<?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) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)
 * @license    http://framework.zend.com/license/new-bsd     New BSD License
 * @version    $Id$
 */

/**
 * @see Zend_View_Helper_Navigation_HelperAbstract
 */
#require_once 'Zend/View/Helper/Navigation/HelperAbstract.php';

/**
 * Helper for rendering menus from navigation containers
 *
 * @category   Zend
 * @package    Zend_View
 * @subpackage Helper
 * @copyright  Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)
 * @license    http://framework.zend.com/license/new-bsd     New BSD License
 */
class Zend_View_Helper_Navigation_Menu
    extends Zend_View_Helper_Navigation_HelperAbstract
{
    /**
     * CSS class to use for the ul element
     *
     * @var string
     */
    protected $_ulClass = 'navigation';

    /**
     * Whether only active branch should be rendered
     *
     * @var bool
     */
    protected $_onlyActiveBranch = false;

    /**
     * Whether parents should be rendered when only rendering active branch
     *
     * @var bool
     */
    protected $_renderParents = true;

    /**
     * Partial view script to use for rendering menu
     *
     * @var string|array
     */
    protected $_partial = null;

    /**
     * View helper entry point:
     * Retrieves helper and optionally sets container to operate on
     *
     * @param  Zend_Navigation_Container $container  [optional] container to
     *                                               operate on
     * @return Zend_View_Helper_Navigation_Menu      fluent interface,
     *                                               returns self
     */
    public function menu(Zend_Navigation_Container $container = null)
    {
        if (null !== $container) {
            $this->setContainer($container);
        }

        return $this;
    }

    // Accessors:

    /**
     * Sets CSS class to use for the first 'ul' element when rendering
     *
     * @param  string $ulClass                   CSS class to set
     * @return Zend_View_Helper_Navigation_Menu  fluent interface, returns self
     */
    public function setUlClass($ulClass)
    {
        if (is_string($ulClass)) {
            $this->_ulClass = $ulClass;
        }

        return $this;
    }

    /**
     * Returns CSS class to use for the first 'ul' element when rendering
     *
     * @return string  CSS class
     */
    public function getUlClass()
    {
        return $this->_ulClass;
    }

    /**
     * Sets a flag indicating whether only active branch should be rendered
     *
     * @param  bool $flag                        [optional] render only active
     *                                           branch. Default is true.
     * @return Zend_View_Helper_Navigation_Menu  fluent interface, returns self
     */
    public function setOnlyActiveBranch($flag = true)
    {
        $this->_onlyActiveBranch = (bool) $flag;
        return $this;
    }

    /**
     * Returns a flag indicating whether only active branch should be rendered
     *
     * By default, this value is false, meaning the entire menu will be
     * be rendered.
     *
     * @return bool  whether only active branch should be rendered
     */
    public function getOnlyActiveBranch()
    {
        return $this->_onlyActiveBranch;
    }

    /**
     * Enables/disables rendering of parents when only rendering active branch
     *
     * See {@link setOnlyActiveBranch()} for more information.
     *
     * @param  bool $flag                        [optional] render parents when
     *                                           rendering active branch.
     *                                           Default is true.
     * @return Zend_View_Helper_Navigation_Menu  fluent interface, returns self
     */
    public function setRenderParents($flag = true)
    {
        $this->_renderParents = (bool) $flag;
        return $this;
    }

    /**
     * Returns flag indicating whether parents should be rendered when rendering
     * only the active branch
     *
     * By default, this value is true.
     *
     * @return bool  whether parents should be rendered
     */
    public function getRenderParents()
    {
        return $this->_renderParents;
    }

    /**
     * Sets which partial view script to use for rendering menu
     *
     * @param  string|array $partial             partial view script or null. If
     *                                           an array is given, it is
     *                                           expected to contain two values;
     *                                           the partial view script to use,
     *                                           and the module where the script
     *                                           can be found.
     * @return Zend_View_Helper_Navigation_Menu  fluent interface, returns self
     */
    public function setPartial($partial)
    {
        if (null === $partial || is_string($partial) || is_array($partial)) {
            $this->_partial = $partial;
        }

        return $this;
    }

    /**
     * Returns partial view script to use for rendering menu
     *
     * @return string|array|null
     */
    public function getPartial()
    {
        return $this->_partial;
    }

    // Public methods:

    /**
     * Returns an HTML string containing an 'a' element for the given page if
     * the page's href is not empty, and a 'span' element if it is empty
     *
     * Overrides {@link Zend_View_Helper_Navigation_Abstract::htmlify()}.
     *
     * @param  Zend_Navigation_Page $page  page to generate HTML for
     * @return string                      HTML string for the given page
     */
    public function htmlify(Zend_Navigation_Page $page)
    {
        // get label and title for translating
        $label = $page->getLabel();
        $title = $page->getTitle();

        // translate label and title?
        if ($this->getUseTranslator() && $t = $this->getTranslator()) {
            if (is_string($label) && !empty($label)) {
                $label = $t->translate($label);
            }
            if (is_string($title) && !empty($title)) {
                $title = $t->translate($title);
            }
        }

        // get attribs for element
        $attribs = array(
            'id'     => $page->getId(),
            'title'  => $title,
            'class'  => $page->getClass()
        );

        // does page have a href?
        if ($href = $page->getHref()) {
            $element = 'a';
            $attribs['href'] = $href;
            $attribs['target'] = $page->getTarget();
        } else {
            $element = 'span';
        }

        return '<' . $element . $this->_htmlAttribs($attribs) . '>'
             . $this->view->escape($label)
             . '</' . $element . '>';
    }

    /**
     * Normalizes given render options
     *
     * @param  array $options  [optional] options to normalize
     * @return array           normalized options
     */
    protected function _normalizeOptions(array $options = array())
    {
        if (isset($options['indent'])) {
            $options['indent'] = $this->_getWhitespace($options['indent']);
        } else {
            $options['indent'] = $this->getIndent();
        }

        if (isset($options['ulClass']) && $options['ulClass'] !== null) {
            $options['ulClass'] = (string) $options['ulClass'];
        } else {
            $options['ulClass'] = $this->getUlClass();
        }

        if (array_key_exists('minDepth', $options)) {
            if (null !== $options['minDepth']) {
                $options['minDepth'] = (int) $options['minDepth'];
            }
        } else {
            $options['minDepth'] = $this->getMinDepth();
        }

        if ($options['minDepth'] < 0 || $options['minDepth'] === null) {
            $options['minDepth'] = 0;
        }

        if (array_key_exists('maxDepth', $options)) {
            if (null !== $options['maxDepth']) {
                $options['maxDepth'] = (int) $options['maxDepth'];
            }
        } else {
            $options['maxDepth'] = $this->getMaxDepth();
        }

        if (!isset($options['onlyActiveBranch'])) {
            $options['onlyActiveBranch'] = $this->getOnlyActiveBranch();
        }

        if (!isset($options['renderParents'])) {
            $options['renderParents'] = $this->getRenderParents();
        }

        return $options;
    }

    // Render methods:

    /**
     * Renders the deepest active menu within [$minDepth, $maxDeth], (called
     * from {@link renderMenu()})
     *
     * @param  Zend_Navigation_Container $container  container to render
     * @param  array                     $active     active page and depth
     * @param  string                    $ulClass    CSS class for first UL
     * @param  string                    $indent     initial indentation
     * @param  int|null                  $minDepth   minimum depth
     * @param  int|null                  $maxDepth   maximum depth
     * @return string                                rendered menu
     */
    protected function _renderDeepestMenu(Zend_Navigation_Container $container,
                                          $ulClass,
                                          $indent,
                                          $minDepth,
                                          $maxDepth)
    {
        if (!$active = $this->findActive($container, $minDepth - 1, $maxDepth)) {
            return '';
        }

        // special case if active page is one below minDepth
        if ($active['depth'] < $minDepth) {
            if (!$active['page']->hasPages()) {
                return '';
            }
        } else if (!$active['page']->hasPages()) {
            // found pages has no children; render siblings
            $active['page'] = $active['page']->getParent();
        } else if (is_int($maxDepth) && $active['depth'] +1 > $maxDepth) {
            // children are below max depth; render siblings
            $active['page'] = $active['page']->getParent();
        }

        $ulClass = $ulClass ? ' class="' . $ulClass . '"' : '';
        $html = $indent . '<ul' . $ulClass . '>' . self::EOL;

        foreach ($active['page'] as $subPage) {
            if (!$this->accept($subPage)) {
                continue;
            }
            $liClass = $subPage->isActive(true) ? ' class="active"' : '';
            $html .= $indent . '    <li' . $liClass . '>' . self::EOL;
            $html .= $indent . '        ' . $this->htmlify($subPage) . self::EOL;
            $html .= $indent . '    </li>' . self::EOL;
        }

        $html .= $indent . '</ul>';

        return $html;
    }

    /**
     * Renders a normal menu (called from {@link renderMenu()})
     *
     * @param  Zend_Navigation_Container $container   container to render
     * @param  string                    $ulClass     CSS class for first UL
     * @param  string                    $indent      initial indentation
     * @param  int|null                  $minDepth    minimum depth
     * @param  int|null                  $maxDepth    maximum depth
     * @param  bool                      $onlyActive  render only active branch?
     * @return string
     */
    protected function _renderMenu(Zend_Navigation_Container $container,
                                   $ulClass,
                                   $indent,
                                   $minDepth,
                                   $maxDepth,
                                   $onlyActive)
    {
        $html = '';

        // find deepest active
        if ($found = $this->findActive($container, $minDepth, $maxDepth)) {
            $foundPage = $found['page'];
            $foundDepth = $found['depth'];
        } else {
            $foundPage = null;
        }

        // create iterator
        $iterator = new RecursiveIteratorIterator($container,
                            RecursiveIteratorIterator::SELF_FIRST);
        if (is_int($maxDepth)) {
            $iterator->setMaxDepth($maxDepth);
        }

        // iterate container
        $prevDepth = -1;
        foreach ($iterator as $page) {
            $depth = $iterator->getDepth();
            $isActive = $page->isActive(true);
            if ($depth < $minDepth || !$this->accept($page)) {
                // page is below minDepth or not accepted by acl/visibilty
                continue;
            } else if ($onlyActive && !$isActive) {
                // page is not active itself, but might be in the active branch
                $accept = false;
                if ($foundPage) {
                    if ($foundPage->hasPage($page)) {
                        // accept if page is a direct child of the active page
                        $accept = true;
                    } else if ($foundPage->getParent()->hasPage($page)) {
                        // page is a sibling of the active page...
                        if (!$foundPage->hasPages() ||
                            is_int($maxDepth) && $foundDepth + 1 > $maxDepth) {
                            // accept if active page has no children, or the
                            // children are too deep to be rendered
                            $accept = true;
                        }
                    }
                }

                if (!$accept) {
                    continue;
                }
            }

            // make sure indentation is correct
            $depth -= $minDepth;
            $myIndent = $indent . str_repeat('        ', $depth);

            if ($depth > $prevDepth) {
                // start new ul tag
                if ($ulClass && $depth ==  0) {
                    $ulClass = ' class="' . $ulClass . '"';
                } else {
                    $ulClass = '';
                }
                $html .= $myIndent . '<ul' . $ulClass . '>' . self::EOL;
            } else if ($prevDepth > $depth) {
                // close li/ul tags until we're at current depth
                for ($i = $prevDepth; $i > $depth; $i--) {
                    $ind = $indent . str_repeat('        ', $i);
                    $html .= $ind . '    </li>' . self::EOL;
                    $html .= $ind . '</ul>' . self::EOL;
                }
                // close previous li tag
                $html .= $myIndent . '    </li>' . self::EOL;
            } else {
                // close previous li tag
                $html .= $myIndent . '    </li>' . self::EOL;
            }

            // render li tag and page
            $liClass = $isActive ? ' class="active"' : '';
            $html .= $myIndent . '    <li' . $liClass . '>' . self::EOL
                   . $myIndent . '        ' . $this->htmlify($page) . self::EOL;

            // store as previous depth for next iteration
            $prevDepth = $depth;
        }

        if ($html) {
            // done iterating container; close open ul/li tags
            for ($i = $prevDepth+1; $i > 0; $i--) {
                $myIndent = $indent . str_repeat('        ', $i-1);
                $html .= $myIndent . '    </li>' . self::EOL
                       . $myIndent . '</ul>' . self::EOL;
            }
            $html = rtrim($html, self::EOL);
        }

        return $html;
    }

    /**
     * Renders helper
     *
     * Renders a HTML 'ul' for the given $container. If $container is not given,
     * the container registered in the helper will be used.
     *
     * Available $options:
     *
     *
     * @param  Zend_Navigation_Container $container  [optional] container to
     *                                               create menu from. Default
     *                                               is to use the container
     *                                               retrieved from
     *                                               {@link getContainer()}.
     * @param  array                     $options    [optional] options for
     *                                               controlling rendering
     * @return string                                rendered menu
     */
    public function renderMenu(Zend_Navigation_Container $container = null,
                               array $options = array())
    {
        if (null === $container) {
            $container = $this->getContainer();
        }

        $options = $this->_normalizeOptions($options);

        if ($options['onlyActiveBranch'] && !$options['renderParents']) {
            $html = $this->_renderDeepestMenu($container,
                                              $options['ulClass'],
                                              $options['indent'],
                                              $options['minDepth'],
                                              $options['maxDepth']);
        } else {
            $html = $this->_renderMenu($container,
                                       $options['ulClass'],
                                       $options['indent'],
                                       $options['minDepth'],
                                       $options['maxDepth'],
                                       $options['onlyActiveBranch']);
        }

        return $html;
    }

    /**
     * Renders the inner-most sub menu for the active page in the $container
     *
     * This is a convenience method which is equivalent to the following call:
     * <code>
     * renderMenu($container, array(
     *     'indent'           => $indent,
     *     'ulClass'          => $ulClass,
     *     'minDepth'         => null,
     *     'maxDepth'         => null,
     *     'onlyActiveBranch' => true,
     *     'renderParents'    => false
     * ));
     * </code>
     *
     * @param  Zend_Navigation_Container $container  [optional] container to
     *                                               render. Default is to render
     *                                               the container registered in
     *                                               the helper.
     * @param  string                    $ulClass    [optional] CSS class to
     *                                               use for UL element. Default
     *                                               is to use the value from
     *                                               {@link getUlClass()}.
     * @param  string|int                $indent     [optional] indentation as
     *                                               a string or number of
     *                                               spaces. Default is to use
     *                                               the value retrieved from
     *                                               {@link getIndent()}.
     * @return string                                rendered content
     */
    public function renderSubMenu(Zend_Navigation_Container $container = null,
                                  $ulClass = null,
                                  $indent = null)
    {
        return $this->renderMenu($container, array(
            'indent'           => $indent,
            'ulClass'          => $ulClass,
            'minDepth'         => null,
            'maxDepth'         => null,
            'onlyActiveBranch' => true,
            'renderParents'    => false
        ));
    }

    /**
     * Renders the given $container by invoking the partial view helper
     *
     * The container will simply be passed on as a model to the view script
     * as-is, and will be available in the partial script as 'container', e.g.
     * <code>echo 'Number of pages: ', count($this->container);</code>.
     *
     * @param  Zend_Navigation_Container $container  [optional] container to
     *                                               pass to view script. Default
     *                                               is to use the container
     *                                               registered in the helper.
     * @param  string|array             $partial     [optional] partial view
     *                                               script to use. Default is to
     *                                               use the partial registered
     *                                               in the helper. If an array
     *                                               is given, it is expected to
     *                                               contain two values; the
     *                                               partial view script to use,
     *                                               and the module where the
     *                                               script can be found.
     * @return string                                helper output
     */
    public function renderPartial(Zend_Navigation_Container $container = null,
                                  $partial = null)
    {
        if (null === $container) {
            $container = $this->getContainer();
        }

        if (null === $partial) {
            $partial = $this->getPartial();
        }

        if (empty($partial)) {
            #require_once 'Zend/View/Exception.php';
            $e = new Zend_View_Exception(
                'Unable to render menu: No partial view script provided'
            );
            $e->setView($this->view);
            throw $e;
        }

        $model = array(
            'container' => $container
        );

        if (is_array($partial)) {
            if (count($partial) != 2) {
                #require_once 'Zend/View/Exception.php';
                $e = new Zend_View_Exception(
                    'Unable to render menu: A view partial supplied as ' 
                    .  'an array must contain two values: partial view ' 
                    .  'script and module where script can be found'
                );
                $e->setView($this->view);
                throw $e;
            }

            return $this->view->partial($partial[0], $partial[1], $model);
        }

        return $this->view->partial($partial, null, $model);
    }

    // Zend_View_Helper_Navigation_Helper:

    /**
     * Renders menu
     *
     * Implements {@link Zend_View_Helper_Navigation_Helper::render()}.
     *
     * If a partial view is registered in the helper, the menu will be rendered
     * using the given partial script. If no partial is registered, the menu
     * will be rendered as an 'ul' element by the helper's internal method.
     *
     * @see renderPartial()
     * @see renderMenu()
     *
     * @param  Zend_Navigation_Container $container  [optional] container to
     *                                               render. Default is to
     *                                               render the container
     *                                               registered in the helper.
     * @return string                                helper output
     */
    public function render(Zend_Navigation_Container $container = null)
    {
        if ($partial = $this->getPartial()) {
            return $this->renderPartial($container, $partial);
        } else {
            return $this->renderMenu($container);
        }
    }
}