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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_ON_DEVICE_TRANSLATION_TRANSLATION_MANAGER_UTIL_H_
#define CHROME_BROWSER_ON_DEVICE_TRANSLATION_TRANSLATION_MANAGER_UTIL_H_
#include <optional>
#include <string_view>
#include <vector>
#include "chrome/browser/on_device_translation/language_pack_util.h"
#include "components/prefs/pref_service.h"
#include "content/public/browser/browser_context.h"
#include "third_party/blink/public/mojom/on_device_translation/translation_manager.mojom.h"
namespace on_device_translation {
// Returns the Accept Languages for a given Profile.
const std::vector<std::string_view> GetAcceptLanguages(
content::BrowserContext* browser_context);
// Determines if a given language is in the Accept languages.
bool IsInAcceptLanguage(const std::vector<std::string_view>& accept_languages,
const std::string_view lang);
// Determines if the Translator API is enabled.
bool IsTranslatorAllowed(content::BrowserContext* browser_context);
// Implementation of LookupMatchingLocaleByBestFit
// (https://tc39.es/ecma402/#sec-lookupmatchinglocalebybestfit) as
// LookupMatchingLocaleByPrefix
// (https://tc39.es/ecma402/#sec-lookupmatchinglocalebyprefix) assuming
// `available_languages` contains no extension.
template <typename SetType>
std::optional<std::string> LookupMatchingLocaleByBestFit(
const SetType& available_languages,
std::string requested_language) {
std::string prefix = std::move(requested_language);
while (prefix != "") {
if (available_languages.contains(prefix)) {
return prefix;
}
int pos = prefix.rfind('-');
if (pos == -1) {
break;
}
prefix.resize(pos);
}
return std::nullopt;
}
} // namespace on_device_translation
#endif // CHROME_BROWSER_ON_DEVICE_TRANSLATION_TRANSLATION_MANAGER_UTIL_H_
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