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/*
 * Copyright (c) Microsoft. All rights reserved.
 * Licensed under the MIT license. See LICENSE file in the project root for full license information.
 */

package com.microsoft.azure.iothub.transport.amqps;

import com.microsoft.azure.iothub.Message;
import com.microsoft.azure.iothub.MessageProperty;
import org.apache.qpid.proton.amqp.Binary;
import org.apache.qpid.proton.amqp.messaging.Data;
import org.apache.qpid.proton.amqp.messaging.Properties;
import org.apache.qpid.proton.message.impl.MessageImpl;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.nio.ByteBuffer;
import java.util.Map;

public class AmqpsUtilities {

    /**
     * Converts an AMQPS message to a corresponding IoT Hub message.
     *
     * @param protonMsg the AMQPS message.
     *
     * @return the corresponding IoT Hub message.
     */
    protected static Message protonMessageToMessage(MessageImpl protonMsg){
        Message msg = null;
        if(protonMsg != null)
        {
            Data d = (Data) protonMsg.getBody();
            Binary b = d.getValue();
            byte[] msgBody = new byte[b.getLength()];
            ByteBuffer buffer = b.asByteBuffer();
            buffer.get(msgBody);
            msg = new Message(msgBody);

            Properties properties = protonMsg.getProperties();
            //Call all of the getters for the Proton message Properties and set those properties
            //in the IoT Hub message properties if they exist.
            for (Method m : properties.getClass().getMethods())
            {
                if (m.getName().startsWith("get"))
                {
                    try
                    {
                        String propertyName = Character.toLowerCase(m.getName().charAt(3)) + m.getName().substring(4);
                        Object value = m.invoke(properties);
                        if (value != null && !propertyName.equals("class"))
                        {
                            String val = value.toString();

                            if (MessageProperty.isValidAppProperty(propertyName, val))
                            {
                                msg.setProperty(propertyName, val);
                            }
                        }
                    }
                    catch (IllegalAccessException e)
                    {
                        System.err.println("Attempted to access private or protected member of class during message conversion.");
                    }
                    catch (InvocationTargetException e)
                    {
                        System.err.println("Exception thrown while attempting to get member variable. See: " + e.getMessage());
                    }
                }
            }

            // Setting the user properties
            if (protonMsg.getApplicationProperties() != null)
            {
                Map applicationProperties = protonMsg.getApplicationProperties().getValue();
                for (Map.Entry entry : applicationProperties.entrySet())
                {
                    String propertyKey = entry.getKey();
                    if (!MessageProperty.RESERVED_PROPERTY_NAMES.contains(propertyKey))
                    {
                        msg.setProperty(entry.getKey(), entry.getValue());
                    }
                }
            }
        }

        return msg;
    }
}