/*
    * ====================================================================
    * Licensed to the Apache Software Foundation (ASF) under one
    * or more contributor license agreements.  See the NOTICE file
    * distributed with this work for additional information
    * regarding copyright ownership.  The ASF licenses this file
    * to you under the Apache License, Version 2.0 (the
    * "License"); you may not use this file except in compliance
    * with the License.  You may obtain a copy of the License at
   *
   *   http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing,
   * software distributed under the License is distributed on an
   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
   * KIND, either express or implied.  See the License for the
   * specific language governing permissions and limitations
   * under the License.
   * ====================================================================
   *
   * This software consists of voluntary contributions made by many
   * individuals on behalf of the Apache Software Foundation.  For more
   * information on the Apache Software Foundation, please see
   * <http://www.apache.org/>.
   *
   */
  package org.apache.hc.client5.http.impl.auth;
  
  import java.util.HashMap;
  import java.util.Map;
  
  import org.apache.hc.client5.http.auth.AuthScope;
  import org.apache.hc.client5.http.auth.Credentials;
  import org.apache.hc.client5.http.auth.CredentialsProvider;
  import org.apache.hc.client5.http.auth.UsernamePasswordCredentials;
  import org.apache.hc.core5.http.HttpHost;
  import org.apache.hc.core5.util.Args;
  
  /**
   * {@link CredentialsProvider} builder.
   *
   * @since 5.2
   */
  public final class CredentialsProviderBuilder {
  
      private final Map<AuthScope, Credentials> credMap;
  
      public static CredentialsProviderBuilder create() {
          return new CredentialsProviderBuilder();
      }
  
      public CredentialsProviderBuilder() {
          super();
          this.credMap = new HashMap<>();
      }
  
      public CredentialsProviderBuilder add(final AuthScope authScope, final Credentials credentials) {
          Args.notNull(authScope, "Host");
          credMap.put(authScope, credentials);
          return this;
      }
  
      public CredentialsProviderBuilder add(final AuthScope authScope, final String username, final char[] password) {
          Args.notNull(authScope, "Host");
          credMap.put(authScope, new UsernamePasswordCredentials(username, password));
          return this;
      }
  
      public CredentialsProviderBuilder add(final HttpHost httpHost, final Credentials credentials) {
          Args.notNull(httpHost, "Host");
          credMap.put(new AuthScope(httpHost), credentials);
          return this;
      }
  
      public CredentialsProviderBuilder add(final HttpHost httpHost, final String username, final char[] password) {
          Args.notNull(httpHost, "Host");
          credMap.put(new AuthScope(httpHost), new UsernamePasswordCredentials(username, password));
          return this;
      }
  
      public CredentialsProvider build() {
          if (credMap.size() == 0) {
              return new BasicCredentialsProvider();
          } else if (credMap.size() == 1) {
              final Map.Entry<AuthScope, Credentials> entry = credMap.entrySet().iterator().next();
              return new SingleCredentialsProvider(entry.getKey(), entry.getValue());
          } else {
              return new FixedCredentialsProvider(credMap);
          }
      }
  
      static class Entry {
  
          final AuthScope authScope;
          final Credentials credentials;
  
          Entry(final AuthScope authScope, final Credentials credentials) {
              this.authScope = authScope;
              this.credentials = credentials;
         }
 
     }
 
 }