public function __construct()
 {
     session_start();
     header('Content-type: text/json');
     // Get the website user
     $userId = SessionManager::getInstance()->getUserId();
     $json['result'] = 'true';
     // Make sure a user is logged in
     if (!isset($userId)) {
         $json['result'] = 'false';
         $json['title'] = (string) Content::c()->errors->session->title;
         $json['message'] = (string) Content::c()->errors->session->no_session;
         echo json_encode($json);
         exit;
     }
     // Validate input
     if (empty($_POST['introducee1Name']) || empty($_POST['introducee1FacebookId']) && empty($_POST['introducee1LinkedInId']) && empty($_POST['introducee1TwitterId']) || empty($_POST['introducee2Name']) || empty($_POST['introducee2FacebookId']) && empty($_POST['introducee2LinkedInId']) && empty($_POST['introducee2TwitterId'])) {
         $json['result'] = 'false';
         $json['title'] = (string) Content::c()->errors->input->title;
         $json['message'] = (string) Content::c()->errors->input->introduction_not_created;
         echo json_encode($json);
         exit;
     }
     // Make sure the introducees are unique
     if (!empty($_POST['introducee1FacebookId']) && !empty($_POST['introducee2FacebookId']) && $_POST['introducee1FacebookId'] == $_POST['introducee2FacebookId'] || !empty($_POST['introducee1LinkedInId']) && !empty($_POST['introducee2LinkedInId']) && $_POST['introducee1LinkedInId'] == $_POST['introducee2LinkedInId'] || !empty($_POST['introducee1TwitterId']) && !empty($_POST['introducee2TwitterId']) && $_POST['introducee1TwitterId'] == $_POST['introducee2TwitterId']) {
         $json['result'] = 'false';
         $json['title'] = (string) Content::c()->errors->input->title;
         $json['message'] = (string) Content::c()->errors->input->introduce_to_self;
         echo json_encode($json);
         exit;
     }
     // Connect to the database
     $db = Database::getInstance();
     $introducee1 = new Person(array('name' => $_POST['introducee1Name'], 'facebookId' => !empty($_POST['introducee1FacebookId']) ? $_POST['introducee1FacebookId'] : '', 'linkedInId' => !empty($_POST['introducee1LinkedInId']) ? $_POST['introducee1LinkedInId'] : null, 'twitterId' => !empty($_POST['introducee1TwitterId']) ? $_POST['introducee1TwitterId'] : null));
     $introducee2 = new Person(array('name' => $_POST['introducee2Name'], 'facebookId' => !empty($_POST['introducee2FacebookId']) ? $_POST['introducee2FacebookId'] : '', 'linkedInId' => !empty($_POST['introducee2LinkedInId']) ? $_POST['introducee2LinkedInId'] : null, 'twitterId' => !empty($_POST['introducee2TwitterId']) ? $_POST['introducee2TwitterId'] : null));
     // See if the introducees are already in our database, that would be nice!
     if (!empty($_POST['introducee1FacebookId'])) {
         $introducee1->getDataFromFacebookId($_POST['introducee1FacebookId']);
     } elseif (!empty($_POST['introducee1LinkedInId'])) {
         $introducee1->getDataFromLinkedInId($_POST['introducee1LinkedInId']);
     } elseif (!empty($_POST['introducee1TwitterId'])) {
         $introducee1->getDataFromTwitterId($_POST['introducee1TwitterId']);
     }
     if (!empty($_POST['introducee2FacebookId'])) {
         $introducee2->getDataFromFacebookId($_POST['introducee2FacebookId']);
     } elseif (!empty($_POST['introducee2LinkedInId'])) {
         $introducee2->getDataFromLinkedInId($_POST['introducee2LinkedInId']);
     } elseif (!empty($_POST['introducee2TwitterId'])) {
         $introducee2->getDataFromTwitterId($_POST['introducee2TwitterId']);
     }
     // Make sure the introducees are still unique
     if ($introducee1->getFacebookId() != null && $introducee1->getFacebookId() == $introducee2->getFacebookId() || $introducee1->getLinkedInId() != null && $introducee1->getLinkedInId() == $introducee2->getLinkedInId() || $introducee1->getTwitterId() != null && $introducee1->getTwitterId() == $introducee2->getTwitterId()) {
         $json['result'] = 'false';
         $json['title'] = (string) Content::c()->errors->input->title;
         $json['message'] = (string) Content::c()->errors->input->introduce_to_self;
         echo json_encode($json);
         exit;
     }
     // If the introducees aren't in the database yet, add them
     $introducee1->addToDatabase();
     $introducee2->addToDatabase();
     // If the introducees are on LinkedIn, add their public profile URL and picture to the DB
     if ($introducee1->getLinkedInId() != null || $introducee2->getLinkedInId() != null) {
         // Connect to LinkedIn API
         $sth = $db->prepare('SELECT id, access_token FROM linkedin WHERE person_id = :person_id');
         $sth->execute(array(':person_id' => $userId));
         $userDetails = $sth->fetch(PDO::FETCH_ASSOC);
         if (!empty($userDetails['access_token'])) {
             $linkedInAccessToken = $userDetails['access_token'];
             // Create LinkedIn object
             $API_CONFIG = array('appKey' => LI_API_KEY, 'appSecret' => LI_SECRET, 'callbackUrl' => '');
             $OBJ_linkedin = new LinkedIn($API_CONFIG);
             $OBJ_linkedin->setTokenAccess(unserialize($linkedInAccessToken));
             // Which introducees are on LinkedIn?
             $profilesToRequest = array();
             if ($introducee1->getLinkedInId() != null) {
                 $profilesToRequest[] = 'id=' . $introducee1->getLinkedInId();
             }
             if ($introducee2->getLinkedInId() != null) {
                 $profilesToRequest[] = 'id=' . $introducee2->getLinkedInId();
             }
             try {
                 $linkedInProfiles = $OBJ_linkedin->profileNew('::(' . implode(',', $profilesToRequest) . '):(id,public-profile-url,picture-url)');
             } catch (ErrorException $e) {
             }
             if ($linkedInProfiles['success'] === TRUE) {
                 $linkedInProfiles['linkedin'] = new SimpleXMLElement($linkedInProfiles['linkedin']);
                 if ($linkedInProfiles['linkedin']->getName() == 'people') {
                     foreach ($linkedInProfiles['linkedin']->person as $person) {
                         $id = (string) $person->id;
                         $url = (string) $person->{'public-profile-url'};
                         $pic = (string) $person->{'picture-url'};
                         if ($id && ($url || $pic)) {
                             $update = $db->prepare('REPLACE INTO temp_linkedin SET linkedin_id = :linkedin_id, time=NOW(), profile_url = :profile_url, picture_url = :picture_url');
                             $update->execute(array(':linkedin_id' => $id, ':profile_url' => $url, ':picture_url' => $pic));
                         }
                     }
                 }
             }
         }
     }
     // If the introducees are on Twitter, add their screen name and picture to the DB
     if ($introducee1->getTwitterId() != null || $introducee2->getTwitterId() != null) {
         // Which introducees are on Twitter?
         $profilesToRequest = array();
         if ($introducee1->getTwitterId() != null) {
             $profilesToRequest[] = $introducee1->getTwitterId();
         }
         if ($introducee2->getTwitterId() != null) {
             $profilesToRequest[] = $introducee2->getTwitterId();
         }
         // Connect to Twitter API
         $sth = $db->prepare('SELECT id, access_token FROM twitter WHERE person_id = :person_id');
         $sth->execute(array(':person_id' => $userId));
         $userDetails = $sth->fetch(PDO::FETCH_ASSOC);
         if (!empty($userDetails['access_token'])) {
             $twitterAccessToken = unserialize($userDetails['access_token']);
             try {
                 $twitter = new TwitterOAuth(TW_CONSUMER, TW_SECRET, $twitterAccessToken['oauth_token'], $twitterAccessToken['oauth_token_secret']);
                 $twitter->format = 'json';
                 $twitterProfiles = $twitter->get('users/lookup', array('user_id' => implode(',', $profilesToRequest)));
                 foreach ($twitterProfiles as $friend) {
                     $id = (string) $friend->id;
                     $screenName = (string) $friend->screen_name;
                     $pic = (string) $friend->profile_image_url;
                     $protected = (string) $friend->protected;
                     if ($id && ($screenName || $pic || $protected)) {
                         $update = $db->prepare('REPLACE INTO temp_twitter SET twitter_id = :twitter_id, time=NOW(), screen_name = :screen_name, picture_url = :picture_url, protected = :protected');
                         $update->execute(array(':twitter_id' => $id, ':screen_name' => $screenName, ':picture_url' => $pic, ':protected' => $protected));
                     }
                 }
             } catch (ErrorException $e) {
                 // Could not post to Twitter. Bad access token?
                 Debug::l('Error posting to Twitter ' . $e);
             }
         }
     }
     $linkPassword = BaseConvert::generatePassword();
     // Add the introduction to the database
     $insert = $db->prepare('INSERT INTO introduction (introducer_id, introducee1_id, introducee2_id, time, link_password) VALUES (:introducer_id, :introducee1_id, :introducee2_id, NOW(), :link_password)');
     $insert->execute(array(':introducer_id' => $userId, ':introducee1_id' => $introducee1->getId(), ':introducee2_id' => $introducee2->getId(), ':link_password' => $linkPassword));
     $introId = $db->lastInsertId();
     // Add the links for each introducee
     $linkPassword1 = BaseConvert::generatePassword();
     $linkPassword2 = BaseConvert::generatePassword();
     $insert = $db->prepare('INSERT INTO link (introduction_id, person_id, link_password) VALUES (:introduction_id, :person_id, :link_password)');
     $insert->execute(array(':introduction_id' => $introId, ':person_id' => $introducee1->getId(), ':link_password' => $linkPassword1));
     $insert->execute(array(':introduction_id' => $introId, ':person_id' => $introducee2->getId(), ':link_password' => $linkPassword2));
     // If there is a message, add it to the database
     if (!empty($_POST["message"])) {
         $message = htmlentities(trim($_POST['message']), ENT_QUOTES, 'UTF-8');
         if (!empty($message)) {
             $insert = $db->prepare('INSERT INTO message (body, time, introduction_id, writer_id) VALUES (:body, NOW(), :introduction_id, :writer_id)');
             $insert->execute(array(':body' => $message, ':introduction_id' => $introId, ':writer_id' => $userId));
         }
     }
     // Return the success message, which will tell the Javascript to redirect the user to the send-introduction page
     $json['result'] = 'true';
     $json['link'] = APP_URL . '/' . Content::l() . '/send-introduction/';
     $json['time'] = Debug::getInstance()->getTimeElapsed();
     echo json_encode($json);
 }