refactoring categories

src/modules/cars/useCases/listCategories/ListCategoriesController.ts

@@ -0,0 +1,15 @@
+import { Request, Response } from "express";
+
+import { ListCategoriesUseCase } from "./ListCategoriesUseCase";
+
+class ListCategoriesController {
+  constructor(private listCategoriesUseCase: ListCategoriesUseCase) {}
+
+  handle(request: Request, response: Response): Response {
+    const all = this.listCategoriesUseCase.execute();
+
+    return response.json(all);
+  }
+}
+
+export { ListCategoriesController };

src/modules/cars/useCases/listCategories/ListCategoriesUseCase.ts

@@ -0,0 +1,14 @@
+import { Category } from "../../model/Category";
+import { ICategoriesRepository } from "../../repositories/ICategoriesRepository";
+
+class ListCategoriesUseCase {
+  constructor(private categoriesRepository: ICategoriesRepository) {}
+
+  execute(): Category[] {
+    const categories = this.categoriesRepository.list();
+
+    return categories;
+  }
+}
+
+export { ListCategoriesUseCase };

src/modules/cars/useCases/listCategories/index.ts

@@ -0,0 +1,11 @@
+import { CategoriesRepository } from "../../repositories/CategoriesRepository";
+import { ListCategoriesController } from "./ListCategoriesController";
+import { ListCategoriesUseCase } from "./ListCategoriesUseCase";
+
+const categoriesRepository = new CategoriesRepository();
+const listCategoriesUseCase = new ListCategoriesUseCase(categoriesRepository);
+const listCategoriesController = new ListCategoriesController(
+  listCategoriesUseCase
+);
+
+export { listCategoriesController };

src/routes/categories.routes.ts

@@ -1,19 +1,16 @@
 import { Router } from "express";
 
-import { CategoriesRepository } from "../modules/cars/repositories/CategoriesRepository";
 import { createCategoryController } from "../modules/cars/useCases/createCategory";
+import { listCategoriesController } from "../modules/cars/useCases/listCategories";
 
 const categoriesRoutes = Router();
-const categoriesRepository = new CategoriesRepository();
 
 categoriesRoutes.post("/", (request, response) => {
   return createCategoryController.handle(request, response);
 });
 
 categoriesRoutes.get("/", (request, response) => {
-  const all = categoriesRepository.list();
-
-  return response.json(all);
+  return listCategoriesController.handle(request, response);
 });
 
 export { categoriesRoutes };