using System;
using System.Globalization;
using UnityEngine;

#if UNITY_IOS && !UNITY_EDITOR
using System.Runtime.InteropServices;
#endif

namespace Unity.Services.Analytics.Internal
{
    static class Locale
    {
#if UNITY_IOS && !UNITY_EDITOR
        [DllImport("__Internal")]
        private static extern string unity_services_current_language_code();

        internal static string CurrentLanguageCode()
        {
            return unity_services_current_language_code();
        }

#elif UNITY_ANDROID && !UNITY_EDITOR
        internal static string CurrentLanguageCode()
        {
            AndroidJavaClass localeClass = new AndroidJavaClass("java.util.Locale");
            AndroidJavaObject defaultLocale = localeClass.CallStatic<AndroidJavaObject>("getDefault");
            return defaultLocale.Call<string>("getLanguage");
        }

#else
        internal static string CurrentLanguageCode()
        {
            return CultureInfo.CurrentCulture.TwoLetterISOLanguageName;
        }

#endif
        internal static string AnalyticsRegionLanguageCode()
        {
            // As we can't reliably report current country code (as the only country code we have access to is the region settings,
            // not the user's current country as expected by the Analytics service) then we return ZZ to have the Analytics service
            // infer country from GeoIP instead.
            return $"{CurrentLanguageCode()}_ZZ";
        }
    }
}