<?php
namespace TYPO3\CMS\Fluid\ViewHelpers\Form;

/*                                                                        *
 * This script is backported from the TYPO3 Flow package "TYPO3.Fluid".   *
 *                                                                        *
 * It is free software; you can redistribute it and/or modify it under    *
 * the terms of the GNU Lesser General Public License, either version 3   *
 *  of the License, or (at your option) any later version.                *
 *                                                                        *
 *                                                                        *
 * This script is distributed in the hope that it will be useful, but     *
 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHAN-    *
 * TABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser       *
 * General Public License for more details.                               *
 *                                                                        *
 * You should have received a copy of the GNU Lesser General Public       *
 * License along with the script.                                         *
 * If not, see http://www.gnu.org/licenses/lgpl.html                      *
 *                                                                        *
 * The TYPO3 project - inspiring people to share!                         *
 *                                                                        */
/**
 * A view helper which generates an <input type="file"> HTML element.
 * Make sure to set enctype="multipart/form-data" on the form!
 *
 * = Examples =
 *
 * <code title="Example">
 * <f:form.upload name="file" />
 * </code>
 * <output>
 * <input type="file" name="file" />
 * </output>
 *
 * @api
 */
class UploadViewHelper extends \TYPO3\CMS\Fluid\ViewHelpers\Form\AbstractFormFieldViewHelper {

	/**
	 * @var string
	 */
	protected $tagName = 'input';

	/**
	 * Initialize the arguments.
	 *
	 * @return void
	 * @api
	 */
	public function initializeArguments() {
		parent::initializeArguments();
		$this->registerTagAttribute('disabled', 'string', 'Specifies that the input element should be disabled when the page loads');
		$this->registerArgument('errorClass', 'string', 'CSS class to set if there are errors for this view helper', FALSE, 'f3-form-error');
		$this->registerUniversalTagAttributes();
	}

	/**
	 * Renders the upload field.
	 *
	 * @return string
	 * @api
	 */
	public function render() {
		$name = $this->getName();
		$allowedFields = array('name', 'type', 'tmp_name', 'error', 'size');
		foreach ($allowedFields as $fieldName) {
			$this->registerFieldNameForFormTokenGeneration($name . '[' . $fieldName . ']');
		}
		$this->tag->addAttribute('type', 'file');
		$this->tag->addAttribute('name', $name);
		$this->setErrorClassAttribute();
		return $this->tag->render();
	}
}
