From a31634122601eb9e602f03eea91b8594abb7bccb Mon Sep 17 00:00:00 2001
From: Albrecht Degering <albrecht@degering.name>
Date: Wed, 22 Jul 2026 03:21:10 +0200
Subject: [PATCH] refactor(scheduling): consume core participation contract

---
 src/govoplan_scheduling/backend/manifest.py |  6 ++--
 src/govoplan_scheduling/backend/service.py  | 24 +++++++-------
 tests/test_module_boundary.py               | 35 +++++++++++++++++++++
 3 files changed, 50 insertions(+), 15 deletions(-)
 create mode 100644 tests/test_module_boundary.py

diff --git a/src/govoplan_scheduling/backend/manifest.py b/src/govoplan_scheduling/backend/manifest.py
index 92e1de6..e0bcaa0 100644
--- a/src/govoplan_scheduling/backend/manifest.py
+++ b/src/govoplan_scheduling/backend/manifest.py
@@ -18,14 +18,14 @@ from govoplan_core.core.modules import (
     PublicFrontendRoute,
     RoleTemplate,
 )
-from govoplan_core.db.base import Base
-from govoplan_core.core.poll import CAPABILITY_POLL_SCHEDULING
 from govoplan_core.core.people import (
     CAPABILITY_ACCESS_PEOPLE_SEARCH,
     CAPABILITY_ADDRESSES_PEOPLE_SEARCH,
 )
+from govoplan_core.core.poll import CAPABILITY_POLL_SCHEDULING
+from govoplan_core.core.poll_participation import CAPABILITY_POLL_PARTICIPATION_GATEWAY
 from govoplan_core.core.policy import CAPABILITY_POLICY_SCHEDULING_PARTICIPANT_PRIVACY
-from govoplan_poll.backend.participation import CAPABILITY_POLL_PARTICIPATION_GATEWAY
+from govoplan_core.db.base import Base
 from govoplan_scheduling.backend.db import models as scheduling_models  # noqa: F401 - populate Scheduling ORM metadata
 
 MODULE_ID = "scheduling"
diff --git a/src/govoplan_scheduling/backend/service.py b/src/govoplan_scheduling/backend/service.py
index 06a38d5..a6873ac 100644
--- a/src/govoplan_scheduling/backend/service.py
+++ b/src/govoplan_scheduling/backend/service.py
@@ -27,6 +27,18 @@ from govoplan_core.core.poll import (
     PollUpdateCommand,
     poll_scheduling_provider,
 )
+from govoplan_core.core.poll_participation import (
+    ANONYMOUS_PASSWORD_REQUIREMENT,
+    PollGovernedInvitationCommand,
+    PollGovernedResponseCommand,
+    PollGovernedResponseRef,
+    PollParticipationContextRef,
+    PollParticipationGatewayProvider,
+    PollParticipationPolicy,
+    PollResponseGatewayRef,
+    participation_token_fingerprint,
+    poll_participation_gateway_provider,
+)
 from govoplan_core.core.policy import (
     SchedulingParticipantPrivacyDecision,
     SchedulingParticipantPrivacyRequest,
@@ -55,18 +67,6 @@ from govoplan_scheduling.backend.security import (
     hash_participant_password,
     verify_participant_password,
 )
-from govoplan_poll.backend.participation import (
-    ANONYMOUS_PASSWORD_REQUIREMENT,
-    PollGovernedInvitationCommand,
-    PollGovernedResponseCommand,
-    PollGovernedResponseRef,
-    PollParticipationContextRef,
-    PollParticipationGatewayProvider,
-    PollParticipationPolicy,
-    PollResponseGatewayRef,
-    participation_token_fingerprint,
-    poll_participation_gateway_provider,
-)
 
 
 class SchedulingError(ValueError):
diff --git a/tests/test_module_boundary.py b/tests/test_module_boundary.py
new file mode 100644
index 0000000..464bfba
--- /dev/null
+++ b/tests/test_module_boundary.py
@@ -0,0 +1,35 @@
+from __future__ import annotations
+
+import ast
+import pathlib
+import unittest
+
+
+ROOT = pathlib.Path(__file__).resolve().parents[1]
+
+
+class SchedulingModuleBoundaryTests(unittest.TestCase):
+    def test_runtime_source_does_not_import_poll_implementation_internals(self) -> None:
+        offenders: list[str] = []
+        source_root = ROOT / "src" / "govoplan_scheduling"
+        for path in source_root.rglob("*.py"):
+            tree = ast.parse(path.read_text(encoding="utf-8"))
+            imported_modules = [
+                node.module
+                for node in ast.walk(tree)
+                if isinstance(node, ast.ImportFrom) and node.module is not None
+            ]
+            imported_modules.extend(
+                alias.name
+                for node in ast.walk(tree)
+                if isinstance(node, ast.Import)
+                for alias in node.names
+            )
+            if any(module.startswith("govoplan_poll") for module in imported_modules):
+                offenders.append(str(path.relative_to(ROOT)))
+
+        self.assertEqual([], offenders)
+
+
+if __name__ == "__main__":
+    unittest.main()