<?php

namespace
{
	use Vn\Lib\Locale;

	function i($stringId)
	{
		echo Locale::getString ($stringId);
	}
	
	function s($stringId)
	{
		return Locale::getString ($stringId);
	}
}

namespace Vn\Lib
{
	class Locale
	{
		static $localeSet = FALSE;
		static $locale = 'en';
		static $strings = [];
		static $paths = [];
		
		/**
		 * Sets the locale.
		 *
		 * @param string $locale The locale with 2 digits format, or %NULL to
		 * set the default
		 **/
		static function set ($locale = NULL)
		{
			if (empty ($locale))
				$locale = self::$locale;
		
			self::$locale = $locale;
			setlocale (LC_ALL, $locale);
			self::$localeSet = TRUE;

			foreach (self::$paths as $path => $kk)
				self::loadFile ($path);
		}
		
		/**
		 * Gets the locale.
		 *
		 * @return string The locale with 2 digits format
		 **/
		static function get ()
		{
			return self::$locale;
		}

		/**
		 * Gets the translation of a string, if no translation is found the same
		 * string is returned.
		 *
		 * @param string $stringId The string to translate
		 * @return string The translated string
		 **/
		static function getString ($stringId)
		{
			if (isset (self::$strings[$stringId]))
				return self::$strings[$stringId];
			else
				return $stringId;
		}

		/**
		 * Adds a path where a JSON file with translations is located.
		 *
		 * @param string $path The JSON file path
		 **/
		static function addPath ($path)
		{
			self::$paths[$path] = TRUE;
	
			if (self::$localeSet)
				self::loadFile ($path);
		}
		
		/**
		 * Loads translations from a JSON file.
		 *
		 * @param string $path The JSON file path
		 **/
		static function loadFile ($path)
		{
			$locale = self::$locale;
			$file = stream_resolve_include_path ("$path/locale/$locale.json");

			if (file_exists ($file)
			&& ($jsonString = file_get_contents ($file)))
				self::addTranslations (json_decode ($jsonString, TRUE));
		}
		
		/**
		 * Adds a set of translations to the database.
		 *
		 * @param array $strings Associative array of every string and its
		 * translation
		 **/
		static function addTranslations ($strings)
		{
			foreach ($strings as $string => &$translation)
				self::$strings[$string] = &$translation;
		}
	}
}