipleStringLiteralsCheck (300 lines)

  */

 @Immutable

 @Loggable(Loggable.DEBUG)

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

 @SuppressWarnings("PMD.AvoidDuplicateLiterals")

 final class RtContents implements Contents {

     /**

      * API entry point.

      */

     private final transient Request entry;

     /**

      * Repository.

      */

     private final transient Repo owner;

     /**

      * RESTful request.

      */

     private final transient Request request;

     /**

      * Public ctor.

      * @param req RESTful API entry point

      * @param repo Repository

      */

     public RtContents(final Request req, final Repo repo) {

         this.entry = req;

         this.owner = repo;

         this.request = req.uri()

             .path("/repos")

             .path(repo.coordinates().user())

             .path(repo.coordinates().repo())

             .path("/contents")

             .back();

     }

     @Override

     public Repo repo() {

         return this.owner;

     }

     @Override

     public Content readme() throws IOException {

         return new RtContent(

             this.entry, this.owner,

             this.entry.uri()

                 .path("/repos")

                 .path(this.owner.coordinates().user())

                 .path(this.owner.coordinates().repo())

                 .path("/readme")

                 .back()

                 .method(Request.GET)

                 .fetch()

                 .as(RestResponse.class)

                 .assertStatus(HttpURLConnection.HTTP_OK)

                 .as(JsonResponse.class)

                 .json().readObject().getString("path")

         );

     }

     @Override

     public Content readme(

         final String branch

     ) throws IOException {

         final JsonStructure json = Json.createObjectBuilder()

             .add("ref", branch)

             .build();

         return new RtContent(

             this.entry, this.owner,

             this.entry.uri()

                 .path("/repos")

                 .path(this.owner.coordinates().user())

                 .path(this.owner.coordinates().repo())

                 .path("/readme")

                 .back()

                 .method(Request.GET)

                 .body().set(json).back()

                 .fetch()

                 .as(RestResponse.class)

                 .assertStatus(HttpURLConnection.HTTP_OK)

                 .as(JsonResponse.class)

                 .json().readObject().getString("path")

         );

     }

     @Override

     public Content create(

         final JsonObject content

     )

         throws IOException {

         if (!content.containsKey("path")) {

             throw new IllegalStateException(

                 "Content should have path parameter"

             );

         }

         final String path = content.getString("path");

         return new RtContent(

             this.entry, this.owner,

             this.request.method(Request.PUT)

                 .uri().path(path).back()

                 .body().set(content).back()

                 .fetch()

                 .as(RestResponse.class)

                 .assertStatus(HttpURLConnection.HTTP_CREATED)

                 .as(JsonResponse.class)

                 .json().readObject().getJsonObject("content").getString("path")

         );

     }

     @Override

     public Content get(

         final String path,

         final String ref

     ) throws IOException {

         return this.content(path, ref);

     }

     @Override

     public Content get(

         final String path

     ) throws IOException {

         return this.content(path, "master");

     }

     @Override

     public Iterable<Content> iterate(

         final String path,

         final String ref

     ) {

         return new RtPagination<Content>(

             this.request.method(Request.GET)

                 .uri().path(path).queryParam("ref", ref).back(),

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

                 @Override

                 public Content map(final JsonObject object) {

                     return new RtContent(

                         RtContents.this.entry, RtContents.this.owner,

                         object.getString("path")

                     );

                 };

             }

         );

     }

     @Override

     public RepoCommit remove(final JsonObject content

     )

         throws IOException {

         if (!content.containsKey("path")) {

             throw new IllegalStateException(

                 "Content should have path parameter"

             );

         }

         final String path = content.getString("path");

         return new RtRepoCommit(

             this.entry,

             this.owner,

             this.request.method(Request.DELETE)

                 .uri().path(path).back()

                 .body().set(content).back().fetch()

                 .as(RestResponse.class)

                 .assertStatus(HttpURLConnection.HTTP_OK)

                 .as(JsonResponse.class).json()

                 .readObject().getJsonObject("commit").getString("sha")

         );

     }

     @Override

     public RepoCommit update(

         final String path,

         final JsonObject json)

         throws IOException {

         return new RtRepoCommit(

             this.entry,

             this.owner,

             this.request.uri().path(path).back()

                 .method(Request.PUT)

                 .body().set(json).back()

                 .fetch()

                 .as(RestResponse.class)

                 .assertStatus(HttpURLConnection.HTTP_OK)

                 .as(JsonResponse.class).json()

                 .readObject().getJsonObject("commit").getString("sha")

         );

     }

     @Override

     public boolean exists(final String path, final String ref)

         throws IOException {

         final RestResponse response = this.request.method(Request.GET)

             .uri().path(path).queryParam("ref", ref).back()

             .fetch().as(RestResponse.class);

         return response.status() == HttpURLConnection.HTTP_OK;

     }

     /**

      * Get the contents of a file or symbolic link in a repository.

      * @param path The content path

      * @param ref The name of the commit/branch/tag.

      * @return Content fetched

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

      * @see <a href="http://developer.github.com/v3/repos/contents/#get-contents">Get contents</a>

      */

     private Content content(

         final String path, final String ref

     ) throws IOException {

         final String name = "ref";

         RtContent content = null;

         final JsonStructure structure = this.request.method(Request.GET)

                 .uri().path(path).queryParam(name, ref).back()

                 .fetch()

                 .as(RestResponse.class)

                 .assertStatus(HttpURLConnection.HTTP_OK)

                 .as(JsonResponse.class)

                 .json().read();

         if (JsonValue.ValueType.OBJECT.equals(structure.getValueType())) {

             content = new RtContent(

                     this.entry.uri().queryParam(name, ref).back(), this.owner,

                     ((JsonObject) structure).getString("path")

             );

         }

         return content;

     }

 }