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// Copyright 2025 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CHROME_BROWSER_ACTOR_TOOLS_HISTORY_TOOL_H_
#define CHROME_BROWSER_ACTOR_TOOLS_HISTORY_TOOL_H_
#include <memory>
#include <optional>
#include <vector>
#include "base/memory/weak_ptr.h"
#include "chrome/browser/actor/tools/history_tool_request.h"
#include "chrome/browser/actor/tools/tool.h"
#include "chrome/browser/actor/tools/tool_request.h"
#include "chrome/common/actor.mojom-forward.h"
#include "components/tabs/public/tab_interface.h"
#include "content/public/browser/navigation_controller.h"
#include "content/public/browser/web_contents_observer.h"
#include "third_party/abseil-cpp/absl/container/flat_hash_set.h"
namespace content {
class NavigationHandle;
class WebContents;
} // namespace content
namespace actor {
// Performs a history navigation in a WebContents.
class HistoryTool : public Tool, content::WebContentsObserver {
public:
HistoryTool(TaskId task_id,
AggregatedJournal& journal,
content::WebContents& web_contents,
HistoryToolRequest::Direction direction);
~HistoryTool() override;
// actor::Tool
void Validate(ValidateCallback callback) override;
void Invoke(InvokeCallback callback) override;
std::string DebugString() const override;
std::string JournalEvent() const override;
std::unique_ptr<ObservationDelayController> GetObservationDelayer()
const override;
// content::WebContentsObserver
void DidStartNavigation(
content::NavigationHandle* navigation_handle) override;
void DidFinishNavigation(
content::NavigationHandle* navigation_handle) override;
private:
void FinishToolInvocationIfNeeded(mojom::ActionResultPtr result);
void PurgePendingNavigations();
bool IsInvokeInProgress() const;
// Whether the navigation is backwards or forwards in session history.
HistoryToolRequest::Direction direction_;
// This class tracks all navigation handles created as a result of the history
// traversal in `pending_navigations_`. However, these navigations may or may
// not start. When they are started (or canceled), they are removed from this
// vector. Started navigations that are added to `in_flight_navigation_ids_`.
// Note: these are vector/set since a history traversal can navigate multiple
// frames.
content::NavigationController::WeakNavigationHandleVector
pending_navigations_;
absl::flat_hash_set<uint64_t> in_flight_navigation_ids_;
// Holds the callback to the Invoke method. Null before invoke is called.
InvokeCallback invoke_callback_;
base::WeakPtrFactory<HistoryTool> weak_ptr_factory_{this};
};
} // namespace actor
#endif // CHROME_BROWSER_ACTOR_TOOLS_HISTORY_TOOL_H_
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