// 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.network.element;

import java.util.HashMap;
import java.util.Map;
import java.util.Set;

import javax.ejb.Local;
import javax.inject.Inject;

import org.apache.log4j.Logger;

import com.cloud.baremetal.ExternalDhcpManager;
import com.cloud.dc.DataCenter;
import com.cloud.dc.DataCenter.NetworkType;
import com.cloud.dc.Pod;
import com.cloud.deploy.DeployDestination;
import com.cloud.exception.ConcurrentOperationException;
import com.cloud.exception.InsufficientCapacityException;
import com.cloud.exception.ResourceUnavailableException;
import com.cloud.host.Host;
import com.cloud.hypervisor.Hypervisor.HypervisorType;
import com.cloud.network.Network;
import com.cloud.network.Network.Capability;
import com.cloud.network.Network.GuestType;
import com.cloud.network.Network.Provider;
import com.cloud.network.Network.Service;
import com.cloud.network.Networks.TrafficType;
import com.cloud.network.PhysicalNetworkServiceProvider;
import com.cloud.offering.NetworkOffering;
import com.cloud.utils.component.AdapterBase;
import com.cloud.vm.NicProfile;
import com.cloud.vm.ReservationContext;
import com.cloud.vm.VirtualMachine;
import com.cloud.vm.VirtualMachineProfile;

@Local(value = NetworkElement.class)
public class ExternalDhcpElement extends AdapterBase implements NetworkElement, DhcpServiceProvider {
    private static final Logger s_logger = Logger.getLogger(ExternalDhcpElement.class);
    @Inject
    ExternalDhcpManager _dhcpMgr;
    private static final Map<Service, Map<Capability, String>> capabilities = setCapabilities();

    private boolean canHandle(DeployDestination dest, TrafficType trafficType, GuestType networkType) {
        DataCenter dc = dest.getDataCenter();
        Pod pod = dest.getPod();

        if ((pod != null && pod.getExternalDhcp()) && dc.getNetworkType() == NetworkType.Basic && trafficType == TrafficType.Guest
                && networkType == Network.GuestType.Shared) {
            s_logger.debug("External DHCP can handle");
            return true;
        }

        return false;
    }

    private static Map<Service, Map<Capability, String>> setCapabilities() {
        // No external dhcp support for Acton release
        Map<Service, Map<Capability, String>> capabilities = new HashMap<Service, Map<Capability, String>>();
        //capabilities.put(Service.Dhcp, null);
        return capabilities;
    }

    @Override
    public Map<Service, Map<Capability, String>> getCapabilities() {
        return capabilities;
    }

    @Override
    public Provider getProvider() {
        return Provider.ExternalDhcpServer;
    }

    @Override
    public boolean implement(Network network, NetworkOffering offering, DeployDestination dest, ReservationContext context)
            throws ConcurrentOperationException, ResourceUnavailableException, InsufficientCapacityException {
        if (!canHandle(dest, offering.getTrafficType(), network.getGuestType())) {
            return false;
        }
        return true;
    }

    @Override
    public boolean prepare(Network network, NicProfile nic, VirtualMachineProfile<? extends VirtualMachine> vm, DeployDestination dest,
            ReservationContext context) throws ConcurrentOperationException, ResourceUnavailableException, InsufficientCapacityException {
        return true;
    }

    @Override
    public boolean release(Network network, NicProfile nic, VirtualMachineProfile<? extends VirtualMachine> vm, ReservationContext context)
            throws ConcurrentOperationException, ResourceUnavailableException {
        return true;
    }

    @Override
    public boolean shutdown(Network network, ReservationContext context, boolean cleanup) throws ConcurrentOperationException, ResourceUnavailableException {
        return true;
    }

    @Override
    public boolean destroy(Network network, ReservationContext context) throws ConcurrentOperationException, ResourceUnavailableException {
        return true;
    }

    @Override
    public boolean isReady(PhysicalNetworkServiceProvider provider) {
        // TODO Auto-generated method stub
        return true;
    }

    @Override
    public boolean shutdownProviderInstances(PhysicalNetworkServiceProvider provider, ReservationContext context) throws ConcurrentOperationException, ResourceUnavailableException {
        // TODO Auto-generated method stub
        return true;
    }

    @Override
    public boolean canEnableIndividualServices() {
        return false;
    }

    @Override
    public boolean addDhcpEntry(Network network, NicProfile nic, VirtualMachineProfile<? extends VirtualMachine> vm, DeployDestination dest, ReservationContext context)
            throws ConcurrentOperationException, InsufficientCapacityException, ResourceUnavailableException {
        Host host = dest.getHost();
        if (host.getHypervisorType() == HypervisorType.BareMetal || !canHandle(dest, network.getTrafficType(), network.getGuestType())) {
            // BareMetalElement or DhcpElement handle this
            return false;
        }
        return _dhcpMgr.addVirtualMachineIntoNetwork(network, nic, vm, dest, context);
    }

    @Override
    public boolean verifyServicesCombination(Set<Service> services) {
        return true;
    }
}