first commit

frontend/src/hooks/useScores.ts

@@ -0,0 +1,26 @@
+import { useMutation, useQuery, useQueryClient } from '@tanstack/react-query';
+import * as scoresApi from '../api/scores';
+import { useToast } from '../components/ui/Toast';
+
+export function useRankings() {
+  return useQuery({
+    queryKey: ['rankings'],
+    queryFn: () => scoresApi.getRankings(),
+  });
+}
+
+export function useUpdateWeights() {
+  const qc = useQueryClient();
+  const { addToast } = useToast();
+
+  return useMutation({
+    mutationFn: (weights: Record<string, number>) => scoresApi.updateWeights(weights),
+    onSuccess: () => {
+      qc.invalidateQueries({ queryKey: ['rankings'] });
+      addToast('success', 'Weights updated successfully');
+    },
+    onError: (error: Error) => {
+      addToast('error', error.message || 'Failed to update weights');
+    },
+  });
+}