/*
    * ====================================================================
    * 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.core5.http.nio.support;
  
  import java.util.Iterator;
  
  import org.apache.hc.core5.http.ContentType;
  import org.apache.hc.core5.http.Header;
  import org.apache.hc.core5.http.HttpResponse;
  import org.apache.hc.core5.http.ProtocolVersion;
  import org.apache.hc.core5.http.message.BasicHeader;
  import org.apache.hc.core5.http.message.BasicHttpResponse;
  import org.apache.hc.core5.http.message.HeaderGroup;
  import org.apache.hc.core5.http.nio.AsyncEntityProducer;
  import org.apache.hc.core5.http.nio.AsyncResponseProducer;
  import org.apache.hc.core5.http.nio.entity.BasicAsyncEntityProducer;
  import org.apache.hc.core5.util.Args;
  
  /**
   * Builder for {@link AsyncResponseProducer} instances.
   *
   * @since 5.0
   */
  public class AsyncResponseBuilder {
  
      private int status;
      private ProtocolVersion version;
      private HeaderGroup headerGroup;
      private AsyncEntityProducer entityProducer;
  
      AsyncResponseBuilder() {
      }
  
      AsyncResponseBuilder(final int status) {
          super();
          this.status = status;
      }
  
      public static AsyncResponseBuilder create(final int status) {
          Args.checkRange(status, 100, 599, "HTTP status code");
          return new AsyncResponseBuilder(status);
      }
  
      public ProtocolVersion getVersion() {
          return version;
      }
  
      public AsyncResponseBuilder setVersion(final ProtocolVersion version) {
          this.version = version;
          return this;
      }
  
      public Header[] getHeaders(final String name) {
          return headerGroup != null ? headerGroup.getHeaders(name) : null;
      }
  
      public AsyncResponseBuilder setHeaders(final Header... headers) {
          if (headerGroup == null) {
              headerGroup = new HeaderGroup();
          }
          headerGroup.setHeaders(headers);
          return this;
      }
  
      public Header getFirstHeader(final String name) {
          return headerGroup != null ? headerGroup.getFirstHeader(name) : null;
      }
  
      public Header getLastHeader(final String name) {
          return headerGroup != null ? headerGroup.getLastHeader(name) : null;
      }
  
      public AsyncResponseBuilder addHeader(final Header header) {
          if (headerGroup == null) {
             headerGroup = new HeaderGroup();
         }
         headerGroup.addHeader(header);
         return this;
     }
 
     public AsyncResponseBuilder addHeader(final String name, final String value) {
         if (headerGroup == null) {
             headerGroup = new HeaderGroup();
         }
         this.headerGroup.addHeader(new BasicHeader(name, value));
         return this;
     }
 
     public AsyncResponseBuilder removeHeader(final Header header) {
         if (headerGroup == null) {
             headerGroup = new HeaderGroup();
         }
         headerGroup.removeHeader(header);
         return this;
     }
 
     public AsyncResponseBuilder removeHeaders(final String name) {
         if (name == null || headerGroup == null) {
             return this;
         }
         for (final Iterator<Header> i = headerGroup.headerIterator(); i.hasNext(); ) {
             final Header header = i.next();
             if (name.equalsIgnoreCase(header.getName())) {
                 i.remove();
             }
         }
         return this;
     }
 
     public AsyncResponseBuilder setHeader(final Header header) {
         if (headerGroup == null) {
             headerGroup = new HeaderGroup();
         }
         this.headerGroup.setHeader(header);
         return this;
     }
 
     public AsyncResponseBuilder setHeader(final String name, final String value) {
         if (headerGroup == null) {
             headerGroup = new HeaderGroup();
         }
         this.headerGroup.setHeader(new BasicHeader(name, value));
         return this;
     }
 
     public AsyncEntityProducer getEntity() {
         return entityProducer;
     }
 
     public AsyncResponseBuilder setEntity(final AsyncEntityProducer entityProducer) {
         this.entityProducer = entityProducer;
         return this;
     }
 
     public AsyncResponseBuilder setEntity(final String content, final ContentType contentType) {
         this.entityProducer = new BasicAsyncEntityProducer(content, contentType);
         return this;
     }
 
     public AsyncResponseBuilder setEntity(final String content) {
         this.entityProducer = new BasicAsyncEntityProducer(content);
         return this;
     }
 
     public AsyncResponseBuilder setEntity(final byte[] content, final ContentType contentType) {
         this.entityProducer = new BasicAsyncEntityProducer(content, contentType);
         return this;
     }
 
     public AsyncResponseProducer build() {
         final HttpResponse response = new BasicHttpResponse(status);
         if (this.headerGroup != null) {
             response.setHeaders(this.headerGroup.getHeaders());
         }
         if (version != null) {
             response.setVersion(version);
         }
         return new BasicResponseProducer(response, entityProducer);
     }
 
     @Override
     public String toString() {
         final StringBuilder builder = new StringBuilder();
         builder.append("AsyncResponseBuilder [method=");
         builder.append(status);
         builder.append(", status=");
         builder.append(status);
         builder.append(", version=");
         builder.append(version);
         builder.append(", headerGroup=");
         builder.append(headerGroup);
         builder.append(", entity=");
         builder.append(entityProducer != null ? entityProducer.getClass() : null);
         builder.append("]");
         return builder.toString();
     }
 
 }