<?php
/**
 * Magento
 *
 * NOTICE OF LICENSE
 *
 * This source file is subject to the Open Software License (OSL 3.0)
 * that is bundled with this package in the file LICENSE.txt.
 * It is also available through the world-wide-web at this URL:
 * http://opensource.org/licenses/osl-3.0.php
 * If you did not receive a copy of the license and are unable to
 * obtain it through the world-wide-web, please send an email
 * to license@magentocommerce.com so we can send you a copy immediately.
 *
 * DISCLAIMER
 *
 * Do not edit or add to this file if you wish to upgrade Magento to newer
 * versions in the future. If you wish to customize Magento for your
 * needs please refer to http://www.magentocommerce.com for more information.
 *
 * @category    Mage
 * @package     Mage_Connect
 * @copyright   Copyright (c) 2009 Irubin Consulting Inc. DBA Varien (http://www.varien.com)
 * @license     http://opensource.org/licenses/osl-3.0.php  Open Software License (OSL 3.0)
 */

/**
 * Class to validate string resources
 *
 * @category    Mage
 * @package     Mage_Connect
 * @author      Magento Core Team <core@magentocommerce.com>
 */

class Mage_Connect_Validator
{
	protected static $_stability = array(0=>'devel',1=>'alpha',2=>'beta',3=>'stable');

	
	public static function getStabilities()
	{
	    return self::$_stability;
	}
	
	
	/**
	 * Compare stabilities. Returns:
	 * 
	 * -1 if the first stability is lower than the second
	 *  0 if they are equal
	 *  1 if the second is lower. 
	 * @param $s1
	 * @param $s2
	 * @return int
	 */
	public function compareStabilities($s1, $s2)
	{
	    $list = $this->getStabilities();
	    $tmp = array_combine(array_values($list),array_keys($list));
	    
	    if(!isset($tmp[$s1], $tmp[$s2])) {
	        throw new Exception("Invalid stability in compareStabilities argument");
	    }
	    
	    	    
	    // 'stable' turns to 3
	    // 'devel' turns to 0	    
	    $s1 = $tmp[$s1];
	    $s2 = $tmp[$s2];
	    if($s1 === $s2) {
	        return 0;
	    } elseif($s1 > $s2) {
	        return 1;
	    } elseif($s1 < $s2) {
	        return -1;
	    }	    
	}
	
	/**
	 * Constructor
	 */
	public function __construct()
	{

	}

	/**
	 * Validate max len of string
	 * @param string $str
	 * @param int $maxLen
	 * @return bool
	 */
	public function validateMaxLen($str, $maxLen)
	{
		return strlen((string) $str) <= (int) $maxLen;
	}

	/**
    * Validate channel name and url
    *
    * @param mixed $str
    * @return bool
    */
    public function validateChannelNameOrUri($str)
	{
	    return ( $this->validateUrl($str) || $this->validatePackageName($str));
	}

    /**
    * Validate License url
    *
    * @param mixed $str
    * @return boolean
    */
    public function validateLicenseUrl($str)
    {
        if ($str) {
            return ( $this->validateUrl($str) || $this->validatePackageName($str));
        }
        return true;
    }

    /**
     * Validate compatible data
     * @param array $data
     * @return bool
     */
	public function validateCompatible(array $data)
	{
	    if(!count($data)) {
	    	/**
	    	 * Allow empty
	    	 */
            return true;
        }
        $count = 0;
        foreach($data as $k=>$v) {
           foreach(array('name','channel','min','max') as $fld) {
           	  $$fld = trim($v[$fld]);
           }
           $count++;

           $res = $this->validateUrl($channel) && strlen($channel);
           if(!$res) {
              $this->addError("Invalid or empty channel in compat. #{$count}");
           }

           $res = $this->validatePackageName($name) && strlen($name);
           if(!$res) {
              $this->addError("Invalid or empty name in compat. #{$count}");
           }
           $res1 = $this->validateVersion($min);
           if(!$res1) {
              $this->addError("Invalid or empty minVersion in compat. #{$count}");
           }
           $res2 = $this->validateVersion($max);
           if(!$res2) {
              $this->addError("Invalid or empty maxVersion in compat. #{$count}");
           }
           if($res1 && $res2 && $this->versionLower($max, $min)) {
           	  $this->addError("Max version is lower than min in compat #{$count}");
           }

        }
        return ! $this->hasErrors();
	}

	/**
	 * Validate authors of package
	 * @param array $authors
	 * @return bool
	 */
	public function validateAuthors(array $authors)
	{
		if(!count($authors)) {
			$this->addError('Empty authors section');
			return false;
		}
		$count = 0;
		foreach($authors as $k=>$v) {
		   $count++;
		   array_map('trim', $v);
		   $name = $v['name'];
		   $login = $v['user'];
		   $email = $v['email'];
		   $res = $this->validateMaxLen($name, 256) && strlen($name);
           if(!$res) {
              $this->addError("Invalid or empty name for author #{$count}");
           }
		   $res = $this->validatePackageName($login) && strlen($login);
		   if(!$res) {
		   	  $this->addError("Invalid or empty login for author #{$count}");
		   }
		   $res = $this->validateEmail($email);
		   if(!$res) {
		   	  $this->addError("Invalid or empty email for author #{$count}");
		   }
		}
		return ! $this->hasErrors();
	}


	/**
	 * Validator errors
	 * @var array
	 */
	private $_errors = array();

	/**
	 * Add error
	 * @param string $err
	 * @return
	 */
	private function addError($err)
	{
		$this->_errors[] = $err;
	}

	/**
	 * Set validator errors
	 * @param array $err
	 * @return
	 */

	private function setErrors(array $err)
	{
		$this->_errors = $err;
	}

	/**
	 * Clear validator errors
	 * @return
	 */
	private function clearErrors()
	{
		$this->_errors = array();
	}

	/**
	 * Check if there are validator errors set
	 * @return unknown_type
	 */
	public function hasErrors()
	{
		return count($this->_errors) != 0;
	}


	/**
	 * Get errors
	 * @param bool $clear if true after this call erros will be cleared
	 * @return array
	 */
	public function getErrors($clear = true)
	{
		$out = $this->_errors;
		if($clear) {
			$this->clearErrors();
		}
		return $out;
	}

	/**
	 * Validate URL
	 * @param string $str
	 * @return bool
	 */
	public function validateUrl($str)
	{
		$regex = "@([0-9]{1,3}\\.[0-9]{1,3}\\.[0-9]{1,3}\\.[0-9]{1,3}|"
		."(((news|telnet|nttp|file|http|ftp|https)://)|(www|ftp)"
		."[-A-Za-z0-9]*\\.)[-A-Za-z0-9\\.]+)(:[0-9]*)?@i";
		return preg_match($regex, $str);
	}


	/**
	 * Validates package stability
	 * @param string $str
	 * @return bool
	 */
	public function validateStability($str)
	{
		return in_array(strval($str), self::$_stability);
	}

	/**
	 * Validate date format
	 * @param $date
	 * @return bool
	 */
	public function validateDate($date)
	{
		$subs = null;
		$check1 = preg_match("/^([\d]{4})-([\d]{2})-([\d]{2})$/i", $date, $subs);
		if(!$check1) {
			return false;
		}
		return checkdate($subs[2], $subs[3], $subs[1]);
	}


	/**
	 * Validate email
	 * @param string $email
	 * @return bool
	 */
	public function validateEmail($email)
	{
		return preg_match("/^([a-z0-9\+_\-]+)(\.[a-z0-9\+_\-]+)*@([a-z0-9\-]+\.)+[a-z]{2,6}$/ix", $email);
	}

	/**
	 * Validate package name
	 * @param $name
	 * @return bool
	 */
	public function validatePackageName($name)
	{
		return preg_match("/^[a-zA-Z0-9_-]+$/i", $name);
	}

	/**
	 * Validate version number
	 * @param string $version
	 * @return bool
	 */
	public function validateVersion($version)
	{
		return preg_match("/^[\d]+\.[\d]+\.[\d]+([[:alnum:]\.\-\_]+)?$/i", $version);
	}

	/**
	 * Check versions are equal
	 * @param string $v1
	 * @param string $v2
	 * @return bool
	 */
	public function versionEqual($v1, $v2)
	{
		return version_compare($v1, $v2, "==");
	}

	/**
	 * Check version $v1 <= $v2
	 * @param string $v1
	 * @param string $v2
	 * @return bool
	 */
	public function versionLowerEqual($v1, $v2)
	{
		return version_compare($v1, $v2, "le");
	}


	/**
	 * Check if version $v1 lower than $v2
	 * @param string $v1
	 * @param string $v2
	 * @return bool
	 */
	public function versionLower($v1, $v2)
	{
		return version_compare($v1, $v2, "<");
	}

	/**
	 * Check version $v1 >= $v2
	 * @param string $v1
	 * @param string $v2
	 * @return bool
	 */
	public function versionGreaterEqual($v1, $v2)
	{
		return version_compare($v1, $v2, "ge");
	}


	/**
	 * Generic regex validation
	 * @param string $str
	 * @param string $regex
	 * @return bool
	 */
	public function validateRegex($str, $regex)
	{
		return preg_match($regex, $str);
	}


	/**
	 * Check if PHP extension loaded
	 * @param string $name Extension name
	 * @return bool
	 */
	public function validatePhpExtension($name)
	{
        return extension_loaded($name);
	}


	public function validatePHPVersion($min, $max, $ver = PHP_VERSION)
	{
	    $minAccepted = true;
	    if($min) {
	        $minAccepted = version_compare($ver, $min, ">=");
	    }
	    $maxAccepted = true;
	    if($max) {
	        $maxAccepted = version_compate($ver, $max, "<=");
	    }
	    return (bool) $minAccepted && $maxAccepted;
	}


}