import java.io.File;

import java.io.FileInputStream;

import java.io.InputStream;

import java.util.*;

public class I18nUtils {

    private static final Map<String, Map<String, String>> i18nData = new HashMap<>();

    public static Map<String, String> getI18nByLangCode(String langCode) {

        langCode = langCode.toLowerCase();

        String fileName = "string_" + langCode + ".properties";

        return i18nData.get(fileName);

    }

    public static Map<String, String> getI18nMap(String langCode) {

        Map<String, String> m = getI18nByLangCode(langCode);

        if (m == null) {

            m = getI18nByLangCode("en");

        }

        return m;

    }

    public static void loadI18nResouce() throws Exception {

        String path = I18nUtils.class.getResource("/").getPath();

        File f = new File(path + "/i18n");

        if (f.exists() && f.isDirectory()) {

            File[] files = f.listFiles();

            if (files != null && files.length > 0) {

                for (File file : files) {

                    String fileName = file.getName();

                    if (fileName.startsWith("string_") && fileName.endsWith(".properties")) {

                        InputStream in = new FileInputStream(file);

                        Properties properties = new Properties();

                        properties.load(in);

                        Map<String, String> map = toMap(properties);

                        i18nData.put(fileName, map);

                        in.close();

                        properties.clear();

                    }

                }

            }

        }

    }

    private static Map<String, String> toMap(Properties properties) {

        Map<String, String> map = new HashMap<>();

        Enumeration<?> names = properties.propertyNames();

        while (names.hasMoreElements()) {

            Object name = names.nextElement();

            if (name != null) {

                String name1 = name.toString();

                String value = properties.getProperty(name1);

                map.put(name1, value);

            }

        }

        return map;

    }

}