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// Copyright 2020 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CHROMEOS_COMPONENTS_QUICK_ANSWERS_UTILS_LANGUAGE_DETECTOR_H_
#define CHROMEOS_COMPONENTS_QUICK_ANSWERS_UTILS_LANGUAGE_DETECTOR_H_
#include <memory>
#include <optional>
#include <string>
#include "base/functional/callback_forward.h"
#include "base/memory/raw_ptr.h"
#include "base/memory/weak_ptr.h"
#include "chromeos/services/machine_learning/public/mojom/text_classifier.mojom.h"
namespace quick_answers {
// Utility class for language detection.
class LanguageDetector {
public:
using DetectLanguageCallback =
base::OnceCallback<void(std::optional<std::string>)>;
explicit LanguageDetector(
chromeos::machine_learning::mojom::TextClassifier* text_classifier);
LanguageDetector(const LanguageDetector&) = delete;
LanguageDetector& operator=(const LanguageDetector&) = delete;
~LanguageDetector();
// Returns language code of the specified |selected_text|.
// Fall back to language code of |surrounding_text| if the confidence level is
// not high enough.
// Returns no value if no language can be detected.
void DetectLanguage(const std::string& surrounding_text,
const std::string& selected_text,
DetectLanguageCallback callback);
private:
void FindLanguagesForSelectedTextCallback(
const std::string& surrounding_text,
DetectLanguageCallback callback,
std::vector<chromeos::machine_learning::mojom::TextLanguagePtr>
languages);
void FindLanguagesForSurroundingTextCallback(
DetectLanguageCallback callback,
std::vector<chromeos::machine_learning::mojom::TextLanguagePtr>
languages);
// Owned by IntentGenerator.
raw_ptr<chromeos::machine_learning::mojom::TextClassifier> text_classifier_ =
nullptr;
base::WeakPtrFactory<LanguageDetector> weak_factory_{this};
};
} // namespace quick_answers
#endif // CHROMEOS_COMPONENTS_QUICK_ANSWERS_UTILS_LANGUAGE_DETECTOR_H_
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