<?php

include_once('atrium_book.features.inc');

/**
 * Implementation of hook_help().
 */
function atrium_book_help($path, $arg) {
  if (($path == 'help#atrium_book') || context_isset('context', 'book_listing')) {
    switch ($path) {
      case 'node/add/book':
      case 'node/%/edit':
        $help = '';
        $help .= '<h3>'. t('Notebook') .'</h3>';
        $help .= '<p>'. t('Tips for adding & editing book pages:') .'</p>';
        $help .= '<ul>';
        $help .= '<li>'. t('Create a new book or choose an existing one for your page.') .'</li>';
        $help .= '<li>'. t('Select a position for your page in the book\'s hierarchy and <strong>weight</strong> your page higher or lower if you would like to move it before or after other pages around it.') .'</li>';
        $help .= '<li>'. t('Consider adding a <strong>log message</strong> when editing existing pages so others can get a quick summary of changes you have made.') .'</li>';
        $help .= '</ul>';
        return $help;

      case 'help#atrium_book':
      default:
        $help = '';
        $help .= '<h3>'. t('Notebook') .'</h3>';
        $help .= '<p>'. t('The notebook section provides a way for you to store and share information with your group members. With the book feature you can:') .'</p>';
        $help .= '<ul>';
        $help .= '<li>'. t('!add_book_pages and organize them hierarchically into different books.', array('!add_book_pages' => l(t('Add book pages'), 'node/add/book'))) .'</li>';
        $help .= '<li>'. t('Attach files to pages to share them with others.') .'</li>';
        $help .= '<li>'. t('Track changes that others have made and revert changes as necessary.') .'</li>';
        $help .= '<li>'. t('!archive books that are no longer of interest to the group. Archived books can be reactivated later if needed.', array('!archive' => l(t('Archive'), 'notebook/archived'))) .'</li>';
        $help .= '</ul>';
        return $help;
    }
  }
}

/**
 * Implementation of hook_menu().
 */
function atrium_book_menu() {
  $items = array();
  $items['notebook'] = array(
    'title' => 'Notebook',
    'page callback' => 'atrium_book_overview',
    'page arguments' => array(),
    'access callback' => module_exists('spaces') ? 'spaces_access_feature': 'user_access',
    'access arguments' => module_exists('spaces') ? array('view', 'atrium_book') : array('access content'),
    'type' => MENU_NORMAL_ITEM,
    'menu_name' => 'features',
    'file' => 'atrium_book.pages.inc',
  );
  $items['notebook/overview'] = array(
    'title' => 'Overview',
    'page callback' => 'atrium_book_overview',
    'page arguments' => array(),
    'access callback' => module_exists('spaces') ? 'spaces_access_feature': 'user_access',
    'access arguments' => module_exists('spaces') ? array('view', 'atrium_book') : array('access content'),
    'type' => MENU_DEFAULT_LOCAL_TASK,
    'weight' => -10,
    'file' => 'atrium_book.pages.inc',
  );
  $items['features/atrium_book'] = array(
    'title' => 'Settings',
    'page callback' => 'drupal_get_form',
    'page arguments' => array('atrium_book_settings'),
    'access callback' => module_exists('spaces') ? 'spaces_access_admin' : 'user_access',
    'access arguments' => module_exists('spaces') ? array() : array('administer site configuration'),
    'type' => MENU_CALLBACK,
    'file' => 'atrium_book.pages.inc',
  );
  return $items;
}

/**
 * Implementation of hook_block().
 */
function atrium_book_block($op = 'list', $delta = 0) {
  switch ($op) {
    case 'list':
      if (module_exists('admin')) {
        $info = array(
          'book' => array('info' => t('Atrium Book: Book')),
          'book_all' => array('info' => t('Atrium Book: Book (all)')),
        );
      }
      return $info;
    case 'view':
      module_load_include('inc', 'atrium_book', 'atrium_book.block');
      $function = "_atrium_book_block_{$delta}";
      if (function_exists($function)) {
        return call_user_func($function);
      }
      break;
  }
}

/**
 * Implemenation of hook_nodeapi().
 */
function atrium_book_nodeapi(&$node, $op, $teaser = NULL, $page = NULL) {
  switch ($op) {
    case 'view':
      // Hide book navigation in node body.
      if (module_exists('book') && isset($node->content['book_navigation'])) {
        $node->content['book_navigation']['#access'] = FALSE;
      }
      break;
    case 'insert':
    case 'update':
    case 'delete':
      // Wipe the atrium book tree cache for a space when a book is modified.
      if (!empty($node->book['bid'])) {
        if (module_exists('spaces') && $space = spaces_get_space()) {
          cache_clear_all("atrium_book:{$space->type}:{$space->id}", 'cache', TRUE);
        }
        else {
          cache_clear_all("atrium_book", 'cache', TRUE);
        }
      }
      break;
  }
}

/**
 * Implementation of hook_form_alter()
 */
function atrium_book_form_alter(&$form, &$form_state, $form_id) {
  if ($form['#id'] == 'node-form' && book_type_is_allowed($form['#node']->type)) {
    $node = $form['#node'];

    if (!empty($form['book'])) {
      // Fieldset mods
      $form['book']['#weight'] = !empty($form['body_field']['#weight']) ? $form['body_field']['#weight'] : 0;
      $form['book']['#collapsible'] =
      $form['book']['#collapsed'] = FALSE;

      if (!empty($form['book']['bid']['#options'])) {
        // Remove "none" option -- do not allow book pages to be orphaned
        unset($form['book']['bid']['#options'][0]);
        // Filter book options by current space
        if ($view = views_get_view('book_current')) {
          $view->set_display();
          $view->set_items_per_page(0);
          $view->execute();

          // Collect books in this space into an array
          $books = array();
          $books[$node->nid] = 1;
          if (is_array($view->result) && count($view->result)) {
            foreach ($view->result as $row) {
              $books[$row->nid] = 1;
            }
          }

          // Use collected array to filter options
          foreach ($form['book']['bid']['#options'] as $k => $v) {
            if (is_numeric($k) && !isset($books[$k])) {
              unset($form['book']['bid']['#options'][$k]);
            }
          }
        }
      }
    }
  }
}

/**
 * Implementation of hook_context_links_alter();
 */
function atrium_book_context_links_alter(&$links) {
  if (context_get('context', 'book_listing') && isset($links['book']) && module_exists('spaces') && $space = spaces_get_space()) {
    $item = menu_get_item('node/add/book');
    $node = menu_get_object();
    if ($item['access'] && !empty($node->book['mlid'])) {
      $links['book']['query'] = "parent={$node->book['mlid']}";
    }
  }
}

/**
 * Implementation of hook_menu_alter().
 */
function atrium_book_menu_alter(&$items) {
  // Kill undesirable menu item
  if (!empty($items['book'])) {
    unset($items['book']);
  }
}