add story service

internal/services/story_storage/service.go

@@ -0,0 +1,45 @@
+package story_storage
+
+import (
+	"context"
+	"encoding/json"
+	"evening_detective/internal/services/story_service"
+	"fmt"
+	"log"
+	"os"
+)
+
+type service struct {
+	filepath string
+}
+
+func NewStoryStorage(filepath string) story_service.IStoryStorage {
+	return &service{
+		filepath: filepath,
+	}
+}
+
+func (s *service) Load(ctx context.Context) (*story_service.Story, error) {
+	data, err := os.ReadFile(s.filepath)
+	if err != nil {
+		return nil, fmt.Errorf("story file %s not found", s.filepath)
+	}
+	log.Printf("load story from: %s", s.filepath)
+	story := &story_service.Story{}
+	if err := json.Unmarshal(data, story); err != nil {
+		return nil, err
+	}
+	return story, nil
+}
+
+func (s *service) Save(ctx context.Context, story *story_service.Story) error {
+	data, err := json.Marshal(story)
+	if err != nil {
+		return err
+	}
+	if err := os.WriteFile(s.filepath, data, 0x777); err != nil {
+		return err
+	}
+	log.Printf("save story to: %s", s.filepath)
+	return nil
+}