add user service

internal/user/service/service.go

@@ -0,0 +1,57 @@
+package service
+
+import (
+	"context"
+	"errors"
+
+	"datarush/internal/user/middleware"
+	pb "datarush/pkg/api/user"
+	"google.golang.org/protobuf/types/known/emptypb"
+)
+
+type UserRepository interface {
+	GetProfile(ctx context.Context, userID string) (*pb.User, error)
+	RegisterForCompetition(ctx context.Context, userID, competitionID string) error
+	UnregisterFromCompetition(ctx context.Context, userID, competitionID string) error
+	ListUserCompetitions(ctx context.Context, userID string) ([]string, error)
+}
+
+type UserService struct {
+	repo UserRepository
+}
+
+func NewUserService(repo UserRepository) *UserService {
+	return &UserService{repo: repo}
+}
+
+func (s *UserService) GetProfile(ctx context.Context, req *pb.GetProfileRequest) (*pb.User, error) {
+	return s.repo.GetProfile(ctx, req.UserId)
+}
+
+func (s *UserService) RegisterForCompetition(ctx context.Context, req *pb.RegisterForCompetitionRequest) (*emptypb.Empty, error) {
+	userID, ok := ctx.Value(middleware.UserIDKey{}).(string)
+	if !ok {
+		return nil, errors.New("user ID not found in context")
+	}
+
+	err := s.repo.RegisterForCompetition(ctx, userID, req.CompetitionId)
+	return &emptypb.Empty{}, err
+}
+
+func (s *UserService) UnregisterFromCompetition(ctx context.Context, req *pb.UnregisterFromCompetitionRequest) (*emptypb.Empty, error) {
+	userID, ok := ctx.Value(middleware.UserIDKey{}).(string)
+	if !ok {
+		return nil, errors.New("user ID not found in context")
+	}
+
+	err := s.repo.UnregisterFromCompetition(ctx, userID, req.CompetitionId)
+	return &emptypb.Empty{}, err
+}
+
+func (s *UserService) ListUserCompetitions(ctx context.Context, req *pb.ListUserCompetitionsRequest) (*pb.ListUserCompetitionsResponse, error) {
+	competitionIDs, err := s.repo.ListUserCompetitions(ctx, req.UserId)
+	if err != nil {
+		return nil, err
+	}
+	return &pb.ListUserCompetitionsResponse{CompetitionIds: competitionIDs}, nil
+}