feat(app): restyle the inbox and message preview surfaces (#1706)

fluxer_app/src/features/user/state/UnreadInboxVisibility.ts

@@ -0,0 +1,26 @@
+// SPDX-License-Identifier: AGPL-3.0-or-later
+
+import {MessageNotifications} from '@fluxer/constants/src/NotificationConstants';
+
+export interface UnreadInboxVisibilityInput {
+	unreadBadgesLevel: number | null;
+	isMuted: boolean;
+	hasUnread: boolean;
+	hasMentions: boolean;
+}
+
+export function resolveUnreadInboxVisibility(input: UnreadInboxVisibilityInput): boolean {
+	if (!input.hasUnread && !input.hasMentions) {
+		return false;
+	}
+	if (input.unreadBadgesLevel === MessageNotifications.NO_MESSAGES) {
+		return false;
+	}
+	if (input.hasMentions) {
+		return true;
+	}
+	if (input.isMuted) {
+		return false;
+	}
+	return input.unreadBadgesLevel !== MessageNotifications.ONLY_MENTIONS;
+}