<?php
// $Id$

/**
 * Implements hook_help().
 */
function dashboard_help($path, $arg) {
  switch ($path) {
    case 'admin/help#dashboard':
      $output = '';
      $output .= '<h3>' . t('About') . '</h3>';
      $output .= '<p>' . t('The Dashboard module provides a <a href="@dashboard">Dashboard page</a> in the administrative interface for organizing administrative tasks and navigation, and tracking information within your site. The Dashboard page contains blocks, which you can add to and arrange using the drag and drop interface that appears when you click on the <em>Customize dashboard</em> link. For more information, see the online handbook entry for <a href="@handbook">Dashboard module</a>.', array('@handbook' => 'http://drupal.org/handbook/modules/dashboard', '@dashboard' => url('admin/dashboard'))) . '</p>';
      $output .= '<h3>' . t('Uses') . '</h3>';
      $output .= '<dl>';
      $output .= '<dt>' . t('Tracking user activity') . '</dt>';
      $output .= '<dd>' . t("By enabling blocks such as <em>Who's online</em> and <em>Who's new</em>, site users can track who is logged in and new user signups at a centralized location.") . '</dd>';
      $output .= '<dt>' . t('Tracking content activity') . '</dt>';
      $output .= '<dd>' . t('By enabling blocks such as <em>Recent blog posts</em>, <em>New forum topics</em> and <em>Recent comments</em>, site users can view newly added site content at a glance.') . '</dd>';
      $output .= '</dl>';
      return $output;

    case 'admin/structure/dashboard':
      // @todo This assumes the current page is being displayed using the same
      //   theme that the dashboard is displayed in.
      $output = '<p>' . t('Rearrange blocks for display on the <a href="@dashboard-url">dashboard</a>. Disabling a block makes it available on the main <a href="@blocks-url">blocks administration page</a>.', array('@dashboard-url' => url('admin/dashboard'), '@blocks-url' => url("admin/structure/block/list/{$GLOBALS['theme_key']}"))) . '</p>';
      return $output;
  }
}

/**
 * Implements hook_menu().
 */
function dashboard_menu() {
  $items['admin/structure/dashboard'] = array(
    'title' => 'Dashboard',
    'description' => 'Configure which blocks can be shown on the dashboard.',
    'page callback' => 'dashboard_admin_blocks',
    'access arguments' => array('administer blocks'),
  );
  $items['admin/dashboard'] = array(
    'title' => 'Dashboard',
    'description' => 'View and customize your dashboard.',
    'page callback' => 'dashboard_admin',
    'access arguments' => array('access dashboard'),
    // Make this appear first, so for example, in admin menus, it shows up on
    // the top corner of the window as a convenient "home link".
    'weight' => -15,
  );
  $items['admin/dashboard/customize'] = array(
    'title' => 'Customize dashboard',
    'description' => 'Customize your dashboard.',
    'page callback' => 'dashboard_admin',
    'page arguments' => array(TRUE),
    'access arguments' => array('access dashboard'),
    'type' => MENU_VISIBLE_IN_BREADCRUMB,
  );
  $items['admin/dashboard/drawer'] = array(
    'page callback' => 'dashboard_show_disabled',
    'access arguments' => array('administer blocks'),
    'type' => MENU_CALLBACK,
  );
  $items['admin/dashboard/block-content/%/%'] = array(
    'page callback' => 'dashboard_show_block_content',
    'page arguments' => array(3, 4),
    'access arguments' => array('administer blocks'),
    'type' => MENU_CALLBACK,
  );
  $items['admin/dashboard/update'] = array(
    'page callback' => 'dashboard_update',
    'access arguments' => array('administer blocks'),
    'type' => MENU_CALLBACK,
  );

  return $items;
}

/**
 * Implements hook_permission().
 */
function dashboard_permission() {
  return array(
    'access dashboard' => array(
      'title' => t('View the administrative dashboard'),
      'description' => t('Customizing the dashboard requires the !permission-name permission.', array(
        '!permission-name' => l(t('Administer blocks'), 'admin/people/permissions', array('fragment' => 'module-block')),
      )),
    ),
  );
}

/**
 * Implements hook_block_list_alter().
 *
 * Skip rendering dashboard blocks when not on the dashboard page itself. This
 * prevents expensive dashboard blocks from causing performance issues on pages
 * where they will never be displayed.
 */
function dashboard_block_list_alter(&$blocks) {
  if (!dashboard_is_visible()) {
    foreach ($blocks as $key => $block) {
      if (in_array($block->region, dashboard_regions())) {
        unset($blocks[$key]);
      }
    }
  }
}

/**
 * Implements hook_page_build().
 *
 * Display dashboard blocks in the main content region.
 */
function dashboard_page_build(&$page) {
  global $theme_key;

  if (dashboard_is_visible()) {
    $block_info = array();

    // Create a wrapper for the dashboard itself, then insert each dashboard
    // region into it.
    $page['content']['dashboard'] = array('#theme_wrappers' => array('dashboard'));
    foreach (dashboard_regions() as $region) {
      // Insert regions even when they are empty, so that they will be
      // displayed when the dashboard is being configured.
      $page['content']['dashboard'][$region] = !empty($page[$region]) ? $page[$region] : array();
      $page['content']['dashboard'][$region]['#dashboard_region'] = $region;
      // Allow each dashboard region to be themed differently, or fall back on
      // the generic theme wrapper function for dashboard regions.
      $page['content']['dashboard'][$region]['#theme_wrappers'][] = array($region, 'dashboard_region');
      unset($page[$region]);
      $blocks_found = array();
      foreach ($page['content']['dashboard'][$region] as $item) {
        if (isset($item['#theme_wrappers']) && is_array($item['#theme_wrappers']) && in_array('block', $item['#theme_wrappers'])) {
          // If this item is a block, ensure it has a subject.
          if (empty($item['#block']->subject)) {
            // Locally cache info data for the object for all blocks, in case
            // we find a block similarly missing title from the same module.
            if (!isset($block_info[$item['#block']->module])) {
              $block_info[$item['#block']->module] = module_invoke($item['#block']->module, 'block_info');
            }
            $item['#block']->subject = $block_info[$item['#block']->module][$item['#block']->delta]['info'];
          }
          $blocks_found[$item['#block']->module . '_' . $item['#block']->delta] = TRUE;
        }
      }

      // Find blocks which were not yet displayed on the page (were empty), and
      // add placeholder items in their place for rendering.
      $block_list = db_select('block')
        ->condition('theme', $theme_key)
        ->condition('status', 1)
        ->condition('region', $region)
        ->fields('block')
        ->execute();
      foreach ($block_list as $block) {
        if (!isset($blocks_found[$block->module . '_' . $block->delta])) {
          $block->enabled = $block->page_match = TRUE;
          $block->content = array('#markup' => '<div class="dashboard-block-empty">(empty)</div>');
          if (!isset($block_info[$block->module])) {
            $block_info[$block->module] = module_invoke($block->module, 'block_info');
          }
          $block->subject = t('@title', array('@title' => $block_info[$block->module][$block->delta]['info']));
          $block_render = array($block->module . '_' . $block->delta => $block);
          $build = _block_get_renderable_array($block_render);
          $page['content']['dashboard'][$block->region][] = $build;
        }
      }
    }
  }
}

/**
 * Implements hook_system_info_alter().
 *
 * Add regions to each theme to store the dashboard blocks.
 */
function dashboard_system_info_alter(&$info, $file, $type) {
  if ($type == 'theme') {
    $info['regions'] += dashboard_region_descriptions();
    // Indicate that these regions are intended to be displayed whenever the
    // dashboard is displayed in an overlay. This information is provided for
    // any module that might need to use it, not just the core Overlay module.
    $info['overlay_regions'] = !empty($info['overlay_regions']) ? array_merge($info['overlay_regions'], dashboard_regions()) : dashboard_regions();
  }
}

/**
 * Implements hook_theme().
 */
function dashboard_theme() {
  return array(
    'dashboard' => array(
      'render element' => 'element',
    ),
    'dashboard_admin' => array(
      'render element' => 'element',
    ),
    'dashboard_region' => array(
      'render element' => 'element',
    ),
    'dashboard_disabled_blocks' => array(
      'variables' => array('blocks' => NULL),
    ),
    'dashboard_disabled_block' => array(
      'variables' => array('block' => NULL),
    ),
    'dashboard_admin_display_form' => array(
      // When building the form for configuring dashboard blocks, reuse the
      // Block module's template for the main block configuration form.
      'template' => 'block-admin-display-form',
      'path' => drupal_get_path('module', 'block'),
      'file' => 'block.admin.inc',
      'render element' => 'form',
    ),
  );
}

/**
 * Implements hook_forms().
 */
function dashboard_forms() {
  // Reroute the dashboard configuration form to the main blocks administration
  // form. This allows us to distinguish them by form ID in hook_form_alter().
  $forms['dashboard_admin_display_form'] = array(
    'callback' => 'block_admin_display_form',
  );

  return $forms;
}

/**
 * Dashboard page callback.
 *
 * @param $launch_customize
 *   Whether to launch in customization mode right away. TRUE or FALSE.
 */
function dashboard_admin($launch_customize = FALSE) {
  $js_settings = array(
    'dashboard' => array(
      'drawer' => url('admin/dashboard/drawer'),
      'blockContent' => url('admin/dashboard/block-content'),
      'updatePath' => url('admin/dashboard/update'),
      'formToken' => drupal_get_token('dashboard-update'),
      'launchCustomize' => $launch_customize,
      'dashboard' => url('admin/dashboard'),
      'emptyBlockText' => t('(empty)'),
      'emptyRegionTextInactive' => t('This dashboard region is empty. Click <em>Customize dashboard</em> to add blocks to it.'),
      'emptyRegionTextActive' => t('DRAG HERE'),
    ),
  );
  $build = array(
    '#theme' => 'dashboard_admin',
    '#message' => t('To customize the dashboard page, move blocks to the dashboard regions on the <a href="@dashboard">Dashboard administration page</a>, or enable JavaScript on this page to use the drag-and-drop interface.', array('@dashboard' => url('admin/structure/dashboard'))),
    '#access' => user_access('administer blocks'),
    '#attached' => array(
      'js' => array(
        drupal_get_path('module', 'dashboard') . '/dashboard.js',
        array('data' => $js_settings, 'type' => 'setting'),
      ),
      'library' => array(array('system', 'ui.sortable')),
    ),
  );
  return $build;
}

/**
 * Menu page callback: builds the page for administering dashboard blocks.
 *
 * This page reuses the Block module's administration form but limits editing
 * to blocks that are available to appear on the dashboard.
 *
 * @see block_admin_display()
 * @see block_admin_display_form()
 * @see dashboard_form_dashboard_admin_display_form_alter()
 * @see template_preprocess_dashboard_admin_display_form()
 */
function dashboard_admin_blocks() {
  global $theme_key;
  drupal_theme_initialize();
  drupal_set_title(t('Configure available dashboard blocks'));
  module_load_include('inc', 'block', 'block.admin');

  // Prepare the blocks for the current theme, and remove those that are
  // currently displayed in non-dashboard regions.
  // @todo This assumes the current page is being displayed using the same
  //   theme that the dashboard is displayed in.
  $blocks = block_admin_display_prepare_blocks($theme_key);
  $dashboard_regions = dashboard_region_descriptions();
  $regions_to_remove = array_diff_key(system_region_list($theme_key, REGIONS_VISIBLE), $dashboard_regions);
  foreach ($blocks as $id => $block) {
    if (isset($regions_to_remove[$block['region']])) {
      unset($blocks[$id]);
    }
  }

  // Pass in the above blocks and dashboard regions to the form, so that only
  // dashboard-related regions will be displayed.
  return drupal_get_form('dashboard_admin_display_form', $blocks, $theme_key, $dashboard_regions);
}

/**
 * Implements hook_form_FORM_ID_alter().
 */
function dashboard_form_block_admin_display_form_alter(&$form, &$form_state, $form_id) {
  // Hide dashboard regions (and any blocks placed within them) from the block
  // administration form and from the options list on that form. This
  // function is called for both the dashboard block configuration form and the
  // standard block configuration form so that both forms can share the same
  // constructor. As a result the form_id must be checked.
  if ($form_id != 'dashboard_admin_display_form') {
    $dashboard_regions = dashboard_region_descriptions();
    $form['block_regions']['#value'] = array_diff_key($form['block_regions']['#value'], $dashboard_regions);
    foreach (element_children($form['blocks']) as $i) {
      $block = &$form['blocks'][$i];
      if (isset($block['region']['#default_value']) && isset($dashboard_regions[$block['region']['#default_value']])) {
        $block['#access'] = FALSE;
      }
      elseif (isset($block['region']['#options'])) {
        $block['region']['#options'] = array_diff_key($block['region']['#options'], $dashboard_regions);
      }
    }
  }
}

/**
 * Implements hook_form_FORM_ID_alter().
 */
function dashboard_form_dashboard_admin_display_form_alter(&$form, &$form_state) {
  // Redirect the 'configure' and 'delete' links on each block back to the
  // dashboard blocks administration page.
  foreach ($form['blocks'] as &$block) {
    if (isset($block['configure']['#href'])) {
      $block['configure']['#options']['query']['destination'] = 'admin/structure/dashboard';
    }
    if (isset($block['delete']['#href'])) {
      $block['delete']['#options']['query']['destination'] = 'admin/structure/dashboard';
    }
  }
}

/**
 * Implements hook_form_FORM_ID_alter().
 */
function dashboard_form_block_admin_configure_alter(&$form, &$form_state) {
  global $theme_key;
  drupal_theme_initialize();
  // Hide the dashboard regions from the region select list on the block
  // configuration form, for all themes except the current theme (since the
  // other themes do not display the dashboard).
  // @todo This assumes the current page is being displayed using the same
  //   theme that the dashboard is displayed in.
  $dashboard_regions = dashboard_region_descriptions();
  foreach (element_children($form['regions']) as $region_name) {
    $region = &$form['regions'][$region_name];
    if ($region_name != $theme_key && isset($region['#options'])) {
      $region['#options'] = array_diff_key($region['#options'], $dashboard_regions);
    }
  }
}

/**
 * Implements hook_form_FORM_ID_alter().
 */
function dashboard_form_block_add_block_form_alter(&$form, &$form_state) {
  dashboard_form_block_admin_configure_alter($form, $form_state);
}

/**
 * Preprocesses variables for block-admin-display-form.tpl.php.
 */
function template_preprocess_dashboard_admin_display_form(&$variables) {
  template_preprocess_block_admin_display_form($variables);
}

/**
 * Determines if the dashboard should be displayed on the current page.
 *
 * This function checks if the user is currently viewing the dashboard and has
 * access to see it. It is used by other functions in the dashboard module to
 * decide whether or not the dashboard content should be displayed to the
 * current user.
 *
 * Although the menu system normally handles the above tasks, it only does so
 * for the main page content. However, the dashboard is not part of the main
 * page content, but rather is displayed in special regions of the page (so it
 * can interface with the Block module's method of managing page regions). We
 * therefore need to maintain this separate function to check the menu item for
 * us.
 *
 * @return
 *   TRUE if the dashboard should be visible on the current page, FALSE
 *   otherwise.
 *
 * @see dashboard_block_list_alter()
 * @see dashboard_page_build()
 */
function dashboard_is_visible() {
  static $is_visible;
  if (!isset($is_visible)) {
    // If the current menu item represents the page on which we want to display
    // the dashboard, and if the current user has access to see it, return
    // TRUE.
    $menu_item = menu_get_item();
    $is_visible = isset($menu_item['page_callback']) && $menu_item['page_callback'] == 'dashboard_admin' && !empty($menu_item['access']);
  }
  return $is_visible;
}

/**
 * Return an array of dashboard region descriptions, keyed by region name.
 */
function dashboard_region_descriptions() {
  $regions = module_invoke_all('dashboard_regions');
  drupal_alter('dashboard_regions', $regions);
  return $regions;
}

/**
 * Return an array of dashboard region names.
 */
function dashboard_regions() {
  $regions = &drupal_static(__FUNCTION__);
  if (!isset($regions)) {
    $regions = array_keys(dashboard_region_descriptions());
  }
  return $regions;
}

/**
 * Implements hook_dashboard_regions().
 */
function dashboard_dashboard_regions() {
  return array(
    'dashboard_main' => 'Dashboard main',
    'dashboard_sidebar' => 'Dashboard sidebar',
  );
}

/**
 * AJAX callback to show disabled blocks in the dashboard customization mode.
 */
function dashboard_show_disabled() {
  global $theme_key;

  // Blocks are not necessarily initialized at this point.
  $blocks = _block_rehash();

  // Limit the list to disabled blocks for the current theme.
  foreach ($blocks as $key => $block) {
    if ($block['theme'] != $theme_key || (!empty($block['status']) && !empty($block['region']))) {
      unset($blocks[$key]);
    }
  }

  // Theme the output and end the page request.
  print theme('dashboard_disabled_blocks', array('blocks' => $blocks));
  drupal_exit();
}

/**
 * AJAX callback to display the rendered contents of a specific block.
 *
 * @param $module
 *   The block's module name.
 * @param $delta
 *   The block's delta.
 */
function dashboard_show_block_content($module, $delta) {
  drupal_theme_initialize();
  global $theme_key;

  $blocks = array();
  $block_object = db_query("SELECT * FROM {block} WHERE theme = :theme AND module = :module AND delta = :delta", array(
    ":theme" => $theme_key,
    ":module" => $module,
    ":delta" => $delta,
    ))
    ->fetchObject();
  $block_object->enabled = $block_object->page_match = TRUE;
  $blocks[$module . "_" . $delta] = $block_object;
  $block_content = _block_render_blocks($blocks);
  $build = _block_get_renderable_array($block_content);
  $rendered_block = drupal_render($build);
  print $rendered_block;
  drupal_exit();
}

/**
 * Set the new weight of each region according to the drag-and-drop order.
 */
function dashboard_update() {
  drupal_theme_initialize();
  global $theme_key;
  // Check the form token to make sure we have a valid request.
  if (!empty($_REQUEST['form_token']) && drupal_valid_token($_REQUEST['form_token'], 'dashboard-update')) {
    parse_str($_REQUEST['regions'], $regions);
    foreach ($regions as $region_name => $blocks) {
      if ($region_name == 'disabled_blocks') {
        $region_name = '';
      }
      foreach ($blocks as $weight => $block_string) {
        // Parse the query string to determine the block's module and delta.
        preg_match('/block-([^-]+)-(.+)/', $block_string, $matches);
        $block = new stdClass();
        $block->module = $matches[1];
        $block->delta = $matches[2];

        $block->region = $region_name;
        $block->weight = $weight;
        if (empty($region_name)) {
          $block->status = 0;
        }
        else {
          $block->status = 1;
        }

        db_merge('block')
          ->key(array(
            'module' => $block->module,
            'delta' => $block->delta,
            'theme' => $theme_key,
          ))
          ->fields(array(
            'status' => $block->status,
            'weight' => $block->weight,
            'region' => $block->region,
            'pages' => '',
          ))
          ->execute();
      }
    }
    drupal_set_message(t('The configuration options have been saved.'), 'status', FALSE);
  }
  drupal_exit();
}

/**
 * Returns HTML for the entire dashboard.
 *
 * @param $variables
 *   An associative array containing:
 *   - element: A render element containing the properties of the dashboard
 *     region element, #dashboard_region and #children.
 *
 * @ingroup themeable
 */
function theme_dashboard($variables) {
  extract($variables);
  drupal_add_css(drupal_get_path('module', 'dashboard') . '/dashboard.css');
  return '<div id="dashboard">' . $element['#children'] . '</div>';
}

/**
 * Returns HTML for the non-customizable part of the dashboard page.
 *
 * @param $variables
 *   An associative array containing:
 *   - element: A render element containing a #message.
 *
 * @ingroup themeable
 */
function theme_dashboard_admin($variables) {
  // We only return a simple help message, since the actual content of the page
  // will be populated via the dashboard regions in dashboard_page_build().
  return '<div class="customize-dashboard js-hide">' . $variables['element']['#message'] . '</div>';
}

/**
 * Returns HTML for a generic dashboard region.
 *
 * @param $variables
 *   An associative array containing:
 *   - element: A render element containing the properties of the dashboard
 *     region element, #dashboard_region and #children.
 *
 * @ingroup themeable
 */
function theme_dashboard_region($variables) {
  extract($variables);
  $output = '<div id="' . $element['#dashboard_region'] . '" class="dashboard-region">';
  $output .= '<div class="region clearfix">';
  $output .= $element['#children'];
  // Closing div.region
  $output .= '</div>';
  // Closing div.dashboard-region
  $output .= '</div>';
  return $output;
}

/**
 * Returns HTML for a set of disabled blocks, for display in dashboard customization mode.
 *
 * @param $variables
 *   An associative array containing:
 *   - blocks: An array of block objects from _block_rehash().
 *
 * @ingroup themeable
 */
function theme_dashboard_disabled_blocks($variables) {
  extract($variables);
  $output = '<div class="canvas-content"><p>' . t('Drag and drop these blocks to the columns below. Changes are automatically saved. More options are available on the <a href="@dashboard-url">configuration page</a>.', array('@dashboard-url' => url('admin/structure/dashboard'))) . '</p>';
  $output .= '<div id="disabled-blocks"><div class="region disabled-blocks clearfix">';
  foreach ($blocks as $block) {
    $output .= theme('dashboard_disabled_block', array('block' => $block));
  }
  $output .= '</div></div></div>';
  return $output;
}

/**
 * Returns HTML for a disabled block, for display in dashboard customization mode.
 *
 * @param $variables
 *   An associative array containing:
 *   - block: A block object from _block_rehash().
 *
 * @ingroup themeable
 */
function theme_dashboard_disabled_block($variables) {
  extract($variables);
  $output = "";
  if (isset($block)) {
    $output .= '<div id="block-' . $block['module'] . '-' . $block['delta']
    . '" class="disabled-block block block-' . $block['module'] . '-' . $block['delta']
    . ' module-' . $block['module'] . ' delta-' . $block['delta'] . '">'
    . '<h2>' . (!empty($block['title']) && $block['title'] != '<none>' ? check_plain($block['title']) : check_plain($block['info'])) . '</h2>'
    . '<div class="content"></div>'
    . '</div>';
  }
  return $output;
}