// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements.  See the NOTICE file
// 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
// under the License.
package com.cloud.vm;

import java.net.URI;
import java.util.Date;
import java.util.List;
import java.util.Set;

import org.apache.cloudstack.api.Identity;
import org.apache.cloudstack.api.InternalIdentity;

import com.cloud.network.Networks.AddressFormat;
import com.cloud.network.Networks.Mode;
import com.cloud.utils.fsm.FiniteState;
import com.cloud.utils.fsm.StateMachine;

/**
 * Nic represents one nic on the VM.
 */
public interface Nic extends Identity, InternalIdentity {

    interface Topics {
        String NIC_LIFECYCLE = "nic.lifecycle";
    }

    enum Event {
        ReservationRequested, ReleaseRequested, CancelRequested, OperationCompleted, OperationFailed,
    }

    public enum State implements FiniteState<State, Event> {
        Allocated("Resource is allocated but not reserved"), Reserving("Resource is being reserved right now"), Reserved("Resource has been reserved."), Releasing(
                "Resource is being released"), Deallocating("Resource is being deallocated");

        String _description;

        @Override
        public StateMachine<State, Event> getStateMachine() {
            return s_fsm;
        }

        @Override
        public State getNextState(Event event) {
            return s_fsm.getNextState(this, event);
        }

        @Override
        public List<State> getFromStates(Event event) {
            return s_fsm.getFromStates(this, event);
        }

        @Override
        public Set<Event> getPossibleEvents() {
            return s_fsm.getPossibleEvents(this);
        }

        private State(String description) {
            _description = description;
        }

        @Override
        public String getDescription() {
            return _description;
        }

        final static private StateMachine<State, Event> s_fsm = new StateMachine<State, Event>();
        static {
            s_fsm.addTransition(State.Allocated, Event.ReservationRequested, State.Reserving);
            s_fsm.addTransition(State.Reserving, Event.CancelRequested, State.Allocated);
            s_fsm.addTransition(State.Reserving, Event.OperationCompleted, State.Reserved);
            s_fsm.addTransition(State.Reserving, Event.OperationFailed, State.Allocated);
            s_fsm.addTransition(State.Reserved, Event.ReleaseRequested, State.Releasing);
            s_fsm.addTransition(State.Releasing, Event.OperationCompleted, State.Allocated);
            s_fsm.addTransition(State.Releasing, Event.OperationFailed, State.Reserved);
        }
    }

    public enum ReservationStrategy {
        PlaceHolder, Create, Start, Managed;
    }

    /**
     * @return reservation id returned by the allocation source. This can be the String version of the database id if
     *         the
     *         allocation source does not need it's own implementation of the reservation id. This is passed back to the
     *         allocation source to release the resource.
     */
    String getReservationId();

    /**
     * @return unique name for the allocation source.
     */
    String getReserver();

    /**
     * @return the time a reservation request was made to the allocation source.
     */
    Date getUpdateTime();

    /**
     * @return the reservation state of the resource.
     */
    State getState();

    ReservationStrategy getReservationStrategy();

    boolean isDefaultNic();

    String getMacAddress();

    /**
     * @return network profile id that this
     */
    long getNetworkId();

    /**
     * @return the vm instance id that this nic belongs to.
     */
    long getInstanceId();

    int getDeviceId();

    Mode getMode();

    URI getIsolationUri();

    URI getBroadcastUri();

    VirtualMachine.Type getVmType();

    AddressFormat getAddressFormat();

    boolean getSecondaryIp();

    //
    // IPv4
    //

    String getIPv4Address();

    String getIPv4Netmask();

    String getIPv4Gateway();

    //
    // IPv6
    //

    String getIPv6Gateway();

    String getIPv6Cidr();

    String getIPv6Address();

    Integer getMtu();

    boolean isEnabled();
}