#include "locale.hpp"
#include <cstring>
#include <clocale>
#include <algorithm>

#undef min
#undef max

extern "C" const uint8_t L_en_US[];
extern "C" size_t L_en_US_SZ;

extern "C" const uint8_t L_en_GB[];
extern "C" size_t L_en_GB_SZ;

extern "C" const uint8_t L_ja_JP[];
extern "C" size_t L_ja_JP_SZ;

namespace urde
{

using namespace std::literals;

static const specter::Locale Locales[] =
{
    {"en_US"sv, "US English"sv, L_en_US, L_en_US_SZ},
    {"en_GB"sv, "British English"sv, L_en_GB, L_en_GB_SZ},
    {"ja_JP"sv, "Japanese"sv, L_ja_JP, L_ja_JP_SZ}
};

std::vector<std::pair<std::string_view, std::string_view>> ListLocales()
{
    constexpr size_t localeCount = std::extent<decltype(Locales)>::value;
    std::vector<std::pair<std::string_view, std::string_view>> ret;
    ret.reserve(localeCount);
    for (size_t i=0 ; i<localeCount ; ++i)
    {
        const specter::Locale& l = Locales[i];
        ret.emplace_back(l.name(), l.fullName());
    }
    return ret;
}

const specter::Locale* LookupLocale(std::string_view name)
{
    constexpr size_t localeCount = std::extent<decltype(Locales)>::value;
    for (size_t i=0 ; i<localeCount ; ++i)
    {
        const specter::Locale& l = Locales[i];
        if (!name.compare(l.name()))
            return &l;
    }
    return nullptr;
}

const specter::Locale* SystemLocaleOrEnglish()
{
    const char* sysLocale = std::setlocale(LC_ALL, nullptr);
    size_t sysLocaleLen = std::strlen(sysLocale);
    constexpr size_t localeCount = std::extent<decltype(Locales)>::value;
    for (size_t i=0 ; i<localeCount ; ++i)
    {
        const specter::Locale& l = Locales[i];
        if (!l.name().compare(0, std::min(l.name().size(), sysLocaleLen), sysLocale))
            return &l;
    }
    return Locales;
}

}