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// 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
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package com.cloud.hypervisor.kvm.resource.wrapper;

import org.libvirt.Connect;
import org.libvirt.Domain;
import org.libvirt.DomainInfo;
import org.libvirt.LibvirtException;

import com.cloud.agent.api.Answer;
import com.cloud.agent.api.CheckVirtualMachineAnswer;
import com.cloud.agent.api.CheckVirtualMachineCommand;
import com.cloud.hypervisor.kvm.resource.LibvirtComputingResource;
import com.cloud.resource.CommandWrapper;
import com.cloud.resource.ResourceWrapper;
import com.cloud.vm.VirtualMachine.PowerState;

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

    @Override
    public Answer execute(final CheckVirtualMachineCommand command, final LibvirtComputingResource libvirtComputingResource) {
        try {
            final LibvirtUtilitiesHelper libvirtUtilitiesHelper = libvirtComputingResource.getLibvirtUtilitiesHelper();

            final Connect conn = libvirtUtilitiesHelper.getConnectionByVmName(command.getVmName());
            final PowerState state = libvirtComputingResource.getVmState(conn, command.getVmName());
            Integer vncPort = null;
            if (state == PowerState.PowerOn) {
                vncPort = libvirtComputingResource.getVncPort(conn, command.getVmName());
                Domain vm = conn.domainLookupByName(command.getVmName());
                if (DomainInfo.DomainState.VIR_DOMAIN_PAUSED.equals(vm.getInfo().state)) {
                    return new CheckVirtualMachineAnswer(command, PowerState.PowerUnknown, vncPort);
                }
            }

            return new CheckVirtualMachineAnswer(command, state, vncPort);
        } catch (final LibvirtException e) {
            return new CheckVirtualMachineAnswer(command, e.getMessage());
        }
    }
}
