add competition service (it`s broken, I will fix it later)

internal/competition/service/competition.go

@@ -0,0 +1,75 @@
+package service
+
+import (
+	"context"
+	"time"
+
+	"datarush/internal/competition/domain"
+	"datarush/internal/competition/repository"
+
+	"github.com/google/uuid"
+)
+
+type Service struct {
+	repo repository.CompetitionRepository
+}
+
+func NewService(repo repository.CompetitionRepository) *Service {
+	return &Service{repo: repo}
+}
+
+func (s *Service) CreateCompetition(ctx context.Context, comp *domain.Competition) (*domain.Competition, error) {
+	now := time.Now()
+	if comp.ID == uuid.Nil {
+		comp.ID = uuid.New()
+	}
+	comp.CreatedAt = now
+	comp.UpdatedAt = now
+
+	if err := s.repo.Create(ctx, comp); err != nil {
+		return nil, err
+	}
+	return comp, nil
+}
+
+func (s *Service) GetCompetition(ctx context.Context, id uuid.UUID) (*domain.Competition, error) {
+	return s.repo.Get(ctx, id)
+}
+
+func (s *Service) EditCompetition(ctx context.Context, comp *domain.Competition) (*domain.Competition, error) {
+	comp.UpdatedAt = time.Now()
+	if err := s.repo.Update(ctx, comp); err != nil {
+		return nil, err
+	}
+	return s.repo.Get(ctx, comp.ID)
+}
+
+func (s *Service) DeleteCompetition(ctx context.Context, id uuid.UUID) error {
+	return s.repo.Delete(ctx, id)
+}
+
+func (s *Service) ListCompetitions(ctx context.Context, pageSize int32, pageToken int32, state *domain.CompetitionState, isParticipating *bool, searchQuery *string) ([]domain.Competition, int32, int32, error) {
+	opts := repository.ListCompetitionsOptions{
+		Page:            int(pageToken),
+		PageSize:        int(pageSize),
+		State:           state,
+		IsParticipating: isParticipating,
+		SearchQuery:     searchQuery,
+	}
+
+	competitions, total, err := s.repo.List(ctx, opts)
+	if err != nil {
+		return nil, 0, 0, err
+	}
+
+	var nextPageToken int32
+	if (opts.Page+1)*opts.PageSize < total {
+		nextPageToken = int32(opts.Page + 1)
+	}
+
+	return competitions, int32(total), nextPageToken, nil
+}
+
+func (s *Service) ChangeCompetitionState(ctx context.Context, id uuid.UUID, state domain.CompetitionState) (*domain.Competition, error) {
+	return s.repo.ChangeState(ctx, id, state)
+}