Add CallEventGrouper as a replacement for TimeLineCallEventStore

Signed-off-by: Šimon Brandner <simon.bra.ag@gmail.com>

src/components/structures/CallEventGrouper.tsx

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+/*
+Copyright 2021 Šimon Brandner <simon.bra.ag@gmail.com>
+
+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 { EventType } from "matrix-js-sdk/src/@types/event";
+import { MatrixEvent } from "matrix-js-sdk/src/models/event";
+
+export interface TimelineCallState {
+    callId?: string;
+    isVoice: boolean;
+}
+
+export default class CallEventGrouper {
+    invite: MatrixEvent;
+
+    private isVoice(): boolean {
+        const invite = this.invite;
+
+        // FIXME: Find a better way to determine this from the event?
+        let isVoice = true;
+        if (
+            invite.getContent().offer && invite.getContent().offer.sdp &&
+            invite.getContent().offer.sdp.indexOf('m=video') !== -1
+        ) {
+            isVoice = false;
+        }
+
+        return isVoice;
+    }
+
+    public add(event: MatrixEvent) {
+        if (event.getType() === EventType.CallInvite) this.invite = event;
+    }
+
+    public getState(): TimelineCallState {
+        return {
+            isVoice: this.isVoice(),
+        }
+    }
+}