<?php
/*
** Zabbix
** Copyright (C) 2001-2016 Zabbix SIA
**
** This program is free software; you can redistribute it and/or modify
** it under the terms of the GNU General Public License as published by
** the Free Software Foundation; either version 2 of the License, or
** (at your option) any later version.
**
** This program is distributed in the hope that it will be useful,
** but WITHOUT ANY WARRANTY; without even the implied warranty of
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
** GNU General Public License for more details.
**
** You should have received a copy of the GNU General Public License
** along with this program; if not, write to the Free Software
** Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
**/


abstract class CValidator {

	/**
	 * Name of the object that can be used in error message. If it is set, it will replace the %1$s placeholder and
	 * all other places holders will be shifted by +1.
	 *
	 * @var string
	 */
	protected $objectName;

	/**
	 * Validation errors.
	 *
	 * @var array
	 */
	private $error;

	public function __construct(array $options = []) {
		// set options
		foreach ($options as $key => $value) {
			$this->$key = $value;
		}
	}

	/**
	 * Returns true if the given $value is valid, or set's an error and returns false otherwise.
	 *
	 * @abstract
	 *
	 * @param $value
	 *
	 * @return bool
	 */
	abstract public function validate($value);

	/**
	 * Get first validation error.
	 *
	 * @return string
	 */
	public function getError() {
		return $this->error;
	}

	/**
	 * Add validation error.
	 *
	 * @param $error
	 */
	protected function setError($error) {
		$this->error = $error;
	}

	/**
	 * @param string $name
	 */
	public function setObjectName($name) {
		$this->objectName = $name;
	}

	/**
	 * Throws an exception when trying to set an unexisting validator option.
	 *
	 * @param $name
	 * @param $value
	 *
	 * @throws Exception
	 */
	public function __set($name, $value) {
		throw new Exception(sprintf('Incorrect option "%1$s" for validator "%2$s".', $name, get_class($this)));
	}

	/**
	 * Adds a validation error with custom parameter support. The value of $objectName will be passed as the
	 * first parameter.
	 *
	 * @param string 	$message
	 * @param mixed 	$param 		parameter to be replace the first placeholder
	 * @param mixed 	$param,... 	unlimited number of optional parameters
	 *
	 * @return string
	 */
	protected function error($message) {
		$arguments = array_slice(func_get_args(), 1);

		if ($this->objectName !== null) {
			array_unshift($arguments, $this->objectName);
		}

		$this->setError(vsprintf($message, $arguments));
	}


	/**
	 * Returns string represenation of a variable
	 *
	 * @param mixed $value
	 * @return string
	 */
	protected function stringify($value) {
		if (is_bool($value)) {
			return $value ? 'true' : 'false';
		}
		elseif (is_null($value)) {
			return 'null';
		}
		elseif (is_object($value)) {
			return get_class($value);
		}
		elseif (is_scalar($value)) {
			return (string)$value;
		}
		else {
			return gettype($value);
		}
	}
}
