<?php

/*
	myTinyTodo language class
*/

class Lang
{
	protected static $instance;
	protected static $langDir = MTTLANG;
	protected $code = 'en';
	protected $default = 'en';
	protected $strings;

	public static function instance()
	{
        if (!isset(self::$instance)) {
			$c = __CLASS__;
			self::$instance = new $c;
        }
		return self::$instance;
	}

	public static function loadLangOrDie($code, $die = 1)
	{
		$lang = self::instance();

		//check if json file exists
		if ( self::langExists($code) ) {
			$jsonString = file_get_contents( self::$langDir. "{$code}.json" );
			$lang->loadJsonString($code, $jsonString);
		}
		else if ( $die == 0 ) {
			//notice?
			$lang->code = $lang->default; //sure?
			$lang->loadDefaultStrings();
		}
		else if ( $die == 1 ) {
			die("Language file not found ($code.json)");
		}
	}

	public static function loadLang($code)
	{
		self::loadLangOrDie($code, 0);
	}

	public static function langExists($code)
	{
		return file_exists(self::$langDir. $code. '.json');
	}

	function loadJsonString($code, $jsonString)
	{
		$this->code = $code;
		$json = json_decode($jsonString, true);

		//load default language
		if ( $code != $this->default ) {
			$this->loadDefaultStrings();
			$this->strings = array_replace($this->strings, $json);
		}
		else {
			$this->strings = $json;
		}
	}

	function loadDefaultStrings()
	{
		if ( ! self::langExists($this->default) ) {
			die("Default language file not found ({$this->default}.json)");
		}
		$defStr = file_get_contents($this->langDir(). "{$this->default}.json");
		$this->strings = json_decode($defStr, true);
	}

	function get($key)
	{
		if ( isset($this->strings[$key]) ) {
			return $this->strings[$key];
		}
		return $key;
	}

	function rtl()
	{
		if ( isset($this->strings['_rtl']) ) {
			return intval($this->strings['_rtl']);
		}
		return 0;
	}

	/* minimal number of translated strings to use in js front-end */
	function jsStrings()
	{
		$a = array();
		$a['daysMin'] = $this->get('days_min');
		$a['daysLong'] = $this->get('days_long');
		$a['monthsShort'] = $this->get('months_short');
		$a['monthsLong'] = $this->get('months_long');

		$this->fillWithValues($a, [
			'confirmDelete',
			'confirmLeave',
			'actionNoteSave',
			'actionNoteCancel',
			'error',
			'denied',
			'invalidpass',
			'addList',
			'addListDefault',
			'renameList',
			'deleteList',
			'clearCompleted',
			'settingsSaved',
			'tags',
			'tasks',
			'f_past',
			'f_today',
			'f_soon',
			'alltasks',
			'set_header'
		]);
		$a['_rtl'] = $this->rtl() ? 1 : 0;

		return $a;
	}

	function makeJS($pretty = 0)
	{
		$a = $this->jsStrings();
		$opts = JSON_UNESCAPED_UNICODE;
		if ($pretty) {
			$opts |= JSON_PRETTY_PRINT | JSON_UNESCAPED_SLASHES;
		}
		return json_encode($a, $opts);
	}

	protected function fillWithValues(array &$a, array $keys)
	{
		foreach ( $keys as $key ) {
			$a[$key] = $this->get($key);
		}
	}

	function langDir()
	{
		return self::$langDir;
	}

	function langCode()
	{
		return $this->code;
	}

}

?>