web: migrate admin overview cards to separate files

web/src/pages/admin-overview/cards/WorkerStatusCard.ts

@@ -0,0 +1,28 @@
+import { gettext } from "django";
+import { customElement } from "lit-element";
+import { DefaultClient, PBResponse } from "../../../api/client";
+import { AdminStatus, AdminStatusCard } from "./AdminStatusCard";
+
+@customElement("ak-admin-status-card-workers")
+export class WorkersStatusCard extends AdminStatusCard<number> {
+
+    getPrimaryValue(): Promise<number> {
+        return DefaultClient.fetch<PBResponse<number>>(["admins", "workers"]).then((r) => {
+            return r.pagination.count;
+        });
+    }
+
+    getStatus(value: number): Promise<AdminStatus> {
+        if (value < 1) {
+            return Promise.resolve<AdminStatus>({
+                icon: "fa fa-exclamation-triangle",
+                message: gettext("No workers connected. Background tasks will not run."),
+            });
+        } else {
+            return Promise.resolve<AdminStatus>({
+                icon: "fa fa-check-circle"
+            });
+        }
+    }
+
+}