<?php
/**
 * Zend Framework
 *
 * LICENSE
 *
 * This source file is subject to the new BSD license that is bundled
 * with this package in the file LICENSE.txt.
 * It is also available through the world-wide-web at this URL:
 * http://framework.zend.com/license/new-bsd
 * 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@zend.com so we can send you a copy immediately.
 *
 * @category   Zend
 * @package    Zend_View
 * @subpackage Helper
 * @copyright  Copyright (c) 2005-2008 Zend Technologies USA Inc. (http://www.zend.com)
 * @license    http://framework.zend.com/license/new-bsd     New BSD License
 */


/**
 * Base helper for form elements.  Extend this, don't use it on its own.
 *
 * @category   Zend
 * @package    Zend_View
 * @subpackage Helper
 * @copyright  Copyright (c) 2005-2008 Zend Technologies USA Inc. (http://www.zend.com)
 * @license    http://framework.zend.com/license/new-bsd     New BSD License
 */
abstract class Zend_View_Helper_FormElement
{
    /**
     * @var Zend_View_Interface
     */
    public $view;

    /**
     * Converts an associative array to a string of tag attributes.
     *
     * @access public
     *
     * @param array $attribs From this array, each key-value pair is
     * converted to an attribute name and value.
     *
     * @return string The XHTML for the attributes.
     */
    protected function _htmlAttribs($attribs)
    {
        $xhtml = '';
        foreach ((array) $attribs as $key => $val) {
            $key = $this->view->escape($key);
            if (is_array($val)) {
                $val = implode(' ', $val);
            }
            $val = $this->view->escape($val);
            $xhtml .= " $key=\"$val\"";
        }
        return $xhtml;
    }

    /**
     * Converts parameter arguments to an element info array.
     *
     * E.g, formExample($name, $value, $attribs, $options, $listsep) is
     * the same thing as formExample(array('name' => ...)).
     *
     * Note that you cannot pass a 'disable' param; you need to pass
     * it as an 'attribs' key.
     *
     * @access protected
     *
     * @return array An element info array with keys for name, value,
     * attribs, options, listsep, disable, and escape.
     */
    protected function _getInfo($name, $value = null, $attribs = null,
        $options = null, $listsep = null)
    {
        // the baseline info.  note that $name serves a dual purpose;
        // if an array, it's an element info array that will override
        // these baseline values.  as such, ignore it for the 'name'
        // if it's an array.
        $info = array(
            'name'    => is_array($name) ? '' : $name,
            'id'      => is_array($name) ? '' : $name,
            'value'   => $value,
            'attribs' => $attribs,
            'options' => $options,
            'listsep' => $listsep,
            'disable' => false,
            'escape'  => true,
        );

        // override with named args
        if (is_array($name)) {
            // only set keys that are already in info
            foreach ($info as $key => $val) {
                if (isset($name[$key])) {
                    $info[$key] = $name[$key];
                }
            }
        }

        // force attribs to an array, per note from Orjan Persson.
        settype($info['attribs'], 'array');

        // Normalize readonly tag
        if (isset($info['attribs']['readonly']) 
            && $info['attribs']['readonly'] != 'readonly') 
        {
            $info['attribs']['readonly'] = 'readonly';
        }

        // Disable attribute
        if (isset($info['attribs']['disable']) 
            && is_scalar($info['attribs']['disable'])) 
        {
            // disable the element
            $info['disable'] = true;
            unset($info['attribs']['disable']);
        } elseif (isset($info['attribs']['disable'])
            && is_array($info['attribs']['disable']))
        {
            $info['disable'] = $info['attribs']['disable'];
            unset($info['attribs']['disable']);
        }

        // Set ID for element
        if (isset($info['attribs']['id'])) {
            $info['id'] = (string) $info['attribs']['id'];
        } elseif (!isset($info['attribs']['id']) && !empty($info['name'])) {
            $id = $info['name'];
            if (substr($id, -2) == '[]') {
                $id = substr($id, 0, strlen($id) - 2);
            }
            if (strstr($id, ']')) {
                $id = trim($id, ']');
                $id = str_replace('][', '-', $id);
                $id = str_replace('[', '-', $id);
            }
            $info['id'] = $id;
        }

        // Determine escaping from attributes
        if (isset($info['attribs']['escape'])) {
            $info['escape'] = (bool) $info['attribs']['escape'];
        }

        // Determine listsetp from attributes
        if (isset($info['attribs']['listsep'])) {
            $info['listsep'] = (string) $info['attribs']['listsep'];
        }

        // Remove attribs that might overwrite the other keys. We do this LAST 
        // because we needed the other attribs values earlier.
        foreach ($info as $key => $val) {
            if (isset($info['attribs'][$key])) {
                unset($info['attribs'][$key]);
            }
        }

        // done!
        return $info;
    }

    /**
     * Creates a hidden element.
     *
     * We have this as a common method because other elements often
     * need hidden elements for their operation.
     *
     * @access protected
     *
     * @param $name The element name.
     *
     * @param $value The element value.
     *
     * @param $attribs Attributes for the element.
     *
     * @return string A hidden element.
     */
    protected function _hidden($name, $value = null, $attribs = null)
    {
        return '<input type="hidden"'
             . ' name="' . $this->view->escape($name) . '"'
             . ' value="' . $this->view->escape($value) . '"'
             . $this->_htmlAttribs($attribs) . ' />';
    }

    /**
     * Set the view object
     *
     * @param Zend_View_Interface $view
     * @return void
     */
    public function setView(Zend_View_Interface $view)
    {
        $this->view = $view;
    }
}
