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<?php
if ( ! defined( 'ABSPATH' ) ) {
	exit;
}

if ( WP_DEBUG ) {
	require_once( QTRANSLATE_DIR . '/inc/qtx_dbg.php' );
} else {
	if ( ! function_exists( 'qtranxf_dbg_log' ) ) {
		function qtranxf_dbg_log( $msg, $var = null, $bt = false, $exit = false ) {
		}

		function qtranxf_dbg_echo( $msg, $var = null, $bt = false, $exit = false ) {
		}

		function qtranxf_dbg_log_if( $condition, $msg, $var = null, $bt = false, $exit = false ) {
		}

		function qtranxf_dbg_echo_if( $condition, $msg, $var = null, $bt = false, $exit = false ) {
		}
	}
	//assert_options(ASSERT_ACTIVE,false);
	//assert_options(ASSERT_WARNING,false);
	//assert_options(ASSERT_QUIET_EVAL,true);
}

/**
 * @since 3.3.1
 */
function qtranxf_error_log( $msg ) {
	qtranxf_add_error( $msg );
	error_log( 'qTranslate-X: ' . strip_tags( $msg ) );
}

/**
 * @since 3.3.7
 */
function qtranxf_add_error( $msg ) {
	qtranxf_add_admin_notice( $msg, 'errors' );
}

function qtranxf_add_warning( $msg ) {
	qtranxf_add_admin_notice( $msg, 'warnings' );
}

function qtranxf_add_message( $msg ) {
	qtranxf_add_admin_notice( $msg, 'messages' );
}

/**
 * @since 3.3.8.4
 */
function qtranxf_add_admin_notice( $msg, $kind ) {
	global $q_config;
	if ( isset( $q_config['url_info'][ $kind ] ) ) {
		if ( ! in_array( $msg, $q_config['url_info'][ $kind ] ) ) {
			$q_config['url_info'][ $kind ][] = $msg;
		}
	} else {
		if ( ! isset( $q_config['url_info'] ) ) {
			$q_config['url_info'] = array();
		}
		$q_config['url_info'][ $kind ] = array( $msg );
	}
}

/**
 * Default domain translation for strings already translated by WordPress.
 * Use of this function prevents xgettext, poedit and other translating parsers from including the string that does not need translation.
 */
function qtranxf_translate_wp( $s ) {
	return __( $s );
}

/**
 * @since 3.3.8.8
 */
function qtranxf_plugin_basename() {
	static $s;
	if ( ! $s ) {
		$s = plugin_basename( wp_normalize_path( QTRANSLATE_FILE ) );
	}

	return $s;
}

/**
 * @since 3.3.2
 */
function qtranxf_plugin_dirname() {
	static $s;
	if ( ! $s ) {
		$b = qtranxf_plugin_basename();
		$s = dirname( $b );
	}

	return $s;
}

/**
 * Compose path to a plugin folder relative to WP_CONTENT_DIR.
 * Takes into account linked folders in the path.
 * Works for plugin paths only. No trailing slash in the return string.
 * It may return absolute path to plugin folder in case content and plugin directories are on different devices.
 *
 * @param string $plugin is path to plugin file, like the one coming from __FILE__.
 *
 * @return string path to plugin folder relative to WP_CONTENT_DIR.
 * @since 3.4.5
 */
function qtranxf_dir_from_wp_content( $plugin ) {
	global $wp_plugin_paths;
	$plugin_realpath = wp_normalize_path( dirname( realpath( $plugin ) ) );
	$d               = $plugin_realpath;
	foreach ( $wp_plugin_paths as $dir => $realdir ) {
		if ( $plugin_realpath != $realdir ) {
			continue;
		}
		$d = $dir;
		break;
	}
	$c     = trailingslashit( wp_normalize_path( WP_CONTENT_DIR ) );
	$d_len = strlen( $d );
	$c_len = strlen( $c );
	$i     = 0;
	while ( $i < $d_len && $i < $c_len && $d[ $i ] == $c[ $i ] ) {
		++ $i;
	}
	if ( $i == $c_len ) {
		return substr( $d, $c_len );
	}
	if ( $i == 0 ) {
		return $d;
	}//return absolute path then
	$c = substr( $c, $i );
	$d = substr( $d, $i );
	for ( $i = substr_count( $c, '/' ); -- $i >= 0; ) {
		$d = '../' . $d;
	}

	return $d;
}

/**
 * Return path to QTX plugin folder relative to WP_CONTENT_DIR.
 * Uses qtranxf_dir_from_wp_content
 * @since 3.4
 * @since 3.4.5 modified for multisite.
 */
function qtranxf_plugin_dirname_from_wp_content() {
	static $s;
	if ( ! $s ) {
		//qtranxf_dbg_log('__FILE__: ', __FILE__);//links are resolved
		//qtranxf_dbg_log('wp_normalize_path(__FILE__): ', wp_normalize_path(__FILE__));//links are resolved, same as __FILE__
		//qtranxf_dbg_log('plugin_dir_path: ', plugin_dir_path( __FILE__ ));//links are resolved, with trailing slash
		//qtranxf_dbg_log('plugin_basename: ', plugin_basename( __FILE__ ));//no links resolved
		//qtranxf_dbg_log('WP_CONTENT_DIR: ', WP_CONTENT_DIR);//no links resolved
		//qtranxf_dbg_log('wp_content_dir(): ', wp_content_dir());//no links resolved
		//qtranxf_dbg_log('WP_PLUGIN_DIR: ', WP_PLUGIN_DIR);//no links resolved
		//qtranxf_dbg_log('WP_MU_PLUGIN_DIR: ', WPMU_PLUGIN_DIR);//no links resolved
		//qtranxf_dbg_log('plugin_dir_url: ', plugin_dir_url( __FILE__ ));//no links, naturally
		//qtranxf_dbg_log('content_url: ', content_url());//no links either
		$s = qtranxf_dir_from_wp_content( QTRANSLATE_FILE );
	}

	return $s;
}

function qtranxf_parseURL( $url ) {
	//this is not the same as native parse_url and so it is in use
	//it should also work quicker than native parse_url, so we should keep it?
	//preg_match('!(?:(\w+)://)?(?:(\w+)\:(\w+)@)?([^/:]+)?(?:\:(\d*))?([^#?]+)?(?:\?([^#]+))?(?:#(.+$))?!',$url,$out);
	preg_match( '!(?:(\w+)://)?(?:(\w+)\:(\w+)@)?([^/:?#]+)?(?:\:(\d*))?([^#?]+)?(?:\?([^#]+))?(?:#(.+$))?!', $url, $out );
	//qtranxf_dbg_log('qtranxf_parseURL('.$url.'): out:',$out);
	//new code since 3.2.8 - performance improvement
	$result = array();
	if ( ! empty( $out[1] ) ) {
		$result['scheme'] = $out[1];
	}
	if ( ! empty( $out[2] ) ) {
		$result['user'] = $out[2];
	}
	if ( ! empty( $out[3] ) ) {
		$result['pass'] = $out[3];
	}
	if ( ! empty( $out[4] ) ) {
		$result['host'] = $out[4];
	}
	if ( ! empty( $out[6] ) ) {
		$result['path'] = $out[6];
	}
	if ( ! empty( $out[7] ) ) {
		$result['query'] = $out[7];
	}
	if ( ! empty( $out[8] ) ) {
		$result['fragment'] = $out[8];
	}
	if ( ! empty( $out[5] ) ) {
		$result['host'] .= ':' . $out[5];
	}

	return $result;
}

/**
 * @since 3.2.8
 */
function qtranxf_buildURL( $urlinfo, $homeinfo ) {
	//qtranxf_dbg_log('qtranxf_buildURL: $urlinfo:',$urlinfo);
	//qtranxf_dbg_log('qtranxf_buildURL: $homeinfo:',$homeinfo);
	if ( empty( $urlinfo['host'] ) ) {//relative path stays relative
		$url = '';
	} else {
		$url = ( empty( $urlinfo['scheme'] ) ? $homeinfo['scheme'] : $urlinfo['scheme'] ) . '://';
		if ( ! empty( $urlinfo['user'] ) ) {
			$url .= $urlinfo['user'];
			if ( ! empty( $urlinfo['pass'] ) ) {
				$url .= ':' . $urlinfo['pass'];
			}
			$url .= '@';
		} elseif ( ! empty( $homeinfo['user'] ) ) {
			$url .= $homeinfo['user'];
			if ( ! empty( $homeinfo['pass'] ) ) {
				$url .= ':' . $homeinfo['pass'];
			}
			$url .= '@';
		}
		$url .= empty( $urlinfo['host'] ) ? $homeinfo['host'] : $urlinfo['host'];
	}
	if ( ! empty( $urlinfo['path-base'] ) ) {
		$url .= $urlinfo['path-base'];
	}
	if ( ! empty( $urlinfo['wp-path'] ) ) {
		$url .= $urlinfo['wp-path'];
	}
	if ( ! empty( $urlinfo['query'] ) ) {
		$url .= '?' . $urlinfo['query'];
	}
	if ( ! empty( $urlinfo['fragment'] ) ) {
		$url .= '#' . $urlinfo['fragment'];
	}

	//qtranxf_dbg_log('qtranxf_buildURL: $url:',$url);
	return $url;
}

/**
 * @since 3.2.8 Copies the data needed for qtranxf_buildURL and qtranxf_url_set_language
 */
function qtranxf_copy_url_info( $urlinfo ) {
	$r = array();
	if ( isset( $urlinfo['scheme'] ) ) {
		$r['scheme'] = $urlinfo['scheme'];
	}
	if ( isset( $urlinfo['user'] ) ) {
		$r['user'] = $urlinfo['user'];
	}
	if ( isset( $urlinfo['pass'] ) ) {
		$r['pass'] = $urlinfo['pass'];
	}
	if ( isset( $urlinfo['host'] ) ) {
		$r['host'] = $urlinfo['host'];
	}
	if ( isset( $urlinfo['path-base'] ) ) {
		$r['path-base'] = $urlinfo['path-base'];
	}
	if ( isset( $urlinfo['path-base-length'] ) ) {
		$r['path-base-length'] = $urlinfo['path-base-length'];
	}
	if ( isset( $urlinfo['wp-path'] ) ) {
		$r['wp-path'] = $urlinfo['wp-path'];
	}
	if ( isset( $urlinfo['query'] ) ) {
		$r['query'] = $urlinfo['query'];
	}
	if ( isset( $urlinfo['fragment'] ) ) {
		$r['fragment'] = $urlinfo['fragment'];
	}
	if ( isset( $urlinfo['query_amp'] ) ) {
		$r['query_amp'] = $urlinfo['query_amp'];
	}

	return $r;
}

function qtranxf_get_address_info( $url ) {
	$info = qtranxf_parseURL( $url );
	if ( isset( $info['path'] ) ) {
		$info['path-length'] = strlen( $info['path'] );
	} else {
		$info['path']        = '';
		$info['path-length'] = 0;
	}

	return $info;
}

function qtranxf_get_home_info() {
	static $home_info;
	if ( ! $home_info ) {
		//$url = defined('WP_HOME') ? WP_HOME : get_option('home');
		$url       = get_option( 'home' );//WP does take care of WP_HOME
		$home_info = qtranxf_get_address_info( $url );
	}

	return $home_info;
}

function qtranxf_get_site_info() {
	static $site_info;
	if ( ! $site_info ) {
		//$url = defined('WP_SITEURL') ? WP_SITEURL : get_option('siteurl');
		$url       = get_option( 'siteurl' );//WP does take care of WP_SITEURL
		$site_info = qtranxf_get_address_info( $url );
	}

	return $site_info;
}

function qtranxf_get_url_info( $url ) {
	$urlinfo = qtranxf_parseURL( $url );
	qtranxf_complete_url_info( $urlinfo );
	qtranxf_complete_url_info_path( $urlinfo );

	return $urlinfo;
}

function qtranxf_complete_url_info( &$urlinfo ) {
	if ( ! isset( $urlinfo['path'] ) ) {
		$urlinfo['path'] = '';
	}
	$path          = &$urlinfo['path'];
	$home_info     = qtranxf_get_home_info();
	$site_info     = qtranxf_get_site_info();
	$home_path     = $home_info['path'];
	$site_path     = $site_info['path'];
	$home_path_len = $home_info['path-length'];
	$site_path_len = $site_info['path-length'];
	if ( $home_path_len > $site_path_len ) {
		if ( qtranxf_startsWith( $path, $home_path ) ) {
			$urlinfo['path-base']        = $home_path;
			$urlinfo['path-base-length'] = $home_path_len;
			$urlinfo['doing_front_end']  = true;
		} elseif ( qtranxf_startsWith( $path, $site_path ) ) {
			$urlinfo['path-base']        = $site_path;
			$urlinfo['path-base-length'] = $site_path_len;
			$urlinfo['doing_front_end']  = false;
		}
	} elseif ( $home_path_len < $site_path_len ) {
		if ( qtranxf_startsWith( $path, $site_path ) ) {
			$urlinfo['path-base']        = $site_path;
			$urlinfo['path-base-length'] = $site_path_len;
			$urlinfo['doing_front_end']  = false;
		} elseif ( qtranxf_startsWith( $path, $home_path ) ) {
			$urlinfo['path-base']        = $home_path;
			$urlinfo['path-base-length'] = $home_path_len;
			$urlinfo['doing_front_end']  = true;
		}
	} elseif ( $home_path != $site_path ) {
		if ( qtranxf_startsWith( $path, $home_path ) ) {
			$urlinfo['path-base']        = $home_path;
			$urlinfo['path-base-length'] = $home_path_len;
			$urlinfo['doing_front_end']  = true;
		} elseif ( qtranxf_startsWith( $path, $site_path ) ) {
			$urlinfo['path-base']        = $site_path;
			$urlinfo['path-base-length'] = $site_path_len;
			$urlinfo['doing_front_end']  = false;
		}
	} else {//$home_path == $site_path
		if ( qtranxf_startsWith( $path, $home_path ) ) {
			$urlinfo['path-base']        = $home_path;
			$urlinfo['path-base-length'] = $home_path_len;
		}
	}
}

/**
 * @since 3.2.8
 */
function qtranxf_complete_url_info_path( &$urlinfo ) {
	if ( isset( $urlinfo['path-base'] ) ) {
		if ( empty( $urlinfo['path-base'] ) ) {
			$urlinfo['wp-path'] = $urlinfo['path'];
		} elseif ( ! empty( $urlinfo['path'] ) && qtranxf_startsWith( $urlinfo['path'], $urlinfo['path-base'] ) ) {
			//qtranxf_dbg_log('qtranxf_complete_url_info_path: urlinfo: ',$urlinfo);
			if ( isset( $urlinfo['path'][ $urlinfo['path-base-length'] ] ) ) {
				if ( $urlinfo['path'][ $urlinfo['path-base-length'] ] == '/' ) {
					$urlinfo['wp-path'] = substr( $urlinfo['path'], $urlinfo['path-base-length'] );
				}
			} else {
				$urlinfo['wp-path'] = '';
			}
		}
	}
	//$urlinfo['wp-path'] is not set, means url does not belong to this WP installation
}

/**
 * Simplified version of WP's add_query_arg
 * @since 3.2.8
 */
function qtranxf_add_query_arg( &$query, $key_value ) {
	if ( empty( $query ) ) {
		$query = $key_value;
	} else {
		$query .= '&' . $key_value;
	}
}

/**
 * Simplified version of WP's remove_query_arg
 * @since 3.2.8
 */
function qtranxf_del_query_arg( &$query, $key ) {
	while ( preg_match( '/(&|&amp;|&#038;|^)(' . $key . '=[^&]+)(&|&amp;|&#038;|$)/i', $query, $matches ) ) {
		$p = strpos( $query, $matches[2] );
		$n = strlen( $matches[2] );
		if ( ! empty( $matches[1] ) ) {
			$l = strlen( $matches[1] );
			$p -= $l;
			$n += $l;
		} elseif ( ! empty( $matches[3] ) ) {
			$l = strlen( $matches[3] );
			$n += $l;
		}
		//qtranxf_dbg_log('qtranxf_del_query_arg: query: '.$query.'; p='.$p.'; n=',$n);
		$query = substr_replace( $query, '', $p, $n );
		//qtranxf_dbg_log('qtranxf_del_query_arg: query: ',$query);
	}
}

/*
 * @since 2.3.8 simplified version of esc_url
 */
function qtranxf_sanitize_url( $url ) {
	$url   = preg_replace( '|[^a-z0-9-~+_.?#=!&;,/:%@$\|*\'()\[\]\\x80-\\xff]|i', '', $url );
	$strip = array( '%0d', '%0a', '%0D', '%0A' );
	do {
		$url = str_replace( $strip, '', $url, $count );
	} while ( $count );

	return $url;
}

function qtranxf_insertDropDownElement( $language, $url, $id ) {
	global $q_config;
	$html = "
		var sb = document.getElementById('qtranxs_select_" . $id . "');
		var o = document.createElement('option');
		var l = document.createTextNode('" . $q_config['language_name'][ $language ] . "');
		";
	if ( $q_config['language'] == $language ) {
		$html .= "o.selected = 'selected';";
	}
	$html .= "
		o.value = '" . addslashes( htmlspecialchars_decode( $url, ENT_NOQUOTES ) ) . "';
		o.appendChild(l);
		sb.appendChild(o);
		";

	return $html;
}

function qtranxf_get_domain_language( $host ) {
	global $q_config;
	//todo should have hash host->lang
	//foreach($q_config['enabled_languages'] as $lang){
	//	if(!isset($q_config['domains'][$lang])) continue;
	//	if($q_config['domains'][$lang] != $host) continue;
	//	return $lang;
	//}
	foreach ( $q_config['domains'] as $lang => $h ) {
		if ( $h == $host ) {
			return $lang;
		}
	}
}

function qtranxf_external_host_ex( $host, $homeinfo ) {
	global $q_config;
	//$homehost = qtranxf_get_home_info()['host'];
	switch ( $q_config['url_mode'] ) {
		case QTX_URL_QUERY:
		case QTX_URL_PATH:
			return $homeinfo['host'] != $host;
		case QTX_URL_DOMAIN:
			return ! qtranxf_endsWith( $host, $homeinfo['host'] );
		case QTX_URL_DOMAINS:
			foreach ( $q_config['domains'] as $lang => $h ) {
				if ( $h == $host ) {
					return false;
				}
			}
			if ( $homeinfo['host'] == $host ) {
				return false;
			}
		default:
			return true;
	}
}

function qtranxf_external_host( $host ) {
	$homeinfo = qtranxf_get_home_info();

	return qtranxf_external_host_ex( $host, $homeinfo );
}

function qtranxf_isMultilingual( $str ) {
	return preg_match( '/<!--:[a-z]{2}-->|\[:[a-z]{2}\]|\{:[a-z]{2}\}/im', $str );
}

function qtranxf_is_multilingual_deep( $value ) {
	if ( is_string( $value ) ) {
		return qtranxf_isMultilingual( $value );
	} else if ( is_array( $value ) ) {
		foreach ( $value as $k => $v ) {
			if ( qtranxf_is_multilingual_deep( $v ) )//recursive call
			{
				return true;
			}
		}
	} else if ( is_object( $value ) || $value instanceof __PHP_Incomplete_Class ) {
		foreach ( get_object_vars( $value ) as $k => $v ) {
			if ( qtranxf_is_multilingual_deep( $v ) )//recursive call
			{
				return true;
			}
		}
	}

	return false;
}

function qtranxf_getLanguage() {
	global $q_config;

	return $q_config['language'];
}

function qtranxf_getLanguageDefault() {
	global $q_config;

	return $q_config['default_language'];
}

/**
 * @since 3.4.5.4 - return language name in native language, former qtranxf_getLanguageName.
 */
function qtranxf_getLanguageNameNative( $lang = '' ) {
	global $q_config;
	if ( empty( $lang ) ) {
		$lang = $q_config['language'];
	}

	return $q_config['language_name'][ $lang ];
}

/**
 * @since 3.4.5.4 - return language name in active language, if available, otherwise the name in native language.
 */
function qtranxf_getLanguageName( $lang = '' ) {
	global $q_config, $l10n;
	if ( empty( $lang ) ) {
		return $q_config['language_name'][ $q_config['language'] ];
	}
	if ( isset( $q_config['language-names'][ $lang ] ) ) {
		return $q_config['language-names'][ $lang ];
	}
	if ( ! isset( $l10n['language-names'] ) ) {//is not loaded by default, since this place should not be hit frequently
		$locale = $q_config['locale'][ $q_config['language'] ];
		if ( ! load_textdomain( 'language-names', QTRANSLATE_DIR . '/lang/language-names/language-' . $locale . '.mo' ) ) {
			if ( $locale[2] == '_' ) {
				$locale = substr( $locale, 0, 2 );
				load_textdomain( 'language-names', QTRANSLATE_DIR . '/lang/language-names/language-' . $locale . '.mo' );
			}
		}
	}
	$translations = get_translations_for_domain( 'language-names' );
	$locale       = $q_config['locale'][ $lang ];
	while ( ! isset( $translations->entries[ $locale ] ) ) {
		if ( $locale[2] == '_' ) {
			$locale = substr( $locale, 0, 2 );
			if ( isset( $translations->entries[ $locale ] ) ) {
				break;
			}
		}

		return $q_config['language-names'][ $lang ] = $q_config['language_name'][ $lang ];
	}
	$n = $translations->entries[ $locale ]->translations[0];
	if ( empty( $q_config['language_name_case'] ) ) {//Camel Case by default
		if ( function_exists( 'mb_convert_case' ) ) {// module 'mbstring' may not be installed by default: https://wordpress.org/support/topic/qtranslate_utilsphp-on-line-504
			$n = mb_convert_case( $n, MB_CASE_TITLE );
		} else {
			$msg = 'qTranslate-XT: Enable PHP module "mbstring" to get names of languages printed in "Camel Case" or disable option \'Show language names in "Camel Case"\' on admin page ' . admin_url( 'options-general.php?page=qtranslate-xt#general' ) . '. You may find more information at http://php.net/manual/en/mbstring.installation.php, or search for PHP installation options on control panel of your server provider.';
			error_log( $msg );
		}
	}

	return $q_config['language-names'][ $lang ] = $n;
}

function qtranxf_isEnabled( $lang ) {
	global $q_config;

	return isset( $q_config['locale'][ $lang ] );//only available languages are loaded, this will work quiker
	//return in_array($lang, $q_config['enabled_languages']);
}

/**
 * @since 3.2.8 - change code to improve performance
 */
function qtranxf_startsWith( $s, $n ) {
	$l = strlen( $n );
	if ( $l > strlen( $s ) ) {
		return false;
	}
	for ( $i = 0; $i < $l; ++ $i ) {
		if ( $s[ $i ] != $n[ $i ] ) {
			return false;
		}
	}

	//if($n == substr($s,0,strlen($n))) return true;
	return true;
}

/**
 * @since 3.2.8
 * $s - string to test
 * $n - needle to search
 */
function qtranxf_endsWith( $s, $n ) {
	$l = strlen( $n );
	$b = strlen( $s ) - $l;
	if ( $b < 0 ) {
		return false;
	}
	for ( $i = 0; $i < $l; ++ $i ) {
		if ( $s[ $b + $i ] != $n[ $i ] ) {
			return false;
		}
	}

	return true;
}

function qtranxf_getAvailableLanguages( $text ) {
	global $q_config;
	$blocks = qtranxf_get_language_blocks( $text );
	if ( count( $blocks ) <= 1 ) {
		return false;
	}// no languages set
	$result  = array();
	$content = qtranxf_split_languages( $blocks );
	foreach ( $content as $language => $lang_text ) {
		$lang_text = trim( $lang_text );
		if ( ! empty( $lang_text ) ) {
			$result[] = $language;
		}
	}
	if ( sizeof( $result ) == 0 ) {
		// add default language to keep default URL
		$result[] = $q_config['language'];
	}

	return $result;
}

function qtranxf_isAvailableIn( $post_id, $lang = '' ) {
	global $q_config;
	if ( empty( $lang ) ) {
		$lang = $q_config['default_language'];
	}
	global $wpdb;
	$post_content = $wpdb->get_var( $wpdb->prepare( "SELECT post_content FROM $wpdb->posts WHERE ID = %d", $post_id ) );
	//qtranxf_dbg_log('qtranxf_isAvailableIn: $post_content: ', $post_content);
	if ( empty( $post_content ) ) {
		return false;
	}
	$languages = qtranxf_getAvailableLanguages( $post_content );
	if ( $languages === false ) {
		return $lang == $q_config['default_language'];
	}

	return in_array( $lang, $languages );
}

function qtranxf_convertDateFormatToStrftimeFormat( $format ) {
	$mappings = array(
		'd' => '%d',
		'D' => '%a',
		'j' => '%E',
		'l' => '%A',
		'N' => '%u',
		'S' => '%q',
		'w' => '%f',
		'z' => '%F',
		'W' => '%V',
		'F' => '%B',
		'm' => '%m',
		'M' => '%b',
		'n' => '%i',
		't' => '%J',
		'L' => '%k',
		'o' => '%G',
		'Y' => '%Y',
		'y' => '%y',
		'a' => '%P',
		'A' => '%p',
		'B' => '%K',
		'g' => '%l',
		'G' => '%L',
		'h' => '%I',
		'H' => '%H',
		'i' => '%M',
		's' => '%S',
		'u' => '%N',
		'e' => '%Q',
		'I' => '%o',
		'O' => '%O',
		'P' => '%s',
		'T' => '%v',
		'Z' => '%1',
		'c' => '%2',
		'r' => '%3',
		'U' => '%4'
	);

	$date_parameters       = array();
	$strftime_parameters   = array();
	$date_parameters[]     = '#%#';
	$strftime_parameters[] = '%';
	foreach ( $mappings as $df => $sf ) {
		$date_parameters[]     = '#(([^%\\\\])' . $df . '|^' . $df . ')#';
		$strftime_parameters[] = '${2}' . $sf;
	}
	// convert everything
	$format = preg_replace( $date_parameters, $strftime_parameters, $format );
	// remove single backslashes from dates
	$format = preg_replace( '#\\\\([^\\\\]{1})#', '${1}', $format );
	// remove double backslashes from dates
	$format = preg_replace( '#\\\\\\\\#', '\\\\', $format );

	return $format;
}

function qtranxf_convertFormat( $format, $default_format ) {
	global $q_config;
	// if one of special language-neutral formats are requested, don't replace it
	switch ( $format ) {
		case 'Z':
		case 'c':
		case 'r':
		case 'U':
			return qtranxf_convertDateFormatToStrftimeFormat( $format );
		default:
			break;
	}
	// check for multilang formats
	$format         = qtranxf_useCurrentLanguageIfNotFoundUseDefaultLanguage( $format );
	$default_format = qtranxf_useCurrentLanguageIfNotFoundUseDefaultLanguage( $default_format );
	switch ( $q_config['use_strftime'] ) {
		case QTX_DATE:
			if ( $format == '' ) {
				$format = $default_format;
			}

			return qtranxf_convertDateFormatToStrftimeFormat( $format );
		case QTX_DATE_OVERRIDE:
			return qtranxf_convertDateFormatToStrftimeFormat( $default_format );
		case QTX_STRFTIME:
			return $format;
		case QTX_STRFTIME_OVERRIDE:
		default:
			return $default_format;
	}
}

function qtranxf_convertDateFormat( $format ) {
	global $q_config;
	if ( isset( $q_config['date_format'][ $q_config['language'] ] ) ) {
		$default_format = $q_config['date_format'][ $q_config['language'] ];
	} elseif ( isset( $q_config['date_format'][ $q_config['default_language'] ] ) ) {
		$default_format = $q_config['date_format'][ $q_config['default_language'] ];
	} else {
		$default_format = '';
	}

	return qtranxf_convertFormat( $format, $default_format );
}

function qtranxf_convertTimeFormat( $format ) {
	global $q_config;
	if ( isset( $q_config['time_format'][ $q_config['language'] ] ) ) {
		$default_format = $q_config['time_format'][ $q_config['language'] ];
	} elseif ( isset( $q_config['time_format'][ $q_config['default_language'] ] ) ) {
		$default_format = $q_config['time_format'][ $q_config['default_language'] ];
	} else {
		$default_format = '';
	}

	return qtranxf_convertFormat( $format, $default_format );
}

function qtranxf_formatCommentDateTime( $format ) {
	global $comment;

	return qtranxf_strftime( qtranxf_convertFormat( $format, $format ), mysql2date( 'U', $comment->comment_date ), '' );
}

function qtranxf_formatPostDateTime( $format ) {
	global $post;

	return qtranxf_strftime( qtranxf_convertFormat( $format, $format ), mysql2date( 'U', $post->post_date ), '' );
}

function qtranxf_formatPostModifiedDateTime( $format ) {
	global $post;

	return qtranxf_strftime( qtranxf_convertFormat( $format, $format ), mysql2date( 'U', $post->post_modified ), '' );
}

function qtranxf_getSortedLanguages( $reverse = false ) {
	global $q_config;
	$languages = $q_config['enabled_languages'];
	ksort( $languages );
	// fix broken order
	$clean_languages = array();
	foreach ( $languages as $lang ) {
		$clean_languages[] = $lang;
	}
	if ( $reverse ) {
		krsort( $clean_languages );
	}

	return $clean_languages;
}

/**
 * Evaluate if the request URI leads to a REST call.
 * This is only a prediction based on REST prefix, but no strict guarantee the REST request will be processed as such.
 *
 * @see rest_api_register_rewrites in wp_includes/rest-api.php for the REST rewrite rules using query_var = rest_route
 * @see parse_request in wp_includes/class-wp.php for the final processing of REQUEST_URI
 * @return bool
 */
function qtranxf_is_rest_request_expected() {
	return stripos( $_SERVER['REQUEST_URI'], '/' . rest_get_url_prefix() . '/' ) !== false;
}

/**
 * Evaluate if the current request allows HTTP redirection.
 * Admin requests (WP_ADMIN, DOING_AJAX, WP_CLI, DOING_CRON) or REST calls should not be redirected.
 *
 * @return bool
 */
function qtranxf_can_redirect() {
	return ! defined( 'WP_ADMIN' ) && ! defined( 'DOING_AJAX' ) && ! defined( 'WP_CLI' ) && ! defined( 'DOING_CRON' ) && empty( $_POST )
		   && ( ! qtranxf_is_rest_request_expected() )
		   //'REDIRECT_*' needs more testing
		   //&& !isset($_SERVER['REDIRECT_URL'])
		   && ( ! isset( $_SERVER['REDIRECT_STATUS'] ) || $_SERVER['REDIRECT_STATUS'] == '200' );
}

/**
 * @since 3.4
 */
function qtranxf_post_type() {
	global $post, $post_type;
	if ( $post_type ) {
		//qtranxf_dbg_log('qtranxf_post_type: global $post_type=',$post_type);
		return $post_type;
	}
	if ( $post && isset( $post->post_type ) ) {
		$post_type = $post->post_type;

		//qtranxf_dbg_log('qtranxf_post_type: $post->post_type=',$post_type);
		return $post_type;
	}
	if ( isset( $_REQUEST['post_type'] ) ) {
		$post_type = $_REQUEST['post_type'];

		//qtranxf_dbg_log('qtranxf_post_type: REQUEST[post_type]=',$post_type);
		return $post_type;
	}

	//qtranxf_dbg_log('qtranxf_post_type: null $post_type=',$post_type);
	return null;
}

/**
 * Test $cfg['pages'] against $url_path and $url_query ($_SERVER['QUERY_STRING'])
 * @since 3.4
 */
function qtranxf_match_page( $cfg, $url_path, $url_query, $d ) {
	if ( ! isset( $cfg['pages'] ) ) {
		return true;
	}
	foreach ( $cfg['pages'] as $page => $query ) {
		if ( preg_match( $d . $page . $d, $url_path ) !== 1 ) {
			continue;
		}
		//qtranxf_dbg_log('qtranxf_match_page: preg_match('.$d.$query.$d.', '.$url_query.')');
		if ( empty( $query ) || preg_match( $d . $query . $d, $url_query ) === 1 ) {
			return true;
		}
	}

	return false;
}

/**
 * @since 3.4
 */
function qtranxf_match_post_type( $cfg_post_type, $post_type ) {

	if ( is_string( $cfg_post_type ) ) {
		return preg_match( $cfg_post_type, $post_type ) === 1;
	}

	if ( isset( $cfg_post_type['exclude'] ) ) {
		if ( preg_match( $cfg_post_type['exclude'], $post_type ) === 1 ) {
			//$exclude = apply_filters('i18n_page_match_exclude_post_type', true, $cfg, $url_path, $url_query, $post_type);
			//if($exclude){// means not to provide any configuration for this post type on this page.
			return null;
			//}
		}
	}

	return true;
}

/**
 * @since 3.3.2
 */
function qtranxf_merge_config( $cfg_all, $cfg ) {
	//return array_merge_recursive($cfg_all,$cfg);
	foreach ( $cfg as $k => $v ) {
		if ( is_array( $v ) && isset( $cfg_all[ $k ] ) ) {
			$cfg_all[ $k ] = qtranxf_merge_config( $cfg_all[ $k ], $v );
		} else {
			$cfg_all[ $k ] = $v;
		}
	}

	return $cfg_all;
}

/**
 * filters i18n configurations for the current page
 */
function qtranxf_parse_page_config( $config, $url_path, $url_query ) {
	global $q_config;

	//$q_config['i18n-log-dir'] = WP_CONTENT_DIR.'/i18n-config'; //qtranxf_dbg
	if ( isset( $q_config['i18n-log-dir'] ) ) {
		if ( ! file_exists( $q_config['i18n-log-dir'] ) ) {
			if ( ! mkdir( $q_config['i18n-log-dir'] ) ) {
				unset( $q_config['i18n-log-dir'] );
			}
		}
		if ( isset( $q_config['i18n-log-dir'] ) ) {
			qtranxf_write_config_log( $config, 'all-pages' );
		}
	}

	//qtranxf_dbg_log('qtranxf_parse_page_config: $url_path: "'.$url_path.'"; $url_query: "'.$url_query.'"');
	//qtranxf_dbg_log('qtranxf_parse_page_config: $config: ', $config);
	$page_configs = array();
	foreach ( $config as $pgkey => $pgcfg ) {
		$d       = isset( $pgcfg['preg_delimiter'] ) ? $pgcfg['preg_delimiter'] : '!';
		$matched = qtranxf_match_page( $pgcfg, $url_path, $url_query, $d );
		//qtranxf_dbg_log('qtranxf_parse_page_config: $pgcfg: ', $pgcfg);
		//qtranxf_dbg_log('qtranxf_parse_page_config: $matched: ', $matched);
		if ( $matched === false ) {
			continue;
		}

		$post_type_key = '';
		if ( isset( $pgcfg['post_type'] ) ) {
			if ( is_string( $pgcfg['post_type'] ) ) {
				$post_type_key = $d . $pgcfg['post_type'] . $d;
				unset( $pgcfg['post_type'] );
			} else {
				$post_type_key = serialize( $pgcfg['post_type'] );
				foreach ( $pgcfg['post_type'] as $k => $item ) {
					$pgcfg['post_type'][ $k ] = $d . $item . $d;
				}
			}
		}
		if ( ! isset( $page_configs[ $post_type_key ] ) ) {
			$page_configs[ $post_type_key ] = array();
		}
		$page_config = &$page_configs[ $post_type_key ];

		foreach ( $pgcfg as $key => $cfg ) {
			if ( empty( $cfg ) ) {
				continue;
			}
			switch ( $key ) {
				case 'anchors':
					{
						//Anchor elements are defined by id only.
						//Merge unique id values only:
						foreach (
							$cfg
							as $k => $anchor
						) {
							$id = qtranxf_standardize_config_anchor( $anchor );
							if ( is_null( $id ) ) {
								continue;
							}
							if ( ! is_string( $id ) ) {
								$id = $k;
							}
							if ( ! isset( $page_config['anchors'] ) ) {
								$page_config['anchors'] = array();
							}
							$page_config['anchors'][ $id ] = $anchor;
						}
					}
					break;
				case 'forms':
					{
						if ( ! isset( $page_config['forms'] ) ) {
							$page_config['forms'] = array();
						}
						foreach (
							$cfg
							as $form_id => $pgcfg_form
						) {
							if ( ! isset( $pgcfg_form['fields'] ) ) {
								continue;
							}
							// convert obsolete format for 'fields'
							foreach (
								$pgcfg_form['fields']
								as $k => $f
							) {
								if ( ! isset( $f['id'] ) ) {
									continue;
								}
								$id = $f['id'];
								unset( $f['id'] );
								$pgcfg_form['fields'][ $id ] = $f;
								if ( $id !== $k ) {
									unset( $pgcfg_form['fields'][ $k ] );
								}
							}
							//figure out obsolete id of form/collection
							if ( is_string( $form_id ) ) {
								$id = $form_id;
							} else if ( isset( $pgcfg_form['form']['id'] ) ) {
								$id = $pgcfg_form['form']['id'];
								unset( $pgcfg_form['form']['id'] );
								if ( empty( $pgcfg_form['form'] ) ) {
									unset( $pgcfg_form['form'] );
								}
							} else {
								$id = '';
							}
							if ( ! isset( $page_config['forms'][ $id ] ) ) {
								$page_config['forms'][ $id ] = $pgcfg_form;
							} else {
								$page_config['forms'][ $id ] = qtranxf_merge_config( $page_config['forms'][ $id ], $pgcfg_form );
							}
						}
					}
					break;
				default:
					{
						if ( ! isset( $page_config[ $key ] ) ) {
							$page_config[ $key ] = $cfg;
						} else {
							$page_config[ $key ] = qtranxf_merge_config( $page_config[ $key ], $cfg );
						}
					}
			}
		}
	}

	//qtranxf_dbg_log('qtranxf_parse_page_config: $page_configs: ', $page_configs);
	foreach ( $page_configs as $post_type_key => &$page_config ) {
		//if(!empty($post_type_key))
		//qtranxf_dbg_log('qtranxf_parse_page_config: $post_type_key="'.$post_type_key.'"; page_config: ', $page_config);
		if ( ! empty( $page_config ) ) {
			//clean up 'fields'
			if ( ! empty( $page_config['forms'] ) ) {
				foreach ( $page_config['forms'] as $form_id => $frm ) {
					if ( ! isset( $frm['fields'] ) ) {
						continue;
					}
					foreach ( $frm['fields'] as $k => $f ) {
						if ( qtranxf_set_field_jquery( $f ) ) {
							$page_config['forms'][ $form_id ]['fields'][ $k ] = $f;
						}
					}
				}
			}
			foreach ( $page_config as $k => $cfg ) {
				if ( empty( $cfg ) ) {
					unset( $page_config[ $k ] );
				}
			}
		}
		if ( empty( $page_config ) ) {
			unset( $page_configs[ $post_type_key ] );
		}
	}

	if ( isset( $q_config['i18n-log-dir'] ) ) {
		qtranxf_write_config_log( $page_configs, 'by-post-type', $url_path, $url_query );
	}

	return $page_configs;
}

function qtranxf_write_config_log( $config, $sfx = '', $url_path = null, $url_query = null, $post_type = null ) {
	global $q_config;
	if ( empty( $q_config['i18n-log-dir'] ) ) {
		return;
	}
	if ( ! is_null( $url_path ) && empty( $url_path ) ) {
		if ( defined( 'WP_ADMIN' ) ) {
			global $pagenow;
			$url_path = $pagenow;
		} else {
			$url_path = $q_config['url_info']['wp-path'];
		}
	}
	if ( ! is_null( $url_query ) && empty( $url_query ) ) {
		$url_query = isset( $q_config['url_info']['query'] ) ? $q_config['url_info']['query'] : '';
	}
	$nm = '';
	if ( ! empty( $url_path ) ) {
		$nm = preg_replace( '![/?&=#\.]+!', '-', trim( $url_path, '/' ) );
	}
	if ( ! empty( $url_query ) ) {
		$nm .= '-' . preg_replace( '![/?&=#\.]+!', '-', $url_query );
	}
	if ( empty( $nm ) && ! is_null( $url_path ) ) {
		$nm = 'fronthome';
	}
	if ( ! empty( $sfx ) ) {
		if ( ! empty( $nm ) ) {
			$nm .= '-';
		}
		$nm .= $sfx;
	}

	$fnm = $q_config['i18n-log-dir'] . '/i18n-config-' . $nm . '.json';
	if ( empty( $config ) ) {
		if ( file_exists( $fnm ) ) {
			unlink( $fnm );
		}

		return;
	}
	$fh = fopen( $fnm, 'w' );
	if ( $fh ) {
		if ( ! empty( $url_path ) ) {
			fwrite( $fh, 'url_path: "' . $url_path . '"' . PHP_EOL );
		}
		if ( ! empty( $url_query ) ) {
			fwrite( $fh, 'url_query: "' . $url_query . '"' . PHP_EOL );
		}
		if ( ! empty( $post_type ) ) {
			fwrite( $fh, 'post_type: "' . $post_type . '"' . PHP_EOL );
		}
		$title = 'config';
		if ( ! empty( $sfx ) ) {
			$title .= '-' . $sfx;
		}
		fwrite( $fh, $title . ': ' . PHP_EOL . json_encode( $config, JSON_PRETTY_PRINT | JSON_UNESCAPED_SLASHES ) . PHP_EOL );
		fclose( $fh );
	}
}

/**
 * @since 3.4
 */
function qtranxf_add_filters( $filters ) {
	global $q_config;
	//qtranxf_dbg_log('qtranxf_add_filters: $filters: ', $filters);
	if ( ! empty( $filters['text'] ) ) {
		//qtranxf_dbg_log('$filters[text]: ', $filters['text']);
		foreach ( $filters['text'] as $nm => $pr ) {
			if ( $pr === '' ) {
				continue;
			}
			//qtranxf_dbg_log('$filters[text]['.$nm.']: ', $pr);
			add_filter( $nm, 'qtranxf_useCurrentLanguageIfNotFoundUseDefaultLanguage', $pr );
		}
	}
	if ( ! empty( $filters['url'] ) ) {
		//qtranxf_dbg_log('$filters[url]: ',$filters['url']);
		foreach ( $filters['url'] as $nm => $pr ) {
			if ( $pr === '' ) {
				continue;
			}
			//qtranxf_dbg_log('$filters[url]['.$nm.']: ', $pr);
			add_filter( $nm, 'qtranxf_convertURL', $pr );
		}
	}
	if ( ! empty( $filters['term'] ) ) {
		//qtranxf_dbg_log('$filters[term]: ',$filters['term']);
		foreach ( $filters['term'] as $nm => $pr ) {
			if ( $pr === '' ) {
				continue;
			}
			//qtranxf_dbg_log('$filters[term]['.$nm.']: ', $pr);
			add_filter( $nm, 'qtranxf_useTermLib', $pr );
		}
	}
}

/**
 * @since 3.4.6.9
 */
function qtranxf_remove_filters( $filters ) {
	global $q_config;
	//qtranxf_dbg_log('qtranxf_add_filters: $filters: ', $filters);
	if ( ! empty( $filters['text'] ) ) {
		//qtranxf_dbg_log('$filters[text]: ', $filters['text']);
		foreach ( $filters['text'] as $nm => $pr ) {
			if ( $pr === '' ) {
				continue;
			}
			//qtranxf_dbg_log('$filters[text]['.$nm.']: ', $pr);
			remove_filter( $nm, 'qtranxf_useCurrentLanguageIfNotFoundUseDefaultLanguage', $pr );
		}
	}
	if ( ! empty( $filters['url'] ) ) {
		//qtranxf_dbg_log('$filters[url]: ',$filters['url']);
		foreach ( $filters['url'] as $nm => $pr ) {
			if ( $pr === '' ) {
				continue;
			}
			//qtranxf_dbg_log('$filters[url]['.$nm.']: ', $pr);
			remove_filter( $nm, 'qtranxf_convertURL', $pr );
		}
	}
	if ( ! empty( $filters['term'] ) ) {
		//qtranxf_dbg_log('$filters[term]: ',$filters['term']);
		foreach ( $filters['term'] as $nm => $pr ) {
			if ( $pr === '' ) {
				continue;
			}
			//qtranxf_dbg_log('$filters[term]['.$nm.']: ', $pr);
			remove_filter( $nm, 'qtranxf_useTermLib', $pr );
		}
	}
}

/**
 * @since 3.4
 */
function qtranxf_html_locale( $locale ) {
	return str_replace( '_', '-', $locale );
}

function qtranxf_match_language_locale( $locale ) {
	global $q_config;
	foreach ( $q_config['enabled_languages'] as $lang ) {
		if ( qtranxf_html_locale( $q_config['locale'][ $lang ] ) == $locale ) {
			return $lang;
		}
		if ( $q_config['locale'][ $lang ] == $locale ) {
			return $lang;
		}
		if ( ! empty( $q_config['locale_html'][ $lang ] ) && $q_config['locale_html'][ $lang ] == $locale ) {
			return $lang;
		}
	}
	$locale_code = substr( $locale, 0, 2 );
	foreach ( $q_config['enabled_languages'] as $lang ) {
		if ( $locale_code == $lang ) {
			return $lang;
		}
	}
}

function qtranxf_get_page_referer() {
	if ( defined( 'DOING_AJAX' ) ) {
		global $q_config;
		if ( isset( $q_config['url_info']['page_referer'] ) ) {
			return $q_config['url_info']['page_referer'];
		}
		if ( ! empty( $q_config['url_info']['http_referer'] ) ) {
			$page  = basename( $q_config['url_info']['http_referer'] );
			$epage = explode( '?', $page );
			$page  = $epage[0];
			//$page = explode('?',$page)[0];//does not work in older PHP
			$q_config['url_info']['page_referer'] = $page;

			return $page;
		}
	}
	global $pagenow;

	return $pagenow;
}