<?php
/**
 * CAPTCHA for text mode
 *
 * You may not change or alter any portion of this comment or credits
 * of supporting developers from this source code or any supporting source code
 * which is considered copyrighted (c) material of the original comment or credit authors.
 * 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.
 *
 * @copyright       (c) 2000-2016 XOOPS Project (www.xoops.org)
 * @license             GNU GPL 2 (https://www.gnu.org/licenses/gpl-2.0.html)
 * @package             class
 * @subpackage          CAPTCHA
 * @since               2.3.0
 * @author              Taiwen Jiang <phppp@users.sourceforge.net>
 */
defined('XOOPS_ROOT_PATH') || exit('Restricted access');

/**
 * Class XoopsCaptchaText
 */
class XoopsCaptchaText extends XoopsCaptchaMethod
{

    /** @var string  */
    protected $outputText = '';
    /**
     * XoopsCaptchaMethod::__construct()
     *
     * @param mixed $handler
     */
    public function __construct($handler = null)
    {
        parent::__construct($handler);
        $this->buildQuestion();
    }

    /**
     * XoopsCaptchaText::render()
     *
     * @return string|void
     */
    public function render()
    {
        $form = $this->loadText() . '&nbsp;&nbsp; <input type="text" name="' . $this->config['name'] . '" id="' . $this->config['name'] . '" size="' . $this->config['num_chars'] . '" maxlength="' . $this->config['num_chars'] . '" value="" />';
        $form .= '<br>' . _CAPTCHA_RULE_TEXT;
        if (!empty($this->config['maxattempts'])) {
            $form .= '<br>' . sprintf(_CAPTCHA_MAXATTEMPTS, $this->config['maxattempts']);
        }

        return $form;
    }

    /**
     * XoopsCaptchaText::loadText()
     *
     * @return string
     */
    public function loadText()
    {
        return '<span class="captchatext">' . $this->outputText . '</span>';
    }

    protected function buildQuestion()
    {
        $val_a = mt_rand(0, 9);
        $val_b = mt_rand(0, 9);
        if ($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;
        }

        $this->outputText = $expression;
    }
}
