<?php
/* vim: set expandtab sw=4 ts=4 sts=4: */
/**
 * Config file generator
 *
 * @package PhpMyAdmin-Setup
 */

/**
 * Config file generation class
 *
 * @package PhpMyAdmin
 */
class ConfigGenerator
{
	/**
	 * Creates config file
	 *
	 * @param ConfigFile $cf Config file instance
	 *
	 * @return string
	 */
	public static function getConfigFile(ConfigFile $cf)
	{
		$crlf = (isset($_SESSION['eol']) && $_SESSION['eol'] == 'win')
			? "\r\n"
			: "\n";
		$c = $cf->getConfig();

		// header
		$ret = '<?php' . $crlf
			. '/*' . $crlf
			. ' * Generated configuration file' . $crlf
			. ' * Generated by: phpMyAdmin '
					. $GLOBALS['PMA_Config']->get('PMA_VERSION')
					. ' setup script' . $crlf
			. ' * Date: ' . date(DATE_RFC1123) . $crlf
			. ' */' . $crlf . $crlf;

		// servers
		if ($cf->getServerCount() > 0) {
			$ret .= "/* Servers configuration */$crlf\$i = 0;" . $crlf . $crlf;
			foreach ($c['Servers'] as $id => $server) {
				$ret .= '/* Server: '
					. strtr($cf->getServerName($id) . " [$id] ", '*/', '-')
					. "*/" . $crlf
					. '$i++;' . $crlf;
				foreach ($server as $k => $v) {
					$k = preg_replace('/[^A-Za-z0-9_]/', '_', $k);
					$ret .= "\$cfg['Servers'][\$i]['$k'] = "
						. (is_array($v) && self::_isZeroBasedArray($v)
								? self::_exportZeroBasedArray($v, $crlf)
								: var_export($v, true))
						. ';' . $crlf;
				}
				$ret .= $crlf;
			}
			$ret .= '/* End of servers configuration */' . $crlf . $crlf;
		}
		unset($c['Servers']);

		// other settings
		$persistKeys = $cf->getPersistKeysMap();

		foreach ($c as $k => $v) {
			$k = preg_replace('/[^A-Za-z0-9_]/', '_', $k);
			$ret .= self::_getVarExport($k, $v, $crlf);
			if (isset($persistKeys[$k])) {
				unset($persistKeys[$k]);
			}
		}
		// keep 1d array keys which are present in $persist_keys (config.values.php)
		foreach (array_keys($persistKeys) as $k) {
			if (/*overload*/mb_strpos($k, '/') === false) {
				$k = preg_replace('/[^A-Za-z0-9_]/', '_', $k);
				$ret .= self::_getVarExport($k, $cf->getDefault($k), $crlf);
			}
		}
		$ret .= '?' . '>';

		return $ret;
	}

	/**
	 * Returns exported configuration variable
	 *
	 * @param string $var_name	configuration name
	 * @param mixed	 $var_value configuration value(s)
	 * @param string $crlf		line ending
	 *
	 * @return string
	 */
	private static function _getVarExport($var_name, $var_value, $crlf)
	{
		if (!is_array($var_value) || empty($var_value)) {
			return "\$cfg['$var_name'] = "
				. var_export($var_value, true) . ';' . $crlf;
		}
		$ret = '';
		if (self::_isZeroBasedArray($var_value)) {
			$ret = "\$cfg['$var_name'] = "
				. self::_exportZeroBasedArray($var_value, $crlf)
				. ';' . $crlf;
		} else {
			// string keys: $cfg[key][subkey] = value
			foreach ($var_value as $k => $v) {
				$k = preg_replace('/[^A-Za-z0-9_]/', '_', $k);
				$ret .= "\$cfg['$var_name']['$k'] = "
					. var_export($v, true) . ';' . $crlf;
			}
		}
		return $ret;
	}

	/**
	 * Check whether $array is a continuous 0-based array
	 *
	 * @param array $array Array to check
	 *
	 * @return boolean
	 */
	private static function _isZeroBasedArray(array $array)
	{
		for ($i = 0, $nb = count($array); $i < $nb; $i++) {
			if (! isset($array[$i])) {
				return false;
			}
		}
		return true;
	}

	/**
	 * Exports continuous 0-based array
	 *
	 * @param array	 $array Array to export
	 * @param string $crlf	Newline string
	 *
	 * @return string
	 */
	private static function _exportZeroBasedArray(array $array, $crlf)
	{
		$retv = array();
		foreach ($array as $v) {
			$retv[] = var_export($v, true);
		}
		$ret = "array(";
		if (count($retv) <= 4) {
			// up to 4 values - one line
			$ret .= implode(', ', $retv);
		} else {
			// more than 4 values - value per line
			$imax = count($retv);
			for ($i = 0; $i < $imax; $i++) {
				$ret .= ($i > 0 ? ',' : '') . $crlf . '	   ' . $retv[$i];
			}
		}
		$ret .= ')';
		return $ret;
	}
}
?>
