package msggateway

import (
	"context"
	"github.com/openimsdk/open-im-server/v3/pkg/common/storage/cache/cachekey"
	"github.com/openimsdk/open-im-server/v3/pkg/util/useronline"
	"github.com/openimsdk/tools/log"
	"github.com/openimsdk/tools/mcontext"
	"github.com/redis/go-redis/v9"
	"math/rand"
	"strconv"
)

func (ws *WsServer) SubscriberUserOnlineStatusChanges(rdb redis.UniversalClient) {
	ctx := mcontext.SetOperationID(context.Background(), cachekey.OnlineChannel+strconv.FormatUint(rand.Uint64(), 10))
	for message := range rdb.Subscribe(ctx, cachekey.OnlineChannel).Channel() {
		userID, platformIDs, err := useronline.ParseUserOnlineStatus(message.Payload)
		if err != nil {
			log.ZError(ctx, "OnlineCache redis subscribe parseUserOnlineStatus", err, "payload", message.Payload, "channel", message.Channel)
			continue
		}
		if ws.clients.RecvSubChange(userID, platformIDs) {
			log.ZDebug(ctx, "gateway receive subscription message and go back online", "userID", userID, "platformIDs", platformIDs)
		} else {
			log.ZDebug(ctx, "gateway ignore user online status changes", "userID", userID, "platformIDs", platformIDs)
		}
	}
}

//import (
//	"context"
//	"encoding/json"
//	"github.com/openimsdk/protocol/constant"
//	"github.com/openimsdk/protocol/sdkws"
//	"github.com/openimsdk/tools/log"
//	"github.com/openimsdk/tools/utils/datautil"
//	"github.com/openimsdk/tools/utils/idutil"
//	"sync"
//	"time"
//)
//
//type subClient struct {
//	clients map[string]*Client
//}
//
//func newSubscription() *Subscription {
//	return &Subscription{
//		userIDs: make(map[string]*subClient),
//	}
//}
//
//type Subscription struct {
//	lock    sync.RWMutex
//	userIDs map[string]*subClient
//}
//
//func (s *Subscription) GetClient(userID string) []*Client {
//	s.lock.RLock()
//	defer s.lock.RUnlock()
//	cs, ok := s.userIDs[userID]
//	if !ok {
//		return nil
//	}
//	clients := make([]*Client, 0, len(cs.clients))
//	for _, client := range cs.clients {
//		clients = append(clients, client)
//	}
//	return clients
//}
//
//func (s *Subscription) DelClient(client *Client) {
//	client.subLock.Lock()
//	userIDs := datautil.Keys(client.subUserIDs)
//	for _, userID := range userIDs {
//		delete(client.subUserIDs, userID)
//	}
//	client.subLock.Unlock()
//	if len(userIDs) == 0 {
//		return
//	}
//	addr := client.ctx.GetRemoteAddr()
//	s.lock.Lock()
//	defer s.lock.Unlock()
//	for _, userID := range userIDs {
//		sub, ok := s.userIDs[userID]
//		if !ok {
//			continue
//		}
//		delete(sub.clients, addr)
//		if len(sub.clients) == 0 {
//			delete(s.userIDs, userID)
//		}
//	}
//}
//
//func (s *Subscription) Sub(client *Client, addUserIDs, delUserIDs []string) {
//	if len(addUserIDs)+len(delUserIDs) == 0 {
//		return
//	}
//	var (
//		del = make(map[string]struct{})
//		add = make(map[string]struct{})
//	)
//	client.subLock.Lock()
//	for _, userID := range delUserIDs {
//		if _, ok := client.subUserIDs[userID]; !ok {
//			continue
//		}
//		del[userID] = struct{}{}
//		delete(client.subUserIDs, userID)
//	}
//	for _, userID := range addUserIDs {
//		delete(del, userID)
//		if _, ok := client.subUserIDs[userID]; ok {
//			continue
//		}
//		client.subUserIDs[userID] = struct{}{}
//	}
//	client.subLock.Unlock()
//	if len(del)+len(add) == 0 {
//		return
//	}
//	addr := client.ctx.GetRemoteAddr()
//	s.lock.Lock()
//	defer s.lock.Unlock()
//	for userID := range del {
//		sub, ok := s.userIDs[userID]
//		if !ok {
//			continue
//		}
//		delete(sub.clients, addr)
//		if len(sub.clients) == 0 {
//			delete(s.userIDs, userID)
//		}
//	}
//	for userID := range add {
//		sub, ok := s.userIDs[userID]
//		if !ok {
//			sub = &subClient{clients: make(map[string]*Client)}
//			s.userIDs[userID] = sub
//		}
//		sub.clients[addr] = client
//	}
//}
//
//func (ws *WsServer) pushUserIDOnlineStatus(ctx context.Context, userID string, platformIDs []int32) {
//	clients := ws.subscription.GetClient(userID)
//	if len(clients) == 0 {
//		return
//	}
//	msgContent, err := json.Marshal(platformIDs)
//	if err != nil {
//		log.ZError(ctx, "pushUserIDOnlineStatus json.Marshal", err)
//		return
//	}
//	now := time.Now().UnixMilli()
//	msgID := idutil.GetMsgIDByMD5(userID)
//	msg := &sdkws.MsgData{
//		SendID:           userID,
//		ClientMsgID:      msgID,
//		ServerMsgID:      msgID,
//		SenderPlatformID: constant.AdminPlatformID,
//		SessionType:      constant.NotificationChatType,
//		ContentType:      constant.UserSubscribeOnlineStatusNotification,
//		Content:          msgContent,
//		SendTime:         now,
//		CreateTime:       now,
//	}
//	for _, client := range clients {
//		msg.RecvID = client.UserID
//		if err := client.PushMessage(ctx, msg); err != nil {
//			log.ZError(ctx, "UserSubscribeOnlineStatusNotification push failed", err, "userID", client.UserID, "platformID", client.PlatformID, "changeUserID", userID, "content", msgContent)
//		}
//	}
//}