/*
 * Copyright (c) 2015 Intel Corp. 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.ovsdb.southbound.transactions.md;

import java.util.Map;
import java.util.Map.Entry;
import org.opendaylight.mdsal.binding.api.ReadWriteTransaction;
import org.opendaylight.mdsal.common.api.LogicalDatastoreType;
import org.opendaylight.ovsdb.lib.message.TableUpdates;
import org.opendaylight.ovsdb.lib.notation.UUID;
import org.opendaylight.ovsdb.lib.schema.DatabaseSchema;
import org.opendaylight.ovsdb.lib.schema.typed.TyperUtils;
import org.opendaylight.ovsdb.schema.openvswitch.Bridge;
import org.opendaylight.ovsdb.schema.openvswitch.Port;
import org.opendaylight.ovsdb.southbound.InstanceIdentifierCodec;
import org.opendaylight.ovsdb.southbound.OvsdbConnectionInstance;
import org.opendaylight.ovsdb.southbound.SouthboundMapper;
import org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.TpId;
import org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.network.topology.topology.node.TerminationPoint;
import org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.network.topology.topology.node.TerminationPointKey;
import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class OvsdbPortRemoveCommand extends AbstractTransactionCommand {
    private static final Logger LOG = LoggerFactory.getLogger(OvsdbPortRemoveCommand.class);

    private final InstanceIdentifierCodec instanceIdentifierCodec;

    public OvsdbPortRemoveCommand(final InstanceIdentifierCodec instanceIdentifierCodec,
            final OvsdbConnectionInstance key, final TableUpdates updates, final DatabaseSchema dbSchema) {
        super(key, updates, dbSchema);
        this.instanceIdentifierCodec = instanceIdentifierCodec;
    }

    @Override
    public void execute(final ReadWriteTransaction transaction) {
        Map<UUID, Port> portRemovedRows = TyperUtils.extractRowsRemoved(
            Port.class, getUpdates(), getDbSchema());
        Map<UUID, Port> portUpdatedRows = TyperUtils.extractRowsUpdated(
                Port.class, getUpdates(), getDbSchema());
        Map<UUID,Bridge> bridgeUpdatedRows = TyperUtils.extractRowsUpdated(
                Bridge.class, getUpdates(), getDbSchema());
        Map<UUID,Bridge> bridgeUpdatedOldRows = TyperUtils.extractRowsOld(
                Bridge.class, getUpdates(), getDbSchema());
        for (Entry<UUID, Port> portRemoved: portRemovedRows.entrySet()) {
            final UUID portUuid = portRemoved.getKey();
            final Port port = portRemoved.getValue();
            final String portName = port.getName();
            boolean isPortInUpdatedRows = portUpdatedRows.values()
                .stream().anyMatch(updatedPort -> portName.equals(updatedPort.getName()));
            if (isPortInUpdatedRows) {
                LOG.debug("port {} present in updated rows, skipping delete", portName);
                continue;
            }
            Bridge bridgeData = null;
            for (Entry<UUID, Bridge> entry : bridgeUpdatedOldRows.entrySet()) {
                UUID bridgeUuid = entry.getKey();
                Bridge oldBridgeData = entry.getValue();
                if (oldBridgeData.getPortsColumn() != null
                        && oldBridgeData.getPortsColumn().getData().contains(port.getUuidColumn().getData())) {
                    // We have a match, try updated bridge rows first...
                    bridgeData = bridgeUpdatedRows.get(bridgeUuid);
                    if (bridgeData == null) {
                        // ... and fall back to old data
                        bridgeData = oldBridgeData;
                    }
                    break;
                }
            }
            if (bridgeData == null) {
                LOG.warn("Bridge not found for port {}", port);
                continue;
            }
            final InstanceIdentifier<TerminationPoint> nodePath = SouthboundMapper.createInstanceIdentifier(
                instanceIdentifierCodec, getOvsdbConnectionInstance(), bridgeData)
                    .child(TerminationPoint.class, new TerminationPointKey(new TpId(portName)));
            transaction.delete(LogicalDatastoreType.OPERATIONAL, nodePath);
            // Remove from OvsdbConnection Instance cache
            getOvsdbConnectionInstance().removePort(portUuid);
            getOvsdbConnectionInstance().removePortInterface(portName);
        }
    }
}