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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.
#include "components/regional_capabilities/regional_capabilities_utils.h"
#include <algorithm>
#include <optional>
#include <random>
#include <string>
#include <variant>
#include "base/command_line.h"
#include "base/containers/to_vector.h"
#include "components/country_codes/country_codes.h"
#include "components/regional_capabilities/eea_countries_ids.h"
#include "components/regional_capabilities/regional_capabilities_prefs.h"
#include "components/regional_capabilities/regional_capabilities_switches.h"
#include "third_party/search_engines_data/resources/definitions/prepopulated_engines.h"
#include "third_party/search_engines_data/resources/definitions/regional_settings.h"
namespace regional_capabilities {
namespace {
using country_codes::CountryId;
using TemplateURLPrepopulateData::PrepopulatedEngine;
using TemplateURLPrepopulateData::RegionalSettings;
// The number of search engines for each country falling into the "top"
// category.
constexpr size_t kTopSearchEnginesThreshold = 5;
// Returns regional settings appropriate for the provided country. If no
// specific regional settings are defined, returns the default settings.
const RegionalSettings& GetRegionalSettings(CountryId country_id) {
auto iter = TemplateURLPrepopulateData::kRegionalSettings.find(country_id);
if (iter == TemplateURLPrepopulateData::kRegionalSettings.end()) {
// Fallback to default country.
iter = TemplateURLPrepopulateData::kRegionalSettings.find(CountryId());
}
return *iter->second;
}
void ShufflePrepopulatedEngines(std::vector<const PrepopulatedEngine*>& engines,
PrefService& prefs) {
std::default_random_engine generator;
generator.seed(prefs::GetShuffleSeed(prefs));
std::shuffle(engines.begin(), engines.end(), generator);
}
} // namespace
bool IsEeaCountry(country_codes::CountryId country_id) {
// The `HasSearchEngineCountryListOverride()` check is here for compatibility
// with the way EEA presence was checked from `search_engines`. But it should
// logically be done only when the EEA presence is checked specifically for
// the current profile country.
// TODO(crbug.com/328040066): Move this check to
// `RegionalCapabilitiesService::IsInEeaCountry()`.
return HasSearchEngineCountryListOverride()
? true
: kEeaChoiceCountriesIds.contains(country_id);
}
std::optional<SearchEngineCountryOverride> GetSearchEngineCountryOverride() {
base::CommandLine* command_line = base::CommandLine::ForCurrentProcess();
if (!command_line->HasSwitch(switches::kSearchEngineChoiceCountry)) {
return std::nullopt;
}
std::string country_id =
base::CommandLine::ForCurrentProcess()->GetSwitchValueASCII(
switches::kSearchEngineChoiceCountry);
if (country_id == switches::kDefaultListCountryOverride) {
return SearchEngineCountryListOverride::kEeaDefault;
}
if (country_id == switches::kEeaListCountryOverride) {
return SearchEngineCountryListOverride::kEeaAll;
}
return country_codes::CountryId(country_id);
}
bool HasSearchEngineCountryListOverride() {
std::optional<SearchEngineCountryOverride> country_override =
GetSearchEngineCountryOverride();
if (!country_override.has_value()) {
return false;
}
return std::holds_alternative<SearchEngineCountryListOverride>(
country_override.value());
}
std::vector<const PrepopulatedEngine*> GetPrepopulatedEngines(
CountryId country_id,
PrefService& prefs) {
const RegionalSettings& regional_settings = GetRegionalSettings(country_id);
std::vector<const PrepopulatedEngine*> engines;
if (regional_capabilities::IsEeaCountry(country_id)) {
engines = base::ToVector(regional_settings.search_engines);
ShufflePrepopulatedEngines(engines, prefs);
} else {
size_t num_top_engines = std::min(regional_settings.search_engines.size(),
kTopSearchEnginesThreshold);
engines = base::ToVector(
base::span(regional_settings.search_engines).first(num_top_engines));
}
return engines;
}
std::vector<const PrepopulatedEngine*> GetAllEeaRegionPrepopulatedEngines() {
std::vector<const PrepopulatedEngine*> result;
// We use a `flat_set` to filter out engines that have the same prepopulated
// id. For example, `yahoo_fr` and `yahoo_de` have the same prepopulated id
// because they point to the same search engine so we only want to record one
// instance.
base::flat_set<int> used_engines;
for (CountryId eea_country_id :
regional_capabilities::kEeaChoiceCountriesIds) {
const auto& search_engines =
GetRegionalSettings(eea_country_id).search_engines;
for (const auto* search_engine : search_engines) {
if (auto [_, added] = used_engines.emplace(search_engine->id); added) {
result.push_back(search_engine);
}
}
}
return result;
}
std::vector<const PrepopulatedEngine*> GetDefaultPrepopulatedEngines() {
return base::ToVector(GetRegionalSettings(CountryId()).search_engines);
}
} // namespace regional_capabilities
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