<?php
/** DomFramework
    @package domframework
    @author Dominique Fournier <dominique@fournier38.fr> */

/** Permit to check the validity of fields */
class verify
{
  /////////////////
  //   NETWORK   //
  /////////////////
  /** Check if $val is a valid IPv4
    * Return true or false
    * @param string $val The IP to test
    */
  public function is_ip ($val)
  {
    return \verify::staticIs_ip ($val);
  }

  /** Check if $val is a valid IPv4 in static mode
    * Return true or false
    * @param string $val The IP to test
    */
  public function staticIs_ip ($val)
  {
    if (filter_var ($val, FILTER_VALIDATE_IP))
      return true;
    return false;
  }

  /** Check if $val is a valid IPv4
    * Return true or false
    * @param string $val The IPv4 to test
    */
  public function is_ipv4 ($val)
  {
    return \verify::staticIs_ipv4 ($val);
  }

  /** Check if $val is a valid IPv4 in static mode
    * Return true or false
    * @param string $val The IPv4 to test
    */
  public function staticIs_ipv4 ($val)
  {
    if (filter_var ($val, FILTER_VALIDATE_IP, FILTER_FLAG_IPV4))
      return true;
    return false;
  }

  /** Check if $val is a valid IPv6
    * Return true or false
    * @param string $val The IPv6 to test
    */
  public function is_ipv6 ($val)
  {
    return \verify::staticIs_ipv6 ($val);
  }

  /** Check if $val is a valid IPv6 in static mode
    * Return true or false
    * @param string $val The IPv6 to test
    */
  public static function staticIs_ipv6 ($val)
  {
    if (filter_var ($val, FILTER_VALIDATE_IP, FILTER_FLAG_IPV6))
      return true;
    return false;
  }

  /** Check if $val is a valid hostname (without domain)
    * Return true or false
    * @param string $val The hostname to check
    */
  public function is_hostname ($val)
  {
    return \verify::staticIs_hostname ($val);
  }

  /** Check if $val is a valid hostname (without domain)
    * Return true or false
    * @param string $val The hostname to check
    */
  public static function staticIs_hostname ($val)
  {
    if (strlen ($val) < 2 || strlen ($val) > 128)
      return false;
    if (strspn ($val, "abcdefghijklmnopqrstuvwxyz".
                      "ABCDEFGHIJKLMNOPQRSTUVWXYZ".
                      "0123456789-.") !==
      strlen ($val))
      return false;
    // No end dot ?
    if (substr ($val, -1) === ".")
      return false;
    return true;
  }

  /** Check if $val is a valid domain (without hostname)
    * Return true or false
    * @param string $val The domain to check
    */
  public function is_domain ($val)
  {
    return \verify::staticIs_domain ($val);
  }

  /** Check if $val is a valid domain (without hostname) in static mode
    * Return true or false
    * @param string $val The domain to check
    */
  public static function staticIs_domain ($val)
  {
    if (strlen ($val) < 2 || strlen ($val) > 128)
      return false;
    if (strspn ($val, "abcdefghijklmnopqrstuvwxyz".
                      "ABCDEFGHIJKLMNOPQRSTUVWXYZ".
                      "0123456789-.") !==
      strlen ($val))
      return false;
    // No end dot ?
    if (substr ($val, -1) === ".")
      return false;
    return true;
  }

  /** Check if $val is a valid FQDN
    * Return true or false
    * @param string $val The FQDN to check
    */
  public function is_FQDN ($val)
  {
    return \verify::staticIs_FQDN ($val);
  }

  /** Check if $val is a valid FQDN in static mode
    * Return true or false
    * @param string $val The FQDN to check
    */
  public static function staticIs_FQDN ($val)
  {
    if (strlen ($val) < 2 || strlen ($val) > 255)
      return false;
    if (\verify::is_ip ($val))
      return false;
    if (strspn ($val, "abcdefghijklmnopqrstuvwxyz".
                      "ABCDEFGHIJKLMNOPQRSTUVWXYZ".
                      "0123456789-.") !==
      strlen ($val))
      return false;
    // No end dot ?
    if (substr ($val, -1) === ".")
      return false;
    return true;
  }

  ///////////////
  //   DATES   //
  ///////////////
  /** Check if $val is a valid date and time in SQL
      A valid date is 2014-03-20 12:27:34
      Return true or false
      @param string $val The date to check */
  public function is_datetimeSQL ($val)
  {
    return \verify::staticIs_datetimeSQL ($val);
  }

  /** Check if $val is a valid date and time in SQL in static mode
      A valid date is 2014-03-20 12:27:34
      Return true or false
      @param string $val The date to check */
  public static function staticIs_datetimeSQL ($val)
  {
    if (strlen ($val) !== 19)
      return false;
    $arr = \date_parse ($val);
    if ($arr["warning_count"] !==0)
      return false;
    if ($arr["error_count"] !==0)
      return false;
    if (isset ($arr["tz_abbr"]))
      return false;
    if (strspn ($val, "0123456789 :-") !== strlen ($val))
      return false;
    if (\DateTime::createFromFormat("Y-m-d H:i:s", $val) === false)
      return false;
    return true;
  }

  /** Check if $val is a valid date in SQL
      A valid date is 2014-03-20
      Return true or false
      @param string $val The date to check */
  public function is_dateSQL ($val)
  {
    return \verify::staticIs_dateSQL ($val);
  }

  /** Check if $val is a valid date in SQL in static mode
      A valid date is 2014-03-20
      Return true or false
      @param string $val The date to check */
  public static function staticIs_dateSQL ($val)
  {
    if (strlen ($val) !== 10)
      return false;
    $arr = \date_parse ($val);
    if ($arr["warning_count"] !==0)
      return false;
    if ($arr["error_count"] !==0)
      return false;
    if (isset ($arr["tz_abbr"]))
      return false;
    if (strspn ($val, "0123456789-") !== strlen ($val))
      return false;
    if (\DateTime::createFromFormat("Y-m-d", $val) === false)
      return false;
    return true;
  }


  /////////////////
  //   STRINGS   //
  /////////////////
  /** Check if the provided value is only contains the provided chars.
    * All the strings must be in UTF-8
    * @param string $val The string to test
    * @param string $allowedChars The allowed chars
    */
  public function isAllowedChars ($val, $allowedChars)
  {
    return \verify::staticIsAllowedChars ($val, $allowedChars);
  }

  /** Check if the provided value is only contains the provided chars.
    * In static mode
    * All the strings must be in UTF-8
    * @param string $val The string to test
    * @param string $allowedChars The allowed chars
    */
  public function staticIsAllowedChars ($val, $allowedChars)
  {
    preg_match ('/^['.$allowedChars.']+/u', $val, $matches);
    if (isset ($matches[0]) &&
        mb_strlen ($matches[0]) === mb_strlen ($val))
      return true;
    return false;
  }

  /////////////////
  //   NUMBERS   //
  /////////////////
  /** Return true if the provided value is an integer in decimal (not octal)
    * @param string $val The Integer val to check
    */
  public function is_integer ($val)
  {
    return \verify::staticIs_integer ($val);
  }

  /** Return true if the provided value is an integer in decimal (not octal)
    * In static mode
    * @param string $val The Integer val to check
    */
  public static function staticIs_integer ($val)
  {
    if (! is_string ($val) && ! is_int ($val))
      return false;
    if (trim ($val) === "")
      return false;
    if (strspn ($val, "0123456789") !== strlen ($val))
      return false;
    return true;
  }

  ////////////////
  //   EMAILS   //
  ////////////////
  /** Return true if the provided value is a valid email address
    * @param string $val The value to check
    * @return boolean
    */
  public function is_email ($val)
  {
    return \verify::staticIs_email ($val);
  }

  /** Return true if the provided value is a valid email address in static mode
    * @param string $val The value to check
    * @return boolean
    */
  public static function staticIs_email ($val)
  {
    return !! filter_var ($val, FILTER_VALIDATE_EMAIL);
  }

  /////////////
  //   URL   //
  /////////////
  /** Return true if the provided value is a valid URL
    * @param string $val The value to check
    * @return boolean
    */
  public function is_URL ($val)
  {
    return \verify::staticIs_URL ($val);
  }

  /** Return true if the provided value is a valid URL in static mode
    * @param string $val The value to check
    * @return boolean
    */
  public static function staticIs_URL ($val)
  {
    return !! filter_var ($val, FILTER_VALIDATE_URL);
  }

  //////////////////
  ///   OTHERS   ///
  //////////////////
  /** Return true if the provided value is a valid UUID
    * %04x%04x-%04x-%04x-%04x-%04x%04x%04x
    * @param string $val The value to check
    * @return boolean
    */
  public function is_UUID ($val)
  {
    return \verify::staticIs_UUID ($val);
  }

  /** Return true if the provided value is a valid UUID in static mode
    * %04x%04x-%04x-%04x-%04x-%04x%04x%04x
    * @param string $val The value to check
    * @return boolean
    */
  public static function staticIs_UUID ($val)
  {
    if (! is_string ($val))
      return false;
    if (strlen ($val) !== 36)
      return false;
    if (strspn ($val, "0123456789abcdefABCDEF-") !== strlen ($val))
      return false;
    if ($val[8] !== "-" || $val[13] !== "-" || $val[18] !== "-" ||
        $val[23] !== "-")
      return false;
    return true;
  }

}