/*
    * Copyright 2015 The Netty Project
    *
    * The Netty Project 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:
    *
    *   https://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.
   */
  package io.netty5.handler.codec.dns;
  
  import io.netty5.buffer.api.Buffer;
  import io.netty5.util.Send;
  import io.netty5.util.internal.StringUtil;
  import io.netty5.util.internal.UnstableApi;
  
  import static java.util.Objects.requireNonNull;
  
  /**
   * The default {@code DnsRawRecord} implementation.
   */
  @UnstableApi
  public class DefaultDnsRawRecord extends AbstractDnsRecord implements DnsRawRecord {
  
      private final Buffer content;
  
      /**
       * Creates a new {@link #CLASS_IN IN-class} record.
       *
       * @param name the domain name
       * @param type the type of the record
       * @param timeToLive the TTL value of the record
       */
      public DefaultDnsRawRecord(String name, DnsRecordType type, long timeToLive, Buffer content) {
          this(name, type, DnsRecord.CLASS_IN, timeToLive, content);
      }
  
      /**
       * Creates a new record.
       *
       * @param name the domain name
       * @param type the type of the record
       * @param dnsClass the class of the record, usually one of the following:
       *                 <ul>
       *                     <li>{@link #CLASS_IN}</li>
       *                     <li>{@link #CLASS_CSNET}</li>
       *                     <li>{@link #CLASS_CHAOS}</li>
       *                     <li>{@link #CLASS_HESIOD}</li>
       *                     <li>{@link #CLASS_NONE}</li>
       *                     <li>{@link #CLASS_ANY}</li>
       *                 </ul>
       * @param timeToLive the TTL value of the record
       */
      public DefaultDnsRawRecord(
              String name, DnsRecordType type, int dnsClass, long timeToLive, Buffer content) {
          super(name, type, dnsClass, timeToLive);
          this.content = requireNonNull(content, "content").makeReadOnly();
      }
  
      public DefaultDnsRawRecord(
              String name, DnsRecordType type, int dnsClass, long timeToLive, Send<Buffer> content) {
          super(name, type, dnsClass, timeToLive);
          this.content = requireNonNull(content, "content").receive().makeReadOnly();
      }
  
      @Override
      public Buffer content() {
          return content;
      }
  
      public DnsRawRecord replace(Buffer content) {
          return new DefaultDnsRawRecord(name(), type(), dnsClass(), timeToLive(), content);
      }
  
      @Override
      public Send<DnsRawRecord> send() {
          return content.send().map(DnsRawRecord.class, this::replace);
      }
  
      @Override
      public void close() {
          content.close();
      }
  
      @Override
      public boolean isAccessible() {
          return content.isAccessible();
      }
  
      @Override
      public DnsRawRecord touch(Object hint) {
          content.touch(hint);
          return this;
     }
 
     @Override
     public String toString() {
         final StringBuilder buf = new StringBuilder(64).append(StringUtil.simpleClassName(this)).append('(');
         final DnsRecordType type = type();
         if (type != DnsRecordType.OPT) {
             buf.append(name().isEmpty()? "<root>" : name())
                .append(' ')
                .append(timeToLive())
                .append(' ');
 
             DnsMessageUtil.appendRecordClass(buf, dnsClass())
                           .append(' ')
                           .append(type.name());
         } else {
             buf.append("OPT flags:")
                .append(timeToLive())
                .append(" udp:")
                .append(dnsClass());
         }
 
         buf.append(' ')
            .append(content().readableBytes())
            .append("B)");
 
         return buf.toString();
     }
 
     @Override
     public DnsRawRecord copy() {
         // We're required to copy here, because we need independent life-time for 'content'.
         return new DefaultDnsRawRecord(name(), type(), dnsClass(), timeToLive(), content.copy(true));
     }
 }