<?php
/**
 * @file
 * Adds the OneAll Social Login widget at the locations
 * chosen by the administrator.
 */

/**
 * Adds the javascript library.
 */
function oneall_social_login_widget_add_js_library($subdomain, $https_enabled = FALSE) {
  drupal_add_js(($https_enabled ? 'https' : 'http') . '://' . $subdomain . '.api.oneall.com/socialize/library.js', 'external');
}

/**
 * Adds the social network buttons.
 */
function oneall_social_login_widget_add_js_plugin($plugin_type, $subdomain, $providers, $containerid, $token = NULL) {
  global $is_https, $base_url;

  // Check required settings.
  if (!empty($containerid) AND !empty($subdomain)) {

    // Build the callback uri.
    $current_uri = oneall_social_login_get_current_url();
    $callback_uri = url('oneall_social_login/callback', array('absolute' => TRUE, 'query' => array('origin' => $current_uri)));

    // Add social library.
    oneall_social_login_widget_add_js_library($subdomain, $is_https);

    // Build Javascript.
    $js = array();
    $js[] = "oneall.api.plugins." . $plugin_type . ".build(\"" . $containerid . "\", {";
    $js[] = " 'providers' : ['" . implode("','", $providers) . "'],";
    $js[] = " 'callback_uri': '" . $callback_uri . "', ";
    $js[] = " 'force_reauth' : " . ($plugin_type == 'social_link' ? 'true' : 'false') . ", ";
    $js[] = " 'user_token': '" . (!empty($token) ? $token : '') . "', ";
    $js[] = " 'css_theme_uri' : '" . (($is_https ? 'https://secure.' : ' http://public.') . 'oneallcdn.com/css/api/socialize/themes/drupal/default.css') . "' ";
    $js[] = "}); <!-- OneAll.com / " . ucwords(str_replace("_", " ", $plugin_type)) . " for Drupal -->";
    $js = implode("\n", $js);

    // Add login buttons.
    drupal_add_js($js, array('type' => 'inline', 'scope' => 'footer'));
  }
}

/**
 * Returns the current url.
 */
function oneall_social_login_get_current_url($https_enabled = FALSE) {
  $request_uri = ((!isset($_SERVER['REQUEST_URI'])) ? $_SERVER['PHP_SELF'] : $_SERVER['REQUEST_URI']);
  $request_port = ((!empty($_SERVER['SERVER_PORT']) AND $_SERVER['SERVER_PORT'] <> '80') ? (":" . $_SERVER['SERVER_PORT']) : '');
  $request_protocol = ($https_enabled ? 'https' : 'http') . "://";
  $redirect_to = $request_protocol . $_SERVER['SERVER_NAME'] . $request_port . $request_uri;
  return $redirect_to;
}

/**
 * Implements hook_block_info().
 */
function oneall_social_login_widget_block_info() {
  $blocks['oneall_social_login_widget'] = array(
    'info' => t('OneAll Social Login'),
    'weight' => 0,
  );
  return $blocks;
}


/**
 * Implements hook_block_view().
 */
function oneall_social_login_widget_block_view($delta = '') {
  $block = array();
  if ($delta == 'oneall_social_login_widget') {

    // Read Settings.
    $settings = oneall_social_login_widget_get_settings();

    // Read User.
    global $user;

    // Hide the block for logged in users.
    if (empty($user->uid) OR $settings['block_icons_loggedin'] <> 'hide') {
      // Container to add the buttons to.
      $containerid = 'oneall_social_login_providers_' . rand(99999, 9999999);

      // Add Javascript.
      oneall_social_login_widget_add_js_plugin('social_login', $settings['api_subdomain'], $settings['enabled_providers'], $containerid);

      // Setup Block.
      $block['subject'] = t('Login with your Social Network account.');
      $block['content'] = theme('oneall_social_login_widget_provider_container_block', array('containerid' => $containerid));
    }
  }
  return $block;
}


/**
 * Implements hook_form_alter().
 */
function oneall_social_login_widget_form_alter(&$form, &$form_state) {

  switch ($form['#form_id']) {
    // Hook into login page.
    case 'user_login':
      oneall_social_login_widget_show_providers($form, $form_state, 'login_page');
      break;

    // Hook into edit profile page.
    case 'user_profile_form':
      oneall_social_login_widget_show_providers($form, $form_state, 'edit_profile_page');
      break;

    // Hook into registration page.
    default:
      if (isset($form['#user_category']) && $form['#user_category'] == 'register') {
        oneall_social_login_widget_show_providers($form, $form_state, 'registration_page');
      }
      break;
  }
}


/**
 * Implements hook_form_USER_LOGIN_BLOCK_alter().
 */
function oneall_social_login_widget_form_user_login_block_alter(&$form, &$form_state) {
  oneall_social_login_widget_show_providers($form, $form_state, 'side_panel');
}


/**
 * Generic function called to display the social providers.
 */
function oneall_social_login_widget_show_providers(&$form, &$form_state, $target) {

  // Read Settings.
  $settings = oneall_social_login_widget_get_settings();

  // Enabled?
  $widget_enabled = FALSE;

  // Show in fieldset?
  $widget_in_fieldset = FALSE;

  // Unique token.
  $token = '';

  // Where are the buttons shown?
  switch ($target) {
    // Side Panel.
    case 'side_panel':
      $plugin_type = 'social_login';

      // Do not show if disabled by admin.
      if ($settings['side_panel_icons'] <> 'disable') {
        $widget_enabled = TRUE;
        $title = $settings['side_panel_caption'];
        $position = ($settings['side_panel_icons'] == 'below' ? 100 : (-100));
      }
      break;

    // Registration Page.
    case 'registration_page':
      $plugin_type = 'social_login';

      // Do not show if there is already a session.
      if (empty($_SESSION['oneall_social_login_session_open'])) {
        // Do not show if disabled by admin.
        if ($settings['registration_page_icons'] <> 'disable') {
          $widget_enabled = TRUE;
          $title = $settings['registration_page_caption'];
          $position = ($settings['registration_page_icons'] == 'below' ? 100 : (-100));
        }
      }
      break;

    // Login Page.
    case 'login_page':
      $plugin_type = 'social_login';

      // Do not show if there is already a session.
      if (empty($_SESSION['oneall_social_login_session_open'])) {
        // Do not show if disabled by admin.
        if ($settings['login_page_icons'] <> 'disable') {
          $widget_enabled = TRUE;
          $title = $settings['login_page_caption'];
          $position = ($settings['login_page_icons'] == 'above' ? -100 : 100);
        }
      }
      break;

    // Edit Profile Page.
    case 'edit_profile_page':
      if ($settings['profile_page_icons'] <> 'disable') {
        // Needed to retrieve his token.
        global $user;

        // Unique token.
        $token = oneall_social_login_core_get_user_token_for_uid($user->uid);

        // Type of plugin.
        $plugin_type = 'social_link';

        // Enable Widget.
        $widget_enabled = TRUE;

        // Show in fieldset.
        $widget_in_fieldset = TRUE;

        // Title.
        $title = $settings['profile_page_caption'];

        // Display on top.
        $position = ($settings['profile_page_icons'] == 'above' ? -100 : 100);
      }
      break;

    // Unkown.
    default:
      $plugin_type = 'social_login';

      // Widget is enabled.
      $widget_enabled = TRUE;

      // Default title.
      $title = t('Login with');

      // Display on botton.
      $position = 100;
      break;
  }

  // Enabled.
  if ($widget_enabled === TRUE) {
    // Container to add the buttons to.
    $containerid = 'oneall_social_login_providers_' . rand(99999, 9999999);

    // Add javascript to display the plugin.
    oneall_social_login_widget_add_js_plugin($plugin_type, $settings['api_subdomain'], $settings['enabled_providers'], $containerid, $token);

    // Show in fieldset.
    if ($widget_in_fieldset) {
      $form['oneall_social_login_' . $containerid] = array(
        '#type' => 'fieldset',
        '#title' => $title,
        '#weight' => $position,
      );
      $form['oneall_social_login_' . $containerid]['inner_block'] = array(
        '#prefix' => theme('oneall_social_login_widget_provider_container', array('containerid' => $containerid, 'label' => '')),
      );
    }
    else {
      $form['oneall_social_login_' . $containerid] = array(
        '#prefix' => theme('oneall_social_login_widget_provider_container', array('containerid' => $containerid, 'label' => $title)),
        '#weight' => $position,
      );
    }
  }
}


/**
 * Implements hook_theme().
 */
function oneall_social_login_widget_theme() {
  return array(
    'oneall_social_login_widget_provider_container' => array(
      'template' => 'provider_container',
      'path' => drupal_get_path('module', 'oneall_social_login_widget') . '/theme',
      'variables' => array(
        'containerid' => NULL,
        'label' => NULL,
      ),
    ),
    'oneall_social_login_widget_provider_container_block' => array(
      'template' => 'block_provider_container',
      'path' => drupal_get_path('module', 'oneall_social_login_widget') . '/theme',
      'variables' => array(
        'containerid' => NULL,
      ),
    ),
  );
}


/**
 * Returns the settings.
 */
function oneall_social_login_widget_get_settings() {

  // Container.
  $settings = array();
  $settings['enabled_providers'] = array();

  // Default values.
  $settings['api_subdomain'] = '';
  $settings['api_key'] = '';
  $settings['api_secret'] = '';

  $settings['http_handler'] = 'curl';
  $settings['http_protocol'] = 'https';

  $settings['side_panel_icons'] = 'below';
  $settings['side_panel_caption'] = '';

  $settings['registration_page_icons'] = 'below';
  $settings['registration_page_caption'] = '';

  $settings['registration_retrieve_avatars'] = 'enable';
  $settings['registration_approval'] = 'inherit';
  $settings['registration_method'] = 'manual';

  $settings['login_page_icons'] = 'above';
  $settings['login_page_caption'] = '';

  $settings['profile_page_icons'] = 'below';
  $settings['profile_page_caption'] = '';

  $settings['block_icons_loggedin'] = 'hide';

  // Read settings.
  $results = db_query("SELECT setting, value FROM {oneall_social_login_settings}");
  foreach ($results as $result) {
    $settings[$result->setting] = $result->value;
    if (drupal_substr($result->setting, 0, 8) == 'provider' && !empty($result->value)) {
      $settings['enabled_providers'][] = drupal_substr($result->setting, 9, drupal_strlen($result->setting));
    }
  }
  return $settings;
}