package datasource

import (
	"fmt"
	_ "github.com/go-sql-driver/mysql"
	"log"
	"sync"
	"xorm.io/xorm"
	"xorm.io/xorm/caches"
	log2 "xorm.io/xorm/log"
	"xorm.io/xorm/names"
	"xps/conf"
)

var (
	masterEngine *xorm.Engine
	slaveEngine  *xorm.Engine
	idDbEngine   *xorm.Engine
	lock         sync.Mutex
)

func InstanceMaster() *xorm.Engine {
	if masterEngine != nil {
		return masterEngine
	}

	lock.Lock()
	defer lock.Unlock()

	if masterEngine != nil {
		return masterEngine
	}

	c := conf.MasterDbConfig
	driveSource := fmt.Sprintf("%s:%s@tcp(%s:%d)/%s?charset=utf8",
		c.User, c.Pwd, c.Host, c.Port, c.DbName)

	engine, err := xorm.NewEngine(conf.DriverName, driveSource)
	if err != nil {
		log.Fatal("dbhelper", "DbInstanceMaster", err)
		return nil
	}

	//Debug mode
	engine.ShowSQL(true)
	engine.Logger().SetLevel(log2.LOG_DEBUG)

	//Log
	engine.SetTZLocation(conf.SysTimeLocation)

	//performance
	cacher := caches.NewLRUCacher(caches.NewMemoryStore(), 1000)
	engine.SetDefaultCacher(cacher)

	masterEngine = engine
	return engine
}

// InstanceSlave Slave
func InstanceSlave() *xorm.Engine {
	if slaveEngine != nil {
		return slaveEngine
	}

	lock.Lock()
	defer lock.Unlock()

	if slaveEngine != nil {
		return slaveEngine
	}

	c := conf.SlaveDbConfig
	driveSource := fmt.Sprintf("%s:%s@tcp(%s:%d)/%s?charset=utf8",
		c.User, c.Pwd, c.Host, c.Port, c.DbName)

	engine, err := xorm.NewEngine(conf.DriverName, driveSource)
	if err != nil {
		log.Fatal("dbhelper", "DbInstanceMaster", err)
		return nil
	}

	engine.SetTZLocation(conf.SysTimeLocation)
	engine.SetColumnMapper(names.SnakeMapper{})
	slaveEngine = engine
	return engine
}

// InstanceIDServer Slave
func InstanceIDServer() *xorm.Engine {
	if idDbEngine != nil {
		return idDbEngine
	}

	lock.Lock()
	defer lock.Unlock()

	if idDbEngine != nil {
		return idDbEngine
	}

	c := conf.IDDbConfig
	driveSource := fmt.Sprintf("%s:%s@tcp(%s:%d)/%s?charset=utf8",
		c.User, c.Pwd, c.Host, c.Port, c.DbName)

	engine, err := xorm.NewEngine(conf.DriverName, driveSource)
	if err != nil {
		log.Fatal("dbhelper", "DbInstanceIDServer", err)
		return nil
	}

	engine.SetTZLocation(conf.SysTimeLocation)
	idDbEngine = engine
	return engine
}