decompose structure

src/features/current/model.ts

@@ -0,0 +1,37 @@
+import type { CurrentItem } from '../../entities/current/types';
+
+export function getCurrentItemLabel(item: CurrentItem): string {
+  return item.name?.trim() || item.tag;
+}
+
+export function createCurrentTagLabels(items: CurrentItem[]): Record<string, string> {
+  return Object.fromEntries(items.map((item) => [item.tag, getCurrentItemLabel(item)]));
+}
+
+export function filterCurrentItems(items: CurrentItem[], search: string): CurrentItem[] {
+  const query = search.trim().toLowerCase();
+  if (!query) {
+    return items;
+  }
+
+  return items.filter((item) =>
+    [item.tag, item.name, item.comment, item.tagGroup, item.unitOfMeasurement]
+      .filter(Boolean)
+      .join(' ')
+      .toLowerCase()
+      .includes(query),
+  );
+}
+
+export function getLatestCurrentUpdatedAt(items: CurrentItem[]): Date | undefined {
+  const latest = items.reduce<number | null>((max, item) => {
+    const updatedAt = new Date(item.updatedAt).getTime();
+    return Number.isFinite(updatedAt) && (max === null || updatedAt > max) ? updatedAt : max;
+  }, null);
+
+  return latest === null ? undefined : new Date(latest);
+}
+
+export function countLiveCurrentItems(items: CurrentItem[], now = Date.now()): number {
+  return items.filter((item) => (now - new Date(item.time).getTime()) / 1000 <= 30).length;
+}