Implement task API with input validation; implement error handling; refactoring

tofu_api/api/tasks/task_handler.py

@@ -0,0 +1,50 @@
+from tofu_api.models import Task
+from tofu_api.repositories import TaskRepository
+from .validators import TaskCreateData, TaskUpdateData
+
+
+class TaskHandler:
+    """
+    Handles operations on tasks.
+    """
+
+    task_repository: TaskRepository
+
+    def __init__(self, *, task_repository: TaskRepository):
+        self.task_repository = task_repository
+
+    def fetch_task(self, task_id: int) -> Task:
+        """
+        Fetches a single task by its ID from the database.
+        Raises an ObjectNotFoundError if the task was not found.
+        """
+        return self.task_repository.fetch_by_id(task_id)
+
+    def fetch_all_tasks(self) -> list[Task]:
+        """
+        Fetches a list of all tasks.
+        """
+        return self.task_repository.fetch_all()
+
+    def create_task(self, create_data: TaskCreateData) -> Task:
+        """
+        Creates a new task, saves it to the database and returns it.
+        """
+        task = Task()
+        task.update_from(create_data)
+        self.task_repository.save_resource(task)
+        return task
+
+    def update_task(self, task: Task, update_data: TaskUpdateData) -> Task:
+        """
+        Updates a Task object with new data.
+        """
+        task.update_from(update_data)
+        self.task_repository.save_resource(task)
+        return task
+
+    def delete_task(self, task: Task) -> None:
+        """
+        Deletes a task from the database.
+        """
+        self.task_repository.delete_resource(task)