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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 CHROME_BROWSER_ASH_INPUT_METHOD_GRAMMAR_SERVICE_CLIENT_H_
#define CHROME_BROWSER_ASH_INPUT_METHOD_GRAMMAR_SERVICE_CLIENT_H_
#include <string>
#include <vector>
#include "base/functional/callback.h"
#include "chrome/browser/profiles/profile.h"
#include "chromeos/services/machine_learning/public/mojom/grammar_checker.mojom.h"
#include "chromeos/services/machine_learning/public/mojom/machine_learning_service.mojom-shared.h"
#include "chromeos/services/machine_learning/public/mojom/text_classifier.mojom.h"
#include "mojo/public/cpp/bindings/remote.h"
#include "ui/base/ime/grammar_fragment.h"
namespace ash {
namespace input_method {
// A class that sends grammar check request to ML service, parses the reponse
// and calls a provided callback method. A simple usage is creating a
// GrammarServiceClient and call its RequestTextCheck method as listed in the
// following snippet.
//
// class MyClient {
// public:
// MyClient();
// virtual ~MyClient();
//
// void OnTextCheckComplete(
// int tag,
// bool success,
// const std::vector<SpellCheckResult>& results) {
// ...
// }
//
// void MyTextCheck(Profile* profile, const std::u16string& text) {
// client_.reset(new GrammarServiceClient);
// client_->RequestTextCheck(profile, 0, text,
// base::BindOnce(&MyClient::OnTextCheckComplete,
// base::Unretained(this));
// }
// private:
// std::unique_ptr<GrammarServiceClient> client_;
// };
//
class GrammarServiceClient {
public:
GrammarServiceClient();
virtual ~GrammarServiceClient();
using TextCheckCompleteCallback = base::OnceCallback<void(
bool /* success */,
const std::vector<ui::GrammarFragment>& /* results */)>;
// Sends grammar check request to ML service, parses the reponse
// and calls a provided callback method.
virtual bool RequestTextCheck(Profile* profile,
const std::u16string& text,
TextCheckCompleteCallback callback);
private:
void OnLoadGrammarCheckerDone(
chromeos::machine_learning::mojom::GrammarCheckerQueryPtr query,
const std::string& query_text,
TextCheckCompleteCallback callback,
chromeos::machine_learning::mojom::LoadModelResult result);
void OnLoadTextClassifierDone(
const std::string& query_text,
TextCheckCompleteCallback callback,
chromeos::machine_learning::mojom::LoadModelResult result);
void OnLanguageDetectionDone(
const std::string& query_text,
TextCheckCompleteCallback callback,
std::vector<chromeos::machine_learning::mojom::TextLanguagePtr>
languages);
// Parse the result returned from grammar check service.
void ParseGrammarCheckerResult(
const std::string& query_text,
TextCheckCompleteCallback callback,
chromeos::machine_learning::mojom::GrammarCheckerResultPtr result) const;
// Returns whether the grammar service is enabled by user settings and the
// service is ready to use.
bool IsAvailable(Profile* profile) const;
base::WeakPtr<GrammarServiceClient> weak_this_;
mojo::Remote<chromeos::machine_learning::mojom::GrammarChecker>
grammar_checker_;
bool grammar_checker_loaded_ = false;
mojo::Remote<chromeos::machine_learning::mojom::TextClassifier>
text_classifier_;
bool text_classifier_loaded_ = false;
base::WeakPtrFactory<GrammarServiceClient> weak_factory_{this};
};
} // namespace input_method
} // namespace ash
#endif // CHROME_BROWSER_ASH_INPUT_METHOD_GRAMMAR_SERVICE_CLIENT_H_
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