/**
 * Copyright 2018-2118 the original author or authors.
 * <p>
 * Licensed 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
 * <p>
 * http://www.apache.org/licenses/LICENSE-2.0
 * <p>
 * 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.vci.dbsync.dbimpl;

import com.vci.dbsync.entity.JobItem;
import com.vci.dbsync.filesync.FileSync;
import com.vci.dbsync.log.SyncLog;
import com.vci.dbsync.DBSync;
import com.vci.dbsync.utils.Tool;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.List;

/**
 * @author liuyazhuang
 * @date 2018/9/11 10:21
 * @description MySQL数据库同步实现
 * @version 1.0.0
 */
public class MySQLSync extends AbstractDBSync implements DBSync {
    //private Logger logger = Logger.getLogger(MySQLSync.class);

    @Override
    public long assembleSQL(JobItem jobItem, Connection srcConn, Connection destConn, FileSync fileSync) throws SQLException {
    	String srcSql = jobItem.getSrcSql();
        String uniqueName = Tool.generateString(6) + "_" + jobItem.getName();
        String[] fields = jobItem.getDestTableFields().split(",");
        fields = this.trimArrayItem(fields);
        String[] updateFields = jobItem.getDestTableUpdate().split(",");
        updateFields = this.trimArrayItem(updateFields);
        String destTable = jobItem.getDestTable();
        String destTableKey = jobItem.getDestTableKey();
        PreparedStatement pst = srcConn.prepareStatement(srcSql);
        ResultSet rs = pst.executeQuery();
        StringBuffer sql = new StringBuffer();
        sql.append("insert into ").append(jobItem.getDestTable()).append(" (").append(jobItem.getDestTableFields()).append(") values ");
        long count = 0;
        
        while (rs.next()) {
            sql.append("(");
            for (int index = 0; index < fields.length; index++) {
                sql.append("'").append(rs.getString(fields[index])).append(index == (fields.length - 1) ? "'" : "',");
            }
            sql.append("),");
            count++;
        }
        
        if (rs != null) {
            rs.close();
        }
        
        if (pst != null) {
            pst.close();
        }
        if (count > 0) {
            sql = sql.deleteCharAt(sql.length() - 1);
            if ((!jobItem.getDestTableUpdate().equals("")) && (!jobItem.getDestTableKey().equals(""))) {
                sql.append(" on duplicate key update ");
                for (int index = 0; index < updateFields.length; index++) {
                    sql.append(updateFields[index]).append("= values(").append(updateFields[index]).append(index == (updateFields.length - 1) ? ")" : "),");
                }
                
                StringBuffer sb = new StringBuffer();
                sb.append("alter table ").append(destTable).append(" add constraint ").append(uniqueName).append(" unique (").append(destTableKey).append(");").append(sql.toString())
                .append(";alter table ").append(destTable).append(" drop index ").append(uniqueName);
                
                //lstSQL.add(sb.toString());
                //return true;//new String[] {sb.toString()};
            }
            SyncLog.logger.debug(sql.toString());
            //lstSQL.add(sql.toString());
            
            //return true;//new String[] {sql.toString()};
        }
        
        return count;
        //return false;//null;
    }

    @Override
    public void executeSQL(List<String> sqls, Connection conn) throws SQLException {
        PreparedStatement pst = conn.prepareStatement("");
        //String[] sqlList = sql.split(";");
        for (int index = 0; index < sqls.size(); index++) {
            pst.addBatch(sqls.get(index));
        }
        pst.executeBatch();
        conn.commit();
        pst.close();
    }
}