feat: introduce useRewindLogic hook for conversation history navigation (#15716)

packages/cli/src/ui/hooks/useRewind.ts

@@ -0,0 +1,54 @@
+/**
+ * @license
+ * Copyright 2025 Google LLC
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+import { useState, useCallback } from 'react';
+import type {
+  ConversationRecord,
+  MessageRecord,
+} from '@google/gemini-cli-core';
+import {
+  calculateTurnStats,
+  calculateRewindImpact,
+  type FileChangeStats,
+} from '../utils/rewindFileOps.js';
+
+export function useRewind(conversation: ConversationRecord) {
+  const [selectedMessageId, setSelectedMessageId] = useState<string | null>(
+    null,
+  );
+  const [confirmationStats, setConfirmationStats] =
+    useState<FileChangeStats | null>(null);
+
+  const getStats = useCallback(
+    (userMessage: MessageRecord) =>
+      calculateTurnStats(conversation, userMessage),
+    [conversation],
+  );
+
+  const selectMessage = useCallback(
+    (messageId: string) => {
+      const msg = conversation.messages.find((m) => m.id === messageId);
+      if (msg) {
+        setSelectedMessageId(messageId);
+        setConfirmationStats(calculateRewindImpact(conversation, msg));
+      }
+    },
+    [conversation],
+  );
+
+  const clearSelection = useCallback(() => {
+    setSelectedMessageId(null);
+    setConfirmationStats(null);
+  }, []);
+
+  return {
+    selectedMessageId,
+    getStats,
+    confirmationStats,
+    selectMessage,
+    clearSelection,
+  };
+}