package unrelation

import (
	"Open_IM/pkg/common/constant"
	"Open_IM/pkg/common/db/table/unrelation"
	"Open_IM/pkg/proto/sdkws"
	"Open_IM/pkg/utils"
	"context"
	"errors"
	"github.com/go-redis/redis/v8"
	"github.com/gogo/protobuf/sortkeys"
	"go.mongodb.org/mongo-driver/bson/primitive"
	"go.mongodb.org/mongo-driver/mongo"
	"go.mongodb.org/mongo-driver/mongo/options"
	"sync"
	"time"
)

var ErrMsgListNotExist = errors.New("user not have msg in mongoDB")

type MsgMongoDriver struct {
	mgoDB         *mongo.Database
	MsgCollection *mongo.Collection
}

func NewMsgMongoDriver(mgoDB *mongo.Database) *MsgMongoDriver {
	return &MsgMongoDriver{mgoDB: mgoDB, MsgCollection: mgoDB.Collection(unrelation.CChat)}
}

func (m *MsgMongoDriver) FindOneAndUpdate(ctx context.Context, filter, update, output interface{}, opts ...*options.FindOneAndUpdateOptions) error {
	return m.MsgCollection.FindOneAndUpdate(ctx, filter, update, opts...).Decode(output)
}

func (m *MsgMongoDriver) UpdateOne(ctx context.Context, filter, update interface{}, opts ...*options.UpdateOptions) error {
	_, err := m.MsgCollection.UpdateOne(ctx, filter, update, opts...)
	return err
}

// database controller
func (m *MsgMongoDriver) DelMsgBySeqList(ctx context.Context, userID string, seqList []uint32) (totalUnExistSeqList []uint32, err error) {
	sortkeys.Uint32s(seqList)
	suffixUserID2SubSeqList := func(uid string, seqList []uint32) map[string][]uint32 {
		t := make(map[string][]uint32)
		for i := 0; i < len(seqList); i++ {
			seqUid := getSeqUid(uid, seqList[i])
			if value, ok := t[seqUid]; !ok {
				var temp []uint32
				t[seqUid] = append(temp, seqList[i])
			} else {
				t[seqUid] = append(value, seqList[i])
			}
		}
		return t
	}(userID, seqList)
	lock := sync.Mutex{}
	var wg sync.WaitGroup
	wg.Add(len(suffixUserID2SubSeqList))
	for k, v := range suffixUserID2SubSeqList {
		go func(suffixUserID string, subSeqList []uint32) {
			defer wg.Done()
			unexistSeqList, err := m.DelMsgBySeqListInOneDoc(ctx, suffixUserID, subSeqList)
			if err != nil {
				return
			}
			lock.Lock()
			totalUnExistSeqList = append(totalUnExistSeqList, unexistSeqList...)
			lock.Unlock()
		}(k, v)
	}
	return totalUnExistSeqList, nil
}

func (m *MsgMongoDriver) DelMsgBySeqListInOneDoc(ctx context.Context, suffixUserID string, seqList []uint32) ([]uint32, error) {
	seqMsgList, indexList, unexistSeqList, err := m.GetMsgAndIndexBySeqListInOneMongo2(suffixUserID, seqList)
	if err != nil {
		return nil, utils.Wrap(err, "")
	}
	for i, v := range seqMsgList {
		if err := m.ReplaceMsgByIndex(suffixUserID, v, operationID, indexList[i]); err != nil {
			return nil, utils.Wrap(err, "")
		}
	}
	return unexistSeqList, nil
}

// database
func (m *MsgMongoDriver) DelMsgLogic(ctx context.Context, uid string, seqList []uint32) error {
	sortkeys.Uint32s(seqList)
	seqMsgs, err := d.GetMsgBySeqListMongo2(ctx, uid, seqList)
	if err != nil {
		return utils.Wrap(err, "")
	}
	for _, seqMsg := range seqMsgs {
		seqMsg.Status = constant.MsgDeleted
		if err = d.ReplaceMsgBySeq(ctx, uid, seqMsg); err != nil {
			log.NewError(operationID, utils.GetSelfFuncName(), "ReplaceMsgListBySeq error", err.Error())
		}
	}
	return nil
}

// model
func (m *MsgMongoDriver) ReplaceMsgByIndex(ctx context.Context, suffixUserID string, msg *sdkws.MsgData, seqIndex int) error {
	log.NewInfo(operationID, utils.GetSelfFuncName(), suffixUserID, *msg)
	ctx, _ := context.WithTimeout(context.Background(), time.Duration(config.Config.Mongo.DBTimeout)*time.Second)
	c := d.mongoClient.Database(config.Config.Mongo.DBDatabase).Collection(cChat)
	s := fmt.Sprintf("msg.%d.msg", seqIndex)
	log.NewDebug(operationID, utils.GetSelfFuncName(), seqIndex, s)
	msg.Status = constant.MsgDeleted
	bytes, err := proto.Marshal(msg)
	if err != nil {
		log.NewError(operationID, utils.GetSelfFuncName(), "proto marshal failed ", err.Error(), msg.String())
		return utils.Wrap(err, "")
	}
	updateResult, err := c.UpdateOne(ctx, bson.M{"uid": suffixUserID}, bson.M{"$set": bson.M{s: bytes}})
	log.NewInfo(operationID, utils.GetSelfFuncName(), updateResult)
	if err != nil {
		log.NewError(operationID, utils.GetSelfFuncName(), "UpdateOne", err.Error())
		return utils.Wrap(err, "")
	}
	return nil
}

func (d *db.DataBases) ReplaceMsgBySeq(uid string, msg *open_im_sdk.MsgData, operationID string) error {
	log.NewInfo(operationID, utils.GetSelfFuncName(), uid, *msg)
	ctx, _ := context.WithTimeout(context.Background(), time.Duration(config.Config.Mongo.DBTimeout)*time.Second)
	c := d.mongoClient.Database(config.Config.Mongo.DBDatabase).Collection(cChat)
	uid = getSeqUid(uid, msg.Seq)
	seqIndex := getMsgIndex(msg.Seq)
	s := fmt.Sprintf("msg.%d.msg", seqIndex)
	log.NewDebug(operationID, utils.GetSelfFuncName(), seqIndex, s)
	bytes, err := proto.Marshal(msg)
	if err != nil {
		log.NewError(operationID, utils.GetSelfFuncName(), "proto marshal", err.Error())
		return utils.Wrap(err, "")
	}

	updateResult, err := c.UpdateOne(
		ctx, bson.M{"uid": uid},
		bson.M{"$set": bson.M{s: bytes}})
	log.NewInfo(operationID, utils.GetSelfFuncName(), updateResult)
	if err != nil {
		log.NewError(operationID, utils.GetSelfFuncName(), "UpdateOne", err.Error())
		return utils.Wrap(err, "")
	}
	return nil
}

func (d *db.DataBases) UpdateOneMsgList(msg *UserChat) error {
	ctx, _ := context.WithTimeout(context.Background(), time.Duration(config.Config.Mongo.DBTimeout)*time.Second)
	c := d.mongoClient.Database(config.Config.Mongo.DBDatabase).Collection(cChat)
	_, err := c.UpdateOne(ctx, bson.M{"uid": msg.UID}, bson.M{"$set": bson.M{"msg": msg.Msg}})
	return err
}

func (d *db.DataBases) GetMsgBySeqList(uid string, seqList []uint32, operationID string) (seqMsg []*open_im_sdk.MsgData, err error) {
	log.NewInfo(operationID, utils.GetSelfFuncName(), uid, seqList)
	var hasSeqList []uint32
	singleCount := 0
	session := d.mgoSession.Clone()
	if session == nil {
		return nil, errors.New("session == nil")
	}
	defer session.Close()
	c := session.DB(config.Config.Mongo.DBDatabase).C(cChat)
	m := func(uid string, seqList []uint32) map[string][]uint32 {
		t := make(map[string][]uint32)
		for i := 0; i < len(seqList); i++ {
			seqUid := getSeqUid(uid, seqList[i])
			if value, ok := t[seqUid]; !ok {
				var temp []uint32
				t[seqUid] = append(temp, seqList[i])
			} else {
				t[seqUid] = append(value, seqList[i])
			}
		}
		return t
	}(uid, seqList)
	sChat := UserChat{}
	for seqUid, value := range m {
		if err = c.Find(bson.M{"uid": seqUid}).One(&sChat); err != nil {
			log.NewError(operationID, "not find seqUid", seqUid, value, uid, seqList, err.Error())
			continue
		}
		singleCount = 0
		for i := 0; i < len(sChat.Msg); i++ {
			msg := new(open_im_sdk.MsgData)
			if err = proto.Unmarshal(sChat.Msg[i].Msg, msg); err != nil {
				log.NewError(operationID, "Unmarshal err", seqUid, value, uid, seqList, err.Error())
				return nil, err
			}
			if isContainInt32(msg.Seq, value) {
				seqMsg = append(seqMsg, msg)
				hasSeqList = append(hasSeqList, msg.Seq)
				singleCount++
				if singleCount == len(value) {
					break
				}
			}
		}
	}
	if len(hasSeqList) != len(seqList) {
		var diff []uint32
		diff = utils.Difference(hasSeqList, seqList)
		exceptionMSg := genExceptionMessageBySeqList(diff)
		seqMsg = append(seqMsg, exceptionMSg...)

	}
	return seqMsg, nil
}

func (d *db.DataBases) GetUserMsgListByIndex(ID string, index int64) (*UserChat, error) {
	ctx, _ := context.WithTimeout(context.Background(), time.Duration(config.Config.Mongo.DBTimeout)*time.Second)
	c := d.mongoClient.Database(config.Config.Mongo.DBDatabase).Collection(cChat)
	regex := fmt.Sprintf("^%s", ID)
	findOpts := options.Find().SetLimit(1).SetSkip(index).SetSort(bson.M{"uid": 1})
	var msgs []UserChat
	//primitive.Regex{Pattern: regex}
	cursor, err := c.Find(ctx, bson.M{"uid": primitive.Regex{Pattern: regex}}, findOpts)
	if err != nil {
		return nil, utils.Wrap(err, "")
	}
	err = cursor.All(context.Background(), &msgs)
	if err != nil {
		return nil, utils.Wrap(err, fmt.Sprintf("cursor is %s", cursor.Current.String()))
	}
	if len(msgs) > 0 {
		return &msgs[0], nil
	} else {
		return nil, ErrMsgListNotExist
	}
}

func (d *db.DataBases) DelMongoMsgs(IDList []string) error {
	ctx, _ := context.WithTimeout(context.Background(), time.Duration(config.Config.Mongo.DBTimeout)*time.Second)
	c := d.mongoClient.Database(config.Config.Mongo.DBDatabase).Collection(cChat)
	_, err := c.DeleteMany(ctx, bson.M{"uid": bson.M{"$in": IDList}})
	return err
}

func (d *db.DataBases) ReplaceMsgToBlankByIndex(suffixID string, index int) (replaceMaxSeq uint32, err error) {
	ctx, _ := context.WithTimeout(context.Background(), time.Duration(config.Config.Mongo.DBTimeout)*time.Second)
	c := d.mongoClient.Database(config.Config.Mongo.DBDatabase).Collection(cChat)
	userChat := &UserChat{}
	err = c.FindOne(ctx, bson.M{"uid": suffixID}).Decode(&userChat)
	if err != nil {
		return 0, err
	}
	for i, msg := range userChat.Msg {
		if i <= index {
			msgPb := &open_im_sdk.MsgData{}
			if err = proto.Unmarshal(msg.Msg, msgPb); err != nil {
				continue
			}
			newMsgPb := &open_im_sdk.MsgData{Seq: msgPb.Seq}
			bytes, err := proto.Marshal(newMsgPb)
			if err != nil {
				continue
			}
			msg.Msg = bytes
			msg.SendTime = 0
			replaceMaxSeq = msgPb.Seq
		}
	}
	_, err = c.UpdateOne(ctx, bson.M{"uid": suffixID}, bson.M{"$set": bson.M{"msg": userChat.Msg}})
	return replaceMaxSeq, err
}

func (d *db.DataBases) GetNewestMsg(ID string) (msg *open_im_sdk.MsgData, err error) {
	ctx, _ := context.WithTimeout(context.Background(), time.Duration(config.Config.Mongo.DBTimeout)*time.Second)
	c := d.mongoClient.Database(config.Config.Mongo.DBDatabase).Collection(cChat)
	regex := fmt.Sprintf("^%s", ID)
	findOpts := options.Find().SetLimit(1).SetSort(bson.M{"uid": -1})
	var userChats []UserChat
	cursor, err := c.Find(ctx, bson.M{"uid": bson.M{"$regex": regex}}, findOpts)
	if err != nil {
		return nil, err
	}
	err = cursor.All(ctx, &userChats)
	if err != nil {
		return nil, utils.Wrap(err, "")
	}
	if len(userChats) > 0 {
		if len(userChats[0].Msg) > 0 {
			msgPb := &open_im_sdk.MsgData{}
			err = proto.Unmarshal(userChats[0].Msg[len(userChats[0].Msg)-1].Msg, msgPb)
			if err != nil {
				return nil, utils.Wrap(err, "")
			}
			return msgPb, nil
		}
		return nil, errors.New("len(userChats[0].Msg) < 0")
	}
	return nil, nil
}

func (d *db.DataBases) GetOldestMsg(ID string) (msg *open_im_sdk.MsgData, err error) {
	ctx, _ := context.WithTimeout(context.Background(), time.Duration(config.Config.Mongo.DBTimeout)*time.Second)
	c := d.mongoClient.Database(config.Config.Mongo.DBDatabase).Collection(cChat)
	regex := fmt.Sprintf("^%s", ID)
	findOpts := options.Find().SetLimit(1).SetSort(bson.M{"uid": 1})
	var userChats []UserChat
	cursor, err := c.Find(ctx, bson.M{"uid": bson.M{"$regex": regex}}, findOpts)
	if err != nil {
		return nil, err
	}
	err = cursor.All(ctx, &userChats)
	if err != nil {
		return nil, utils.Wrap(err, "")
	}
	var oldestMsg []byte
	if len(userChats) > 0 {
		for _, v := range userChats[0].Msg {
			if v.SendTime != 0 {
				oldestMsg = v.Msg
				break
			}
		}
		if len(oldestMsg) == 0 {
			oldestMsg = userChats[0].Msg[len(userChats[0].Msg)-1].Msg
		}
		msgPb := &open_im_sdk.MsgData{}
		err = proto.Unmarshal(oldestMsg, msgPb)
		if err != nil {
			return nil, utils.Wrap(err, "")
		}
		return msgPb, nil
	}
	return nil, nil
}

func (d *db.DataBases) GetMsgBySeqListMongo2(uid string, seqList []uint32, operationID string) (seqMsg []*open_im_sdk.MsgData, err error) {
	var hasSeqList []uint32
	singleCount := 0
	ctx, _ := context.WithTimeout(context.Background(), time.Duration(config.Config.Mongo.DBTimeout)*time.Second)
	c := d.mongoClient.Database(config.Config.Mongo.DBDatabase).Collection(cChat)

	m := func(uid string, seqList []uint32) map[string][]uint32 {
		t := make(map[string][]uint32)
		for i := 0; i < len(seqList); i++ {
			seqUid := getSeqUid(uid, seqList[i])
			if value, ok := t[seqUid]; !ok {
				var temp []uint32
				t[seqUid] = append(temp, seqList[i])
			} else {
				t[seqUid] = append(value, seqList[i])
			}
		}
		return t
	}(uid, seqList)
	sChat := UserChat{}
	for seqUid, value := range m {
		if err = c.FindOne(ctx, bson.M{"uid": seqUid}).Decode(&sChat); err != nil {
			log.NewError(operationID, "not find seqUid", seqUid, value, uid, seqList, err.Error())
			continue
		}
		singleCount = 0
		for i := 0; i < len(sChat.Msg); i++ {
			msg := new(open_im_sdk.MsgData)
			if err = proto.Unmarshal(sChat.Msg[i].Msg, msg); err != nil {
				log.NewError(operationID, "Unmarshal err", seqUid, value, uid, seqList, err.Error())
				return nil, err
			}
			if isContainInt32(msg.Seq, value) {
				seqMsg = append(seqMsg, msg)
				hasSeqList = append(hasSeqList, msg.Seq)
				singleCount++
				if singleCount == len(value) {
					break
				}
			}
		}
	}
	if len(hasSeqList) != len(seqList) {
		var diff []uint32
		diff = utils.Difference(hasSeqList, seqList)
		exceptionMSg := genExceptionMessageBySeqList(diff)
		seqMsg = append(seqMsg, exceptionMSg...)

	}
	return seqMsg, nil
}
func (d *db.DataBases) GetSuperGroupMsgBySeqListMongo(groupID string, seqList []uint32, operationID string) (seqMsg []*open_im_sdk.MsgData, err error) {
	var hasSeqList []uint32
	singleCount := 0
	ctx, _ := context.WithTimeout(context.Background(), time.Duration(config.Config.Mongo.DBTimeout)*time.Second)
	c := d.mongoClient.Database(config.Config.Mongo.DBDatabase).Collection(cChat)

	m := func(uid string, seqList []uint32) map[string][]uint32 {
		t := make(map[string][]uint32)
		for i := 0; i < len(seqList); i++ {
			seqUid := getSeqUid(uid, seqList[i])
			if value, ok := t[seqUid]; !ok {
				var temp []uint32
				t[seqUid] = append(temp, seqList[i])
			} else {
				t[seqUid] = append(value, seqList[i])
			}
		}
		return t
	}(groupID, seqList)
	sChat := UserChat{}
	for seqUid, value := range m {
		if err = c.FindOne(ctx, bson.M{"uid": seqUid}).Decode(&sChat); err != nil {
			log.NewError(operationID, "not find seqGroupID", seqUid, value, groupID, seqList, err.Error())
			continue
		}
		singleCount = 0
		for i := 0; i < len(sChat.Msg); i++ {
			msg := new(open_im_sdk.MsgData)
			if err = proto.Unmarshal(sChat.Msg[i].Msg, msg); err != nil {
				log.NewError(operationID, "Unmarshal err", seqUid, value, groupID, seqList, err.Error())
				return nil, err
			}
			if isContainInt32(msg.Seq, value) {
				seqMsg = append(seqMsg, msg)
				hasSeqList = append(hasSeqList, msg.Seq)
				singleCount++
				if singleCount == len(value) {
					break
				}
			}
		}
	}
	if len(hasSeqList) != len(seqList) {
		var diff []uint32
		diff = utils.Difference(hasSeqList, seqList)
		exceptionMSg := genExceptionSuperGroupMessageBySeqList(diff, groupID)
		seqMsg = append(seqMsg, exceptionMSg...)

	}
	return seqMsg, nil
}

func (d *db.DataBases) GetMsgAndIndexBySeqListInOneMongo2(suffixUserID string, seqList []uint32, operationID string) (seqMsg []*open_im_sdk.MsgData, indexList []int, unexistSeqList []uint32, err error) {
	ctx, _ := context.WithTimeout(context.Background(), time.Duration(config.Config.Mongo.DBTimeout)*time.Second)
	c := d.mongoClient.Database(config.Config.Mongo.DBDatabase).Collection(cChat)
	sChat := UserChat{}
	if err = c.FindOne(ctx, bson.M{"uid": suffixUserID}).Decode(&sChat); err != nil {
		log.NewError(operationID, "not find seqUid", suffixUserID, err.Error())
		return nil, nil, nil, utils.Wrap(err, "")
	}
	singleCount := 0
	var hasSeqList []uint32
	for i := 0; i < len(sChat.Msg); i++ {
		msg := new(open_im_sdk.MsgData)
		if err = proto.Unmarshal(sChat.Msg[i].Msg, msg); err != nil {
			log.NewError(operationID, "Unmarshal err", msg.String(), err.Error())
			return nil, nil, nil, err
		}
		if isContainInt32(msg.Seq, seqList) {
			indexList = append(indexList, i)
			seqMsg = append(seqMsg, msg)
			hasSeqList = append(hasSeqList, msg.Seq)
			singleCount++
			if singleCount == len(seqList) {
				break
			}
		}
	}
	for _, i := range seqList {
		if isContainInt32(i, hasSeqList) {
			continue
		}
		unexistSeqList = append(unexistSeqList, i)
	}
	return seqMsg, indexList, unexistSeqList, nil
}

func genExceptionMessageBySeqList(seqList []uint32) (exceptionMsg []*open_im_sdk.MsgData) {
	for _, v := range seqList {
		msg := new(open_im_sdk.MsgData)
		msg.Seq = v
		exceptionMsg = append(exceptionMsg, msg)
	}
	return exceptionMsg
}

func genExceptionSuperGroupMessageBySeqList(seqList []uint32, groupID string) (exceptionMsg []*open_im_sdk.MsgData) {
	for _, v := range seqList {
		msg := new(open_im_sdk.MsgData)
		msg.Seq = v
		msg.GroupID = groupID
		msg.SessionType = constant.SuperGroupChatType
		exceptionMsg = append(exceptionMsg, msg)
	}
	return exceptionMsg
}

func (d *db.DataBases) SaveUserChatMongo2(uid string, sendTime int64, m *pbMsg.MsgDataToDB) error {
	ctx, _ := context.WithTimeout(context.Background(), time.Duration(config.Config.Mongo.DBTimeout)*time.Second)
	c := d.mongoClient.Database(config.Config.Mongo.DBDatabase).Collection(cChat)
	newTime := getCurrentTimestampByMill()
	operationID := ""
	seqUid := getSeqUid(uid, m.MsgData.Seq)
	filter := bson.M{"uid": seqUid}
	var err error
	sMsg := MsgInfo{}
	sMsg.SendTime = sendTime
	if sMsg.Msg, err = proto.Marshal(m.MsgData); err != nil {
		return utils.Wrap(err, "")
	}
	err = c.FindOneAndUpdate(ctx, filter, bson.M{"$push": bson.M{"msg": sMsg}}).Err()
	log.NewWarn(operationID, "get mgoSession cost time", getCurrentTimestampByMill()-newTime)
	if err != nil {
		sChat := UserChat{}
		sChat.UID = seqUid
		sChat.Msg = append(sChat.Msg, sMsg)
		if _, err = c.InsertOne(ctx, &sChat); err != nil {
			log.NewDebug(operationID, "InsertOne failed", filter)
			return utils.Wrap(err, "")
		}
	} else {
		log.NewDebug(operationID, "FindOneAndUpdate ok", filter)
	}

	log.NewDebug(operationID, "find mgo uid cost time", getCurrentTimestampByMill()-newTime)
	return nil
}

func (d *db.DataBases) SaveUserChat(uid string, sendTime int64, m *pbMsg.MsgDataToDB) error {
	var seqUid string
	newTime := getCurrentTimestampByMill()
	session := d.mgoSession.Clone()
	if session == nil {
		return errors.New("session == nil")
	}
	defer session.Close()
	log.NewDebug("", "get mgoSession cost time", getCurrentTimestampByMill()-newTime)
	c := session.DB(config.Config.Mongo.DBDatabase).C(cChat)
	seqUid = getSeqUid(uid, m.MsgData.Seq)
	n, err := c.Find(bson.M{"uid": seqUid}).Count()
	if err != nil {
		return err
	}
	log.NewDebug("", "find mgo uid cost time", getCurrentTimestampByMill()-newTime)
	sMsg := MsgInfo{}
	sMsg.SendTime = sendTime
	if sMsg.Msg, err = proto.Marshal(m.MsgData); err != nil {
		return err
	}
	if n == 0 {
		sChat := UserChat{}
		sChat.UID = seqUid
		sChat.Msg = append(sChat.Msg, sMsg)
		err = c.Insert(&sChat)
		if err != nil {
			return err
		}
	} else {
		err = c.Update(bson.M{"uid": seqUid}, bson.M{"$push": bson.M{"msg": sMsg}})
		if err != nil {
			return err
		}
	}
	log.NewDebug("", "insert mgo data cost time", getCurrentTimestampByMill()-newTime)
	return nil
}

func (d *db.DataBases) DelUserChatMongo2(uid string) error {
	ctx, _ := context.WithTimeout(context.Background(), time.Duration(config.Config.Mongo.DBTimeout)*time.Second)
	c := d.mongoClient.Database(config.Config.Mongo.DBDatabase).Collection(cChat)
	filter := bson.M{"uid": uid}

	delTime := time.Now().Unix() - int64(config.Config.Mongo.DBRetainChatRecords)*24*3600
	if _, err := c.UpdateOne(ctx, filter, bson.M{"$pull": bson.M{"msg": bson.M{"sendtime": bson.M{"$lte": delTime}}}}); err != nil {
		return utils.Wrap(err, "")
	}
	return nil
}

func (d *db.DataBases) MgoSkipUID(count int) (string, error) {
	return "", nil
}

func (d *db.DataBases) CleanUpUserMsgFromMongo(userID string, operationID string) error {
	ctx := context.Background()
	c := d.mongoClient.Database(config.Config.Mongo.DBDatabase).Collection(cChat)
	maxSeq, err := d.GetUserMaxSeq(userID)
	if err == redis.Nil {
		return nil
	}
	if err != nil {
		return utils.Wrap(err, "")
	}

	seqUsers := getSeqUserIDList(userID, uint32(maxSeq))
	log.Error(operationID, "getSeqUserIDList", seqUsers)
	_, err = c.DeleteMany(ctx, bson.M{"uid": bson.M{"$in": seqUsers}})
	if err == mongo.ErrNoDocuments {
		return nil
	}
	return utils.Wrap(err, "")
}