package models

import (
	"basic.com/valib/logger.git"
	"github.com/jinzhu/gorm"
	"regexp"
	"strings"
	"time"
)

type DbLogger struct {

}


var SyncTables = []string{ "dbtablepersons", "dbtables" }

const (
	UserEventSizeLimit = 8192
)

func (dbLogger *DbLogger) Print(values ...interface{}) {
	var (
		level	= values[0]
	)
	if level == "sql" {
		msgArr := gorm.LogFormatter(values...)
		sql := msgArr[3].(string)
		sql = strings.TrimPrefix(sql, " ")
		if !strings.HasPrefix(sql, "SELECT") && !strings.HasPrefix(sql, "select") && !strings.Contains(sql, "PRAGMA") && !strings.Contains(sql, "pragma"){
			affected := values[5].(int64)
			if affected > 0 {//执行成功
				//判断操作的是哪张表
				whereIdx := strings.Index(sql, "WHERE")
				sqlWithTable := sql
				if whereIdx > -1{
					sqlWithTable = sql[:whereIdx]
				}
				insertReg := regexp.MustCompile(`^\s*(?i:insert)\s`)//insert
				updateReg := regexp.MustCompile(`^\s*(?i:update)\s`)//update
				delReg := regexp.MustCompile(`^\s*(?i:delete)\s`)//delete

				if insertReg.MatchString(sqlWithTable) {
					logger.Debug("insertRegex match,sql:",sql)
					for _,t :=range SyncTables {
						reg := regexp.MustCompile(`\s+\"?(?i:`+t+`)\"?\s+`)
						if reg.MatchString(sqlWithTable) {

							syncSqlChan <- sql

							if len(sql) > 100 {
								logger.Debug("AgentSync insert matchedTable:",t,",len(Sql):",len(sql))
							} else {
								logger.Debug("AgentSync insert matchedTable:",t,",Sql:",sql)
							}
						}
					}
				} else if updateReg.MatchString(sqlWithTable) || delReg.MatchString(sqlWithTable) {
					logger.Debug("update or delete Regex match,sql:",sql)
					for _,t :=range SyncTables {
						reg := regexp.MustCompile(`\s+\"?(?i:`+t+`)\"?\s+`)
						if reg.MatchString(sqlWithTable) {

							syncSqlChan <- sql

							if len(sql) > 100 {
								logger.Debug("AgentSync update or delete matchedTable:",t,",len(Sql):",len(sql))
							} else {
								logger.Debug("AgentSync update or delete matchedTable:",t,",Sql:",sql)
							}
						}
					}
				}
			} else {
				if len(values) >100 {
					logger.Debug("exec affected=0,dbLogger len(values):",len(values))
				} else {
					logger.Debug("exec affected=0,dbLogger:",values)
				}
			}
		}
	} else {
		logger.Debug("dbLogger level!=sql")
	}
}

var syncSqlChan = make(chan string, 512)
func StartSync() {

	sqlBuf := make([]string, 0)
	ticker := time.NewTicker(3 * time.Second)
	sendSize := 0//serf MaxUserEventSize is 9*1024
	for {
		select {
		case <-ticker.C:
			if len(sqlBuf) >0 {
				syncSql := strings.Join(sqlBuf, "")
				syncSqlEvent(syncSql)

				sqlBuf = append([]string{})
				sendSize = 0
			}
		case sql := <-syncSqlChan:

			if sendSize + len(sql) > UserEventSizeLimit {
				if len(sqlBuf) >0 {
					syncSql := strings.Join(sqlBuf, "")
					syncSqlEvent(syncSql)
					sqlBuf = append([]string{})
				}

				s:=strings.TrimRight(sql,";")
				sqlBuf = append(sqlBuf, s+";")
				sendSize = len(sql)
			} else {
				s:=strings.TrimRight(sql,";")
				sqlBuf = append(sqlBuf,s+";")

				sendSize = sendSize + len(sql)
			}
		}
	}
}

func syncSqlEvent(sql string) {
	//使用softbus同步sql到集群内其他节点
	logger.Debug("syncSqlEvent sql:", sql)
}