// Copyright © 2023 OpenIM. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package friend

import (
	"context"

	"github.com/openimsdk/open-im-server/v3/pkg/common/config"
	"github.com/openimsdk/open-im-server/v3/pkg/common/storage/cache/redis"
	"github.com/openimsdk/open-im-server/v3/pkg/common/storage/database/mgo"
	"github.com/openimsdk/open-im-server/v3/pkg/common/storage/model"
	"github.com/openimsdk/open-im-server/v3/pkg/common/webhook"
	"github.com/openimsdk/open-im-server/v3/pkg/localcache"
	"github.com/openimsdk/tools/db/redisutil"

	"github.com/openimsdk/open-im-server/v3/pkg/authverify"
	"github.com/openimsdk/open-im-server/v3/pkg/common/convert"
	"github.com/openimsdk/open-im-server/v3/pkg/common/servererrs"
	"github.com/openimsdk/open-im-server/v3/pkg/common/storage/controller"
	"github.com/openimsdk/open-im-server/v3/pkg/rpcclient"
	"github.com/openimsdk/protocol/constant"
	"github.com/openimsdk/protocol/relation"
	"github.com/openimsdk/protocol/sdkws"
	"github.com/openimsdk/tools/db/mongoutil"
	"github.com/openimsdk/tools/discovery"
	"github.com/openimsdk/tools/errs"
	"github.com/openimsdk/tools/utils/datautil"
	"google.golang.org/grpc"
)

type friendServer struct {
	db                    controller.FriendDatabase
	blackDatabase         controller.BlackDatabase
	userRpcClient         *rpcclient.UserRpcClient
	notificationSender    *FriendNotificationSender
	conversationRpcClient rpcclient.ConversationRpcClient
	RegisterCenter        discovery.SvcDiscoveryRegistry
	config                *Config
	webhookClient         *webhook.Client
}

type Config struct {
	RpcConfig     config.Friend
	RedisConfig   config.Redis
	MongodbConfig config.Mongo
	// ZookeeperConfig    config.ZooKeeper
	NotificationConfig config.Notification
	Share              config.Share
	WebhooksConfig     config.Webhooks
	LocalCacheConfig   config.LocalCache
	Discovery          config.Discovery
}

func Start(ctx context.Context, config *Config, client discovery.SvcDiscoveryRegistry, server *grpc.Server) error {
	mgocli, err := mongoutil.NewMongoDB(ctx, config.MongodbConfig.Build())
	if err != nil {
		return err
	}
	rdb, err := redisutil.NewRedisClient(ctx, config.RedisConfig.Build())
	if err != nil {
		return err
	}

	friendMongoDB, err := mgo.NewFriendMongo(mgocli.GetDB())
	if err != nil {
		return err
	}

	friendRequestMongoDB, err := mgo.NewFriendRequestMongo(mgocli.GetDB())
	if err != nil {
		return err
	}

	blackMongoDB, err := mgo.NewBlackMongo(mgocli.GetDB())
	if err != nil {
		return err
	}

	// Initialize RPC clients
	userRpcClient := rpcclient.NewUserRpcClient(client, config.Share.RpcRegisterName.User, config.Share.IMAdminUserID)
	msgRpcClient := rpcclient.NewMessageRpcClient(client, config.Share.RpcRegisterName.Msg)

	// Initialize notification sender
	notificationSender := NewFriendNotificationSender(
		&config.NotificationConfig,
		&msgRpcClient,
		WithRpcFunc(userRpcClient.GetUsersInfo),
	)
	localcache.InitLocalCache(&config.LocalCacheConfig)

	// Register Friend server with refactored MongoDB and Redis integrations
	relation.RegisterFriendServer(server, &friendServer{
		db: controller.NewFriendDatabase(
			friendMongoDB,
			friendRequestMongoDB,
			redis.NewFriendCacheRedis(rdb, &config.LocalCacheConfig, friendMongoDB, redis.GetRocksCacheOptions()),
			mgocli.GetTx(),
		),
		blackDatabase: controller.NewBlackDatabase(
			blackMongoDB,
			redis.NewBlackCacheRedis(rdb, &config.LocalCacheConfig, blackMongoDB, redis.GetRocksCacheOptions()),
		),
		userRpcClient:         &userRpcClient,
		notificationSender:    notificationSender,
		RegisterCenter:        client,
		conversationRpcClient: rpcclient.NewConversationRpcClient(client, config.Share.RpcRegisterName.Conversation),
		config:                config,
		webhookClient:         webhook.NewWebhookClient(config.WebhooksConfig.URL),
	})

	return nil
}

// ok.
func (s *friendServer) ApplyToAddFriend(ctx context.Context, req *relation.ApplyToAddFriendReq) (resp *relation.ApplyToAddFriendResp, err error) {
	resp = &relation.ApplyToAddFriendResp{}
	if err := authverify.CheckAccessV3(ctx, req.FromUserID, s.config.Share.IMAdminUserID); err != nil {
		return nil, err
	}
	if req.ToUserID == req.FromUserID {
		return nil, servererrs.ErrCanNotAddYourself.WrapMsg("req.ToUserID", req.ToUserID)
	}
	if err = s.webhookBeforeAddFriend(ctx, &s.config.WebhooksConfig.BeforeAddFriend, req); err != nil && err != servererrs.ErrCallbackContinue {
		return nil, err
	}
	if _, err := s.userRpcClient.GetUsersInfoMap(ctx, []string{req.ToUserID, req.FromUserID}); err != nil {
		return nil, err
	}

	in1, in2, err := s.db.CheckIn(ctx, req.FromUserID, req.ToUserID)
	if err != nil {
		return nil, err
	}
	if in1 && in2 {
		return nil, servererrs.ErrRelationshipAlready.WrapMsg("already friends has f")
	}
	if err = s.db.AddFriendRequest(ctx, req.FromUserID, req.ToUserID, req.ReqMsg, req.Ex); err != nil {
		return nil, err
	}
	s.notificationSender.FriendApplicationAddNotification(ctx, req)
	s.webhookAfterAddFriend(ctx, &s.config.WebhooksConfig.AfterAddFriend, req)
	return resp, nil
}

// ok.
func (s *friendServer) ImportFriends(ctx context.Context, req *relation.ImportFriendReq) (resp *relation.ImportFriendResp, err error) {
	if err := authverify.CheckAdmin(ctx, s.config.Share.IMAdminUserID); err != nil {
		return nil, err
	}
	if _, err := s.userRpcClient.GetUsersInfo(ctx, append([]string{req.OwnerUserID}, req.FriendUserIDs...)); err != nil {
		return nil, err
	}
	if datautil.Contain(req.OwnerUserID, req.FriendUserIDs...) {
		return nil, servererrs.ErrCanNotAddYourself.WrapMsg("can not add yourself")
	}
	if datautil.Duplicate(req.FriendUserIDs) {
		return nil, errs.ErrArgs.WrapMsg("friend userID repeated")
	}

	if err := s.webhookBeforeImportFriends(ctx, &s.config.WebhooksConfig.BeforeImportFriends, req); err != nil && err != servererrs.ErrCallbackContinue {
		return nil, err
	}

	if err := s.db.BecomeFriends(ctx, req.OwnerUserID, req.FriendUserIDs, constant.BecomeFriendByImport); err != nil {
		return nil, err
	}
	for _, userID := range req.FriendUserIDs {
		s.notificationSender.FriendApplicationAgreedNotification(ctx, &relation.RespondFriendApplyReq{
			FromUserID:   req.OwnerUserID,
			ToUserID:     userID,
			HandleResult: constant.FriendResponseAgree,
		})
	}

	s.webhookAfterImportFriends(ctx, &s.config.WebhooksConfig.AfterImportFriends, req)
	return &relation.ImportFriendResp{}, nil
}

// ok.
func (s *friendServer) RespondFriendApply(ctx context.Context, req *relation.RespondFriendApplyReq) (resp *relation.RespondFriendApplyResp, err error) {
	resp = &relation.RespondFriendApplyResp{}
	if err := authverify.CheckAccessV3(ctx, req.ToUserID, s.config.Share.IMAdminUserID); err != nil {
		return nil, err
	}

	friendRequest := model.FriendRequest{
		FromUserID:   req.FromUserID,
		ToUserID:     req.ToUserID,
		HandleMsg:    req.HandleMsg,
		HandleResult: req.HandleResult,
	}
	if req.HandleResult == constant.FriendResponseAgree {
		if err := s.webhookBeforeAddFriendAgree(ctx, &s.config.WebhooksConfig.BeforeAddFriendAgree, req); err != nil && err != servererrs.ErrCallbackContinue {
			return nil, err
		}
		err := s.db.AgreeFriendRequest(ctx, &friendRequest)
		if err != nil {
			return nil, err
		}
		s.notificationSender.FriendApplicationAgreedNotification(ctx, req)
		return resp, nil
	}
	if req.HandleResult == constant.FriendResponseRefuse {
		err := s.db.RefuseFriendRequest(ctx, &friendRequest)
		if err != nil {
			return nil, err
		}
		s.notificationSender.FriendApplicationRefusedNotification(ctx, req)
		return resp, nil
	}
	return nil, errs.ErrArgs.WrapMsg("req.HandleResult != -1/1")
}

// ok.
func (s *friendServer) DeleteFriend(ctx context.Context, req *relation.DeleteFriendReq) (resp *relation.DeleteFriendResp, err error) {
	resp = &relation.DeleteFriendResp{}
	if err := s.userRpcClient.Access(ctx, req.OwnerUserID); err != nil {
		return nil, err
	}
	_, err = s.db.FindFriendsWithError(ctx, req.OwnerUserID, []string{req.FriendUserID})
	if err != nil {
		return nil, err
	}
	if err := s.db.Delete(ctx, req.OwnerUserID, []string{req.FriendUserID}); err != nil {
		return nil, err
	}
	s.notificationSender.FriendDeletedNotification(ctx, req)
	s.webhookAfterDeleteFriend(ctx, &s.config.WebhooksConfig.AfterDeleteFriend, req)
	return resp, nil
}

// ok.
func (s *friendServer) SetFriendRemark(ctx context.Context, req *relation.SetFriendRemarkReq) (resp *relation.SetFriendRemarkResp, err error) {
	if err = s.webhookBeforeSetFriendRemark(ctx, &s.config.WebhooksConfig.BeforeSetFriendRemark, req); err != nil && err != servererrs.ErrCallbackContinue {
		return nil, err
	}
	resp = &relation.SetFriendRemarkResp{}
	if err := s.userRpcClient.Access(ctx, req.OwnerUserID); err != nil {
		return nil, err
	}
	_, err = s.db.FindFriendsWithError(ctx, req.OwnerUserID, []string{req.FriendUserID})
	if err != nil {
		return nil, err
	}
	if err := s.db.UpdateRemark(ctx, req.OwnerUserID, req.FriendUserID, req.Remark); err != nil {
		return nil, err
	}
	s.webhookAfterSetFriendRemark(ctx, &s.config.WebhooksConfig.AfterSetFriendRemark, req)
	s.notificationSender.FriendRemarkSetNotification(ctx, req.OwnerUserID, req.FriendUserID)
	return resp, nil
}

// ok.
func (s *friendServer) GetDesignatedFriends(ctx context.Context, req *relation.GetDesignatedFriendsReq) (resp *relation.GetDesignatedFriendsResp, err error) {
	resp = &relation.GetDesignatedFriendsResp{}
	if datautil.Duplicate(req.FriendUserIDs) {
		return nil, errs.ErrArgs.WrapMsg("friend userID repeated")
	}
	friends, err := s.getFriend(ctx, req.OwnerUserID, req.FriendUserIDs)
	if err != nil {
		return nil, err
	}
	return &relation.GetDesignatedFriendsResp{
		FriendsInfo: friends,
	}, nil
}

func (s *friendServer) getFriend(ctx context.Context, ownerUserID string, friendUserIDs []string) ([]*sdkws.FriendInfo, error) {
	if len(friendUserIDs) == 0 {
		return nil, nil
	}
	friends, err := s.db.FindFriendsWithError(ctx, ownerUserID, friendUserIDs)
	if err != nil {
		return nil, err
	}
	return convert.FriendsDB2Pb(ctx, friends, s.userRpcClient.GetUsersInfoMap)
}

// Get the list of friend requests sent out proactively.
func (s *friendServer) GetDesignatedFriendsApply(ctx context.Context,
	req *relation.GetDesignatedFriendsApplyReq,
) (resp *relation.GetDesignatedFriendsApplyResp, err error) {
	friendRequests, err := s.db.FindBothFriendRequests(ctx, req.FromUserID, req.ToUserID)
	if err != nil {
		return nil, err
	}
	resp = &relation.GetDesignatedFriendsApplyResp{}
	resp.FriendRequests, err = convert.FriendRequestDB2Pb(ctx, friendRequests, s.userRpcClient.GetUsersInfoMap)
	if err != nil {
		return nil, err
	}
	return resp, nil
}

// Get received friend requests (i.e., those initiated by others).
func (s *friendServer) GetPaginationFriendsApplyTo(ctx context.Context, req *relation.GetPaginationFriendsApplyToReq) (resp *relation.GetPaginationFriendsApplyToResp, err error) {
	if err := s.userRpcClient.Access(ctx, req.UserID); err != nil {
		return nil, err
	}
	total, friendRequests, err := s.db.PageFriendRequestToMe(ctx, req.UserID, req.Pagination)
	if err != nil {
		return nil, err
	}
	resp = &relation.GetPaginationFriendsApplyToResp{}
	resp.FriendRequests, err = convert.FriendRequestDB2Pb(ctx, friendRequests, s.userRpcClient.GetUsersInfoMap)
	if err != nil {
		return nil, err
	}
	resp.Total = int32(total)
	return resp, nil
}

func (s *friendServer) GetPaginationFriendsApplyFrom(ctx context.Context, req *relation.GetPaginationFriendsApplyFromReq) (resp *relation.GetPaginationFriendsApplyFromResp, err error) {
	resp = &relation.GetPaginationFriendsApplyFromResp{}
	if err := s.userRpcClient.Access(ctx, req.UserID); err != nil {
		return nil, err
	}
	total, friendRequests, err := s.db.PageFriendRequestFromMe(ctx, req.UserID, req.Pagination)
	if err != nil {
		return nil, err
	}
	resp.FriendRequests, err = convert.FriendRequestDB2Pb(ctx, friendRequests, s.userRpcClient.GetUsersInfoMap)
	if err != nil {
		return nil, err
	}
	resp.Total = int32(total)
	return resp, nil
}

// ok.
func (s *friendServer) IsFriend(ctx context.Context, req *relation.IsFriendReq) (resp *relation.IsFriendResp, err error) {
	resp = &relation.IsFriendResp{}
	resp.InUser1Friends, resp.InUser2Friends, err = s.db.CheckIn(ctx, req.UserID1, req.UserID2)
	if err != nil {
		return nil, err
	}
	return resp, nil
}

func (s *friendServer) GetPaginationFriends(ctx context.Context, req *relation.GetPaginationFriendsReq) (resp *relation.GetPaginationFriendsResp, err error) {
	if err := s.userRpcClient.Access(ctx, req.UserID); err != nil {
		return nil, err
	}
	total, friends, err := s.db.PageOwnerFriends(ctx, req.UserID, req.Pagination)
	if err != nil {
		return nil, err
	}
	resp = &relation.GetPaginationFriendsResp{}
	resp.FriendsInfo, err = convert.FriendsDB2Pb(ctx, friends, s.userRpcClient.GetUsersInfoMap)
	if err != nil {
		return nil, err
	}
	resp.Total = int32(total)
	return resp, nil
}

func (s *friendServer) GetFriendIDs(ctx context.Context, req *relation.GetFriendIDsReq) (resp *relation.GetFriendIDsResp, err error) {
	if err := s.userRpcClient.Access(ctx, req.UserID); err != nil {
		return nil, err
	}
	resp = &relation.GetFriendIDsResp{}
	resp.FriendIDs, err = s.db.FindFriendUserIDs(ctx, req.UserID)
	if err != nil {
		return nil, err
	}
	return resp, nil
}

func (s *friendServer) GetSpecifiedFriendsInfo(ctx context.Context, req *relation.GetSpecifiedFriendsInfoReq) (*relation.GetSpecifiedFriendsInfoResp, error) {
	if len(req.UserIDList) == 0 {
		return nil, errs.ErrArgs.WrapMsg("userIDList is empty")
	}
	if datautil.Duplicate(req.UserIDList) {
		return nil, errs.ErrArgs.WrapMsg("userIDList repeated")
	}
	userMap, err := s.userRpcClient.GetUsersInfoMap(ctx, req.UserIDList)
	if err != nil {
		return nil, err
	}
	friends, err := s.db.FindFriendsWithError(ctx, req.OwnerUserID, req.UserIDList)
	if err != nil {
		return nil, err
	}
	blacks, err := s.blackDatabase.FindBlackInfos(ctx, req.OwnerUserID, req.UserIDList)
	if err != nil {
		return nil, err
	}
	friendMap := datautil.SliceToMap(friends, func(e *model.Friend) string {
		return e.FriendUserID
	})
	blackMap := datautil.SliceToMap(blacks, func(e *model.Black) string {
		return e.BlockUserID
	})
	resp := &relation.GetSpecifiedFriendsInfoResp{
		Infos: make([]*relation.GetSpecifiedFriendsInfoInfo, 0, len(req.UserIDList)),
	}
	for _, userID := range req.UserIDList {
		user := userMap[userID]
		if user == nil {
			continue
		}
		var friendInfo *sdkws.FriendInfo
		if friend := friendMap[userID]; friend != nil {
			friendInfo = &sdkws.FriendInfo{
				OwnerUserID:    friend.OwnerUserID,
				Remark:         friend.Remark,
				CreateTime:     friend.CreateTime.UnixMilli(),
				AddSource:      friend.AddSource,
				OperatorUserID: friend.OperatorUserID,
				Ex:             friend.Ex,
				IsPinned:       friend.IsPinned,
			}
		}
		var blackInfo *sdkws.BlackInfo
		if black := blackMap[userID]; black != nil {
			blackInfo = &sdkws.BlackInfo{
				OwnerUserID:    black.OwnerUserID,
				CreateTime:     black.CreateTime.UnixMilli(),
				AddSource:      black.AddSource,
				OperatorUserID: black.OperatorUserID,
				Ex:             black.Ex,
			}
		}
		resp.Infos = append(resp.Infos, &relation.GetSpecifiedFriendsInfoInfo{
			UserInfo:   user,
			FriendInfo: friendInfo,
			BlackInfo:  blackInfo,
		})
	}
	return resp, nil
}

func (s *friendServer) UpdateFriends(
	ctx context.Context,
	req *relation.UpdateFriendsReq,
) (*relation.UpdateFriendsResp, error) {
	if len(req.FriendUserIDs) == 0 {
		return nil, errs.ErrArgs.WrapMsg("friendIDList is empty")
	}
	if datautil.Duplicate(req.FriendUserIDs) {
		return nil, errs.ErrArgs.WrapMsg("friendIDList repeated")
	}

	_, err := s.db.FindFriendsWithError(ctx, req.OwnerUserID, req.FriendUserIDs)
	if err != nil {
		return nil, err
	}

	val := make(map[string]any)

	if req.IsPinned != nil {
		val["is_pinned"] = req.IsPinned.Value
	}
	if req.Remark != nil {
		val["remark"] = req.Remark.Value
	}
	if req.Ex != nil {
		val["ex"] = req.Ex.Value
	}
	if err = s.db.UpdateFriends(ctx, req.OwnerUserID, req.FriendUserIDs, val); err != nil {
		return nil, err
	}

	resp := &relation.UpdateFriendsResp{}

	s.notificationSender.FriendsInfoUpdateNotification(ctx, req.OwnerUserID, req.FriendUserIDs)
	return resp, nil
}

func (s *friendServer) GetIncrementalFriendsApplyTo(ctx context.Context, req *relation.GetIncrementalFriendsApplyToReq) (*relation.GetIncrementalFriendsApplyToResp, error) {
	// TODO implement me
	return nil, nil
}

func (s *friendServer) GetIncrementalFriendsApplyFrom(ctx context.Context, req *relation.GetIncrementalFriendsApplyFromReq) (*relation.GetIncrementalFriendsApplyFromResp, error) {
	// TODO implement me
	return nil, nil
}

func (s *friendServer) GetIncrementalBlacks(ctx context.Context, req *relation.GetIncrementalBlacksReq) (*relation.GetIncrementalBlacksResp, error) {
	// TODO implement me
	return nil, nil
}