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// Copyright 2019 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_OMNIBOX_BROWSER_LOCAL_HISTORY_ZERO_SUGGEST_PROVIDER_H_
#define COMPONENTS_OMNIBOX_BROWSER_LOCAL_HISTORY_ZERO_SUGGEST_PROVIDER_H_
#include <string>
#include "base/gtest_prod_util.h"
#include "base/memory/raw_ptr.h"
#include "base/memory/weak_ptr.h"
#include "base/task/cancelable_task_tracker.h"
#include "components/omnibox/browser/autocomplete_provider.h"
class AutocompleteProviderClient;
class AutocompleteProviderListener;
namespace history {
class QueryResults;
} // namespace history
// Autocomplete provider for on-focus zero-prefix query suggestions from local
// history when Google is the default search engine.
class LocalHistoryZeroSuggestProvider : public AutocompleteProvider {
public:
// Creates and returns an instance of this provider.
static LocalHistoryZeroSuggestProvider* Create(
AutocompleteProviderClient* client,
AutocompleteProviderListener* listener);
// AutocompleteProvider:
void Start(const AutocompleteInput& input, bool minimal_changes) override;
void DeleteMatch(const AutocompleteMatch& match) override;
private:
FRIEND_TEST_ALL_PREFIXES(LocalHistoryZeroSuggestProviderTest, Input);
LocalHistoryZeroSuggestProvider(AutocompleteProviderClient* client,
AutocompleteProviderListener* listener);
~LocalHistoryZeroSuggestProvider() override;
LocalHistoryZeroSuggestProvider(const LocalHistoryZeroSuggestProvider&) =
delete;
LocalHistoryZeroSuggestProvider& operator=(
const LocalHistoryZeroSuggestProvider&) = delete;
// Queries the keyword search terms table of the in-memory URLDatabase for the
// recent search terms submitted to the default search provider.
void QueryURLDatabase(const AutocompleteInput& input);
// Called when the query results from HistoryService::QueryHistory are ready.
// Deletes URLs in |results| that would generate |suggestion|. |query_time| is
// the time HistoryService was queried.
void OnHistoryQueryResults(const std::u16string& suggestion,
const base::TimeTicks& query_time,
history::QueryResults results);
// The maximum number of matches to return.
const size_t max_matches_;
// Client for accessing TemplateUrlService, prefs, etc.
const raw_ptr<AutocompleteProviderClient> client_;
// Used for the async tasks querying the HistoryService.
base::CancelableTaskTracker history_task_tracker_;
base::WeakPtrFactory<LocalHistoryZeroSuggestProvider> weak_ptr_factory_{this};
};
#endif // COMPONENTS_OMNIBOX_BROWSER_LOCAL_HISTORY_ZERO_SUGGEST_PROVIDER_H_
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