<?php

function fb_devel_menu($may_cache) {
  $items = array();

  if ($may_cache) {
    $items[] = array('path' => 'fb/debug',
                     'callback' => '_fb_debug_cb',
                     'type' => MENU_CALLBACK,
                     'access' => TRUE, // TODO: restrict access
    );
    
  }
  return $items;
  }


function fb_devel_fb($fb, $fb_app, $op, &$return, $data) {
  if ($op == FB_OP_INITIALIZE) {
    // Sanity check.
    $nid = fb_settings(FB_SETTINGS_APP_NID);
    if ($nid != $fb_app->nid) {
      $message = t('fb_app id (%fb_app_id) does not equal fb settings id (%fb_settings_id).  This is usually caused by the wrong callback url on your <a href="!url">facebook application settings form</a>.',
                   array('%fb_app_id' => $fb_app->nid,
                         '%fb_settings_id' => $nid,
                         '!url' => "http://www.facebook.com/developers/apps.php",
                   ));
      drupal_set_message($message, 'error');
      watchdog('fb_devel', $message);
    }

    // Theme sanity check
    global $theme; // for debug message
    if (isset($theme)) {
      $message = t('Drupal for Facebook is unable to override the theme settings.  This is usually because some module causes theme_init() to be invoked before fb_init().  See the !readme.',
                   array('!drupal_for_facebook' => l(t('Drupal for Facebook'), 'http://drupal.org/project/fb'),
                         // This link should work with clean URLs
                         // disabled.
                         '!readme' => '<a href='.base_path() . '/' . drupal_get_path('module', 'fb') . '/README.txt>README.txt</a>'));
      drupal_set_message($message, 'error');
      watchdog('fb_devel', $message);      
    }

  }
}

/**
 * Provides a page with useful debug info.
 * 
 */
function _fb_debug_cb() {
  global $fb, $fb_app;
  global $user;

  if ($_REQUEST['require_login'])
    $fb->require_login();
  else if ($_REQUEST['require_add'])
    $fb->require_add();
  
  if ($fb) {
    // These will work in a canvas page.
    drupal_set_message("in_fb_canvas returns " . $fb->in_fb_canvas());
    drupal_set_message("get_loggedin_user returns " . $fb->get_loggedin_user());
    drupal_set_message("current_url returns " . $fb->current_url());
    
    drupal_set_message("base_url: " . $GLOBALS['base_url']);
    drupal_set_message("base_path: " . $GLOBALS['base_path']);
    drupal_set_message("session_key is " . $fb->api_client->session_key);
  }

  dpm(fb_get_fbu($user), 'Facebook user via fb_get_fbu');
  dpm($user, "Local user " . theme('username', $user));
  
  dpm($_COOKIE, 'cookie');
  dpm($_REQUEST, "Request");
  dpm($fb_app, "fb_app");
  drupal_set_message("session_id returns " . session_id());
  dpm($_SESSION, "session:");

  return "This is the facebook debug page.";
}


function fb_devel_block($op = 'list', $delta = 0, $edit = array()) {
  if ($op == 'list') {
    $items[0]['info'] = t('Facebook Devel Canvas Page Info');
    return $items;
  }
  else if ($op == 'view') {
    return array('subject' => t('Facebook Devel Canvas Page'),
                 'content' => drupal_get_form('fb_devel_canvas_info'));
  }
}

function fb_devel_canvas_info() {
  global $fb, $fb_app;
  global $user;
  global $base_url;
  global $base_path;

  $info = array();
  
  if ($fb) {
    if ($fb->in_fb_canvas())
      $info['Page Status'] = t('Rendering FBML canvas page.');
    else if ($fb->in_frame()) {
      $info['Page Status'] = t('Rendering iframe.');
    }
    else {
      // Followed a link from within an iframe.
      $info['Page Status'] = t('Global fb instance is set (followed link in iframe).');
    }
    $info['fb_facebook_user'] = fb_facebook_user();
  }
  else {
    $info['Page Status'] = t('Appears not to be a canvas page.');
  }
  $info['local user'] = theme('username', $user);
  $info['fb_get_fbu'] = fb_get_fbu($user->uid);
  $info['base_url'] = $base_url;
  $info['base_path'] = $base_path;
  $info['url() returns'] = url();
  $info['session_id'] = session_id();
  $info['session_name'] = session_name();

  $info['request'] = $_REQUEST;
  $info['fb_app'] = $fb_app;
  $info['session'] = $_SESSION;

  $form = array();
  foreach ($info as $key => $val) {
    if (is_string($val) || is_numeric($val) || !$val) {
      $form[] = array('#value' => t($key) . ' = ' . $val,
                      '#weight' => count($form),
                      '#suffix' => '<br/>',
      );
      
    }
    else {
      $form[] = array('#type' => 'fieldset',
                      '#title' => t($key),
                      '#collapsible' => TRUE,
                      '#collapsed' => TRUE,
                      '#weight' => count($form),
                      'value' => array('#value' => dprint_r($val, 1)),
      );
    }
  }
  // It's not really a form, but we like collapsible fieldsets
  return $form;
}

?>