// 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.upgrade.dao;

import java.io.File;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;

import org.apache.log4j.Logger;

import com.cloud.utils.exception.CloudRuntimeException;
import com.cloud.utils.script.Script;

public class Upgrade227to228 implements DbUpgrade {
    final static Logger s_logger = Logger.getLogger(Upgrade227to228.class);

    @Override
    public String[] getUpgradableVersionRange() {
        return new String[] { "2.2.6", "2.2.7"};
    }

    @Override
    public String getUpgradedVersion() {
        return "2.2.8";
    }

    @Override
    public boolean supportsRollingUpgrade() {
        return true;
    }

    @Override
    public File[] getPrepareScripts() {
        String script = Script.findScript("", "db/schema-227to228.sql");
        if (script == null) {
            throw new CloudRuntimeException("Unable to find db/schema-227to228.sql");
        }
        
        return new File[] { new File(script) };
    }

    @Override
    public void performDataMigration(Connection conn) {
        try {
            PreparedStatement pstmt = conn.prepareStatement("select id from data_center");
            ResultSet rs = pstmt.executeQuery();
            while (rs.next()) {
                long dcId = rs.getLong(1);
                pstmt = conn.prepareStatement("select id from host where data_center_id=? and type='SecondaryStorage'");
                pstmt.setLong(1, dcId);
                ResultSet rs1 = pstmt.executeQuery();               
                if (rs1.next()) {
                    long secHostId = rs1.getLong(1);
                    pstmt = conn.prepareStatement("update snapshots set sechost_id=? where data_center_id=?");
                    pstmt.setLong(1, secHostId);
                    pstmt.setLong(2, dcId);
                    pstmt.executeUpdate();                   
                }
            }

            pstmt = conn.prepareStatement("update disk_offering set disk_size = disk_size * 1024 * 1024 where disk_size <= 2 * 1024 * 1024 and disk_size != 0");
            pstmt.executeUpdate(); 
        
        } catch (SQLException e) {
            s_logger.error("Failed to DB migration for multiple secondary storages", e);
            throw new CloudRuntimeException("Failed to DB migration for multiple secondary storages", e);
        }
            
        updateDomainLevelNetworks(conn);
        updateVolumeUsageRecords(conn);
    }

    @Override
    public File[] getCleanupScripts() {
        return null;
    }
    
    private void updateDomainLevelNetworks(Connection conn) {
        s_logger.debug("Updating domain level specific networks...");
        try {
            PreparedStatement pstmt = conn.prepareStatement("SELECT n.id FROM networks n, network_offerings o WHERE n.shared=1 AND o.system_only=0 AND o.id=n.network_offering_id");
            ResultSet rs = pstmt.executeQuery();
            ArrayList<Object[]> networks = new ArrayList<Object[]>();
            while (rs.next()) {
                Object[] network = new Object[10];
                network[0] = rs.getLong(1); // networkId
                networks.add(network);
            }
            rs.close();
            pstmt.close();
            
            for (Object[] network : networks) {
                Long networkId = (Long) network[0];
                pstmt = conn.prepareStatement("SELECT * from domain_network_ref where network_id=?");
                pstmt.setLong(1, networkId);
                rs = pstmt.executeQuery();
                if (rs.next()) {
                    s_logger.debug("Setting network id=" + networkId + " as domain specific shared network");
                    pstmt = conn.prepareStatement("UPDATE networks set is_domain_specific=1 where id=?");
                    pstmt.setLong(1, networkId);
                    pstmt.executeUpdate();
                }
                rs.close();
                pstmt.close();
            }
            
            s_logger.debug("Successfully updated domain level specific networks");
        } catch (SQLException e) {
            s_logger.error("Failed to set domain specific shared networks due to ", e);
            throw new CloudRuntimeException("Failed to set domain specific shared networks due to ", e);
        }
    }
    
    //this method inserts missing volume.delete events (events were missing when vm failed to create)
    private void updateVolumeUsageRecords(Connection conn) {
        try {
            s_logger.debug("Inserting missing usage_event records for destroyed volumes...");
            PreparedStatement pstmt = conn.prepareStatement("select id, account_id, data_center_id, name from volumes where state='Destroy' and id in (select resource_id from usage_event where type='volume.create') and id not in (select resource_id from usage_event where type='volume.delete')");
            ResultSet rs = pstmt.executeQuery();
            while (rs.next()) {
                long volumeId = rs.getLong(1);
                long accountId = rs.getLong(2);
                long zoneId = rs.getLong(3);
                String volumeName = rs.getString(4);
                
                pstmt = conn.prepareStatement("insert into usage_event (type, account_id, created, zone_id, resource_name, resource_id) values ('VOLUME.DELETE', ?, now(), ?, ?, ?)");
                pstmt.setLong(1, accountId);
                pstmt.setLong(2, zoneId);
                pstmt.setString(3, volumeName);
                pstmt.setLong(4, volumeId);
                
                pstmt.executeUpdate(); 
            }
            s_logger.debug("Successfully inserted missing usage_event records for destroyed volumes");
        } catch (SQLException e) {
            s_logger.error("Failed to insert missing delete usage records ", e);
            throw new CloudRuntimeException("Failed to insert missing delete usage records ", e);
        }
    }
}
