Add wallet balance to User model and implement Atoll/Island management

- Added `wallet_balance` field to the User model.
- Updated UserAdmin to include `wallet_balance` in the admin interface.
- Created serializers and views for Atoll and Island management.
- Implemented endpoints for listing, creating, and updating Atolls and Islands.
- Enhanced payment processing with UUIDs for Payment and Topup models.
- Added migration files for new fields and constraints.
- Improved error handling and validation in various views.
- Updated email templates for better responsiveness and SEO.

devices/views.py

@@ -2,7 +2,11 @@ from rest_framework import generics, status
 from rest_framework.response import Response
 from django_filters.rest_framework import DjangoFilterBackend
 from .models import Device
-from .serializers import CreateDeviceSerializer, DeviceSerializer, ReadOnlyDeviceSerializer
+from .serializers import (
+    CreateDeviceSerializer,
+    DeviceSerializer,
+    ReadOnlyDeviceSerializer,
+)
 from api.mixins import StaffEditorPermissionMixin
 from .filters import DeviceFilter
 import re
@@ -27,16 +31,17 @@ class DeviceListCreateAPIView(
     def create(self, request, *args, **kwargs):
         mac = request.data.get("mac", None)
         if not re.match(r"^([0-9A-Fa-f]{2}([.:-]?)){5}[0-9A-Fa-f]{2}$", mac):
-            return Response({"error": "Invalid mac address"}, status=400)
+            return Response({"message": "Invalid mac address."}, status=400)
         if Device.objects.filter(mac=mac).exists():
-            return Response({"error": "Device with this mac already exists"}, status=400)
+            return Response(
+                {"message": "Device with this mac address already exists."}, status=400
+            )
         return super().create(request, *args, **kwargs)
 
     def perform_create(self, serializer):
         serializer.save(user=self.request.user)
 
 
-
 class DeviceDetailAPIView(StaffEditorPermissionMixin, generics.RetrieveAPIView):
     queryset = Device.objects.select_related("user").all()
     serializer_class = ReadOnlyDeviceSerializer
@@ -52,6 +57,9 @@ class DeviceUpdateAPIView(StaffEditorPermissionMixin, generics.UpdateAPIView):
         # Pass 'partial=True' to allow partial updates
         partial = kwargs.pop("partial", True)
         instance = self.get_object()
+        mac = request.data.get("mac", None)
+        if not re.match(r"^([0-9A-Fa-f]{2}([.:-]?)){5}[0-9A-Fa-f]{2}$", mac):
+            return Response({"message": "Invalid mac address"}, status=400)
         serializer = self.get_serializer(instance, data=request.data, partial=partial)
         serializer.is_valid(raise_exception=True)
         self.perform_update(serializer)
@@ -73,4 +81,3 @@ class DeviceDestroyAPIView(StaffEditorPermissionMixin, generics.DestroyAPIView):
             {"message": f"Device '{device_name}' deleted."},
             status=status.HTTP_200_OK,
         )
-