package docker_db

import (
	"sync"

	_ "github.com/go-sql-driver/mysql"
	"github.com/pingcap/dbaas/central/config"
	"github.com/pingcap/dbaas/central/dbinit"
	ddb "github.com/pingcap/dbaas/pkg/docker_db/db"
	"github.com/pingcap/dbaas/pkg/docker_db/db/iface"
	"github.com/pingcap/log"

	"go.uber.org/zap"
	"gorm.io/gorm"
	"k8s.io/utils/pointer"
)

var (
	centralDockerDB *iface.DockerDB
	centralDB       *gorm.DB
	centralInited   = false
	lck             sync.Mutex
)

// TryInitCentralDB will start a docker DB and init that database
func TryInitCentralDB(migrate bool) (*gorm.DB, error) {
	config.Global().ServerConfig.ManagementPortalInitUserEmail = pointer.StringPtr("cloud@pingcap.com")
	lck.Lock()
	defer lck.Unlock()

	if centralInited {
		return centralDB, nil
	}

	if err := tryStartGlobalCentralDB(); err != nil {
		return nil, err
	}
	centralDB, err := dbinit.Initialize(config.MysqlConfig{
		User:     "root", // centralDockerDB.User,
		Host:     centralDockerDB.Host,
		Port:     centralDockerDB.Port,
		Password: centralDockerDB.Password,
		Database: "unittest",
	}, migrate)
	if err != nil {
		return nil, err
	}
	centralInited = true
	return centralDB, nil
}

func tryStartGlobalCentralDB() error {
	if centralDockerDB == nil {
		d, err := ddb.BorrowDB()
		if err != nil {
			log.Error("failed to start DB", zap.Error(err))
			return err
		}
		centralDockerDB = d
	}
	return nil
}