<?php
/**
 * @file views_ui.module
 * Provide structure for the administrative interface to Views.
 */

/*
 * Implements hook_menu().
 */
function views_ui_menu() {
  $items = array();

  // Minor code reduction technique
  $base = array(
    'access callback' => 'user_access',
    'access arguments' => array('administer views'),
    'file' => 'includes/admin.inc',
  );

  $callback = $base + array('type' => MENU_CALLBACK);

  $convert = array('file' => 'includes/convert.inc') + $base;

  $items['admin/structure/views'] = $base + array(
    'title' => 'Views',
    'page callback' => 'views_ui_list_views',
    'description' => 'Views are customized lists of content on your system; they are highly configurable and give you control over how lists of content are presented.',
    'type' => MENU_NORMAL_ITEM
  );
  $items['admin/structure/views/list'] = $base + array(
    'title' => 'List',
    'page callback' => 'views_ui_list_views',
    'type' => MENU_DEFAULT_LOCAL_TASK,
    'weight' => '-1'
  );
  $items['admin/structure/views/add'] = $base + array(
    'title' => 'Add new view',
    'page callback' => 'views_ui_add_page',
    'type' => MENU_LOCAL_ACTION,
  );
  $items['admin/structure/views/import'] = array(
    'title' => 'Import view from code',
    'page callback' => 'drupal_get_form',
    'page arguments' => array('views_ui_import_page'),
    'access callback' => 'views_import_access',
    'type' => MENU_LOCAL_ACTION,
  ) + $base;
  $items['admin/structure/views/tools'] = $base + array(
    'title' => 'Tools',
    'page callback' => 'drupal_get_form',
    'page arguments' => array('views_ui_admin_tools'),
    'type' => MENU_LOCAL_TASK
  );
  $items['admin/structure/views/tools/basic'] = $base + array(
    'title' => 'Basic',
    'page callback' => 'drupal_get_form',
    'page arguments' => array('views_ui_admin_tools'),
    'type' => MENU_DEFAULT_LOCAL_TASK,
    'weight' => -10,
  );

  $items['admin/structure/views/tools/convert'] = $convert + array(
    'title' => 'Convert',
    'description' => 'Convert stored Views 1 views.',
    'page callback' => 'views_ui_admin_convert',
    'type' => MENU_LOCAL_TASK,
    'weight' => 1,
  );
  $items['admin/structure/views1/delete'] = $convert + array(
    'title' => 'Delete view',
    'page callback' => 'drupal_get_form',
    'page arguments' => array('views_ui_delete1_confirm', 4),
    'type' => MENU_CALLBACK,
  );
  $items['admin/structure/views1/convert'] = $convert + array(
    'title' => 'Convert view',
    'page callback' => 'views_ui_convert1',
    'page arguments' => array(4),
    'type' => MENU_CALLBACK,
  );

  $items['admin/structure/views/delete/%views_ui_cache'] = $callback + array(
    'title' => 'Delete view',
    'page callback' => 'drupal_get_form',
    'page arguments' => array('views_ui_delete_confirm', 4),
  );
  $items['admin/structure/views/break-lock/%views_ui_cache'] = $callback + array(
    'title' => 'Delete view',
    'page callback' => 'drupal_get_form',
    'page arguments' => array('views_ui_break_lock_confirm', 4),
  );
  $items['admin/structure/views/export/%views_ui_cache'] = $callback + array(
    'page callback' => 'drupal_get_form',
    'page arguments' => array('views_ui_export_page', 4),
    'type' => MENU_LOCAL_TASK
  );
  $items['admin/structure/views/clone/%views_ui_cache'] = $callback + array(
    'page callback' => 'views_ui_clone_page',
    'page arguments' => array(4),
    'type' => MENU_LOCAL_TASK
  );
  $items['admin/structure/views/enable/%views_ui_default'] = $callback + array(
    'page callback' => 'views_ui_enable_page',
    'page arguments' => array(4),
  );
  $items['admin/structure/views/disable/%views_ui_default'] = $callback + array(
    'page callback' => 'views_ui_disable_page',
    'page arguments' => array(4),
  );

  // Many line items for editing a view.
  $items['admin/structure/views/edit/%views_ui_cache'] = $base + array(
    'title' => 'Edit',
    'page callback' => 'views_ui_edit_page',
    'page arguments' => array(4),
    'type' => MENU_LOCAL_TASK
  );
  $ajax_callbacks = array(
    'analyze' => 'views_ui_analyze_view',
    'add-display' => 'views_ui_add_display',
    'preview' => 'views_ui_preview',
    'reorder-displays' => 'views_ui_reorder_view',
  );

  foreach ($ajax_callbacks as $menu => $menu_callback) {
    $items['admin/structure/views/nojs/' . $menu . '/%views_ui_cache'] = $callback + array(
      'page callback' => $menu_callback,
      'page arguments' => array(FALSE, 5),
    );
    $items['admin/structure/views/ajax/' . $menu . '/%views_ui_cache'] = $callback + array(
      'page callback' => $menu_callback,
      'page arguments' => array(TRUE, 5),
      'delivery callback' => 'views_ui_ajax_deliver',
    );
  }

  $items['admin/structure/views/nojs/human_name/%views_ui_cache'] = $callback + array(
    'page callback' => 'views_ui_edit_details',
    'page arguments' => array('human_name', FALSE, 5),
  );
  $items['admin/structure/views/ajax/human_name/%views_ui_cache'] = $callback + array(
    'page callback' => 'views_ui_edit_details',
    'page arguments' => array('human_name', TRUE, 5),
    'delivery callback' => 'views_ui_ajax_deliver',
  );
  $items['admin/structure/views/nojs/tag/%views_ui_cache'] = $callback + array(
    'page callback' => 'views_ui_edit_details',
    'page arguments' => array('tag', FALSE, 5),
  );
  $items['admin/structure/views/ajax/tag/%views_ui_cache'] = $callback + array(
    'page callback' => 'views_ui_edit_details',
    'page arguments' => array('tag', TRUE, 5),
    'delivery callback' => 'views_ui_ajax_deliver',
  );
  $items['admin/structure/views/nojs/description/%views_ui_cache'] = $callback + array(
    'page callback' => 'views_ui_edit_details',
    'page arguments' => array('description', FALSE, 5),
  );
  $items['admin/structure/views/ajax/description/%views_ui_cache'] = $callback + array(
    'page callback' => 'views_ui_edit_details',
    'page arguments' => array('description', TRUE, 5),
    'delivery callback' => 'views_ui_ajax_deliver',
  );

  $items['admin/build/views/nojs/clone-display/%views_ui_cache'] = $callback + array(
    'page callback' => 'views_ui_clone_display',
    'page arguments' => array(FALSE, 5, 6),
  );

  $items['admin/build/views/ajax/clone-display/%views_ui_cache'] = $callback + array(
    'page callback' => 'views_ui_clone_display',
    'page arguments' => array(TRUE, 5, 6),
    'delivery callback' => 'views_ui_ajax_deliver',
  );

  $items['admin/structure/views/nojs/%/%views_ui_cache'] = $callback + array(
    'page callback' => 'views_ui_ajax_form',
    'page arguments' => array(FALSE, 4, 5),
  );
  $items['admin/structure/views/ajax/%/%views_ui_cache'] = $callback + array(
    'page callback' => 'views_ui_ajax_form',
    'page arguments' => array(TRUE, 4, 5),
    'delivery callback' => 'views_ui_ajax_deliver',
  );

  // autocompletes for handlers and such
  $items['admin/views/ajax/autocomplete/tag'] = $callback + array(
    'page callback' => 'views_ui_autocomplete_tag',
    'access arguments' => array('administer views'),
    'type' => MENU_CALLBACK,
    'file' => 'includes/admin.inc',
  );

  return $items;
}

/*
 * Implements hook_help().
 */
function views_ui_help($path, $arg = '') {
  switch ($path) {
    case 'admin/structure/views/tools/convert':
      return '<p>' . t('The converter will make a best-effort attempt to convert a Views 1 view to Views 2. This conversion is not reliable; you will very likely have to make adjustments to your view to get it to match. You can import Views 1 views through the normal Import tab.') . '</p>';
  }
}

/*
 * Implements hook_theme().
 */
function views_ui_theme() {
  $path = drupal_get_path('module', 'views');
  require_once DRUPAL_ROOT . "/$path/includes/admin.inc";

  return array(
    // edit a view
    'views_ui_edit_view' => array(
      'variables' => array('view' => NULL),
      'template' => 'views-ui-edit-view',
      'path' => "$path/theme",
    ),
    'views_ui_edit_tab' => array(
      'variables' => array('view' => NULL, 'display' => NULL),
      'template' => 'views-ui-edit-tab',
      'path' => "$path/theme",
    ),
    'views_ui_edit_item' => array(
      'variables' => array('type' => NULL, 'view' => NULL, 'display' => NULL, 'no_fields' => FALSE),
      'template' => 'views-ui-edit-item',
      'path' => "$path/theme",
    ),
    'views_ui_rearrange_form' => array(
      'render element' => 'form',
    ),
    'views_ui_rearrange_filter_form' => array(
      'render element' => 'form',
      'file' => 'includes/admin.inc',
    ),

    // list views
    'views_ui_list_views' => array(
      'variables' => array(
        'views' => array(),
        'help' => '',
        'widgets' => '',
        'help_type_icon' => '',
      ),
      'template' => 'views-ui-list-views',
      'path' => "$path/theme",
    ),

    // tab themes
    'views_tabset' => array(
      'variables' => array('tabs' => NULL),
    ),
    'views_tab' => array(
      'variables' => array('body' => NULL),
    ),
    'views_ui_reorder_displays_form' => array(
      'render element' => 'form',
      'file' => 'includes/admin.inc',
    ),


    // On behalf of a plugin
    'views_ui_style_plugin_table' => array(
      'render element' => 'form',
    ),
  );
}

/**
 * Specialized menu callback to load a view either out of the cache or just
 * load it.
 */
function views_ui_cache_load($name) {
  ctools_include('object-cache');
  views_include('view');
  $view = ctools_object_cache_get('view', $name);

  if (empty($view)) {
    $view = views_get_view($name);

    if (!empty($view)) {
      // Check to see if someone else is already editing this view.
      $view->locked = ctools_object_cache_test('view', $view->name);
      // Set a flag to indicate that this view is being edited.
      // This flag will be used e.g. to determine whether strings
      // should be localized.
      $view->editing = TRUE;
    }
  }

  if (empty($view)) {
    return FALSE;
  }

  else {
    return $view;
  }
}

/**
 * Specialized cache function to add a flag to our view, include an appropriate
 * include, and cache more easily.
 */
function views_ui_cache_set(&$view) {
  if (!empty($view->locked)) {
    drupal_set_message(t('Changes cannot be made to a locked view.'), 'error');
    return;
  }
  ctools_include('object-cache');
  $view->changed = TRUE; // let any future object know that this view has changed.

  // Unset handlers; we don't want to write these into the cache
  unset($view->display_handler);
  unset($view->current_display);
  unset($view->default_display);
  $view->query = NULL;
  foreach (array_keys($view->display) as $id) {
    unset($view->display[$id]->handler);
    unset($view->display[$id]->default_display);
  }
  ctools_object_cache_set('view', $view->name, $view);
}


/**
 * Specialized menu callback to load a view that is only a default
 * view.
 */
function views_ui_default_load($name) {
  $view = views_get_view($name);
  if ($view->type == t('Default')) {
    return $view;
  }

  return FALSE;
}

/**
 * Package and send the result of a page callback to the browser as an AJAX
 * response, and add the HTML.
 *
 * @param $page_callback_result
 *   The result of a page callback. Can be one of:
 *   - NULL: to indicate no content.
 *   - An integer menu status constant: to indicate an error condition.
 *   - A string of HTML content.
 *   - A renderable array of content.
 */
function views_ui_ajax_deliver($page_callback_result) {
  $commands = array();
  $header = TRUE;

  if (!isset($page_callback_result)) {
    // Simply delivering an empty commands array is sufficient. This results
    // in the AJAX request being completed, but nothing being done to the page.
  }
  elseif (is_int($page_callback_result)) {
    switch ($page_callback_result) {
      case MENU_NOT_FOUND:
        $commands[] = ajax_command_alert(t('The requested page could not be found.'));
        break;

      case MENU_ACCESS_DENIED:
        $commands[] = ajax_command_alert(t('You are not authorized to access this page.'));
        break;

      case MENU_SITE_OFFLINE:
        $commands[] = ajax_command_alert(filter_xss_admin(variable_get('maintenance_mode_message',
          t('@site is currently under maintenance. We should be back shortly. Thank you for your patience.', array('@site' => variable_get('site_name', 'Drupal'))))));
        break;
    }
  }
  elseif (is_array($page_callback_result) && isset($page_callback_result['#type']) && ($page_callback_result['#type'] == 'ajax')) {
    // Complex AJAX callbacks can return a result that contains an error message
    // or a specific set of commands to send to the browser.
    $page_callback_result += element_info('ajax');
    $header = $page_callback_result['#header'];
    $error = $page_callback_result['#error'];
    if (isset($error) && $error !== FALSE) {
      if ((empty($error) || $error === TRUE)) {
        $error = t('An error occurred while handling the request: The server received invalid input.');
      }
      $commands[] = ajax_command_alert($error);
    }
    else {
      $commands = $page_callback_result['#commands'];
    }
  }
  else {
    // Like normal page callbacks, simple AJAX callbacks can return html
    // content, as a string or renderable array, to replace what was previously
    // there in the wrapper. In this case, in addition to the content, we want
    // to add the status messages, but inside the new wrapper, so that they get
    // replaced on subsequent AJAX calls for the same wrapper.
    $html = is_string($page_callback_result) ? $page_callback_result : drupal_render($page_callback_result);
    $commands[] = ajax_command_replace(NULL, $html);
    $commands[] = ajax_command_prepend(NULL, theme('status_messages'));
  }

  // This function needs to do the same thing that drupal_deliver_html_page()
  // does: add any needed http headers, print rendered output, and perform
  // end-of-request tasks. By default, $header=TRUE, and we add a
  // 'text/javascript' header. The page callback can override $header by
  // returning an 'ajax' element with a #header property. This can be set to
  // FALSE to prevent the 'text/javascript' header from being output, necessary
  // when outputting to an IFRAME. This can also be set to 'multipart', in which
  // case, we don't output JSON, but JSON content wrapped in a textarea, making
  // a 'text/javascript' header incorrect.
  if ($header && $header !== 'multipart') {
    drupal_add_http_header('Content-Type', 'text/javascript; charset=utf-8');
  }
  $output = ajax_render($commands);
  if ($header === 'multipart') {
    // jQuery file uploads: http://malsup.com/jquery/form/#code-samples
    $output = '<textarea>' . $output . '</textarea>';
  }
  print $output;
  ajax_footer();
}