Fleshout some of the notifcation service

This is probably organized incorrectly. If it's a service it should
be grouped with the other services

src/notifications/service.py

@@ -1,12 +1,55 @@
-from typing import Any
-from .data import Notification
 import abc
+from typing import Any
+
+from src.services.email import EmailService
+from src.config import Config
+
+from .data import Notification
+
+# MUSTFIX: Needs real users!
 
 
-class NotificationService(abc.ABC):
+class NotificationSender(abc.ABC):
     """A service that sends notifications to the user"""
 
+    def __init__(self, name: str):
+        self._name = name
+
+    @property
+    def name(self):
+        return self._name
+
     @abc.abstractmethod
     def notify(self, user: Any, notification: Notification):
         """Send a notification"""
         pass
+
+
+class NotificationService:
+    def __init__(self):
+        self._senders = []
+
+    def register_sender(self, sender: NotificationSender):
+        self._senders.append(sender)
+
+    def notify_user(self, user: Any, notification: Notification):
+        for s in self._senders:
+            if s.name in user.notification_methods:
+                s.notify(user, notification)
+
+
+class EmailNotifier(NotificationSender):
+    def __init__(self, email_service: EmailService):
+        super().__init__('email')
+        self._email_service = email_service
+
+    def notify(self, user: Any, notification: Notification):
+        # TODO: Convert notification and user information into an EmailDTO for the email service
+        pass
+
+
+def make_notification_service(email_service: EmailService):
+    service = NotificationService()
+    service.register_sender(EmailNotifier(email_service))
+
+    return service