OpenHealth/app/src/main/java/com/dzeio/openhealth/utils/LocaleUtils.kt

package com.dzeio.openhealth.utils

import android.app.LocaleManager
import android.content.Context
import android.content.res.Configuration
import android.os.Build
import android.os.LocaleList
import androidx.preference.PreferenceManager
import com.dzeio.openhealth.Settings
import java.util.Locale


/**
 * Utils object for [Locale]
 *
 * @see https://github.com/gunhansancar/ChangeLanguageExample/blob/master/app/src/main/java/com/gunhansancar/changelanguageexample/helper/LocaleHelper.java
 */
object LocaleUtils {
    fun onAttach(context: Context): Context {
        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.TIRAMISU) {
            val lang = getPersistedData(context)
            return setLanguage(context, lang)
        }
        return context
    }

    fun getLanguage(context: Context): String {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.TIRAMISU) {
            return context.getSystemService(LocaleManager::class.java)
                .applicationLocales.get(0).language
        }
        return getPersistedData(context)
    }

    fun setLanguage(context: Context, language: String): Context {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.TIRAMISU) {
            context.getSystemService(LocaleManager::class.java)
                .applicationLocales =
                LocaleList.forLanguageTags(language)
        }
        persist(context, language)
        return updateResources(context, language)
    }

    private fun getPersistedData(context: Context): String {
        // TODO: use the config class
        val preferences = PreferenceManager.getDefaultSharedPreferences(context)
        return preferences.getString(Settings.APP_LANGUAGE, Locale.getDefault().language)
            ?: Locale.getDefault().language
    }

    private fun persist(context: Context, language: String?) {
        // TODO: use the config class
        val preferences = PreferenceManager.getDefaultSharedPreferences(context)
        preferences.edit().putString(Settings.APP_LANGUAGE, language).apply()
    }

    private fun updateResources(context: Context, language: String): Context {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
            val locale = Locale(language)
            Locale.setDefault(locale)
            val configuration = context.resources.configuration
            configuration.setLocale(locale)
            configuration.setLayoutDirection(locale)
            return context.createConfigurationContext(configuration)
        }
        val locale = Locale(language)
        Locale.setDefault(locale)
        val resources = context.resources
        val configuration: Configuration = resources.configuration
        configuration.locale = locale
        configuration.setLayoutDirection(locale)
        resources.updateConfiguration(configuration, resources.displayMetrics)
        return context
    }
}