// 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 relation

import (
	"context"

	"github.com/openimsdk/open-im-server/v3/pkg/rpcli"
	"github.com/openimsdk/protocol/msg"
	"github.com/openimsdk/tools/errs"
	"github.com/openimsdk/tools/log"
	"github.com/openimsdk/tools/utils/datautil"

	"github.com/openimsdk/open-im-server/v3/pkg/common/storage/database"
	"github.com/openimsdk/open-im-server/v3/pkg/common/storage/versionctx"

	relationtb "github.com/openimsdk/open-im-server/v3/pkg/common/storage/model"

	"github.com/openimsdk/open-im-server/v3/pkg/common/config"
	"github.com/openimsdk/open-im-server/v3/pkg/common/convert"
	"github.com/openimsdk/open-im-server/v3/pkg/common/storage/controller"
	"github.com/openimsdk/open-im-server/v3/pkg/notification"
	"github.com/openimsdk/open-im-server/v3/pkg/notification/common_user"
	"github.com/openimsdk/protocol/constant"
	"github.com/openimsdk/protocol/relation"
	"github.com/openimsdk/protocol/sdkws"
	"github.com/openimsdk/tools/mcontext"
)

type FriendNotificationSender struct {
	*notification.NotificationSender
	// Target not found err
	getUsersInfo func(ctx context.Context, userIDs []string) ([]common_user.CommonUser, error)
	// db controller
	db controller.FriendDatabase
}

type friendNotificationSenderOptions func(*FriendNotificationSender)

func WithFriendDB(db controller.FriendDatabase) friendNotificationSenderOptions {
	return func(s *FriendNotificationSender) {
		s.db = db
	}
}

func WithDBFunc(fn func(ctx context.Context, userIDs []string) (users []*relationtb.User, err error)) friendNotificationSenderOptions {
	return func(s *FriendNotificationSender) {
		f := func(ctx context.Context, userIDs []string) (result []common_user.CommonUser, err error) {
			users, err := fn(ctx, userIDs)
			if err != nil {
				return nil, err
			}
			for _, user := range users {
				result = append(result, user)
			}
			return result, nil
		}
		s.getUsersInfo = f
	}
}

func WithRpcFunc(fn func(ctx context.Context, userIDs []string) ([]*sdkws.UserInfo, error)) friendNotificationSenderOptions {
	return func(s *FriendNotificationSender) {
		f := func(ctx context.Context, userIDs []string) (result []common_user.CommonUser, err error) {
			users, err := fn(ctx, userIDs)
			if err != nil {
				return nil, err
			}
			for _, user := range users {
				result = append(result, user)
			}
			return result, err
		}
		s.getUsersInfo = f
	}
}

func NewFriendNotificationSender(conf *config.Notification, msgClient *rpcli.MsgClient, opts ...friendNotificationSenderOptions) *FriendNotificationSender {
	f := &FriendNotificationSender{
		NotificationSender: notification.NewNotificationSender(conf, notification.WithRpcClient(func(ctx context.Context, req *msg.SendMsgReq) (*msg.SendMsgResp, error) {
			return msgClient.SendMsg(ctx, req)
		})),
	}
	for _, opt := range opts {
		opt(f)
	}
	return f
}

func (f *FriendNotificationSender) getUsersInfoMap(ctx context.Context, userIDs []string) (map[string]*sdkws.UserInfo, error) {
	users, err := f.getUsersInfo(ctx, userIDs)
	if err != nil {
		return nil, err
	}
	result := make(map[string]*sdkws.UserInfo)
	for _, user := range users {
		result[user.GetUserID()] = user.(*sdkws.UserInfo)
	}
	return result, nil
}

//nolint:unused
func (f *FriendNotificationSender) getFromToUserNickname(ctx context.Context, fromUserID, toUserID string) (string, string, error) {
	users, err := f.getUsersInfoMap(ctx, []string{fromUserID, toUserID})
	if err != nil {
		return "", "", nil
	}
	return users[fromUserID].Nickname, users[toUserID].Nickname, nil
}

func (f *FriendNotificationSender) UserInfoUpdatedNotification(ctx context.Context, changedUserID string) {
	tips := sdkws.UserInfoUpdatedTips{UserID: changedUserID}
	f.Notification(ctx, mcontext.GetOpUserID(ctx), changedUserID, constant.UserInfoUpdatedNotification, &tips)
}

func (f *FriendNotificationSender) getCommonUserMap(ctx context.Context, userIDs []string) (map[string]common_user.CommonUser, error) {
	users, err := f.getUsersInfo(ctx, userIDs)
	if err != nil {
		return nil, err
	}
	return datautil.SliceToMap(users, func(e common_user.CommonUser) string {
		return e.GetUserID()
	}), nil
}

func (f *FriendNotificationSender) getFriendRequests(ctx context.Context, fromUserID, toUserID string) (*sdkws.FriendRequest, error) {
	if f.db == nil {
		return nil, errs.ErrInternalServer.WithDetail("db is nil")
	}
	friendRequests, err := f.db.FindBothFriendRequests(ctx, fromUserID, toUserID)
	if err != nil {
		return nil, err
	}
	requests, err := convert.FriendRequestDB2Pb(ctx, friendRequests, f.getCommonUserMap)
	if err != nil {
		return nil, err
	}
	for _, request := range requests {
		if request.FromUserID == fromUserID && request.ToUserID == toUserID {
			return request, nil
		}
	}
	return nil, errs.ErrRecordNotFound.WrapMsg("friend request not found", "fromUserID", fromUserID, "toUserID", toUserID)
}

func (f *FriendNotificationSender) FriendApplicationAddNotification(ctx context.Context, req *relation.ApplyToAddFriendReq) {
	request, err := f.getFriendRequests(ctx, req.FromUserID, req.ToUserID)
	if err != nil {
		log.ZError(ctx, "FriendApplicationAddNotification get friend request", err, "fromUserID", req.FromUserID, "toUserID", req.ToUserID)
		return
	}
	tips := sdkws.FriendApplicationTips{
		FromToUserID: &sdkws.FromToUserID{
			FromUserID: req.FromUserID,
			ToUserID:   req.ToUserID,
		},
		Request: request,
	}
	f.Notification(ctx, req.FromUserID, req.ToUserID, constant.FriendApplicationNotification, &tips)
}

func (f *FriendNotificationSender) FriendApplicationAgreedNotification(ctx context.Context, req *relation.RespondFriendApplyReq) {
	request, err := f.getFriendRequests(ctx, req.FromUserID, req.ToUserID)
	if err != nil {
		log.ZError(ctx, "FriendApplicationAgreedNotification get friend request", err, "fromUserID", req.FromUserID, "toUserID", req.ToUserID)
		return
	}
	tips := sdkws.FriendApplicationApprovedTips{
		FromToUserID: &sdkws.FromToUserID{
			FromUserID: req.FromUserID,
			ToUserID:   req.ToUserID,
		},
		HandleMsg: req.HandleMsg,
		Request:   request,
	}
	f.Notification(ctx, req.ToUserID, req.FromUserID, constant.FriendApplicationApprovedNotification, &tips)
}

func (f *FriendNotificationSender) FriendApplicationRefusedNotification(ctx context.Context, req *relation.RespondFriendApplyReq) {
	request, err := f.getFriendRequests(ctx, req.FromUserID, req.ToUserID)
	if err != nil {
		log.ZError(ctx, "FriendApplicationRefusedNotification get friend request", err, "fromUserID", req.FromUserID, "toUserID", req.ToUserID)
		return
	}
	tips := sdkws.FriendApplicationRejectedTips{
		FromToUserID: &sdkws.FromToUserID{
			FromUserID: req.FromUserID,
			ToUserID:   req.ToUserID,
		},
		HandleMsg: req.HandleMsg,
		Request:   request,
	}
	f.Notification(ctx, req.ToUserID, req.FromUserID, constant.FriendApplicationRejectedNotification, &tips)
}

//func (f *FriendNotificationSender) FriendAddedNotification(ctx context.Context, operationID, opUserID, fromUserID, toUserID string) error {
//	tips := sdkws.FriendAddedTips{Friend: &sdkws.FriendInfo{}, OpUser: &sdkws.PublicUserInfo{}}
//	user, err := f.getUsersInfo(ctx, []string{opUserID})
//	if err != nil {
//		return err
//	}
//	tips.OpUser.UserID = user[0].GetUserID()
//	tips.OpUser.Ex = user[0].GetEx()
//	tips.OpUser.Nickname = user[0].GetNickname()
//	tips.OpUser.FaceURL = user[0].GetFaceURL()
//	friends, err := f.db.FindFriendsWithError(ctx, fromUserID, []string{toUserID})
//	if err != nil {
//		return err
//	}
//	tips.Friend, err = convert.FriendDB2Pb(ctx, friends[0], f.getUsersInfoMap)
//	if err != nil {
//		return err
//	}
//	f.Notification(ctx, fromUserID, toUserID, constant.FriendAddedNotification, &tips)
//	return nil
//}

func (f *FriendNotificationSender) FriendDeletedNotification(ctx context.Context, req *relation.DeleteFriendReq) {
	tips := sdkws.FriendDeletedTips{FromToUserID: &sdkws.FromToUserID{
		FromUserID: req.OwnerUserID,
		ToUserID:   req.FriendUserID,
	}}
	f.Notification(ctx, req.OwnerUserID, req.FriendUserID, constant.FriendDeletedNotification, &tips)
}

func (f *FriendNotificationSender) setVersion(ctx context.Context, version *uint64, versionID *string, collName string, id string) {
	versions := versionctx.GetVersionLog(ctx).Get()
	for _, coll := range versions {
		if coll.Name == collName && coll.Doc.DID == id {
			*version = uint64(coll.Doc.Version)
			*versionID = coll.Doc.ID.Hex()
			return
		}
	}
}

func (f *FriendNotificationSender) setSortVersion(ctx context.Context, version *uint64, versionID *string, collName string, id string, sortVersion *uint64) {
	versions := versionctx.GetVersionLog(ctx).Get()
	for _, coll := range versions {
		if coll.Name == collName && coll.Doc.DID == id {
			*version = uint64(coll.Doc.Version)
			*versionID = coll.Doc.ID.Hex()
			for _, elem := range coll.Doc.Logs {
				if elem.EID == relationtb.VersionSortChangeID {
					*sortVersion = uint64(elem.Version)
				}
			}
		}
	}
}

func (f *FriendNotificationSender) FriendRemarkSetNotification(ctx context.Context, fromUserID, toUserID string) {
	tips := sdkws.FriendInfoChangedTips{FromToUserID: &sdkws.FromToUserID{}}
	tips.FromToUserID.FromUserID = fromUserID
	tips.FromToUserID.ToUserID = toUserID
	f.setSortVersion(ctx, &tips.FriendVersion, &tips.FriendVersionID, database.FriendVersionName, toUserID, &tips.FriendSortVersion)
	f.Notification(ctx, fromUserID, toUserID, constant.FriendRemarkSetNotification, &tips)
}

func (f *FriendNotificationSender) FriendsInfoUpdateNotification(ctx context.Context, toUserID string, friendIDs []string) {
	tips := sdkws.FriendsInfoUpdateTips{FromToUserID: &sdkws.FromToUserID{}}
	tips.FromToUserID.ToUserID = toUserID
	tips.FriendIDs = friendIDs
	f.Notification(ctx, toUserID, toUserID, constant.FriendsInfoUpdateNotification, &tips)
}

func (f *FriendNotificationSender) BlackAddedNotification(ctx context.Context, req *relation.AddBlackReq) {
	tips := sdkws.BlackAddedTips{FromToUserID: &sdkws.FromToUserID{}}
	tips.FromToUserID.FromUserID = req.OwnerUserID
	tips.FromToUserID.ToUserID = req.BlackUserID
	f.Notification(ctx, req.OwnerUserID, req.BlackUserID, constant.BlackAddedNotification, &tips)
}

func (f *FriendNotificationSender) BlackDeletedNotification(ctx context.Context, req *relation.RemoveBlackReq) {
	blackDeletedTips := sdkws.BlackDeletedTips{FromToUserID: &sdkws.FromToUserID{
		FromUserID: req.OwnerUserID,
		ToUserID:   req.BlackUserID,
	}}
	f.Notification(ctx, req.OwnerUserID, req.BlackUserID, constant.BlackDeletedNotification, &blackDeletedTips)
}

func (f *FriendNotificationSender) FriendInfoUpdatedNotification(ctx context.Context, changedUserID string, needNotifiedUserID string) {
	tips := sdkws.UserInfoUpdatedTips{UserID: changedUserID}
	f.Notification(ctx, mcontext.GetOpUserID(ctx), needNotifiedUserID, constant.FriendInfoUpdatedNotification, &tips)
}