add reason hover card

orders-events/app/events/start_fulfillment.py

@@ -19,7 +19,7 @@ from layercake.dynamodb import (
     TransactKey,
 )
 from layercake.strutils import md5_hash
-from pydantic import UUID4, BaseModel, BeforeValidator, Field, FutureDate
+from pydantic import UUID4, BaseModel, BeforeValidator, Field
 
 from boto3clients import dynamodb_client
 from config import (
@@ -42,6 +42,9 @@ class DeduplicationConflictError(Exception): ...
 class EnrollmentConflictError(Exception): ...
 
 
+class DeadlineExceededError(Exception): ...
+
+
 class User(BaseModel):
     id: str
     name: str
@@ -200,9 +203,12 @@ def _get_courses(ids: set[str]) -> tuple[Course, ...]:
 
 
 def _friendly_reason(reason: str) -> str:
-    if reason == 'DeduplicationConflictError':
-        return 'DEDUPLICATION'
-    return 'CONFLICT'
+    reasons = {
+        'DeduplicationConflictError': 'DEDUPLICATION',
+        'DeadlineExceededError': 'DEADLINE',
+    }
+
+    return reasons.get(reason, 'CONFLICT')
 
 
 CreatedBy = TypedDict('CreatedBy', {'user_id': str, 'name': str})
@@ -341,6 +347,9 @@ def _enroll_later(enrollment: Enrollment, context: Context) -> None:
     scheduled_for = _date_to_midnight(enrollment.scheduled_for)  # type: ignore
     lock_hash = md5_hash(f'{user.id}{course.id}')
 
+    if now_ > scheduled_for:
+        raise DeadlineExceededError('Deadline exceeded')
+
     with dyn.transact_writer(table_name=ENROLLMENT_TABLE) as transact:
         pk = f'SCHEDULED#ORG#{org.id}'
         sk = f'{scheduled_for.isoformat()}#{lock_hash}'