NewPipe/app/src/main/java/org/schabi/newpipe/util/Localization.java

package org.schabi.newpipe.util;

import android.content.Context;
import android.content.SharedPreferences;
import android.content.res.Resources;
import android.preference.PreferenceManager;

import org.schabi.newpipe.R;

import java.text.DateFormat;
import java.text.NumberFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Locale;

/**
 * Created by chschtsch on 12/29/15.
 *
 * Copyright (C) Gregory Arkhipov 2015
 * Localization.java is part of NewPipe.
 *
 * NewPipe 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.
 *
 * NewPipe 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 NewPipe.  If not, see <http://www.gnu.org/licenses/>.
 */

public class Localization {

    private Localization() {
    }

    public static Locale getPreferredLocale(Context context) {
        SharedPreferences sp = PreferenceManager.getDefaultSharedPreferences(context);

        String languageCode = sp.getString(String.valueOf(R.string.search_language_key),
                context.getString(R.string.default_language_value));

        if(languageCode.length() == 2) {
            return new Locale(languageCode);
        }
        else if(languageCode.contains("_")) {
            String country = languageCode
                    .substring(languageCode.indexOf("_"), languageCode.length());
            return new Locale(languageCode.substring(0, 2), country);
        }
        return Locale.getDefault();
    }

    public static String localizeViewCount(long viewCount, Context context) {
        Locale locale = getPreferredLocale(context);

        Resources res = context.getResources();
        String viewsString = res.getString(R.string.view_count_text);

        NumberFormat nf = NumberFormat.getInstance(locale);
        String formattedViewCount = nf.format(viewCount);
        return String.format(viewsString, formattedViewCount);
    }

    public static String localizeNumber(long number, Context context) {
        Locale locale = getPreferredLocale(context);
        NumberFormat nf = NumberFormat.getInstance(locale);
        return nf.format(number);
    }

    private static String formatDate(String date, Context context) {
        Locale locale = getPreferredLocale(context);
        SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd");
        Date datum = null;
        try {
            datum = formatter.parse(date);
        } catch (ParseException e) {
            e.printStackTrace();
        }

        DateFormat df = DateFormat.getDateInstance(DateFormat.MEDIUM, locale);

        return df.format(datum);
    }

    public static String localizeDate(String date, Context context) {
        Resources res = context.getResources();
        String dateString = res.getString(R.string.upload_date_text);

        String formattedDate = formatDate(date, context);
        return String.format(dateString, formattedDate);
    }
}