Implement a use case for fetching a list of all available categories …

…and cetegory detail

lib/src/category/domain/repository/category_repository.dart

@@ -0,0 +1,14 @@
+import 'package:dartz/dartz.dart';
+import 'package:hadeeth/core/error/failures.dart';
+import 'package:hadeeth/src/category/domain/entities/category.dart';
+import 'package:hadeeth/src/category/domain/entities/category_detail.dart';
+
+abstract class CategoryRepository {
+  Future<Either<Failure, List<Category>>> getAllCategories(
+      {required String lang});
+  Future<Either<Failure, CategoryDetail>> getCategoryDetail(
+      {required String lang,
+      required String categoryId,
+      required String page,
+      required String perPage});
+}

lib/src/category/domain/usecases/all_categories_usecase.dart

@@ -0,0 +1,13 @@
+import 'package:dartz/dartz.dart';
+import 'package:hadeeth/core/error/failures.dart';
+import 'package:hadeeth/src/category/domain/entities/category.dart';
+import 'package:hadeeth/src/category/domain/repository/category_repository.dart';
+
+class AllCategoriesUsecase {
+  final CategoryRepository categoryRepo;
+  const AllCategoriesUsecase({required this.categoryRepo});
+  Future<Either<Failure, List<Category>>> getAllCategories(
+      {String lang = 'ar'}) async {
+    return await categoryRepo.getAllCategories(lang: lang);
+  }
+}

lib/src/category/domain/usecases/category_detail_usecase.dart

@@ -0,0 +1,17 @@
+import 'package:dartz/dartz.dart';
+import 'package:hadeeth/core/error/failures.dart';
+import 'package:hadeeth/src/category/domain/entities/category_detail.dart';
+import 'package:hadeeth/src/category/domain/repository/category_repository.dart';
+
+class CategoryDetailUsecase {
+  final CategoryRepository categoryRepo;
+  const CategoryDetailUsecase({required this.categoryRepo});
+  Future<Either<Failure, CategoryDetail>> getCategoryDetail(
+      {required String categoryId,
+      String lang = 'ar',
+      String page = '1',
+      String perPage = '20'}) async {
+    return await categoryRepo.getCategoryDetail(
+        lang: lang, categoryId: categoryId, page: page, perPage: perPage);
+  }
+}