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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;

/**
 * Utility class with factory methods to create different types of MQTT messages.
 *
 * @author netty
 */
public final class MqttMessageFactory {

	public static MqttMessage newMessage(MqttFixedHeader mqttFixedHeader, Object variableHeader, Object payload) {
		switch (mqttFixedHeader.messageType()) {
			case CONNECT:
				return new MqttConnectMessage(
					mqttFixedHeader,
					(MqttConnectVariableHeader) variableHeader,
					(MqttConnectPayload) payload);
			case CONNACK:
				return new MqttConnAckMessage(mqttFixedHeader, (MqttConnAckVariableHeader) variableHeader);
			case SUBSCRIBE:
				return new MqttSubscribeMessage(
					mqttFixedHeader,
					(MqttMessageIdVariableHeader) variableHeader,
					(MqttSubscribePayload) payload);
			case SUBACK:
				return new MqttSubAckMessage(
					mqttFixedHeader,
					(MqttMessageIdVariableHeader) variableHeader,
					(MqttSubAckPayload) payload);
			case UNSUBACK:
				return new MqttUnsubAckMessage(
					mqttFixedHeader,
					(MqttMessageIdVariableHeader) variableHeader,
					(MqttUnsubAckPayload) payload);
			case UNSUBSCRIBE:
				return new MqttUnsubscribeMessage(
					mqttFixedHeader,
					(MqttMessageIdVariableHeader) variableHeader,
					(MqttUnsubscribePayload) payload);
			case PUBLISH:
				return new MqttPublishMessage(
					mqttFixedHeader,
					(MqttPublishVariableHeader) variableHeader,
					(byte[]) payload);
			case PUBACK:
				//Having MqttPubReplyMessageVariableHeader or MqttMessageIdVariableHeader
				return new MqttPubAckMessage(mqttFixedHeader, (MqttMessageIdVariableHeader) variableHeader);
			case PUBREC:
			case PUBREL:
			case PUBCOMP:
				//Having MqttPubReplyMessageVariableHeader or MqttMessageIdVariableHeader
				return new MqttMessage(mqttFixedHeader, variableHeader);
			case PINGREQ:
			case PINGRESP:
				return new MqttMessage(mqttFixedHeader);
			case DISCONNECT:
			case AUTH:
				//Having MqttReasonCodeAndPropertiesVariableHeader
				return new MqttMessage(mqttFixedHeader, variableHeader);
			default:
				throw new IllegalArgumentException("unknown message type: " + mqttFixedHeader.messageType());
		}
	}

	public static MqttMessage newInvalidMessage(Throwable cause) {
		return new MqttMessage(null, null, null, DecoderResult.failure(cause));
	}

	public static MqttMessage newInvalidMessage(MqttFixedHeader mqttFixedHeader, Object variableHeader,
												Throwable cause) {
		return new MqttMessage(mqttFixedHeader, variableHeader, null, DecoderResult.failure(cause));
	}

	private MqttMessageFactory() {
	}
}