content: /**
   * Copyright (c) 2018-2019, Mihai Emil Andronache
   * 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 docker-java-api 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.amihaiemil.docker;
  
  import java.io.ByteArrayInputStream;
  import java.io.IOException;
  import java.io.InputStreamReader;
  import java.io.Reader;
  import java.net.URI;
  import java.net.URL;
  import java.nio.file.Files;
  import java.nio.file.Paths;
  import java.util.StringJoiner;
  import javax.json.Json;
  import org.apache.http.HttpStatus;
  import org.apache.http.client.HttpClient;
  import org.apache.http.client.methods.HttpGet;
  import org.apache.http.client.methods.HttpPost;
  import org.apache.http.entity.ContentType;
  import org.apache.http.entity.StringEntity;
  
  /**
   * Runtime {@link Images}.
   * @author George Aristy (george.aristy@gmail.com)
   * @version $Id: 6ce6225c29a243014dad1e2e204186b2f518bd2e $
   * @since 0.0.1
   */
  abstract class RtImages implements Images {
      /**
       * Apache HttpClient which sends the requests.
       */
      private final HttpClient client;
  
      /**
       * Base URI for Images API.
       */
      private final URI baseUri;
  
      /**
       * Docker API.
       */
      private final Docker docker;
  
      /**
       * Ctor.
       * @param client The http client.
       * @param uri The URI for this Images API.
       * @param dkr The docker entry point.
       * @checkstyle ParameterNumber (10 lines)
       */
      RtImages(final HttpClient client, final URI uri, final Docker dkr) {
          this.client = client;
          this.baseUri = uri;
          this.docker = dkr;
      }
  
      @Override
      public Image pull(
          final String name, final String tag
      ) throws IOException, UnexpectedResponseException {
          final HttpPost create  = new HttpPost(
              new UncheckedUriBuilder(this.baseUri.toString().concat("/create"))
                  .addParameter("fromImage", name)
                  .addParameter("tag", tag)
                  .build()
          );
          try {
              this.client.execute(
                  create,
                  new MatchStatus(create.getURI(), HttpStatus.SC_OK)
              );
              return new RtImage(
                  Json.createObjectBuilder().add("Name", name).build(),
                  this.client,
                  URI.create(
                      this.baseUri.toString() + "/" + name
                  ),
                  this.docker
              );
          } finally {
              create.releaseConnection();
          }
      }
  
      @Override
      public Image importImage(
          final URL source, final String repo
      ) throws IOException, UnexpectedResponseException {
          final HttpPost create  = new HttpPost(
              new UncheckedUriBuilder(this.baseUri.toString().concat("/create"))
                  .addParameter("fromSrc", source.toString())
                  .addParameter("repo", repo)
                  .build()
          );
          try {
              this.client.execute(
                  create,
                  new MatchStatus(create.getURI(), HttpStatus.SC_OK)
              );
              return new RtImage(
                  Json.createObjectBuilder().add("Name", repo).build(),
                  this.client,
                  URI.create(
                      String.format("%s/%s", this.baseUri.toString(), repo)
                  ),
                  this.docker
              );
          } finally {
              create.releaseConnection();
          }
      }
  
      @Override
      public Images importFromTar(
          final String file) throws IOException, UnexpectedResponseException {
          final HttpPost load  = new HttpPost(
              new UncheckedUriBuilder(this.baseUri.toString().concat("/load"))
                  .build()
          );
          try {
              load.setEntity(
                  new StringEntity(
                      new String(
                          Files.readAllBytes(Paths.get(file))
                      ),
                      ContentType.DEFAULT_BINARY
                  )
              );
              this.client.execute(
                  load,
                  new MatchStatus(load.getURI(), HttpStatus.SC_OK)
              );
          } finally {
              load.releaseConnection();
          }
          return this;
      }
  
      @Override
      public void prune() throws IOException, UnexpectedResponseException {
          final HttpPost prune = new HttpPost(
              this.baseUri.toString().concat("/prune")
          );
          try {
              this.client.execute(
                  prune,
                  new MatchStatus(prune.getURI(), HttpStatus.SC_OK)
              );
          } finally {
              prune.releaseConnection();
          }
      }
  
      @Override
      public Reader save() throws IOException, UnexpectedResponseException {
          final Reader tarball;
          final StringJoiner names = new StringJoiner(",");
          for(final Image img : this) {
              names.add(img.getString("Id"));
          }
          if(names.toString().isEmpty()) {
              tarball = new InputStreamReader(
                  new ByteArrayInputStream(new byte[]{})
              );
          } else {
              final HttpGet save = new HttpGet(
                  new UncheckedUriBuilder(this.baseUri.toString().concat("/get"))
                      .addParameter("names", names.toString())
                      .build()
              );
              tarball = this.client.execute(
                  save,
                  new ReadStream(
                      new MatchStatus(save.getURI(), HttpStatus.SC_OK)
                  )
              );
          }
          return tarball;
      }
  
  
      @Override
      public Docker docker() {
          return this.docker;
      }
  
      /**
       * Get the (protected) HttpClient for subclasses.
       * @return HttpClient.
       */
      HttpClient client() {
          return this.client;
      }
  
      /**
       * Get the (protected) base URI for subclasses.
       * @return URI.
       */
      URI baseUri() {
          return this.baseUri;
      }
  }
  