feat(server): implement training by slug endpoint

internal/server/api.go

@@ -176,6 +176,41 @@ func (h *APIHandlers) GetTraining(ctx context.Context, req GetTrainingRequestObj
 	}, nil
 }
 
+func (h *APIHandlers) GetTrainingBySlug(ctx context.Context, req GetTrainingBySlugRequestObject) (GetTrainingBySlugResponseObject, error) {
+	t, err := h.trainingRepository.FindBySlug(req.TrainingSlug)
+	if errors.Is(err, training.ErrTrainingNotFound) {
+		return GetTrainingBySlug404ApplicationProblemPlusJSONResponse{
+			NotFoundErrorApplicationProblemPlusJSONResponse: NotFoundErrorApplicationProblemPlusJSONResponse{
+				Status: fiber.StatusNotFound,
+				Title:  "Not Found: Training not found",
+			}}, nil
+	} else if err != nil {
+		return GetTrainingBySlug500ApplicationProblemPlusJSONResponse{
+			InternalErrorApplicationProblemPlusJSONResponse: InternalErrorApplicationProblemPlusJSONResponse{
+				Status: fiber.StatusInternalServerError,
+				Title:  "Internal Server Error: Failed to get training",
+				Detail: err.Error(),
+			}}, nil
+	}
+
+	pricing := make([]TrainingPrice, len(t.Pricing))
+	for idx, p := range t.Pricing {
+		pricing[idx] = TrainingPrice{
+			Amount:   p.Amount.String(),
+			Currency: p.Currency,
+			Type:     TrainingPriceType(p.Type),
+		}
+	}
+	return GetTrainingBySlug200JSONResponse{
+		Id:          t.ID,
+		Name:        t.Name,
+		Slug:        t.Slug,
+		Days:        t.Days,
+		Description: t.Description,
+		Pricing:     pricing,
+	}, nil
+}
+
 func (h *APIHandlers) UpdateTraining(ctx context.Context, req UpdateTrainingRequestObject) (UpdateTrainingResponseObject, error) {
 	pricing := make([]training.Price, len(req.Body.Pricing))
 	for idx, p := range req.Body.Pricing {