Add flag for visual interruptions refactor

Bug: 261728888
Test: presubmit
Flag: ACONFIG com.android.systemui.visual_interruptions_refactor DEVELOPMENT
Change-Id: I90b51ec94d3b0be452a78d41b7feff344b2cfb12
diff --git a/packages/SystemUI/aconfig/systemui.aconfig b/packages/SystemUI/aconfig/systemui.aconfig
index c26d5f5..8eff9bf 100644
--- a/packages/SystemUI/aconfig/systemui.aconfig
+++ b/packages/SystemUI/aconfig/systemui.aconfig
@@ -51,3 +51,11 @@
     description: "Enables the scene container framework go/flexiglass."
     bug: "283121968"
 }
+
+flag {
+    name: "visual_interruptions_refactor"
+    namespace: "systemui"
+    description: "Enables the refactored version of the code to decide when notifications "
+        "HUN, bubble, pulse, or FSI."
+    bug: "261728888"
+}
diff --git a/packages/SystemUI/src/com/android/systemui/statusbar/notification/interruption/VisualInterruptionRefactor.kt b/packages/SystemUI/src/com/android/systemui/statusbar/notification/interruption/VisualInterruptionRefactor.kt
new file mode 100644
index 0000000..2624363
--- /dev/null
+++ b/packages/SystemUI/src/com/android/systemui/statusbar/notification/interruption/VisualInterruptionRefactor.kt
@@ -0,0 +1,46 @@
+/*
+ * Copyright (C) 2023 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.systemui.statusbar.notification.interruption
+
+import com.android.systemui.Flags
+import com.android.systemui.flags.RefactorFlagUtils
+
+/** Helper for reading or using the visual interruptions refactor flag state. */
+object VisualInterruptionRefactor {
+    const val FLAG_NAME = Flags.FLAG_VISUAL_INTERRUPTIONS_REFACTOR
+
+    /** Whether the refactor is enabled */
+    @JvmStatic
+    inline val isEnabled
+        get() = Flags.visualInterruptionsRefactor()
+
+    /**
+     * Called to ensure code is only run when the flag is enabled. This protects users from the
+     * unintended behaviors caused by accidentally running new logic, while also crashing on an eng
+     * build to ensure that the refactor author catches issues in testing.
+     */
+    @JvmStatic
+    inline fun isUnexpectedlyInLegacyMode() =
+        RefactorFlagUtils.isUnexpectedlyInLegacyMode(isEnabled, FLAG_NAME)
+
+    /**
+     * Called to ensure code is only run when the flag is disabled. This will throw an exception if
+     * the flag is enabled to ensure that the refactor author catches issues in testing.
+     */
+    @JvmStatic
+    inline fun assertInLegacyMode() = RefactorFlagUtils.assertInLegacyMode(isEnabled, FLAG_NAME)
+}