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<?php
/**
 * text version of Captcha element
 * Xoops Frameworks addon
 *
 * based on Frameworks::captcha by Taiwen Jiang (phppp or D.J.) <php_pp@hotmail.com>
 *
 * @copyright   The XOOPS project http://www.xoops.org/
 * @license     http://www.fsf.org/copyleft/gpl.html GNU public license
 * @author      Taiwen Jiang (phppp or D.J.) <php_pp@hotmail.com>
 * @since       XOOPS
 *
 * @category    ICMS
 * @package     Form
 * @subpackage  Elements
 * @author      Taiwen Jiang (phppp or D.J.) <php_pp@hotmail.com>
 * @version     SVN: $Id: Text.php 12340 2013-09-22 04:11:09Z skenow $
 */

/**
 * Creates text version of Captcha element
 *
 * @author      modified by Sina Asghari (aka stranger) <pesian_stranger@users.sourceforge.net>
 * @category    ICMS
 * @package     Form
 * @subpackage  Elements
 */
class icms_form_elements_captcha_Text {

    public $config = array();
    public $code;

    /**
     * Constructor
     */
    public function __construct() {
    }

    /**
     * Creates icms_form_elements_captcha_Text object
     * @return object   reference to icms_form_elements_captcha_Text (@link icms_form_elements_captcha_Text) Object
     */
    public function &instance() {
        static $instance;
        if (!isset($instance)) {
            $instance = new self();
        }
        return $instance;
    }

    /**
     * Loading configs from CAPTCHA class
     * @param string    $config the config array
     */
    public function loadConfig($config = array()) {
        // Loading default preferences
        $this->config =& $config;
    }

    /**
     * Sets CAPTCHA code
     */
    public function setCode() {
        $_SESSION['icms_form_elements_captcha_Object_sessioncode'] = strval($this->code);
    }

    /**
     * Render the form
     * @return string   $form the Captcha Form
     */
    public function render() {
        global $icmsConfigCaptcha;
        $form = $this->loadText()
            . "&nbsp;&nbsp; <input type='text' name='" . $this->config["name"]
            ."' id='" . $this->config["name"]
            . "' size='" . $icmsConfigCaptcha['captcha_num_chars']
            . "' maxlength='" . $icmsConfigCaptcha['captcha_num_chars']
            . "' value='' />";
        $rule = constant("ICMS_CAPTCHA_RULE_TEXT");
        if (!empty($rule)) {
            $form .= "&nbsp;&nbsp;<small>{$rule}</small>";
        }

        $this->setCode();

        return $form;
    }

    /**
     * Load the ICMS Captcha Text
     * @return string   The Captcha Expression
     */
    public function loadText() {
        $val_a = rand(0, 9);
        $val_b = rand(0, 9);
        if ($val_a > $val_b) {
            $expression = "{$val_a} - {$val_b} = ?";
            $this->code = $val_a - $val_b;
        } else {
            $expression = "{$val_a} + {$val_b} = ?";
            $this->code = $val_a + $val_b;
        }

        return "<span style='font-style: normal; font-weight: bold; font-size: 100%; font-color: #333; border: 1px solid #333; padding: 1px 5px;'>{$expression}</span>";
    }

}