package mysql

import (
	"time"

	"git.links123.net/links123.com/skeleton/config"
	"git.links123.net/links123.com/skeleton/service/api"
	"github.com/sirupsen/logrus"
	"upper.io/db.v3/lib/sqlbuilder"
	"upper.io/db.v3/mysql"
)

var (
	session sqlbuilder.Database
)

// Init 初始化数据库
func Init() {
	dbConfig := config.C.DB
	settings := mysql.ConnectionURL{
		Host:     dbConfig.Host,
		Database: dbConfig.Name,
		User:     dbConfig.User,
		Password: dbConfig.Password,
	}

	var err error
	if session, err = mysql.Open(settings); err != nil {
		logrus.WithField("dsn", settings.String()).Info("connect db failed")
		panic(err)
	}

	logrus.WithField("dsn", settings.String()).Info("connect db success")

	session.SetMaxIdleConns(dbConfig.MaxIdleConnections)
	session.SetMaxOpenConns(dbConfig.MaxOpenConnections)

	for {
		if err := session.Ping(); err != nil {
			logrus.Warn("waiting for mysql server start...")
			time.Sleep(3 * time.Second)
			continue
		}

		logrus.Info("connect to mysql successful")

		break
	}

	if config.C.App.Debug {
		session.SetLogging(true)
	}
}

// Close 在程序退出时关闭连接
func Close() {
	if session != nil {
		err := session.Close()
		if err != nil {
			logrus.Errorf("error close mysql connection: %s", err.Error())
			return
		}
	}
	logrus.Info("mysql connection close")
}

func paging(selector sqlbuilder.Selector, cp api.CommonParams) sqlbuilder.Paginator {
	return selector.Paginate(uint(cp.Limit)).Page(uint(cp.Page))
}