<?php

/**
 * @file
 * Accessible content monitor. Creates an 'Accessible content' link in the
 * navigation menu to display a summary of all content accessible to the
 * logged-in user as determined by the enabled content access modules.
 */
require_once drupal_get_path('module', 'module_grants_monitor') .'/module_grants_monitor.pages.inc';

define('I_CREATED', '1');
define('I_LAST_MODIFIED', '2');

/**
 * Implementation of hook_help().
 */
function module_grants_monitor_help($path, $arg) {
  switch ($path) {
    case 'admin/help#module_grants_monitor':
      $s = t('For documentation see the <a href="@module_grants">Module Grants project page</a>',
        array('@module_grants' => url('http://drupal.org/project/module_grants')));
      break;

    case 'accessible-content/i-created':
    case 'accessible-content/i-created/published':
    case 'accessible-content/i-created/not-published':
      $s = t('Showing all content <em>you created</em> and still have at least view access to, filtered by publication status.');
      break;
    case 'accessible-content/i-created/all':
      $s = t('Showing all content <em>you created</em> and still have at least view access to.');
      break;
    case 'accessible-content/i-last-modified':
    case 'accessible-content/i-last-modified/published':
    case 'accessible-content/i-last-modified/not-published':
      $s = t('Showing all content <em>you last modified</em> and still have at least view access to, filtered by publication status.');
      break;
    case 'accessible-content/i-last-modified/all':
      $s = t('Showing all content <em>you last modified</em> and still have at least view access to.');
      break;
    case 'accessible-content/i-can-edit':
    case 'accessible-content/i-can-edit/published':
    case 'accessible-content/i-can-edit/not-published':
      $s = t('Showing all content you can <em>edit</em>, filtered by publication status.');
      break;
    case 'accessible-content/i-can-edit/all':
      $s = t('Showing all content you can <em>edit</em>.');
      break;
    case 'accessible-content/i-can-view':
    case 'accessible-content/i-can-view/published':
    case 'accessible-content/i-can-view/not-published':
      $s = t('Showing all content you have at least <em>view</em> access to, filtered by publication status.');
      break;
    case 'accessible-content/i-can-view/all':
      $s = t('Showing all content you have at least <em>view</em> access to.');
      break;
  }
  return empty($s) ? '' : '<p>'. $s .'</p>';
}

/**
 * Implementation of hook_perm().
 *
 * The order of the permissions is relevant to the dynamic allocation of
 * suitable default tab selections.
 */
function module_grants_monitor_perm() {
  return array(
    // tab row 1:
    'access I Created tab', 'access I Last Modified tab', 'access I Can Edit tab', 'access I Can View tab',
    // tab row 2:
    'access Published tab', 'access Unpublished tab', 'access All tab');
}

/**
 * Implementation of hook_theme().
 *
 * Register the theme_hooks() available in this module, with their arguments
 * and default values.
 */
function module_grants_monitor_theme() {
  return array(
    'module_grants_monitor_nodes_summary' => array(
        // to call theme_module_grants_monitor_nodes_summary($nodes)
       'arguments' => array('nodes' => NULL)
    )
  );
}

/**
 * Implementation of hook_menu().
 *
 * Define new menu items and local tasks (tabs).
 * Existing menu items are modified through hook_menu_alter().
 */
function module_grants_monitor_menu() {
  $items = array();

  // Create an 'Acessible content' menu item in the navigation menu.
  // Add tabs: 'I created', 'I last modified', 'I can edit', 'I can view', each
  // with sub tabs 'Published', 'Unpublished', 'All'

  // There's an issue w.r.t assigning default tab selections for the
  // 'Accessible content' menu item. Core insists that each row of tabs has
  // exactly one tab defined with type=MENU_DEFAULT_LOCAL_TASK, the other tabs
  // having type=MENU_LOCAL_TASK.
  // The default we set needs to be part of the subset of tabs that the user
  // is permitted to see. The problem is that the user permissions are evaluated
  // when the menu and its tabs are about to be rendered (in menu.inc,
  // function theme_menu_local_tasks()), whereas the type must be defined
  // upfront when the menu structure is created, i.e. in the lines below.
  // The way we get around this problem is to first load the page with content
  // according to the user permissions, by calling this module's function
  // _module_grants_monitor_accessible_content_summary(). Then we take advantage
  // of the Smart menus module, which overrides theme_menu_local_tasks(), to
  // highlight as 'current' the tabs matching the content shown.

  $items['accessible-content'] = array(
    'title' => 'Accessible content',
    'page callback' => '_module_grants_monitor_accessible_content_summary',
    'page arguments' => array(), // tabs default based on user permissions
    'access callback' => 'user_tools_user_any_access',
    'access arguments' => array(module_grants_monitor_perm()),
    'weight' => 2
  );

  // 'I created' and sub tabs
  $items['accessible-content/i-created'] = array(
    'title' => 'I created',
    'page callback' => '_module_grants_monitor_accessible_content_summary',
    'page arguments' => array('access I Created tab'), // 2nd tab defaults
    'access callback' => 'user_access',
    'access arguments' => array('access I Created tab'),
    'type' => MENU_LOCAL_TASK,
    'weight' => 0
  );
  $items['accessible-content/i-created/published'] = array(
    'title' => 'Published',
    'page callback' => 'module_grants_monitor_accessible_content_summary', // both tabs known
    'page arguments' => array('view', '1', I_CREATED),
    'access callback' => 'user_tools_user_all_access',
    'access arguments' => array(array('access I Created tab', 'access Published tab')),
    'type' => MENU_LOCAL_TASK,
  );
  $items['accessible-content/i-created/not-published'] = array(
    'title' => 'Unpublished',
    'page callback' => 'module_grants_monitor_accessible_content_summary', // both tabs known
    'page arguments' => array('view', '0', I_CREATED),
    'access callback' => 'user_tools_user_all_access',
    'access arguments' => array(array('access I Created tab', 'access Unpublished tab')),
    'type' => MENU_LOCAL_TASK,
    'weight' => 1
  );
  $items['accessible-content/i-created/all'] = array(
    'title' => 'All',
    'page callback' => 'module_grants_monitor_accessible_content_summary', // both tabs known
    'page arguments' => array('view', '-1', I_CREATED),
    'access callback' => 'user_tools_user_all_access',
    'access arguments' => array(array('access I Created tab', 'access All tab')),
    'type' => MENU_LOCAL_TASK,
    'weight' => 5
  );

  // 'I last modified' and sub tabs
  $items['accessible-content/i-last-modified'] = array(
    'title' => 'I last modified',
    'page callback' => '_module_grants_monitor_accessible_content_summary', // 2nd tab defaults
    'page arguments' => array('access I Last Modified tab'),
    'access callback' => 'user_access',
    'access arguments' => array('access I Last Modified tab'),
    'type' => MENU_LOCAL_TASK,
    'weight' => 5
  );
  $items['accessible-content/i-last-modified/published'] = array(
    'title' => 'Published',
    'page callback' => 'module_grants_monitor_accessible_content_summary', // both tabs known
    'page arguments' => array('view', '1', I_LAST_MODIFIED),
    'access callback' => 'user_tools_user_all_access',
    'access arguments' => array(array('access I Last Modified tab', 'access Published tab')),
    'type' => MENU_LOCAL_TASK,
  );
  $items['accessible-content/i-last-modified/not-published'] = array(
    'title' => 'Unpublished',
    'page callback' => 'module_grants_monitor_accessible_content_summary', // both tabs known
    'page arguments' => array('view', '0', I_LAST_MODIFIED),
    'access callback' => 'user_tools_user_all_access',
    'access arguments' => array(array('access I Last Modified tab', 'access Unpublished tab')),
    'type' => MENU_LOCAL_TASK,
    'weight' => 1
  );
  $items['accessible-content/i-last-modified/all'] = array(
    'title' => 'All',
    'page callback' => 'module_grants_monitor_accessible_content_summary', // both tabs known
    'page arguments' => array('view', '-1', I_LAST_MODIFIED),
    'access callback' => 'user_tools_user_all_access',
    'access arguments' => array(array('access I Last Modified tab', 'access All tab')),
    'type' => MENU_LOCAL_TASK,
    'weight' => 5
  );

  // 'I can edit' and sub tabs
  $items['accessible-content/i-can-edit'] = array(
    'title' => 'I can edit',
    'page callback' => '_module_grants_monitor_accessible_content_summary', // 2nd tab defaults
    'page arguments' => array('access I Can Edit tab'),
    'access callback' => 'user_access',
    'access arguments' => array('access I Can Edit tab'),
    'type' => MENU_LOCAL_TASK,
    'weight' => 10
  );
  $items['accessible-content/i-can-edit/published'] = array(
    'title' => 'Published',
    'page callback' => 'module_grants_monitor_accessible_content_summary', // both tabs known
    'page arguments' => array('update', '1'),
    'access callback' => 'user_tools_user_all_access',
    'access arguments' => array(array('access I Can Edit tab', 'access Published tab')),
    'type' => MENU_LOCAL_TASK,
  );
  $items['accessible-content/i-can-edit/not-published'] = array(
    'title' => 'Unpublished',
    'page callback' => 'module_grants_monitor_accessible_content_summary', // both tabs known
    'page arguments' => array('update', '0'),
    'access callback' => 'user_tools_user_all_access',
    'access arguments' => array(array('access I Can Edit tab', 'access Unpublished tab')),
    'type' => MENU_LOCAL_TASK,
    'weight' => 1
  );
  $items['accessible-content/i-can-edit/all'] = array(
    'title' => 'All',
    'page callback' => 'module_grants_monitor_accessible_content_summary', // both tabs known
    'page arguments' => array('update', '-1'),
    'access callback' => 'user_tools_user_all_access',
    'access arguments' => array(array('access I Can Edit tab', 'access All tab')),
    'type' => MENU_LOCAL_TASK,
    'weight' => 5
  );

  // 'I can view' and sub tabs
  $items['accessible-content/i-can-view'] = array(
    'title' => 'I can view',
    'page callback' => '_module_grants_monitor_accessible_content_summary', // 2nd tab defaults
    'page arguments' => array('access I Can View tab'),
    'access callback' => 'user_access',
    'access arguments' => array('access I Can View tab'),
    'type' => MENU_LOCAL_TASK,
    'weight' => 15
  );
  $items['accessible-content/i-can-view/published'] = array(
    'title' => 'Published',
    'page callback' => 'module_grants_monitor_accessible_content_summary',  // both tabs known
    'page arguments' => array('view', '1'),
    'access callback' => 'user_tools_user_all_access',
    'access arguments' => array(array('access I Can View tab', 'access Published tab')),
    'type' => MENU_LOCAL_TASK,
  );
  $items['accessible-content/i-can-view/not-published'] = array(
    'title' => 'Unpublished',
    'page callback' => 'module_grants_monitor_accessible_content_summary', // both tabs known
    'page arguments' => array('view', '0'),
    'access callback' => 'user_tools_user_all_access',
    'access arguments' => array(array('access I Can View tab', 'access Unpublished tab')),
    'type' => MENU_LOCAL_TASK,
    'weight' => 1
  );
  $items['accessible-content/i-can-view/all'] = array(
    'title' => 'All',
    'page callback' => 'module_grants_monitor_accessible_content_summary', // both tabs known
    'page arguments' => array('view', '-1'),
    'access callback' => 'user_tools_user_all_access',
    'access arguments' => array(array('access I Can View tab', 'access All tab')),
    'type' => MENU_LOCAL_TASK,
    'weight' => 5
  );

  return $items;
}

/**
 * Similar to module_grants_monitor_accessible_content_summary (which it calls)
 * but with a different parameter list based on the (lack of) default tabs, as
 * opposed to content properties.
 *
 * @param $tab1
 * @param $tab2
 * @param $account
 * @return unknown_type
 */
function _module_grants_monitor_accessible_content_summary($tab1 = NULL, $tab2 = NULL, $account = NULL) {
  // First 4 Module Grants Monitor permissions pertain to 1st row of tabs
  $permissions_tab_row1 = array_slice(module_grants_monitor_perm(), 0, 4);
  // 2nd row has Revisioning perm followed by remaining Module Grants Monitor perms
  $permissions_tab_row2 = module_exists('revisioning') ? array('access Pending tab') : array();
  $permissions_tab_row2 = array_merge($permissions_tab_row2, array_slice(module_grants_monitor_perm(), 4));

  if (!$tab1) {
    $tab1 = user_tools_find_first_permission($permissions_tab_row1);
  }
  elseif (!user_access($tab1, $account)) {
    unset($tab1);
  }
  if (!$tab2) {
    $tab2 = user_tools_find_first_permission($permissions_tab_row2);
  }
  elseif (!user_access($tab2, $account)) {
    unset($tab2);
  }
  if (!($tab1 && $tab2)) {
    drupal_set_message(t('For you to see the list of Accessible content your administrator must give you permissions to one or more tabs of each of the two tab rows.'), 'warning');
    return '';
  }
  $access = 'view';
  $user_filter = NO_FILTER;
  $published = NO_FILTER;
  $is_moderated = NO_FILTER;
  $is_pending = FALSE;
  switch ($tab1) {
    case 'access I Created tab':
      $user_filter = I_CREATED;
      break;
    case 'access I Last Modified tab':
      $user_filter = I_LAST_MODIFIED;
      break;
    case 'access I Can Edit tab':
      $access = 'update';
      break;
  }
  switch ($tab2) {
    case 'access Published tab':
      $published = TRUE;
      break;
    case 'access Unpublished tab':
      $published = FALSE;
      break;
    case 'access Pending tab':
      $is_moderated = user_access('administer nodes') ? NO_FILTER : TRUE;
      $is_pending = TRUE;
      break;
  }
  return module_grants_monitor_accessible_content_summary($access, $published, $user_filter, $is_moderated, $is_pending);
}