LibreTube/app/src/main/java/com/github/libretube/util/LocaleHelper.kt

package com.github.libretube.util

import android.content.Context
import android.os.Build
import android.telephony.TelephonyManager
import com.github.libretube.preferences.PreferenceHelper
import com.github.libretube.preferences.PreferenceKeys
import java.util.*

object LocaleHelper {

    fun updateLanguage(context: Context) {
        val languageName = PreferenceHelper.getString(PreferenceKeys.LANGUAGE, "sys")
        if (languageName == "sys") updateLocaleConf(context, Locale.getDefault())
        else if ("$languageName".length < 3) {
            val locale = Locale(languageName.toString())
            updateLocaleConf(context, locale)
        } else if ("$languageName".length > 3) {
            val locale = Locale(
                languageName?.substring(0, 2).toString(),
                languageName?.substring(4, 6).toString()
            )
            updateLocaleConf(context, locale)
        }
    }

    private fun updateLocaleConf(context: Context, locale: Locale) {
        // Change API Language
        Locale.setDefault(locale)

        // Change App Language
        val res = context.resources
        val dm = res.displayMetrics
        val conf = res.configuration
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1) {
            conf.setLocale(locale)
        } else {
            conf.locale = locale
        }
        res.updateConfiguration(conf, dm)
    }

    fun getDetectedCountry(context: Context, defaultCountryIsoCode: String): String {
        detectSIMCountry(context)?.let {
            return it
        }

        detectNetworkCountry(context)?.let {
            return it
        }

        detectLocaleCountry(context)?.let {
            return it
        }

        return defaultCountryIsoCode
    }

    private fun detectSIMCountry(context: Context): String? {
        try {
            val telephonyManager =
                context.getSystemService(Context.TELEPHONY_SERVICE) as TelephonyManager
            return telephonyManager.simCountryIso
        } catch (e: Exception) {
            e.printStackTrace()
        }
        return null
    }

    private fun detectNetworkCountry(context: Context): String? {
        try {
            val telephonyManager =
                context.getSystemService(Context.TELEPHONY_SERVICE) as TelephonyManager
            return telephonyManager.networkCountryIso
        } catch (e: Exception) {
            e.printStackTrace()
        }
        return null
    }

    private fun detectLocaleCountry(context: Context): String? {
        try {
            return context.resources.configuration.locales[0].country
        } catch (e: Exception) {
            e.printStackTrace()
        }
        return null
    }
}