add statistics storage

internal/service/statistics.go

@@ -1,13 +1,27 @@
 package service
 
-import "beadstest/internal/storage"
+import (
+	"beadstest/internal/models"
+	"beadstest/internal/storage"
+	"errors"
+)
 
 type StatisticsService struct {
-	storage *storage.StatisticsStorage
+	storage *storage.Storage[models.Statistics]
 }
 
-func NewStatisticsService(storage *storage.StatisticsStorage) *StatisticsService {
+func NewStatisticsService(storage *storage.Storage[models.Statistics]) (*StatisticsService, error) {
+	if err := storage.Init(); err != nil {
+		return nil, err
+	}
 	return &StatisticsService{
 		storage: storage,
-	}
+	}, nil
+}
+
+func (s *StatisticsService) GetStatistics() (models.Statistics, error) {
+	if s.storage.Data == nil {
+		return models.Statistics{}, errors.New("statistics data not initialized")
+	}
+	return *s.storage.Data, nil
 }