<?php
// $Id$

/**
 * @file
 * Creates a simplemenu.
 */

/**
 * Implementation of hook_menu().
 */
function simplemenu_menu() {
  $items = array();

  $items['admin/settings/simplemenu'] = array(
    'title' => 'SimpleMenu',
    'description' => 'Select the menu to display.',
    'page callback' => 'drupal_get_form',
    'page arguments' => array('simplemenu_admin_settings'),
    'access arguments' => array('administer simplemenu')
    );

  return $items;
}

/**
 * Implementation of hook_init()
 */
function simplemenu_init() {
  global $theme;
  $exclusions = variable_get('simplemenu_exclusions', array());
  if (user_access('view simplemenu') && (!isset($exclusions[$theme])) ) {
    global $theme, $custom_theme;
    $path = drupal_get_path('module', 'simplemenu');
    $simplemenu_theme = variable_get('simplemenu_theme', 'original');
    drupal_add_css($path .'/simplemenu.css');

    if ($simplemenu_theme != 'custom') {
      drupal_add_css($path .'/themes/'. $simplemenu_theme .'/'. $simplemenu_theme .'.css');
    }

    $settings = array(
      'effect' => variable_get('simplemenu_effect', 'opacity'),
      'effectSpeed' => variable_get('simplemenu_effect_speed', 'fast'),
      'element' => variable_get('simplemenu_element', 'body'),
      'hideDelay' => variable_get('simplemenu_hide_delay', 800),
      'placement' => variable_get('simplemenu_element_method', 'prepend'),
    );

    drupal_add_js(array('simplemenu' => $settings), 'setting');
    drupal_add_js('var simplemenu = '. drupal_to_js(simplemenu_get_menu()) .';', 'inline');
    drupal_add_js($path .'/simplemenu.js');
    drupal_add_js($path .'/superfish.js');
  }
}

/**
 * Implementation of hook_perm().
 */
function simplemenu_perm() {
  return array('view simplemenu', 'administer simplemenu');
}

/**
 * SimpleMenu settings page.
 */
function simplemenu_admin_settings() {
  if (module_exists('menu')) {
    $form['default_menu']['simplemenu_menu'] = array(
      '#type' => 'select',
      '#title' => t('Menu'),
      '#options' => menu_parent_options(menu_get_menus(), array( 'mlid' => 0 )), // return complete tree;
      '#default_value' => variable_get('simplemenu_menu', 'navigation:0'),
      '#description' => t('Select the menu to display.')
    );
  }

  $form['default_menu']['simplemenu_theme'] = array(
    '#type' => 'select',
    '#title' => t('Theme'),
    '#options' => array('original' => 'original', 'blackblue' => 'black & blue', 'custom' => 'custom'),
    '#default_value' => variable_get('simplemenu_theme', 'original'),
    '#description' => t('Select which theme to use. If you specify custom, you need to define CSS in your theme.')
  );

  $form['default_menu']['advanced'] = array(
    '#type' => 'fieldset',
    '#title' => t('Advanced settings'),
    '#collapsible' => TRUE,
    '#collapsed' => TRUE
  );

  $form['default_menu']['advanced']['simplemenu_element'] = array(
    '#type' => 'textfield',
    '#title' => t('CSS selector to attach menu to'),
    '#default_value' => variable_get('simplemenu_element', 'body'),
    '#description' => t('A valid CSS selector to attach the menu to. <em>Example: body, #primary, div.my-class</em>'),
    '#required' => TRUE
  );

  $form['default_menu']['advanced']['simplemenu_element_method'] = array(
    '#type' => 'radios',
    '#title' => t('Attach method'),
    '#options' => drupal_map_assoc(array('prepend', 'append')),
    '#default_value' => variable_get('simplemenu_element_method', 'prepend'),
    '#description' => t('Choose how the menu should be attached to the above selector.'),
    '#required' => TRUE
  );

  $form['default_menu']['advanced']['simplemenu_exclusions'] = array(
    '#type' => 'checkboxes',
    '#title' => t('Theme exclusions'),
    '#options' => drupal_map_assoc(array_keys(list_themes())),
    '#default_value' => variable_get('simplemenu_exclusions', array()),
    '#description' => t('Select which themes to <strong>not</strong> display the menu. Use this when you have a theme that displays its own admin navigation.'),
  );
  
  $form['default_menu']['advanced']['simplemenu_hide_delay'] = array(
    '#type' => 'textfield',
    '#title' => t('Hide delay'),
    '#size' => 4,
    '#default_value' => variable_get('simplemenu_hide_delay', 800),
    '#description' => t('How long (in milliseconds) should a menu still appear after losing focus.')
  );
  
  $form['default_menu']['advanced']['simplemenu_effect'] = array(
    '#type' => 'radios',
    '#title' => t('Show effect'),
    '#options' => array('opacity' => t('Fade'), 'height' => t('Slide'), 'none' => t('None')),
    '#default_value' => variable_get('simplemenu_effect', 'opacity'),
    '#description' => t('The effect used when displaying a menu.')
  );
  
  $form['default_menu']['advanced']['simplemenu_effect_speed'] = array(
    '#type' => 'radios',
    '#title' => t('Show speed'),
    '#options' => array('slow' => t('Slow'), 'medium' => t('Medium'), 'fast' => t('Fast')),
    '#default_value' => variable_get('simplemenu_effect_speed', 'fast'),
    '#description' => t('The speed of the effect, not used when "none" is set to show effect.')
  );

  return system_settings_form($form);
}

/**
 * Render an HTML list of links for a given menu.
 */
function simplemenu_get_menu() {
  $output = '';

  // if a user turned off menu module but SimpleMenu was previously set
  // reset variable so a menu appears
  $menu_name = module_exists('menu') ? variable_get('simplemenu_menu', 'navigation:0') : 'navigation:0';
  $menu = simplemenu_menu_tree($menu_name);

  if (!$menu) {
    $menu = '<li><a href="'. url('admin/settings/simplemenu') .'">'. t('No menu items found. Try a different menu as the default.') .'</a></li>';
  }

  $output .= $menu;

  return $output;
}

/**
 * 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 simplemenu_menu_tree($menu_name = 'navigation:0') {
  static $menu_output = array();

  if (!isset($menu_output[$menu_name])) {  
    $tree = simplemenu_tree_all_data($menu_name);
    $menu_output[$menu_name] = menu_tree_output($tree);
  }
  return $menu_output[$menu_name];  
}

/**
 * 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, $mlid would be sufficient
 */
function simplemenu_tree_all_data($root_menu = 'navigation:0') {
  static $tree = array();
  
  list($menu_name, $mlid) = explode(':', $root_menu);

  // Generate the cache ID.
  // "links:navigation:all:2" means "all from root to 2" (what the ...), so for "all from 2 down" we do "links:navigation:all:2:all"
  $cid = "links:$menu_name:all:$mlid". ($mlid ? ':all' : '');

  if (!isset($tree[$cid])) {
    // If the static variable doesn't have the data, check {cache_menu}.
    $cache = cache_get($cid, 'cache_menu');
    if ($cache && isset($cache->data)) {
      $data = $cache->data;
    }
    else {
      // Build and run the query, and build the tree.
      if ($mlid > 0) {
        $item = menu_link_load($mlid);
        // The tree is a subtree of $menu_name, so we need to restrict the query to
        // this subtree.
        $px = "p$item[depth]";
        $where = " AND ml.$px = %d AND ml.mlid != %d";
        $args = array($item[$px], $mlid);
      }
      else {
        // Get all links in this menu.
        $where = '';
        $args = array();
      }
      array_unshift($args, $menu_name);
      // Select the links from the table, and recursively build the tree.  We
      // LEFT JOIN since there is no match in {menu_router} for an external
      // link.
      $data['tree'] = menu_tree_data(db_query("
        SELECT m.load_functions, m.to_arg_functions, m.access_callback, m.access_arguments, m.page_callback, m.page_arguments, m.title, m.title_callback, m.title_arguments, m.type, m.description, ml.*
        FROM {menu_links} ml LEFT JOIN {menu_router} m ON m.path = ml.router_path
        WHERE ml.menu_name = '%s'". $where ."
        ORDER BY p1 ASC, p2 ASC, p3 ASC, p4 ASC, p5 ASC, p6 ASC, p7 ASC, p8 ASC, p9 ASC", $args));
      $data['node_links'] = array();
      menu_tree_collect_node_links($data['tree'], $data['node_links']);
      // Cache the data.
      cache_set($cid, $data, 'cache_menu');
    }
    // Check access for the current user to each item in the tree.
    menu_tree_check_access($data['tree'], $data['node_links']);
    $tree[$cid] = $data['tree'];
  }

  return $tree[$cid];
}