package db

import (
	"encoding/hex"
	"fmt"
	"mtp2_if/config"
	"mtp2_if/logger"
	"mtp2_if/packet"

	"github.com/xormplus/core"
	"github.com/xormplus/xorm"
	"github.com/xormplus/xorm/log"
)

// MySQLEngine MySQL Engine
var MySQLEngine *xorm.Engine

// InitMySQLDbEngine 创建数据库驱动
func InitMySQLDbEngine() error {
	host := config.SerCfg.GetMySQLHost()
	port := config.SerCfg.GetMySQLPort()
	dbname := config.SerCfg.GetMySQLDBName()
	username := config.SerCfg.GetMySQLUsername()
	password := config.SerCfg.GetMySQLPassword()

	// 尝试解密
	var dbUser []byte
	ciphertext, _ := hex.DecodeString(username)
	if len(ciphertext) > 8 {
		ciphertext = ciphertext[4 : len(ciphertext)-8]
		dbUser, _ = packet.Decrypt(ciphertext, packet.AESKey, true)
		if dbUser == nil {
			dbUser = []byte(username)
		}
	} else {
		dbUser = []byte(username)
	}
	var dbPwd []byte
	ciphertext, _ = hex.DecodeString(password)
	if len(ciphertext) > 8 {
		ciphertext = ciphertext[4 : len(ciphertext)-8]
		dbPwd, _ = packet.Decrypt(ciphertext, packet.AESKey, true)
		if dbPwd == nil {
			dbPwd = []byte(password)
		}
	} else {
		dbPwd = []byte(password)
	}

	dataSourceName := fmt.Sprintf("%s:%s@(%s:%d)/%s?charset=utf8", string(dbUser), string(dbPwd), host, port, dbname)

	var err error
	MySQLEngine, err = xorm.NewEngine("mysql", dataSourceName)
	if err != nil {
		fmt.Println("create mysql engine failed:", err)
		return err
	}

	Engine.SetMaxIdleConns(10)
	Engine.SetMaxOpenConns(100)

	if config.SerCfg.GetDebugMode() {
		// 将SQL写到日志文件
		logger := log.NewSimpleLogger(logger.GetLogWriter())
		MySQLEngine.SetLogger(logger)
		// 将SQL打印到Console
		MySQLEngine.ShowSQL(true)
		MySQLEngine.SetTableMapper(core.SameMapper{})
	} else {
		MySQLEngine.ShowSQL(false)
	}

	return nil
}

// GetMySQLEngine GetMySQLEngine
func GetMySQLEngine() *xorm.Engine {
	return MySQLEngine
}

// CloseMySQL CloseMySQL
func CloseMySQL() {
	MySQLEngine.Close()
}