package unrelation

import (
	"Open_IM/pkg/common/config"
	"Open_IM/pkg/common/db/table/unrelation"
	"Open_IM/pkg/utils"
	"context"
	"go.mongodb.org/mongo-driver/bson"
	"go.mongodb.org/mongo-driver/mongo"
	"go.mongodb.org/mongo-driver/mongo/options"
	"go.mongodb.org/mongo-driver/mongo/readconcern"
)

func NewSuperGroupMongoDriver(mgoClient *mongo.Client) unrelation.SuperGroupModelInterface {
	mgoDB := mgoClient.Database(config.Config.Mongo.DBDatabase)
	return &SuperGroupMongoDriver{MgoDB: mgoDB, MgoClient: mgoClient, superGroupCollection: mgoDB.Collection(unrelation.CSuperGroup), userToSuperGroupCollection: mgoDB.Collection(unrelation.CUserToSuperGroup)}
}

type SuperGroupMongoDriver struct {
	MgoClient                  *mongo.Client
	MgoDB                      *mongo.Database
	superGroupCollection       *mongo.Collection
	userToSuperGroupCollection *mongo.Collection
}

func (s *SuperGroupMongoDriver) CreateSuperGroup(ctx context.Context, groupID string, initMemberIDs []string) error {
	_, err := s.superGroupCollection.InsertOne(ctx, &unrelation.SuperGroupModel{
		GroupID:   groupID,
		MemberIDs: initMemberIDs,
	})
	if err != nil {
		return err
	}
	for _, userID := range initMemberIDs {
		_, err = s.userToSuperGroupCollection.UpdateOne(ctx, bson.M{"user_id": userID}, bson.M{"$addToSet": bson.M{"group_id_list": groupID}}, &options.UpdateOptions{
			Upsert: utils.ToPtr(true),
		})
		if err != nil {
			return err
		}
	}
	return nil
}

func (s *SuperGroupMongoDriver) TakeSuperGroup(ctx context.Context, groupID string) (group *unrelation.SuperGroupModel, err error) {
	if err := s.superGroupCollection.FindOne(ctx, bson.M{"group_id": groupID}).Decode(&group); err != nil {
		return nil, utils.Wrap(err, "")
	}
	return group, nil
}

func (s *SuperGroupMongoDriver) FindSuperGroup(ctx context.Context, groupIDs []string) (groups []*unrelation.SuperGroupModel, err error) {
	cursor, err := s.superGroupCollection.Find(ctx, bson.M{"group_id": bson.M{
		"$in": groupIDs,
	}})
	if err != nil {
		return nil, err
	}
	defer cursor.Close(ctx)

	if err := cursor.All(ctx, &groups); err != nil {
		return nil, utils.Wrap(err, "")
	}
	return groups, nil
}

func (s *SuperGroupMongoDriver) AddUserToSuperGroup(ctx context.Context, groupID string, userIDs []string) error {
	opts := options.Session().SetDefaultReadConcern(readconcern.Majority())
	return s.MgoDB.Client().UseSessionWithOptions(ctx, opts, func(sCtx mongo.SessionContext) error {
		_, err := s.superGroupCollection.UpdateOne(sCtx, bson.M{"group_id": groupID}, bson.M{"$addToSet": bson.M{"member_id_list": bson.M{"$each": userIDs}}})
		if err != nil {
			_ = sCtx.AbortTransaction(ctx)
			return err
		}
		upsert := true
		opts := &options.UpdateOptions{
			Upsert: &upsert,
		}
		for _, userID := range userIDs {
			_, err = s.userToSuperGroupCollection.UpdateOne(sCtx, bson.M{"user_id": userID}, bson.M{"$addToSet": bson.M{"group_id_list": groupID}}, opts)
			if err != nil {
				_ = sCtx.AbortTransaction(ctx)
				return utils.Wrap(err, "transaction failed")
			}
		}
		return sCtx.CommitTransaction(ctx)
	})
}

func (s *SuperGroupMongoDriver) RemoverUserFromSuperGroup(ctx context.Context, groupID string, userIDs []string) error {
	opts := options.Session().SetDefaultReadConcern(readconcern.Majority())
	return s.MgoDB.Client().UseSessionWithOptions(ctx, opts, func(sCtx mongo.SessionContext) error {
		_, err := s.superGroupCollection.UpdateOne(sCtx, bson.M{"group_id": groupID}, bson.M{"$pull": bson.M{"member_id_list": bson.M{"$in": userIDs}}})
		if err != nil {
			_ = sCtx.AbortTransaction(ctx)
			return err
		}
		err = s.RemoveGroupFromUser(sCtx, groupID, userIDs)
		if err != nil {
			_ = sCtx.AbortTransaction(ctx)
			return err
		}
		return sCtx.CommitTransaction(ctx)
	})
}

func (s *SuperGroupMongoDriver) GetSuperGroupByUserID(ctx context.Context, userID string) (*unrelation.UserToSuperGroupModel, error) {
	var user unrelation.UserToSuperGroupModel
	err := s.userToSuperGroupCollection.FindOne(ctx, bson.M{"user_id": userID}).Decode(&user)
	return &user, utils.Wrap(err, "")
}

func (s *SuperGroupMongoDriver) DeleteSuperGroup(ctx context.Context, groupID string) error {
	group, err := s.TakeSuperGroup(ctx, groupID)
	if err != nil {
		return err
	}
	if _, err := s.superGroupCollection.DeleteOne(ctx, bson.M{"group_id": groupID}); err != nil {
		return utils.Wrap(err, "")
	}
	return s.RemoveGroupFromUser(ctx, groupID, group.MemberIDs)
}

func (s *SuperGroupMongoDriver) RemoveGroupFromUser(ctx context.Context, groupID string, userIDs []string) error {
	_, err := s.userToSuperGroupCollection.UpdateOne(ctx, bson.M{"user_id": bson.M{"$in": userIDs}}, bson.M{"$pull": bson.M{"group_id_list": groupID}})
	return utils.Wrap(err, "")
}