Extract place call logic to its own file (#11494)

* Extract place call logic to its own file

* Simplify makeCall by not using useCallback

* lint fix

src/utils/room/placeCall.ts

@@ -0,0 +1,55 @@
+/*
+Copyright 2023 The Matrix.org Foundation C.I.C.
+
+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.
+*/
+
+import { CallType } from "matrix-js-sdk/src/webrtc/call";
+import { Room } from "matrix-js-sdk/src/matrix";
+
+import LegacyCallHandler from "../../LegacyCallHandler";
+import { PlatformCallType } from "../../hooks/room/useRoomCallStatus";
+import defaultDispatcher from "../../dispatcher/dispatcher";
+import { ViewRoomPayload } from "../../dispatcher/payloads/ViewRoomPayload";
+import { Action } from "../../dispatcher/actions";
+
+/**
+ * Helper to place a call in a room that works with all the legacy modes
+ * @param room the room to place the call in
+ * @param callType the type of call
+ * @param platformCallType the platform to pass the call on
+ */
+export const placeCall = async (room: Room, callType: CallType, platformCallType: PlatformCallType): Promise<void> => {
+    switch (platformCallType) {
+        case "legacy_or_jitsi":
+            await LegacyCallHandler.instance.placeCall(room.roomId, callType);
+            break;
+        // TODO: Remove the jitsi_or_element_call case and
+        // use the commented code below
+        case "element_call":
+        case "jitsi_or_element_call":
+            defaultDispatcher.dispatch<ViewRoomPayload>({
+                action: Action.ViewRoom,
+                room_id: room.roomId,
+                view_call: true,
+                metricsTrigger: undefined,
+            });
+            break;
+
+        // case "jitsi_or_element_call":
+        // TODO: Open dropdown menu to choice between
+        // EC and Jitsi. Waiting on Compound's dropdown
+        // component
+        // break;
+    }
+};