//
// Licensed to the Apache Software Foundation (ASF) under one
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// distributed with this work for additional information
// regarding copyright ownership.  The ASF 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
//
//   http://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
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package com.cloud.hypervisor.kvm.resource.wrapper;

import java.util.List;

import org.apache.log4j.Logger;
import org.libvirt.Connect;
import org.libvirt.Domain;
import org.libvirt.LibvirtException;

import com.cloud.agent.api.Answer;
import com.cloud.agent.api.PlugNicAnswer;
import com.cloud.agent.api.PlugNicCommand;
import com.cloud.agent.api.to.NicTO;
import com.cloud.exception.InternalErrorException;
import com.cloud.hypervisor.kvm.resource.LibvirtComputingResource;
import com.cloud.hypervisor.kvm.resource.LibvirtVMDef.InterfaceDef;
import com.cloud.hypervisor.kvm.resource.VifDriver;
import com.cloud.resource.CommandWrapper;
import com.cloud.resource.ResourceWrapper;

@ResourceWrapper(handles =  PlugNicCommand.class)
public final class LibvirtPlugNicCommandWrapper extends CommandWrapper<PlugNicCommand, Answer, LibvirtComputingResource> {

    private static final Logger s_logger = Logger.getLogger(LibvirtPlugNicCommandWrapper.class);

    @Override
    public Answer execute(final PlugNicCommand command, final LibvirtComputingResource libvirtComputingResource) {
        final NicTO nic = command.getNic();
        final String vmName = command.getVmName();
        Domain vm = null;
        try {
            final LibvirtUtilitiesHelper libvirtUtilitiesHelper = libvirtComputingResource.getLibvirtUtilitiesHelper();
            final Connect conn = libvirtUtilitiesHelper.getConnectionByVmName(vmName);
            vm = libvirtComputingResource.getDomain(conn, vmName);

            final List<InterfaceDef> pluggedNics = libvirtComputingResource.getInterfaces(conn, vmName);
            Integer nicnum = 0;
            for (final InterfaceDef pluggedNic : pluggedNics) {
                if (pluggedNic.getMacAddress().equalsIgnoreCase(nic.getMac())) {
                    s_logger.debug("found existing nic for mac " + pluggedNic.getMacAddress() + " at index " + nicnum);
                    return new PlugNicAnswer(command, true, "success");
                }
                nicnum++;
            }
            final VifDriver vifDriver = libvirtComputingResource.getVifDriver(nic.getType());
            final InterfaceDef interfaceDef = vifDriver.plug(nic, "Other PV", "");
            vm.attachDevice(interfaceDef.toString());

            return new PlugNicAnswer(command, true, "success");
        } catch (final LibvirtException e) {
            final String msg = " Plug Nic failed due to " + e.toString();
            s_logger.warn(msg, e);
            return new PlugNicAnswer(command, false, msg);
        } catch (final InternalErrorException e) {
            final String msg = " Plug Nic failed due to " + e.toString();
            s_logger.warn(msg, e);
            return new PlugNicAnswer(command, false, msg);
        } finally {
            if (vm != null) {
                try {
                    vm.free();
                } catch (final LibvirtException l) {
                    s_logger.trace("Ignoring libvirt error.", l);
                }
            }
        }
    }
}