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"
    configs2 "xps/cmd/config"
)

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 := configs2.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(configs2.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(configs2.SysTimeLocation)

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

    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 := configs2.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(configs2.DriverName, driveSource)
    if err != nil {
        log.Fatal("dbhelper", "DbInstanceMaster", err)
        return nil
    }

    engine.SetTZLocation(configs2.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 := configs2.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(configs2.DriverName, driveSource)
    if err != nil {
        log.Fatal("dbhelper", "DbInstanceIDServer", err)
        return nil
    }

    engine.SetTZLocation(configs2.SysTimeLocation)
    idDbEngine = engine
    return engine
}