/**
 *  Copyright (C) 2010 Cloud.com, Inc.  All rights reserved.
 * 
 * This software is licensed under the GNU General Public License v3 or later.
 * 
 * It is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or any later version.
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 * 
 */

package com.cloud.network.guru;

import java.net.URI;

import javax.ejb.Local;

import org.apache.log4j.Logger;

import com.cloud.configuration.ZoneConfig;
import com.cloud.dc.DataCenter;
import com.cloud.dc.DataCenter.NetworkType;
import com.cloud.dc.DataCenterVO;
import com.cloud.dc.Pod;
import com.cloud.dc.PodVlanMapVO;
import com.cloud.dc.Vlan;
import com.cloud.dc.Vlan.VlanType;
import com.cloud.dc.dao.DataCenterDao;
import com.cloud.dc.dao.PodVlanMapDao;
import com.cloud.dc.dao.VlanDao;
import com.cloud.deploy.DeployDestination;
import com.cloud.exception.ConcurrentOperationException;
import com.cloud.exception.InsufficientAddressCapacityException;
import com.cloud.exception.InsufficientVirtualNetworkCapcityException;
import com.cloud.network.IPAddressVO;
import com.cloud.network.Network;
import com.cloud.network.NetworkManager;
import com.cloud.network.Networks.AddressFormat;
import com.cloud.network.Networks.BroadcastDomainType;
import com.cloud.network.Networks.TrafficType;
import com.cloud.network.addr.PublicIp;
import com.cloud.network.dao.IPAddressDao;
import com.cloud.offering.NetworkOffering;
import com.cloud.offerings.dao.NetworkOfferingDao;
import com.cloud.utils.component.Inject;
import com.cloud.utils.db.DB;
import com.cloud.utils.db.Transaction;
import com.cloud.utils.exception.CloudRuntimeException;
import com.cloud.vm.Nic.ReservationStrategy;
import com.cloud.vm.NicProfile;
import com.cloud.vm.ReservationContext;
import com.cloud.vm.VirtualMachine;
import com.cloud.vm.VirtualMachineProfile;

@Local(value = NetworkGuru.class)
public class DirectPodBasedNetworkGuru extends DirectNetworkGuru {
    private static final Logger s_logger = Logger.getLogger(DirectPodBasedNetworkGuru.class);

    @Inject
    DataCenterDao _dcDao;
    @Inject
    VlanDao _vlanDao;
    @Inject
    NetworkManager _networkMgr;
    @Inject
    IPAddressDao _ipAddressDao;
    @Inject
    NetworkOfferingDao _networkOfferingDao;
    @Inject
    PodVlanMapDao _podVlanDao;

    @Override
    protected boolean canHandle(NetworkOffering offering, DataCenter dc) {
        // this guru handles system Direct pod based network
        if (dc.getNetworkType() == NetworkType.Basic && offering.getTrafficType() == TrafficType.Guest && offering.isSecurityGroupEnabled()) {
            return true;
        } else {
            s_logger.trace("We only take care of Guest Direct Pod based networks");
            return false;
        }
    }

    @Override
    public NicProfile allocate(Network network, NicProfile nic, VirtualMachineProfile<? extends VirtualMachine> vm) throws InsufficientVirtualNetworkCapcityException,
            InsufficientAddressCapacityException, ConcurrentOperationException {

        DataCenterVO dc = _dcDao.findById(network.getDataCenterId());
        ReservationStrategy rsStrategy = ReservationStrategy.Start;
        _dcDao.loadDetails(dc);
        String dhcpStrategy = dc.getDetail(ZoneConfig.DhcpStrategy.key());
        if ("external".equalsIgnoreCase(dhcpStrategy)) {
            rsStrategy = ReservationStrategy.Create;
        }
        NetworkOffering offering = _networkOfferingDao.findByIdIncludingRemoved(network.getNetworkOfferingId());
        
        if (!canHandle(offering, dc)) {
            return null;
        }
        
        if (nic != null && nic.getRequestedIp() != null) {
            throw new CloudRuntimeException("Does not support custom ip allocation at this time: " + nic);
        }
       
        if (nic == null) {
            nic = new NicProfile(rsStrategy, null, null, null, null);
        } else if (nic.getIp4Address() == null) {
            nic.setStrategy(ReservationStrategy.Start);
        } else {
            nic.setStrategy(ReservationStrategy.Create);
        }
        
        if (rsStrategy == ReservationStrategy.Create) {
            String mac = _networkMgr.getNextAvailableMacAddressInNetwork(network.getId());
            nic.setMacAddress(mac);
        }
        return nic;
    }

    @Override @DB
    public void reserve(NicProfile nic, Network network, VirtualMachineProfile<? extends VirtualMachine> vm, DeployDestination dest, ReservationContext context)
            throws InsufficientVirtualNetworkCapcityException, InsufficientAddressCapacityException, ConcurrentOperationException {
        
        String oldIp = nic.getIp4Address();
        boolean getNewIp = false;
        
        if (oldIp == null) {
            getNewIp = true;
        } else {
            // we need to get a new ip address if we try to deploy a vm in a different pod
            IPAddressVO ipVO = _ipAddressDao.findByIpAndSourceNetworkId(network.getId(), oldIp);
            if (ipVO != null) {
                PodVlanMapVO mapVO = _podVlanDao.listPodVlanMapsByVlan(ipVO.getVlanId());
                if (mapVO.getPodId() != dest.getPod().getId()) {
                    Transaction txn = Transaction.currentTxn();
                    txn.start();
                    
                    //release the old ip here
                    _networkMgr.markIpAsUnavailable(ipVO.getId());
                    _ipAddressDao.unassignIpAddress(ipVO.getId());
                    
                    txn.commit();
                    
                    nic.setIp4Address(null);
                    getNewIp = true;
                }
            }
        }
        
        if (getNewIp) {
            //we don't set reservationStrategy to Create because we need this method to be called again for the case when vm fails to deploy in Pod1, and we try to redeploy it in Pod2 
            getIp(nic, dest.getPod(), vm, network);
        }
        
        DataCenter dc = _dcDao.findById(network.getDataCenterId());
        nic.setDns1(dc.getDns1());
        nic.setDns2(dc.getDns2());
    }

    protected void getIp(NicProfile nic, Pod pod, VirtualMachineProfile<? extends VirtualMachine> vm, Network network) throws InsufficientVirtualNetworkCapcityException,
            InsufficientAddressCapacityException, ConcurrentOperationException {
        DataCenter dc = _dcDao.findById(pod.getDataCenterId());
        if (nic.getIp4Address() == null) {
            PublicIp ip = _networkMgr.assignPublicIpAddress(dc.getId(), pod.getId(), vm.getOwner(), VlanType.DirectAttached, network.getId(), null);
            nic.setIp4Address(ip.getAddress().toString());
            nic.setFormat(AddressFormat.Ip4);
            nic.setGateway(ip.getGateway());
            nic.setNetmask(ip.getNetmask());
            if (ip.getVlanTag() != null && ip.getVlanTag().equalsIgnoreCase(Vlan.UNTAGGED)) {
                nic.setIsolationUri(URI.create("ec2://" + Vlan.UNTAGGED));
                nic.setBroadcastUri(URI.create("vlan://" + Vlan.UNTAGGED));
                nic.setBroadcastType(BroadcastDomainType.Native);
            }
            nic.setReservationId(String.valueOf(ip.getVlanTag()));
            nic.setMacAddress(ip.getMacAddress());
        }
        nic.setDns1(dc.getDns1());
        nic.setDns2(dc.getDns2());
    }
    
}