Backend moved to a separate repository

src/main/core/userDisplay.ts

@@ -0,0 +1,51 @@
+import { parseApiTimestamp } from "@/utils/utils";
+
+const DELETED_USERNAME_PREFIX = "#deleted";
+
+export function isDeletedUser(user: { deleted?: boolean }): boolean {
+    return Boolean(user.deleted);
+}
+
+export function isSuspendedUser(user: { suspended?: boolean; deleted?: boolean }): boolean {
+    return Boolean(user.suspended) && !user.deleted;
+}
+
+export function isDeletedAccountUsername(username: string | undefined | null): boolean {
+    return Boolean(username?.startsWith(DELETED_USERNAME_PREFIX));
+}
+
+export function isDeletedPeer(user: {
+    id?: number;
+    deleted?: boolean;
+    username?: string | null;
+}): boolean {
+    return isDeletedUser(user) || isDeletedAccountUsername(user.username);
+}
+
+export const DELETED_ACCOUNT_LABEL = "Deleted account";
+
+export function deletedUserLabel(): string {
+    return DELETED_ACCOUNT_LABEL;
+}
+
+export function displayNameForUser(user: {
+    id?: number;
+    display_name?: string | null;
+    username?: string | null;
+    deleted?: boolean;
+}): string {
+    if (isDeletedPeer(user)) {
+        return deletedUserLabel();
+    }
+    return user.display_name?.trim() || user.username?.trim() || "";
+}
+
+export function isEpochLastSeen(lastSeen: string | undefined | null): boolean {
+    if (!lastSeen) return false;
+    const time = parseApiTimestamp(lastSeen).getTime();
+    return !Number.isNaN(time) && time <= 0;
+}
+
+export function formatDeletedUserLastSeen(): string {
+    return "был(а) давно";
+}