<?php
// $Id$

/**
 * @file
 * Implementation of a jQuery Drawer.
 *
 * This module implements the jQuery.drawer navigation menu from
 * http://lib.metatype.jp/jquery_drawer/sample.html
 */

/**
 * Implementation of hook_uninstall().
 */
function jquery_drawer_uninstall() {
  variable_del('jquery_drawer');
  variable_del('jquery_drawer_drw');
  variable_del('jquery_drawer_link');
}

/**
 * Implementation of hook_init().
 */
function jquery_drawer_init() {
  theme('jquery_drawer_css');
  theme('jquery_drawer_javascript');
}

/**
 * Implementation of hook_block().
 */
function jquery_drawer_block($op = 'list', $delta = 0, $edit = array()) {
  switch ($op) {
    case 'list':
      $blocks[0]['info']  = t('jQuery Drawer');
      $blocks[0]['cache'] = BLOCK_NO_CACHE;
      return $blocks;

    case 'configure':
      $query  = 'SELECT vid, name from {vocabulary}';
      $result = db_query(db_rewrite_sql($query));
      while ($vocabulary = db_fetch_object($result)) {
        $vocabularies[$vocabulary->vid] = $vocabulary->name;
      }
      $form['jquery_drawer'] = array(
        '#type'          => 'select',
        '#title'         => t('Select the vocabulary to list'),
        '#default_value' => variable_get('jquery_drawer', '1'),
        '#options'       => $vocabularies,
      );
      $form['jquery_drawer_drw'] = array(
        '#type'          => 'checkbox',
        '#title'         => t('Do not show drawer box.'),
        '#description'   => t('Select this option if you plan to manually provide the drawer box.'),
        '#default_value' => variable_get('jquery_drawer_drw', '0'),
      );
      $form['jquery_drawer_link'] = array(
        '#type'          => 'textfield',
        '#title'         => t('Base link path (useful for views).'),
        '#description'   => t('Set the base link for nodes listed in drawer.'),
        '#default_value' => variable_get('jquery_drawer_link', 'node'),
      );      
      return $form;

    case 'save':
      variable_set('jquery_drawer',      $edit['jquery_drawer']);
      variable_set('jquery_drawer_drw',  $edit['jquery_drawer_drw']);
      variable_set('jquery_drawer_link', $edit['jquery_drawer_link']);
      break;

    case 'view':
      // Get all terms from a given vocabulary
      $vid  = variable_get('jquery_drawer', '1');
      $menu = taxonomy_node_tree_parents($vid);

      // Remove empty menus
      foreach ($menu as $key => $term) {
        if (jquery_drawer_check_empty($term->tid)) {
          unset($menu[$key]);
        }
      }

      $block['content'] = theme('jquery_drawer', $menu);
      return $block;
  }
}

/**
 * Check empty menus.
 */
function jquery_drawer_check_empty($tid) {
  $parents  = array();
  $nodes    = jquery_drawer_select_nodes(array($tid));
  $children = jquery_drawer_get_children($tid);

  while ($node = db_fetch_object($nodes)) {
    $parents[] = $node;
  }

  if (empty($parents) && empty($children)) {
    return TRUE;
  }
}

/**
 * Static version of taxonomy_select_nodes().
 */
function jquery_drawer_select_nodes($tid = NULL) {
  static $cache = array();

  if (isset($cache[$tid])) {
    $cache[$tid] = taxonomy_select_nodes(array($tid));
  }

  return $cache[$tid];
}

/**
 * Implementation of hook_menu().
 */
function jquery_drawer_menu() {
  $items['jquery_drawer'] = array(
    'title'            => 'jQuery Drawer',
    'description'      => 'Displays content inside a jQuery Drawer.',
    'page callback'    => 'jquery_drawer_page',
    'access arguments' => array('access content'),
    'type'             => MENU_CALLBACK,
  );
  return $items;
}

/**
 * Implementation of hook_theme().
 */
function jquery_drawer_theme() {
  return array(
      'jquery_drawer' => array(
        'arguments'   => array(
          'menu'      => NULL,
          ),
        ),
      'jquery_drawer_javascript' => array(
        'arguments'              => array(),
        ),
      'jquery_drawer_css'        => array(
        'arguments'              => array(),
        ),
      'jquery_drawer_link'       => array(
        'arguments'              => array(),
        ),
      );
}

/**
 * Drawer logic.
 *
 * @ingroup themeable
 */
function theme_jquery_drawer($menu) {
  $output  = '<ul id="drw_tabs">';
  $output .= implode((array) module_invoke_all('jquery_drawer'));
  
  if (module_exists('i18n')) {
    $menu = i18ntaxonomy_localize_terms($menu);
  }

  foreach ($menu as $item) {
    $link['title'] = $item->name;
    $link['href']  = 'jquery_drawer/'. $item->tid;
    $output       .= theme('jquery_drawer_link', $link);
  }

  $output .= '</ul>';

  if (variable_get('jquery_drawer_drw', '0') == 0) {
    $output .= '<div id="drw">';
    $output .= '</div>';
  }

  return $output;
}

/**
 * Render all nodes whose terms are children of $tid.
 */
function jquery_drawer_get_children($tid = NULL) {
  static $cache = array();

  if (isset($cache[$tid])) {
    return $cache[$tid];
  }

  $vid   = variable_get('jquery_drawer', '1');
  $terms = taxonomy_node_tree_taxonomy_get_tree($vid, $tid);

  if (module_exists('i18n')) {
    $terms = i18ntaxonomy_localize_terms($terms);
  }

  foreach ($terms as $term) {
    $filter[] = $term->tid;
  }

  if (isset($filter) && !empty($filter)) {
    // Then render all nodes whose terms are children of $term
    $query  = 'SELECT DISTINCT n.nid, n.title, term_node.tid FROM {node} n LEFT JOIN
               {term_node} ON term_node.nid = n.nid WHERE term_node.tid IN (%s)
               AND n.status = "1" ORDER BY term_node.weight_in_tid ASC';
    
    //$query = db_rewrite_sql($query);
    $nodes = db_query(db_rewrite_sql($query), implode(',', $filter));
    $tree  = taxonomy_node_tree_build($nodes, $terms);

    $cache[$tid] = $tree;
    return $tree;
  }

  $cache[$tid] = NULL;
}

/**
 * Menu callback.
 */
function jquery_drawer_page($tid = NULL) {
  static $cache = array();

  if (!isset($cache[$tid])) {
    $output  = '';
    $nodes   = jquery_drawer_select_nodes(array($tid));
    $base    = variable_get('jquery_drawer_link', 'node');
    $tree    = jquery_drawer_get_children($tid);
    $output .= '<ul id="drw_item" class="hidden">';

    // First render all nodes whose parent is $term
    while ($node = db_fetch_object($nodes)) {
      path_nodeapi($node,'load','');
      $link['title']  = $node->title;
      $link['href']   = ($node->path?$node->path:"$base/". $node->nid);
      $output        .= theme('jquery_drawer_link', $link);
    }

    // Add other nodes
    if (is_array($tree) && !empty($tree)) {
      foreach ($tree as $term) {
        $output .= taxonomy_node_tree_list($term, 'jquery_drawer', 'hidden', $base);
      }
    }
    else {
      $output .= t('No content exists for this topic yet.');
    }

    $output      .= '</ul></li>';
    $cache[$tid]  = $output;
  }

  // Display output
  echo($output);

  // We need to exit here to avoid themeable output
  exit();
}

/**
 * jQuery Drawer Javascript theme function.
 *
 * @ingroup themeable
 */
function theme_jquery_drawer_javascript() {
  drupal_add_js(drupal_get_path('module', 'jquery_drawer') .'/jquery_drawer/drw/scripts.js');
}

/**
 * jQuery Drawer CSS theme function.
 *
 * @ingroup themeable
 */
function theme_jquery_drawer_css() {
  drupal_add_css(drupal_get_path('module', 'jquery_drawer') .'/jquery_drawer/drw/styles.css');
  drupal_add_css(drupal_get_path('module', 'jquery_drawer') .'/jquery_drawer.css');
}

/**
 * jQuery Drawer Link theme function.
 *
 * @ingroup themeable
 */
function theme_jquery_drawer_link($link) {
  if (empty($link['localized_options'])) {
    $link['localized_options'] = array();
  }

  $link['attributes']['rel'] = 'drw';

  $output  = '<li class="drw_li">';
  $output .= l($link['title'], $link['href'], array('attributes' => array('rel' => 'drw')));
  $output .= '</li>';

  return $output;
}