<?php

/**
 * @file
 * 
 * This module provides support for "Profile Tabs" which can be added to both
 * user profiles and facebook pages.
 *
 * http://developers.facebook.com/docs/guides/canvas/#tabs
 *
 */

function fb_tab_fb($op, $data, &$return) {
  $fb = isset($data['fb']) ? $data['fb'] : NULL;
  $fb_app = isset($data['fb_app']) ? $data['fb_app'] : NULL;
  
  if ($op == FB_OP_POST_INIT) {
    // Include our admin hooks.
    if (fb_is_fb_admin_page()) {
      require drupal_get_path('module', 'fb_tab') . '/fb_tab.admin.inc';
    }
  }
  elseif ($op == FB_OP_CURRENT_APP) {
    if (fb_is_tab()) {
      $return = fb_get_app(array('apikey' => $_REQUEST['fb_sig_api_key']));
    }
  }
  elseif ($op == FB_OP_INITIALIZE) {
    if (fb_is_tab()) {
      $config = _fb_tab_get_config($fb_app);
      if (!isset($GLOBALS['custom_theme'])) {
        $GLOBALS['custom_theme'] = $config['custom_theme'];
      }
    }
  }
}

/**
 * Implements fb_tab_form_alter.
 */
function fb_tab_form_alter(&$form, &$form_state, $form_id) {
  if (isset($form['fb_app_data']) && is_array($form['fb_app_data'])) {
    // Add our settings to the fb_app edit form.
    //require 'fb_canvas.admin.inc';
    fb_tab_admin_form_alter($form, $form_state, $form_id);
  }
}


/**
 * Helper returns configuration for this module, on a per-app basis.
 */
function _fb_tab_get_config($fb_app) {
  $fb_app_data = fb_get_app_data($fb_app);
  $config = isset($fb_app_data['fb_tab']) ? $fb_app_data['fb_tab'] : array();
  
  // Merge in defaults
  $config += array(
    'custom_theme' => NULL,
    'tab_default_name' => NULL,
    'profile_tab_url' => NULL,
  );
  return $config;
}