package group

import (
	"errors"
	"github.com/redis/go-redis/v9"
)

var ErrNotExists = errors.New("not exists")

// PostalDao persistent postal group api
// 1.uid online, send online event
// 2.onOnlineEvent: chat -> chat groups to postal, game -> game groups to postal
// 2.postal create  uid create or join memory group linkedList
// 3.postalA: gid-1(uid1, uid2, uid3); postalB: gid1(uid4, uid5, uid6)
// extra: room bit位判断是否存在
type PostalDao interface {
	LoadGroupIdsByUid(uid string) ([]string, error)
	GroupCreate(gid string) (string, error)
	GroupJoin(gid, uid string) error
	GroupLeave(gid, uid string) error
	GroupDismiss(gid string) error
}

type RedisPostalDao struct {
	rdb *redis.Client
}

func (d *RedisPostalDao) LoadGroupIdsByUid(uid string) (gids []string, err error) {
	return
}