refactor(k8s): namespace core logic (#12142)

Co-authored-by: testA113 <aliharriss1995@gmail.com>
Co-authored-by: Anthony Lapenna <anthony.lapenna@portainer.io>
Co-authored-by: James Carppe <85850129+jamescarppe@users.noreply.github.com>
Co-authored-by: Ali <83188384+testA113@users.noreply.github.com>

app/react/kubernetes/more-resources/ClusterRolesView/utils.ts

@@ -0,0 +1,52 @@
+import { Row } from '@tanstack/react-table';
+
+import { RoleBinding } from '../RolesView/RoleBindingsDatatable/types';
+
+import { ClusterRoleBinding } from './ClusterRoleBindingsDatatable/types';
+
+/**
+ * Transforms the rows of a table to get a unique list of namespaces to use as filter options.
+ * One row can have multiple subject namespaces.
+ * @param rows - The rows of the table.
+ * @param id - The ID of the column containing the subject namespaces.
+ * @returns An array of unique subject namespace options.
+ */
+export function filterNamespaceOptionsTransformer<
+  TData extends ClusterRoleBinding | RoleBinding,
+>(rows: Row<TData>[], id: string) {
+  const options = new Set<string>();
+  rows.forEach(({ getValue }) => {
+    const value = getValue<string[]>(id);
+    if (!value) {
+      return;
+    }
+    value.forEach((v) => {
+      if (v && v !== '-') {
+        options.add(v);
+      }
+    });
+  });
+  return Array.from(options);
+}
+
+/**
+ * Filters the rows of a table based on the selected namespaces.
+ * @param row - The row to filter.
+ * @param _columnId - The ID of the column being filtered.
+ * @param filterValue - The selected namespaces to filter by.
+ * @returns True if the row should be shown, false otherwise.
+ */
+export function filterFn(
+  row: Row<ClusterRoleBinding | RoleBinding>,
+  _columnId: string,
+  filterValue: string[]
+) {
+  // when no filter is set, show all rows
+  if (filterValue.length === 0) {
+    return true;
+  }
+  const subjectNamespaces = row.original.subjects?.flatMap(
+    (sub) => sub.namespace ?? []
+  );
+  return filterValue.some((v) => subjectNamespaces?.includes(v));
+}