/*
 * Geopaparazzi - Digital field mapping on Android based devices
 * Copyright (C) 2016  HydroloGIS (www.hydrologis.com)
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package eu.geopaparazzi.library.locale;

import android.app.Activity;
import android.content.Context;
import android.content.SharedPreferences;

import java.util.Locale;

/**
 * Utilities for locale handling.
 *
 * <p>Taken from: http://snowpard-android.blogspot.it/2013/03/programmatically-change-language-in.html</p>
 *
 * @author Andrea Antonello
 */
public class LocaleUtils {


    /**
     * Changes the locale for the application.
     *
     * @param context
     * @param lang the language code. If "", the command is ignored.
     */
    public static void changeLang(Context context, String lang) {
        if (lang.equalsIgnoreCase(""))
            return;
        Locale myLocale = new Locale(lang);
        saveLocale(context, lang);
        Locale.setDefault(myLocale);
        android.content.res.Configuration config = new android.content.res.Configuration();
        config.locale = myLocale;
        context.getResources().updateConfiguration(config, context.getResources().getDisplayMetrics());
    }

    private static void saveLocale(Context context, String lang) {
        String langPref = "Language";
        SharedPreferences prefs = context.getSharedPreferences("CommonPrefs", Activity.MODE_PRIVATE);
        SharedPreferences.Editor editor = prefs.edit();
        editor.putString(langPref, lang);
        editor.apply();
    }


    /**
     * Get the current locale code from the preferences (set by changeLang).
     *
     * @param context
     * @return the current code or null if none was set in the preferences.
     */
    public static String getCurrentLocale(Context context) {
        String langPref = "Language";
        SharedPreferences prefs = context.getSharedPreferences("CommonPrefs", Activity.MODE_PRIVATE);
        String language = prefs.getString(langPref, "");
        if (language.length() == 0){
            return null;
        }
        return language;
    }

}