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// 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
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// specific language governing permissions and limitations
// under the License.
package com.cloud.network.dao;

import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.util.ArrayList;
import java.util.List;

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

import org.apache.log4j.Logger;
import org.springframework.stereotype.Component;

import com.cloud.network.rules.FirewallRule.State;
import com.cloud.utils.db.GenericDaoBase;
import com.cloud.utils.db.SearchBuilder;
import com.cloud.utils.db.SearchCriteria;
import com.cloud.utils.db.SearchCriteria.Op;
import com.cloud.utils.db.Transaction;

@Component
@Local(value = { LoadBalancerDao.class })
public class LoadBalancerDaoImpl extends GenericDaoBase<LoadBalancerVO, Long> implements LoadBalancerDao {
    private static final Logger s_logger = Logger.getLogger(LoadBalancerDaoImpl.class);
    private static final String LIST_INSTANCES_BY_LOAD_BALANCER = "SELECT vm.id " +
            "    FROM vm_instance vm, load_balancer lb, ip_forwarding fwd, user_ip_address ip " +
            "    WHERE lb.id = ? AND " +
            "          fwd.group_id = lb.id AND " +
            "          fwd.forwarding = 0 AND " +
            "          fwd.private_ip_address = vm.private_ip_address AND " +
            "          lb.ip_address = ip.public_ip_address AND " +
            "          ip.data_center_id = vm.data_center_id ";
    private final SearchBuilder<LoadBalancerVO> ListByIp;
    private final SearchBuilder<LoadBalancerVO> IpAndPublicPortSearch;
    private final SearchBuilder<LoadBalancerVO> AccountAndNameSearch;
    protected final SearchBuilder<LoadBalancerVO> TransitionStateSearch;

    @Inject protected FirewallRulesCidrsDaoImpl _portForwardingRulesCidrsDao;

    protected LoadBalancerDaoImpl() {
        ListByIp = createSearchBuilder();
        ListByIp.and("ipAddressId", ListByIp.entity().getSourceIpAddressId(), SearchCriteria.Op.EQ);
        ListByIp.and("networkId", ListByIp.entity().getNetworkId(), SearchCriteria.Op.EQ);
        ListByIp.done();

        IpAndPublicPortSearch = createSearchBuilder();
        IpAndPublicPortSearch.and("ipAddressId", IpAndPublicPortSearch.entity().getSourceIpAddressId(), SearchCriteria.Op.EQ);
        IpAndPublicPortSearch.and("publicPort", IpAndPublicPortSearch.entity().getSourcePortStart(), SearchCriteria.Op.EQ);
        IpAndPublicPortSearch.done();

        AccountAndNameSearch = createSearchBuilder();
        AccountAndNameSearch.and("accountId", AccountAndNameSearch.entity().getAccountId(), SearchCriteria.Op.EQ);
        AccountAndNameSearch.and("name", AccountAndNameSearch.entity().getName(), SearchCriteria.Op.EQ);
        AccountAndNameSearch.done();

        TransitionStateSearch = createSearchBuilder();
        TransitionStateSearch.and("networkId", TransitionStateSearch.entity().getNetworkId(), Op.EQ);
        TransitionStateSearch.and("state", TransitionStateSearch.entity().getState(), Op.IN);
        TransitionStateSearch.done();
    }

    @Override
    public List<Long> listInstancesByLoadBalancer(long loadBalancerId) {
        Transaction txn = Transaction.currentTxn();
        String sql = LIST_INSTANCES_BY_LOAD_BALANCER;
        PreparedStatement pstmt = null;
        List<Long> instanceList = new ArrayList<Long>();
        try {
            pstmt = txn.prepareAutoCloseStatement(sql);
            pstmt.setLong(1, loadBalancerId);

            ResultSet rs = pstmt.executeQuery();
            while (rs.next()) {
                Long vmId = rs.getLong(1);
                instanceList.add(vmId);
            }
        } catch (Exception ex) {
            s_logger.error("error getting recent usage network stats", ex);
        }
        return instanceList;
    }

    @Override
    public List<LoadBalancerVO> listByIpAddress(long ipAddressId) {
        SearchCriteria<LoadBalancerVO> sc = ListByIp.create();
        sc.setParameters("ipAddressId", ipAddressId);
        return listBy(sc);
    }

    @Override
    public List<LoadBalancerVO> listByNetworkId(long networkId) {
        SearchCriteria<LoadBalancerVO> sc = ListByIp.create();
        sc.setParameters("networkId", networkId);
        return listBy(sc);
    }

    @Override
    public LoadBalancerVO findByIpAddressAndPublicPort(long ipAddressId, String publicPort) {
        SearchCriteria<LoadBalancerVO> sc = IpAndPublicPortSearch.create();
        sc.setParameters("ipAddressId", ipAddressId);
        sc.setParameters("publicPort", publicPort);
        return findOneBy(sc);
    }

    @Override
    public LoadBalancerVO findByAccountAndName(Long accountId, String name) {
        SearchCriteria<LoadBalancerVO> sc = AccountAndNameSearch.create();
        sc.setParameters("accountId", accountId);
        sc.setParameters("name", name);
        return findOneBy(sc);
    }

    @Override
    public List<LoadBalancerVO> listInTransitionStateByNetworkId(long networkId) {
        SearchCriteria<LoadBalancerVO> sc = TransitionStateSearch.create();
        sc.setParameters("networkId", networkId);
        sc.setParameters("state", State.Add.toString(), State.Revoke.toString());
        return listBy(sc);
    }

}