Reset switch session on trigger changes and add DP2 force helper

app/service.py

@@ -80,6 +80,7 @@ class KvmSwitcherService:
         self._samsung_session_attempted = False
         self._samsung_session_successful = False
         self._samsung_session_attempt_count = 0
+        self._last_trigger_input_code: int | None = None
         self._state_lock = Lock()
         self._stop_event = Event()
         self._thread: Thread | None = None
@@ -115,7 +116,6 @@ class KvmSwitcherService:
     def poll_once(self) -> dict[str, Any]:
         config = self.config_store.get()
         scan = self.monitor_backend.scan()
-        self._update_samsung_session(scan.samsung_present)
 
         errors = list(scan.errors)
         errors.extend(config.validate())
@@ -124,6 +124,7 @@ class KvmSwitcherService:
             scan=scan,
             errors=errors,
         )
+        self._update_samsung_session(scan.samsung_present, trigger_input_code)
 
         ddm_slot = self.ddm_backend.resolve_alienware_slot(force=False)
         supports_monitor_targeting = bool(
@@ -242,18 +243,28 @@ class KvmSwitcherService:
                 return port_name
         return None
 
-    def _update_samsung_session(self, samsung_present: bool) -> None:
-        if samsung_present:
+    def _update_samsung_session(self, samsung_present: bool, trigger_input_code: int | None) -> None:
+        if not samsung_present:
+            self._samsung_session_active = False
+            self._samsung_session_attempted = False
+            self._samsung_session_successful = False
+            self._samsung_session_attempt_count = 0
+            self._last_trigger_input_code = None
+            return
+
         if not self._samsung_session_active:
             self._samsung_session_active = True
             self._samsung_session_attempted = False
             self._samsung_session_successful = False
             self._samsung_session_attempt_count = 0
-        else:
-            self._samsung_session_active = False
+            self._last_trigger_input_code = trigger_input_code
+            return
+
+        if trigger_input_code != self._last_trigger_input_code:
             self._samsung_session_attempted = False
             self._samsung_session_successful = False
             self._samsung_session_attempt_count = 0
+            self._last_trigger_input_code = trigger_input_code
 
     def _attempt_switch_sequence(
         self,
@@ -284,16 +295,16 @@ class KvmSwitcherService:
             verify_scan = self.monitor_backend.scan()
             scan = verify_scan
             errors.extend(verify_scan.errors)
-            self._update_samsung_session(verify_scan.samsung_present)
-
-            if not verify_scan.samsung_present:
-                return "waiting_for_reconnect", last_switch_at, scan, errors
-
             verify_trigger_input, _, _ = self._resolve_trigger_state(
                 config=config,
                 scan=verify_scan,
                 errors=errors,
             )
+            self._update_samsung_session(verify_scan.samsung_present, verify_trigger_input)
+
+            if not verify_scan.samsung_present:
+                return "waiting_for_reconnect", last_switch_at, scan, errors
+
             desired_codes = self._port_input_codes(desired_port)
             if verify_trigger_input not in desired_codes:
                 return "waiting_for_trigger_match", last_switch_at, scan, errors

monitorcontrol_main.py

@@ -1,7 +1,22 @@
-from monitorcontrol import get_monitors, InputSource
+from monitorcontrol import get_monitors
+
+
+TARGET_MODEL = "AW3423DWF"
+DP2_CODE = 19
+
 
 for monitor in get_monitors():
+    description = str(getattr(getattr(monitor, "vcp", None), "description", "") or str(monitor))
+    if TARGET_MODEL not in description.upper():
+        continue
+
+    try:
         with monitor:
-        print(monitor.vcp.description)
-        input_source_raw: int = monitor.get_input_source()
-        print(InputSource(input_source_raw).name)
+            monitor.set_input_source(DP2_CODE)
+        print(f"Target: {description}")
+        print(f"Forced DP2 code {DP2_CODE}.")
+    except Exception as exc:
+        print(f"Failed forcing DP2 on {description}: {exc}")
+    break
+else:
+    print(f"Monitor {TARGET_MODEL} not found.")

tests/test_app.py

@@ -441,3 +441,87 @@ def test_polling_switches_when_alienware_input_is_unreadable() -> None:
     assert status["last_switch_result"] == "switched_unverified"
     assert status["samsung_session_successful"] is True
     assert backend.calls == [(1, "DP1")]
+
+
+def test_polling_resets_session_when_trigger_changes_without_disconnect() -> None:
+    service_module = _require_module("app.service")
+    hardware_module = _require_module("app.hardware")
+    ddm_module = _require_module("app.ddm")
+
+    KvmSwitcherService = getattr(service_module, "KvmSwitcherService", None)
+    HardwareScan = getattr(hardware_module, "HardwareScan", None)
+    DDMCommandResult = getattr(ddm_module, "DDMCommandResult", None)
+    if KvmSwitcherService is None or HardwareScan is None or DDMCommandResult is None:
+        pytest.skip("Service backend interfaces are not available yet.")
+
+    class FakeMonitorBackend:
+        def __init__(self) -> None:
+            self.call_count = 0
+
+        def scan(self):
+            self.call_count += 1
+            if self.call_count == 1:
+                return HardwareScan(
+                    samsung_present=True,
+                    trigger_input_code=19,
+                    alienware_detected=True,
+                    alienware_input_code=19,
+                    errors=[],
+                )
+            if self.call_count == 2:
+                return HardwareScan(
+                    samsung_present=True,
+                    trigger_input_code=15,
+                    alienware_detected=True,
+                    alienware_input_code=15,
+                    errors=[],
+                )
+            if self.call_count == 3:
+                return HardwareScan(
+                    samsung_present=True,
+                    trigger_input_code=19,
+                    alienware_detected=True,
+                    alienware_input_code=15,
+                    errors=[],
+                )
+            return HardwareScan(
+                samsung_present=True,
+                trigger_input_code=19,
+                alienware_detected=True,
+                alienware_input_code=19,
+                errors=[],
+            )
+
+    class FakeDDMBackend:
+        def __init__(self) -> None:
+            self.calls: list[tuple[int, str]] = []
+
+        def is_available(self) -> bool:
+            return True
+
+        def resolve_alienware_slot(self, force: bool = False) -> int | None:
+            return 1
+
+        def invalidate_slot(self) -> None:
+            return None
+
+        def switch_to_port(self, slot: int, port_name: str):
+            self.calls.append((slot, port_name))
+            return DDMCommandResult(True, "ok")
+
+    config_path = Path(tempfile.mkdtemp()) / "config.json"
+    backend = FakeDDMBackend()
+    service = KvmSwitcherService(
+        config_store=ConfigStore(config_path),
+        monitor_backend=FakeMonitorBackend(),
+        ddm_backend=backend,
+        poll_interval_seconds=0.01,
+        retry_wait_seconds=0.0,
+    )
+    first = service.save_settings(device_port="DP2")
+    assert first["last_switch_result"] == "noop"
+    second = service.poll_once()
+    assert second["last_switch_result"] == "waiting_for_trigger_match"
+    third = service.poll_once()
+    assert third["last_switch_result"] == "switched"
+    assert backend.calls == [(1, "DP2")]