/*
    * Copyright 2020 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.netty.handler.codec.mqtt;
  
  import io.netty.util.internal.ObjectUtil;
  import io.netty.util.internal.StringUtil;
  
  import java.util.ArrayList;
  import java.util.Collections;
  import java.util.List;
  
  /**
   * Payload for MQTT unsuback message as in V5.
   */
  public final class MqttUnsubAckPayload {
  
      private final List<MqttReasonCodes.UnsubAck> unsubscribeReasonCodes;
  
      private static final MqttUnsubAckPayload EMPTY = new MqttUnsubAckPayload();
  
      public static MqttUnsubAckPayload withEmptyDefaults(MqttUnsubAckPayload payload) {
          if (payload == null) {
              return EMPTY;
          } else {
              return payload;
          }
      }
  
      public MqttUnsubAckPayload(short... unsubscribeReasonCodes) {
          ObjectUtil.checkNotNull(unsubscribeReasonCodes, "unsubscribeReasonCodes");
  
          List<MqttReasonCodes.UnsubAck> list = new ArrayList<MqttReasonCodes.UnsubAck>(unsubscribeReasonCodes.length);
          for (Short v: unsubscribeReasonCodes) {
              list.add(MqttReasonCodes.UnsubAck.valueOf((byte) (v & 0xFF)));
          }
          this.unsubscribeReasonCodes = Collections.unmodifiableList(list);
      }
  
      public MqttUnsubAckPayload(Iterable<Short> unsubscribeReasonCodes) {
          ObjectUtil.checkNotNull(unsubscribeReasonCodes, "unsubscribeReasonCodes");
  
          List<MqttReasonCodes.UnsubAck> list = new ArrayList<MqttReasonCodes.UnsubAck>();
          for (Short v: unsubscribeReasonCodes) {
              ObjectUtil.checkNotNull(v, "unsubscribeReasonCode");
              list.add(MqttReasonCodes.UnsubAck.valueOf(v.byteValue()));
          }
          this.unsubscribeReasonCodes = Collections.unmodifiableList(list);
      }
  
      public List<Short> unsubscribeReasonCodes() {
          return typedReasonCodesToOrdinal();
      }
  
      private List<Short> typedReasonCodesToOrdinal() {
          List<Short> codes = new ArrayList<Short>(unsubscribeReasonCodes.size());
          for (MqttReasonCodes.UnsubAck code: unsubscribeReasonCodes) {
              codes.add((short) (code.byteValue() & 0xFF));
          }
          return codes;
      }
  
      public List<MqttReasonCodes.UnsubAck> typedReasonCodes() {
          return unsubscribeReasonCodes;
      }
  
      @Override
      public String toString() {
          return new StringBuilder(StringUtil.simpleClassName(this))
                  .append('[')
                  .append("unsubscribeReasonCodes=").append(unsubscribeReasonCodes)
                  .append(']')
                  .toString();
      }
  }