feat: add get a game service and fake database

service/game_service.go

@@ -1,6 +1,9 @@
 package service
 
-import "hamster-tycoon/storage/dao"
+import (
+	"hamster-tycoon/storage/dao"
+	"hamster-tycoon/storage/model"
+)
 
 type GameService struct {
 	serviceContext
@@ -8,4 +11,20 @@ type GameService struct {
 
 func NewGameService(database dao.Database) *GameService {
 	return &GameService{serviceContext{db: database}}
-}
+}
+
+func (gs *GameService) GetAGameById(id string) (*model.Game, error) {
+	game, err := gs.db.GetGameById(id)
+	if err != nil {
+		if castedError, ok := err.(*dao.DAOError); ok {
+			switch castedError.Type {
+			case dao.ErrTypeNotFound:
+				return nil, &model.ErrNotFound
+			default:
+				return nil, &model.ErrInternalServer
+			}
+		}
+		return nil, &model.ErrInternalServer
+	}
+	return game, nil
+}