<?php

/**
 * @file
 * Creates a editmenu.
 */

/**
 * Implements hook_menu().
 */
function editmenu_menu() {
  $items = array();

  $items['admin/config/user-interface/editmenu'] = array(
    'title' => 'EditMenu',
    'description' => 'Select the menu to display.',
    'page callback' => 'drupal_get_form',
    'page arguments' => array('editmenu_admin_settings'),
    'access arguments' => array('administer editmenu'),
    'file' => 'editmenu.admin.inc',
    'type' => MENU_NORMAL_ITEM,
  );

  return $items;
}

/**
 * Is editmenu enabled for this page request?
 */
function editmenu_enabled() {
  $enabled = &drupal_static(__FUNCTION__);

  if (!isset($enabled)) {
    global $theme;
    
    $is_overlay = FALSE;
    if (function_exists('overlay_get_mode')) {
      $is_overlay = (overlay_get_mode() == 'child') ? TRUE : FALSE;
    }
    
    $exclusions = variable_get('editmenu_exclusions', array());
    $enabled = (!isset($exclusions[$theme]) || !$exclusions[$theme])
      && user_access('view editmenu')
      && _editmenu_page_visibility()
      && _editmenu_superuser_active()
      && !$is_overlay;
  }

  return $enabled;
}

/**
 * Implements hook_init().
 */
function editmenu_init() {
  // do a simple access check here, since theme isn't available to check yet
  if (editmenu_enabled()) {
    _editmenu_add_menu();
    _editmenu_add_css();    // basic CSS must be before _editmenu_add_theme()
    _editmenu_add_theme();
    _editmenu_add_js();
  }
}

/** \brief Add the editmenu variable with the menu to be displayed.
 *
 * This function loads the menu to be displayed and transforms it so
 * it works with superfish.
 *
 * If the cache version of the editmenu JavaScript string cannot be
 * created, then it is sent inline whether or not the user asked for it
 * to be sent inline.
 */
function _editmenu_add_menu() {
  // XXX -- should we put that in the settings instead? why put it in its own variable?
  $editmenu = 'var editmenu=' . drupal_json_encode(editmenu_get_menu()) . ';';

  $has_file = variable_get('editmenu_cache_menu', TRUE);
  if ($has_file) {
    $js_hash = drupal_hash_base64($editmenu);
    $js_path = 'public://js'; // same path as concatenated Core JS
    $js_filename = $js_path . '/editmenu_' . $js_hash . '.js';
    if (!file_exists($js_filename)) {
      file_prepare_directory($js_path, FILE_CREATE_DIRECTORY);
      if (!file_unmanaged_save_data($editmenu, $js_filename, FILE_EXISTS_REPLACE)) {
        $has_file = FALSE;
      }
    }
  }

  $options = array(
    'scope' => variable_get('editmenu_menu_scope', 'footer'),
    // 'version' => ?, -- could we make use of the version?
  );
  if ($has_file) {
    //$options['type'] = 'file'; -- default
    drupal_add_js($js_filename, $options);
  }
  else {
    // inline adds the value as is (untouched)
    $options['type'] = 'inline';
    drupal_add_js($editmenu, $options);
  }
}

/** \brief Generate the CSS and add it to the page.
 *
 * This function generates the dynamic CSS and then insert that to
 * the header of the page.
 *
 * The function regenerates the CSS only when the settings were
 * modified. Otherwise, it uses the cached version.
 *
 * The function has a fall back, in case the dynamic CSS cannot
 * be created.
 */
function _editmenu_add_css() {
  global $user;

  $editmenu_path = drupal_get_path('module', 'editmenu');
  $css_path = 'public://css'; // same path as concatenated Core CSS
  if (file_prepare_directory($css_path, FILE_CREATE_DIRECTORY | FILE_MODIFY_PERMISSIONS)) {
    $fix = variable_get('editmenu_fix', 'scroll');

    // XXX add a variable editmenu_update which is set to TRUE whenever
    //     the settings get modified and false here
    $output_filename = variable_get('editmenu_css_filename', '');
    if (!$output_filename) {
      $tags = array(
        '@MENUBAR_ZINDEX@' => simplemnu_get_zindex('editmenu_menubar_zindex', 9999),
        '@DROPDOWN_ZINDEX@' => simplemnu_get_zindex('editmenu_dropdown_zindex', 9999),
      );
      switch ($fix) {
      case 'top':
        $tags['@FIX@'] = "position: fixed;\n  top: 0; left: 0;";
        break;

      case 'bottom':
        $tags['@FIX@'] = "position: fixed;\n  bottom: 0; left: 0;";
        break;

      default: // scroll
        $tags['@FIX@'] = 'position: relative;';
        break;

      }
      $css = file_get_contents($editmenu_path . '/editmenu.css.tpl');
      $css = strtr($css, $tags);
      $css_hash = hash('sha256', $css);
      $output_filename = $css_path . '/editmenu-' . $css_hash . '.css';
      if (!file_exists($output_filename)) {
        // new content, create a new file
        file_put_contents($output_filename, $css);
      }
      else {
        // this call is rather ugly, but we must make sure that the
        // system cache will take the current Editmenu CSS in account
        _drupal_flush_css_js();
      }
      //variable_set('editmenu_css_filename', $output_filename);
    }
    drupal_add_css($output_filename);
  }
  else {
    // in case we cannot create the dynamic CSS
    $last_msg = variable_get('editmenu_css_error', 0);
    if (($last_msg != -1 && $last_msg + 3600 > time()) || $user->uid == 1) {
      // avoid displaying the error on each page... only once per hour.
      // (unless you are the admin, in which case you probably want to know!)
      variable_set('editmenu_css_error', time());
      drupal_set_message(t('Editmenu could not create the folder @path in order to save the dynamic CSS data.',
        array('@path' => $css_path)), 'warning');
    }

    // use a default that cannot react to the dynamic changes...
    drupal_add_css($editmenu_path .'/editmenu.css');
  }
}

/** \brief Add the module theme.
 *
 * This function adds a theme for the Editmenu look.
 *
 * By default, the original theme is used. The module also offers the
 * blackblue theme. It is also possible to create new themes or use
 * the theming of the current theme for editmenu (so the menu fits
 * perfectly for that theme.)
 */
function _editmenu_add_theme() {
  // we want to put the editmenu theme CSS first
  // so we can change some CSS entries dynamically
  // but at this time the editmenu.css is used to
  // reset many of the CSS entries... Hmmm...
  $editmenu_theme = variable_get('editmenu_theme', 'original');
  if ($editmenu_theme != 'custom') {
    $editmenu_path = drupal_get_path('module', 'editmenu');
    $theme_file = $editmenu_path . '/themes/' . $editmenu_theme
                                  . '/' . $editmenu_theme . '.css';
    if (is_file($theme_file)) {
      drupal_add_css($theme_file);
    }
  }
}

/** \brief Add the JavaScript that makes it all work.
 *
 * This function adds the Editmenu JavaScript, the Superfish JavaScript
 * and settings from the user.
 */
function _editmenu_add_js() {
  $editmenu_path = drupal_get_path('module', 'editmenu');

  // Settings
  $fix = variable_get('editmenu_fix', 'scroll');
  switch ($fix) {
  case 'top':
    $element = 'body';
    $placement = 'prepend';
    break;

  case 'bottom':
    $element = 'body';
    $placement = 'append';
    break;

  default: // 'scroll'
    // let user defined other elements when not fixed
    $element = variable_get('editmenu_element', 'body');
    $placement = variable_get('editmenu_element_method', 'prepend');
    break;

  }
  $settings = array(
    'effect' => variable_get('editmenu_effect', 'opacity'),
    'effectSpeed' => variable_get('editmenu_effect_speed', 'fast'),
    'element' => $element,
    'placement' => $placement,
    'hideDelay' => variable_get('editmenu_hide_delay', 800),
    'detectPopup' => variable_get('editmenu_detect_popup', 1),
  );
  drupal_add_js(array('editmenu' => $settings), array('type' => 'setting'));

  // Editmenu
  drupal_add_js($editmenu_path . '/editmenu.js', array('version' => '1.2'));

  // Superfish
  $superfish = variable_get('editmenu_superfish_version', 'superfish-1.4.1.js');
  if ($superfish != 'custom') {
    $sf_version = str_replace(array('superfish-', '.js'), '', $superfish);
    drupal_add_js($editmenu_path . '/' . $superfish, array('version' => $sf_version));
  }
}

/**
 * \brief Retrieve the zindex for the CSS files.
 *
 * This function retrieves a z-index from a Drupal variable and
 * transform it to fit in a CSS file.
 *
 * \param[in] $name The name of the z-index variable to read.
 * \param[in] $default The default value to use when the variable is not defined.
 *
 * \return A string representing the current value of the specified z-index.
 */
function simplemnu_get_zindex($name, $default) {
  $zindex = variable_get($name, $default);

  if ($zindex == -1) {
    $zindex = '';
  }
  else {
    $zindex = 'z-index: ' . $zindex . ';';
  }

  return $zindex;
}

/**
 * Implements hook_permission().
 */
function editmenu_permission() {
  return array(
    'view editmenu' => array(
      'title' => t('View EditMenu'),
      'description' => t('Display EditMenu to this user.'),
    ),
    'administer editmenu' => array(
      'title' => t('Administer EditMenu'),
      'description' => t('Change settings of EditMenu.'),
    ),
  );
}

/**
 * Render an HTML list of links for a given menu.
 */
function editmenu_get_menu() {
  variable_set('editmenu_running', TRUE);

  // if a user turned off menu module but EditMenu was previously set
  // reset variable so a menu appears
  $all_menus = array(variable_get('editmenu_menu', 'management:0'));
  drupal_alter('editmenu_menus', $all_menus);

  if (count($all_menus) > 1) {
    // if menu is not enable then we cannot have a count other than 1
    $menu_titles = menu_get_menus();
    $tree = array();
    foreach ($all_menus as $full_name) {
      list($menu_name, $mlid) = explode(':', $full_name);
      $tree[] = array(
        'link' => array(
          'editmenu_multi_menu_root' => TRUE,
          'mlid' => $mlid,
          'menu_name' => $full_name,
          'hidden' => FALSE,
          'title' => $menu_titles[$menu_name],
          'href' => 'admin/settings/editmenu', /// ??? -- we should not have a link here
          'in_active_trail' => FALSE,
          'has_children' => TRUE,
          'localized_options' => array(
            'attributes' => array('class' => 'editmenu-top-level'),
          ),
        ),
        'below' => editmenu_menu_tree($full_name),
      );
    }
  }
  else {
    reset($all_menus);
    $tree = editmenu_menu_tree(current($all_menus));
  }

  // allow other modules to modify the menu tree
  drupal_alter('editmenu_tree', $tree);
  $tree = editmenu_tree_remove_hidden($tree);

  // now generate the output
  $menu_form = menu_tree_output($tree);
  $menu = drupal_render($menu_form);
  if (!$menu) {
    $menu = '<ul class="menu"><li><a href="' . url('admin/settings/editmenu') . '">'
        . t('No menu items found. Try a different menu as the default.') . '</a></li></ul>';
  }

  // add the id to the UL tag here instead of the JavaScript
  // otherwise it could be added to the <div> tag instead...
  $pos = strpos($menu, '>');
  $menu = str_replace('class="menu', 'class="menu clear-block', substr($menu, 0, $pos))
        . ' id="editmenu"' . substr($menu, $pos);

  variable_set('editmenu_running', FALSE);
  return '<div class="editmenu-block">' . $menu . '&nbsp;</div>';
}

/**
 * At this point (May 31, 2010) the menu tree includes
 * many 'below' that should be considered empty but
 * aren't... unless we make sure we remove the children
 * ourselves.
 */
function editmenu_tree_remove_hidden($tree) {
  $clean = array();

  foreach ($tree as $key => $data) {
    if (!$data['link']['hidden']) {
      if ($data['below']) {
        $data['below'] = editmenu_tree_remove_hidden($data['below']);
        if (count($data['below']) == 0) {
          $data['below'] = 0;
        }
      }
      $clean[] = $data;
    }
  }

  return $clean;
}

/**
 * Custom implementation of menu_tree().
 * We want to retrieve the entire menu structure for a given menu,
 * regardless of whether or not the menu item is expanded or not.
 */
function editmenu_menu_tree($menu_name = 'management:0') {
  $menu_tree = &drupal_static(__FUNCTION__, array());

  // until we take $mlid in account, we can use $mname
  // for the rest of the function
  list($mname, $mlid) = explode(':', $menu_name);

  if (!isset($menu_tree[$mname])) {
    $menu_tree[$mname] = menu_tree_all_data($mname);
  }
  return $menu_tree[$mname];
}

/**
 * Modified menu_tree_all_data(), providing the complete menu tree below $root_menu
 * (which can be *any* menu item, not just the root of a custom menu).
 *
 * @param $root_menu
 *   root menu item of the tree to return as "menu_name:mlid" (mlid = menu link id)
 *
 * @todo we don't actually need $menu_name, $mlid would be sufficient
 */
function editmenu_tree_all_data($root_menu = 'management:0') {
  $tree = &drupal_static(__FUNCTION__, array());

  list($menu_name, $mlid) = explode(':', $root_menu);

  // Generate the cache ID for Drupal 7.
  $max_depth = NULL;
  $cid = 'links:' . $menu_name . ':all:' . $mlid . ':' . $GLOBALS['language']->language . ':' . (int) $max_depth;

  if (!isset($tree[$cid])) {
    $cache = cache_get($cid, 'cache_menu');
    if ($cache && isset($cache->data)) {
      $data = $cache->data;
    }
    else {
      // Build the query using a LEFT JOIN since there is no match in
      // {menu_router} for an external link.
      $query = db_select('menu_links', 'ml', array('fetch' => PDO::FETCH_ASSOC));
      $query->addTag('translatable');
      $query->leftJoin('menu_router', 'm', 'm.path = ml.router_path');
      $query->fields('ml');
      $query->fields('m', array(
        'load_functions',
        'to_arg_functions',
        'access_callback',
        'access_arguments',
        'page_callback',
        'page_arguments',
        'delivery_callback',
        'tab_parent',
        'tab_root',
        'title',
        'title_callback',
        'title_arguments',
        'theme_callback',
        'theme_arguments',
        'type',
        'description',
      ));
      for ($i = 1; $i <= MENU_MAX_DEPTH; $i++) {
        $query->orderBy('p' . $i, 'ASC');
      }
      $query->condition('ml.menu_name', $menu_name);
      if ($mlid > 0) {
        $item = menu_link_load($mlid);
        if ($item) {
          // The tree is a subtree of $menu_name, so we need to restrict the query to
          // this subtree.
          $px = "p" . (int) $item['depth'];
          $and = db_and()->condition("ml.$px", $item[$px])->condition("ml.mlid", $mlid, '!=');
          $query->condition($and);
        }
      }

      // Build an ordered array of links using the query result object.
      $links = array();
      foreach ($query->execute() as $item) {
        $links[] = $item;
      }

      $data['tree'] = menu_tree_data($links);
      if (count($data['tree']) == 1) {
        // Move the menu items from below to root
        $key = key($data['tree']);
        foreach ($data['tree'][$key]['below'] as $id => $item) {
          $data['tree'][$id] = $item;
          unset($data['tree'][$key]['below'][$id]);
        }
      }

      $data['node_links'] = array();
      menu_tree_collect_node_links($data['tree'], $data['node_links']);
      menu_tree_check_access($data['tree'], $data['node_links']);
      cache_set($cid, $data, 'cache_menu');
    }

    $tree[$cid] = $data['tree'];
  }

  return $tree[$cid];
}

/**
 * Determine if editmenu should be displayed based on visibility settings.
 *
 * @return boolean
 */
function _editmenu_page_visibility() {
  $operator = variable_get('editmenu_visibility_operator', 0);
  $pages = variable_get('editmenu_visibility_pages', '');

  if ($pages) {
    $path = drupal_get_path_alias($_GET['q']);
    // Compare with the internal and path alias (if any).
    $page_match = drupal_match_path($path, $pages);
    if ($path != $_GET['q']) {
      $page_match = $page_match || drupal_match_path($_GET['q'], $pages);
    }
    // When $operator has a value of 0, the menu is displayed on
    // all pages except those listed in $pages. When set to 1, it
    // is displayed only on those pages listed in $pages.
    $page_match = !($operator ^ $page_match);
  }
  else {
    $page_match = TRUE;
  }

  return $page_match;
}

/**
 * Check whether the superuser/admin should be shown editmenu.
 */
function _editmenu_superuser_active() {
  global $user;
  return $user->uid != 1 || variable_get('editmenu_uid1', 1) == 1;
}
