// 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.dc.dao;

import java.sql.PreparedStatement;
import java.sql.SQLException;
import java.util.Date;
import java.util.List;

import javax.ejb.Local;

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

import com.cloud.dc.DataCenterIpAddressVO;
import com.cloud.utils.db.DB;
import com.cloud.utils.db.GenericDaoBase;
import com.cloud.utils.db.GenericSearchBuilder;
import com.cloud.utils.db.SearchBuilder;
import com.cloud.utils.db.SearchCriteria;
import com.cloud.utils.db.SearchCriteria.Func;
import com.cloud.utils.db.TransactionLegacy;
import com.cloud.utils.exception.CloudRuntimeException;
import com.cloud.utils.net.NetUtils;

@Component
@Local(value={DataCenterIpAddressDao.class}) @DB
public class DataCenterIpAddressDaoImpl extends GenericDaoBase<DataCenterIpAddressVO, Long> implements DataCenterIpAddressDao {
    private static final Logger s_logger = Logger.getLogger(DataCenterIpAddressDaoImpl.class);
    
    private final SearchBuilder<DataCenterIpAddressVO> AllFieldsSearch;
    private final GenericSearchBuilder<DataCenterIpAddressVO, Integer> AllIpCount;
    private final GenericSearchBuilder<DataCenterIpAddressVO, Integer> AllAllocatedIpCount;
    
    @DB
    public DataCenterIpAddressVO takeIpAddress(long dcId, long podId, long instanceId, String reservationId) {
        SearchCriteria<DataCenterIpAddressVO> sc = AllFieldsSearch.create();
        sc.setParameters("pod", podId);
        sc.setParameters("taken", (Date)null);
        
        TransactionLegacy txn = TransactionLegacy.currentTxn();
        txn.start();
        DataCenterIpAddressVO  vo = lockOneRandomRow(sc, true);
        if (vo == null) {
            txn.rollback();
            return null;
        }
        vo.setTakenAt(new Date());
        vo.setInstanceId(instanceId);
        vo.setReservationId(reservationId);
        update(vo.getId(), vo);
        txn.commit();
        return vo;
    }

    @DB
    public DataCenterIpAddressVO takeDataCenterIpAddress(long dcId, String reservationId) {
        SearchCriteria<DataCenterIpAddressVO> sc = AllFieldsSearch.create();
        sc.setParameters("dc", dcId);
        sc.setParameters("taken", (Date)null);
        
        TransactionLegacy txn = TransactionLegacy.currentTxn();
        txn.start();
        DataCenterIpAddressVO  vo = lockOneRandomRow(sc, true);
        if (vo == null) {
            txn.rollback();
            return null;
        }
        vo.setTakenAt(new Date());
        vo.setReservationId(reservationId);
        update(vo.getId(), vo);
        txn.commit();
        return vo;
    }

    @Override
    public boolean deleteIpAddressByPod(long podId) {
        SearchCriteria<DataCenterIpAddressVO> sc = AllFieldsSearch.create();
        sc.setParameters("pod", podId);
        return remove(sc) > 0;
    }
    
    @Override
    public boolean mark(long dcId, long podId, String ip) {
        SearchCriteria<DataCenterIpAddressVO> sc = AllFieldsSearch.create();
        sc.setParameters("pod", podId);
        sc.setParameters("ipAddress", ip);
        
        DataCenterIpAddressVO vo = createForUpdate();
        vo.setTakenAt(new Date());
        
        return update(vo, sc) >= 1;
    }
    
    @DB
    public void addIpRange(long dcId, long podId, String start, String end) {
        TransactionLegacy txn = TransactionLegacy.currentTxn();
        String insertSql = "INSERT INTO `cloud`.`op_dc_ip_address_alloc` (ip_address, data_center_id, pod_id, mac_address) VALUES (?, ?, ?, (select mac_address from `cloud`.`data_center` where id=?))";
        String updateSql = "UPDATE `cloud`.`data_center` set mac_address = mac_address+1 where id=?";
        PreparedStatement stmt = null;
        
        long startIP = NetUtils.ip2Long(start);
        long endIP = NetUtils.ip2Long(end);
        
        try {
            txn.start();
            
            while (startIP <= endIP) {
                stmt = txn.prepareStatement(insertSql);
                stmt.setString(1, NetUtils.long2Ip(startIP++));
                stmt.setLong(2, dcId);
                stmt.setLong(3, podId);
                stmt.setLong(4, dcId);
                stmt.executeUpdate();
                stmt.close();
                stmt = txn.prepareStatement(updateSql);
                stmt.setLong(1, dcId);
                stmt.executeUpdate();
                stmt.close();
            }
            txn.commit();
        } catch (SQLException ex) {
            throw new CloudRuntimeException("Unable to persist ip address range ", ex);
        } 
    }
    
    public void releaseIpAddress(String ipAddress, long dcId, Long instanceId) {
    	if (s_logger.isDebugEnabled()) {
    		s_logger.debug("Releasing ip address: " + ipAddress + " data center " + dcId);
    	}
        SearchCriteria<DataCenterIpAddressVO> sc = AllFieldsSearch.create();
        sc.setParameters("ip", ipAddress);
        sc.setParameters("dc", dcId);
        sc.setParameters("instance", instanceId);

        DataCenterIpAddressVO vo = createForUpdate();
        
        vo.setTakenAt(null);
        vo.setInstanceId(null);
        vo.setReservationId(null);
        update(vo, sc);
    }
    
    public void releaseIpAddress(long nicId, String reservationId) {
        if (s_logger.isDebugEnabled()) {
            s_logger.debug("Releasing ip address for reservationId=" + reservationId + ", instance=" + nicId);
        }
        SearchCriteria<DataCenterIpAddressVO> sc = AllFieldsSearch.create();
        sc.setParameters("instance", nicId);
        sc.setParameters("reservation", reservationId);
        
        DataCenterIpAddressVO vo = createForUpdate();
        vo.setTakenAt(null);
        vo.setInstanceId(null);
        vo.setReservationId(null);
        update(vo, sc);
    }
    
    public List<DataCenterIpAddressVO> listByPodIdDcId(long podId, long dcId) {
		SearchCriteria<DataCenterIpAddressVO> sc = AllFieldsSearch.create();
		sc.setParameters("pod", podId);
		return listBy(sc);
	}
    
    @Override
    public List<DataCenterIpAddressVO> listByPodIdDcIdIpAddress(long podId, long dcId, String ipAddress) {
    	SearchCriteria<DataCenterIpAddressVO> sc = AllFieldsSearch.create();
		sc.setParameters("pod", podId);
		sc.setParameters("ipAddress", ipAddress);
		return listBy(sc);
    }
    
    @Override
    public int countIPs(long podId, long dcId, boolean onlyCountAllocated) {
        SearchCriteria<Integer> sc;
        if (onlyCountAllocated) { 
            sc = AllAllocatedIpCount.create();
        } else {
            sc = AllIpCount.create();
        }
        
        sc.setParameters("pod", podId);
        List<Integer> count = customSearch(sc, null);
        return count.get(0);
	}
    
    public DataCenterIpAddressDaoImpl() {
        super();
        
        AllFieldsSearch = createSearchBuilder();
        AllFieldsSearch.and("ip", AllFieldsSearch.entity().getIpAddress(), SearchCriteria.Op.EQ);
        AllFieldsSearch.and("dc", AllFieldsSearch.entity().getDataCenterId(), SearchCriteria.Op.EQ);
        AllFieldsSearch.and("pod", AllFieldsSearch.entity().getPodId(), SearchCriteria.Op.EQ);
        AllFieldsSearch.and("instance", AllFieldsSearch.entity().getInstanceId(), SearchCriteria.Op.EQ);
        AllFieldsSearch.and("ipAddress", AllFieldsSearch.entity().getIpAddress(), SearchCriteria.Op.EQ);
        AllFieldsSearch.and("reservation", AllFieldsSearch.entity().getReservationId(), SearchCriteria.Op.EQ);
        AllFieldsSearch.and("taken", AllFieldsSearch.entity().getTakenAt(), SearchCriteria.Op.EQ);
        AllFieldsSearch.done();
        
        AllIpCount = createSearchBuilder(Integer.class);
        AllIpCount.select(null, Func.COUNT, AllIpCount.entity().getId());
        AllIpCount.and("pod", AllIpCount.entity().getPodId(), SearchCriteria.Op.EQ);
        AllIpCount.done();
        
        AllAllocatedIpCount = createSearchBuilder(Integer.class);
        AllAllocatedIpCount.select(null, Func.COUNT, AllAllocatedIpCount.entity().getId());
        AllAllocatedIpCount.and("pod", AllAllocatedIpCount.entity().getPodId(), SearchCriteria.Op.EQ);
        AllAllocatedIpCount.and("removed", AllAllocatedIpCount.entity().getTakenAt(), SearchCriteria.Op.NNULL);
        AllAllocatedIpCount.done();
    }
}