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// Copyright 2018 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef COMPONENTS_NTP_TILES_CUSTOM_LINKS_MANAGER_IMPL_H_
#define COMPONENTS_NTP_TILES_CUSTOM_LINKS_MANAGER_IMPL_H_
#include <optional>
#include <utility>
#include <vector>
#include "base/memory/raw_ptr.h"
#include "base/memory/weak_ptr.h"
#include "base/scoped_observation.h"
#include "components/history/core/browser/history_service.h"
#include "components/history/core/browser/history_service_observer.h"
#include "components/ntp_tiles/custom_links_manager.h"
#include "components/ntp_tiles/custom_links_store.h"
#include "components/ntp_tiles/most_visited_sites.h"
#include "components/ntp_tiles/ntp_tile.h"
#include "components/prefs/pref_change_registrar.h"
class PrefService;
namespace user_prefs {
class PrefRegistrySyncable;
} // namespace user_prefs
namespace ntp_tiles {
// Non-test implementation of the CustomLinksManager interface.
class CustomLinksManagerImpl : public CustomLinksManager,
public history::HistoryServiceObserver {
public:
// Restores the previous state of |current_links_| from prefs.
CustomLinksManagerImpl(PrefService* prefs,
// Can be nullptr in unittests.
history::HistoryService* history_service);
CustomLinksManagerImpl(const CustomLinksManagerImpl&) = delete;
CustomLinksManagerImpl& operator=(const CustomLinksManagerImpl&) = delete;
~CustomLinksManagerImpl() override;
// CustomLinksManager implementation.
bool Initialize(const NTPTilesVector& tiles) override;
void Uninitialize() override;
bool IsInitialized() const override;
const std::vector<Link>& GetLinks() const override;
bool AddLinkTo(const GURL& url,
const std::u16string& title,
size_t pos) override;
bool AddLink(const GURL& url, const std::u16string& title) override;
bool UpdateLink(const GURL& url,
const GURL& new_url,
const std::u16string& new_title) override;
bool ReorderLink(const GURL& url, size_t new_pos) override;
bool DeleteLink(const GURL& url) override;
bool UndoAction() override;
base::CallbackListSubscription RegisterCallbackForOnChanged(
base::RepeatingClosure callback) override;
// Register preferences used by this class.
static void RegisterProfilePrefs(
user_prefs::PrefRegistrySyncable* user_prefs);
private:
void ClearLinks();
// Stores the current list to the profile's preferences. Does not notify
// |OnPreferenceChanged|.
void StoreLinks();
// Checks during instantiation to remove custom shortcut links
// created through preinstalled apps.
void RemoveCustomLinksForPreinstalledApps();
// Returns an iterator into |custom_links_|.
std::vector<Link>::iterator FindLinkWithUrl(const GURL& url);
// history::HistoryServiceObserver implementation.
// Deletes any Most Visited links whose URL is in |deletion_info|. Clears
// |previous_links_|. Does not delete entries expired by HistoryService.
void OnHistoryDeletions(history::HistoryService* history_service,
const history::DeletionInfo& deletion_info) override;
void HistoryServiceBeingDeleted(
history::HistoryService* history_service) override;
// Called when the current list of links and/or initialization state in
// PrefService is modified. Saves the new set of links in |current_links_|
// and notifies |closure_list_|.
void OnPreferenceChanged();
const raw_ptr<PrefService> prefs_;
CustomLinksStore store_;
std::vector<Link> current_links_;
// The state of the current list of links before the last action was
// performed.
std::optional<std::vector<Link>> previous_links_;
// List of closures to be invoked when custom links are updated by outside
// sources.
base::RepeatingClosureList closure_list_;
// Observer for the HistoryService.
base::ScopedObservation<history::HistoryService,
history::HistoryServiceObserver>
history_service_observation_{this};
// Observer for Chrome sync changes to |prefs::kCustomLinksList| and
// |prefs::kCustomLinksInitialized|.
PrefChangeRegistrar pref_change_registrar_;
// Used to ignore notifications from |pref_change_registrar_| that we trigger
// ourselves when updating the preferences.
bool updating_preferences_ = false;
base::WeakPtrFactory<CustomLinksManagerImpl> weak_ptr_factory_{this};
};
} // namespace ntp_tiles
#endif // COMPONENTS_NTP_TILES_CUSTOM_LINKS_MANAGER_IMPL_H_
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