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/*
 * Copyright 2014 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 net.dreamlu.iot.mqtt.codec;

/**
 * See 
 * MQTTV3.1/unsuback
 *
 * @author netty
 */
public final class MqttUnsubAckMessage extends MqttMessage {

	public MqttUnsubAckMessage(MqttFixedHeader mqttFixedHeader,
							   MqttMessageIdAndPropertiesVariableHeader variableHeader,
							   MqttUnsubAckPayload payload) {
		super(mqttFixedHeader, variableHeader, MqttUnsubAckPayload.withEmptyDefaults(payload));
	}

	public MqttUnsubAckMessage(MqttFixedHeader mqttFixedHeader,
							   MqttMessageIdVariableHeader variableHeader,
							   MqttUnsubAckPayload payload) {
		this(mqttFixedHeader, fallbackVariableHeader(variableHeader), payload);
	}

	public MqttUnsubAckMessage(MqttFixedHeader mqttFixedHeader,
							   MqttMessageIdVariableHeader variableHeader) {
		this(mqttFixedHeader, variableHeader, null);
	}

	private static MqttMessageIdAndPropertiesVariableHeader fallbackVariableHeader(
		MqttMessageIdVariableHeader variableHeader) {
		if (variableHeader instanceof MqttMessageIdAndPropertiesVariableHeader) {
			return (MqttMessageIdAndPropertiesVariableHeader) variableHeader;
		}
		return new MqttMessageIdAndPropertiesVariableHeader(variableHeader.messageId(), MqttProperties.NO_PROPERTIES);
	}

	@Override
	public MqttMessageIdVariableHeader variableHeader() {
		return (MqttMessageIdVariableHeader) super.variableHeader();
	}

	public MqttMessageIdAndPropertiesVariableHeader idAndPropertiesVariableHeader() {
		return (MqttMessageIdAndPropertiesVariableHeader) super.variableHeader();
	}

	@Override
	public MqttUnsubAckPayload payload() {
		return (MqttUnsubAckPayload) super.payload();
	}
}