/*
 * Copyright (c) 2013 Pantheon Technologies s.r.o. and others. All rights reserved.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v1.0 which accompanies this distribution,
 * and is available at http://www.eclipse.org/legal/epl-v10.html
 */

package org.opendaylight.openflowjava.protocol.impl.deserialization.factories;

import io.netty.buffer.ByteBuf;

import java.util.ArrayList;
import java.util.List;

import org.opendaylight.openflowjava.protocol.api.extensibility.DeserializerRegistry;
import org.opendaylight.openflowjava.protocol.api.extensibility.DeserializerRegistryInjector;
import org.opendaylight.openflowjava.protocol.api.extensibility.OFDeserializer;
import org.opendaylight.openflowjava.protocol.api.util.EncodeConstants;
import org.opendaylight.openflowjava.util.ExperimenterDeserializerKeyFactory;
import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.augments.rev150225.RateQueueProperty;
import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.augments.rev150225.RateQueuePropertyBuilder;
import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.common.types.rev130731.PortNumber;
import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.common.types.rev130731.QueueId;
import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.common.types.rev130731.QueueProperties;
import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.protocol.rev130731.GetQueueConfigOutput;
import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.protocol.rev130731.GetQueueConfigOutputBuilder;
import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.protocol.rev130731.queue.get.config.reply.Queues;
import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.protocol.rev130731.queue.get.config.reply.QueuesBuilder;
import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.protocol.rev130731.queue.property.header.QueueProperty;
import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.protocol.rev130731.queue.property.header.QueuePropertyBuilder;

/**
 * Translates QueueGetConfigReply messages
 * @author timotej.kubas
 * @author michal.polkorab
 */
public class QueueGetConfigReplyMessageFactory implements OFDeserializer<GetQueueConfigOutput>,
        DeserializerRegistryInjector {

    private static final byte PADDING_IN_QUEUE_GET_CONFIG_REPLY_HEADER = 4;
    private static final byte PADDING_IN_PACKET_QUEUE_HEADER = 6;
    private static final byte PADDING_IN_QUEUE_PROPERTY_HEADER = 4;
    private static final int PADDING_IN_RATE_QUEUE_PROPERTY = 6;
    private static final byte PACKET_QUEUE_LENGTH = 16;
    private DeserializerRegistry registry;

    @Override
    public GetQueueConfigOutput deserialize(ByteBuf rawMessage) {
        GetQueueConfigOutputBuilder builder = new GetQueueConfigOutputBuilder();
        builder.setVersion((short) EncodeConstants.OF13_VERSION_ID);
        builder.setXid((rawMessage.readUnsignedInt()));
        builder.setPort(new PortNumber(rawMessage.readUnsignedInt()));
        rawMessage.skipBytes(PADDING_IN_QUEUE_GET_CONFIG_REPLY_HEADER);
        builder.setQueues(createQueuesList(rawMessage));
        return builder.build();
    }

    private List<Queues> createQueuesList(ByteBuf input){
        List<Queues> queuesList = new ArrayList<>();
        while (input.readableBytes() > 0) {
            QueuesBuilder queueBuilder = new QueuesBuilder();
            queueBuilder.setQueueId(new QueueId(input.readUnsignedInt()));
            queueBuilder.setPort(new PortNumber(input.readUnsignedInt()));
            int length = input.readUnsignedShort();
            input.skipBytes(PADDING_IN_PACKET_QUEUE_HEADER);
            queueBuilder.setQueueProperty(createPropertiesList(input, length - PACKET_QUEUE_LENGTH));
            queuesList.add(queueBuilder.build());
        }
        return queuesList;
    }

    private List<QueueProperty> createPropertiesList(ByteBuf input, int length){
        int propertiesLength = length;
        List<QueueProperty> propertiesList = new ArrayList<>();
        while (propertiesLength > 0) {
            int propertyStartIndex = input.readerIndex();
            QueuePropertyBuilder propertiesBuilder = new QueuePropertyBuilder();
            QueueProperties property = QueueProperties.forValue(input.readUnsignedShort());
            propertiesBuilder.setProperty(property);
            int currentPropertyLength = input.readUnsignedShort();
            propertiesLength -= currentPropertyLength;
            input.skipBytes(PADDING_IN_QUEUE_PROPERTY_HEADER);
            if (property.equals(QueueProperties.OFPQTMINRATE) || property.equals(QueueProperties.OFPQTMAXRATE)) {
                RateQueuePropertyBuilder rateBuilder = new RateQueuePropertyBuilder();
                rateBuilder.setRate(input.readUnsignedShort());
                propertiesBuilder.addAugmentation(RateQueueProperty.class, rateBuilder.build());
                input.skipBytes(PADDING_IN_RATE_QUEUE_PROPERTY);
            } else if (property.equals(QueueProperties.OFPQTEXPERIMENTER)) {
                long expId = input.readUnsignedInt();
                input.readerIndex(propertyStartIndex);
                OFDeserializer<QueueProperty> deserializer = registry.getDeserializer(
                        ExperimenterDeserializerKeyFactory.createQueuePropertyDeserializerKey(
                                EncodeConstants.OF13_VERSION_ID, expId));
                propertiesList.add(deserializer.deserialize(input));
                continue;
            }
            propertiesList.add(propertiesBuilder.build());
        }
        return propertiesList;
    }

    @Override
    public void injectDeserializerRegistry(DeserializerRegistry deserializerRegistry) {
        this.registry = deserializerRegistry;
    }
}