<?php

class InstallConfig {

	static public $sFileConfig=null;
	static public $sLastError=null;

	static public function save($mName,$mValue=null) {
		if (!self::checkFile()) {
			return false;
		}
		if (is_array($mName)) {
			$aValues=$mName;
		} else {
			$aValues=array($mName=>$mValue);
		}

		$sContent = file_get_contents(self::$sFileConfig);
		foreach($aValues as $sName=>$mValue) {
			$sContent=self::_writeValue($sName,$mValue,$sContent);
		}
		file_put_contents(self::$sFileConfig,$sContent);
		return true;
	}

	static public function get($sName,$mDefault=null) {
		if (!self::checkFile(false)) {
			return $mDefault;
		}

		$aConfig=include(self::$sFileConfig);

		if (strpos($sName, '.')) {
			$sVal = $aConfig;
			$aKeys = explode('.', $sName);
			foreach ($aKeys as $k) {
				if (isset($sVal[$k])) {
					$sVal = $sVal[$k];
				} else {
					return $mDefault;
				}
			}
		} else {
			if (isset($aConfig[$sName])) {
				$sVal=$aConfig[$sName];
			} else {
				return $mDefault;
			}
		}
		return $sVal;

	}

	static public function _writeValue($sName,$mValue,$sContent) {
		$sName='$config[\''.implode('\'][\'', explode('.',$sName)).'\']';
		$mValue=self::_convertToConfigValue($mValue);
		/**
		 * Если переменная уже определена в конфиге,
		 * то меняем значение.
		 */
		if(substr_count($sContent, $sName)) {
			$sContent=preg_replace("~".preg_quote($sName).".+;~Ui", $sName.' = '.$mValue.';', $sContent);
		} else {
			$sContent=str_replace('return $config;', $sName.' = '.$mValue.';'.PHP_EOL.'return $config;', $sContent);
		}
		return $sContent;
	}

	static public function _convertToConfigValue($mValue) {
		switch(true) {
			case is_string($mValue):
				return "'".addslashes($mValue)."'";

			case is_bool($mValue):
				return ($mValue)?"true":"false";

			case is_array($mValue):
				$sArrayString="";
				foreach($mValue as $sKey=>$sValue) {
					$sArrayString .= "'{$sKey}'=>".self::_convertToConfigValue($sValue).",";
				}
				return "array(".$sArrayString.")";

			case is_numeric($mValue):
				return $mValue;

			default:
				return "'".(string)$mValue."'";
		}
	}

	static public function checkFile($bCheckWritable=true) {
		if (is_null(self::$sFileConfig) or !file_exists(self::$sFileConfig)) {
			self::$sLastError=InstallCore::getLang('config.errors.file_not_found');
			return false;
		}
		if ($bCheckWritable) {
			if (!is_writable(self::$sFileConfig)) {
				self::$sLastError=InstallCore::getLang('config.errors.file_not_writable');
				return false;
			}
		}
		return true;
	}

}