/**
 * The heartbeat object.
 */
Drupal.heartbeat = Drupal.heartbeat || {};

Drupal.heartbeat.moreLink = null;

/**
 * wait().
 *   Function that shows throbber while waiting a response.
 */
Drupal.heartbeat.wait = function(element, parentSelector) {

  // We wait for a server response and show a throbber 
  // by adding the class heartbeat-messages-waiting.
  Drupal.heartbeat.moreLink = $(element).parents(parentSelector);
  // Disable double-clicking.
  if (Drupal.heartbeat.moreLink.is('.heartbeat-messages-waiting')) {      
    return false;
  }
  Drupal.heartbeat.moreLink.addClass('heartbeat-messages-waiting');
  
}

/**
 * doneWaiting().
 *   Function that is triggered if waiting period is over, to start
 *   normal behavior again.
 */
Drupal.heartbeat.doneWaiting = function() {
  Drupal.heartbeat.moreLink.removeClass('heartbeat-messages-waiting');
}

/**
 * getOlderMessages().
 *   Fetch older messages with ajax.
 */
Drupal.heartbeat.getOlderMessages = function(element, page, account) {
  Drupal.heartbeat.wait(element, '.heartbeat-more-messages-wrapper');
  var post = {
    block: page ? 0 : 1,
    ajax: 1
  };

  if (account != undefined && account != -1) {
    post.account = account;
  }
  
  $.event.trigger('heartbeatBeforeOlderMessages', [post]); 
  $.post(element.href, post, Drupal.heartbeat.appendMessages);
}

/**
 * pollMessages().
 *   Function that checks and fetches newer messages to the
 *   current stream.
 */
Drupal.heartbeat.pollMessages = function(stream) {

  var stream_selector = '#heartbeat-stream-' + stream;
  
  if ($(stream_selector).length > 0) {
    var href = Drupal.settings.heartbeat_poll_url;
    var uaids = new Array();
    var beats = $(stream_selector + ' .beat-item');
    var firstUaid = 0;
    
    if (beats.length > 0) {    
      firstUaid = $(beats.get(0)).attr('id').replace("beat-item-", "");
      
      beats.each(function(i) {  
        var uaid = parseInt($(this).attr('id').replace("beat-item-", ""));
        uaids.push(uaid);
      });
    }
    
    var post = {
      latestUaid: firstUaid,
      language: Drupal.settings.heartbeat_language, 
      stream: stream, 
      uaids: uaids.join(',')
    };
    $.event.trigger('heartbeatBeforePoll', [post]); 
    if (firstUaid) {
      $.post(href, post, Drupal.heartbeat.prependMessages);
    }
  }
}

/**
 * appendMessages().
 *   Function that appends older messages to the stream.
 */
Drupal.heartbeat.appendMessages = function(data) {
  
  var result = Drupal.parseJson(data);
  
  var wrapper = Drupal.heartbeat.moreLink.parents('.heartbeat-messages-wrapper');
  Drupal.heartbeat.moreLink.remove();
  var data = $(result['data']);
  wrapper.append(data);
  Drupal.heartbeat.doneWaiting();
    
  // Reattach behaviors for new added html
  Drupal.attachBehaviors(data);
  
}

/**
 * prependMessages().
 *   Append messages to the front of the stream. This done for newer 
 *   messages, often with the auto poller.
 */
Drupal.heartbeat.prependMessages = function(data) {

  var result = Drupal.parseJson(data);
  var stream_selector = '#heartbeat-stream-' + result['stream'];

  // Update the times in the stream
  if (result['time_updates'] != undefined) {
    var time_updates = result['time_updates'];
    for (uaid in time_updates) {
      $(stream_selector + ' #beat-item-' + uaid).find('.heartbeat_times').html(time_updates[uaid]);
    }
  }

  // Append the messages
  if (result['data'] != '') {
    var data = $(result['data']);
    $(stream_selector + ' .heartbeat-messages-wrapper').prepend(data);
    // Reattach behaviors for new added html
    Drupal.attachBehaviors(data);
  }
}

/**
 * splitGroupedMessage().
 * 
 * Splits a grouped message into separate ones.
 * 
 * @param Integer uaid
 *   The user activity Id for the grouped message.
 * @param Array uaids
 *   The standalone user activity Ids involved in the grouped message.
 */
Drupal.heartbeat.splitGroupedMessage = function(uaid, uaids) {
  if (uaids == null) {
    $("#beat-item-" + uaid).show('slow');
    $("#beat-item-" + uaid + "-ungrouped").hide('slow');  
  }
  else {
    $("#beat-item-" + uaid).hide('slow');
    $("#beat-item-" + uaid + "-ungrouped").show('slow'); 
  }
}

/**
 * Document onReady().
 */
$(document).ready(function() {
  var span = 0;
  if (Drupal.settings.heartbeatPollNewerMessages != undefined) {
    for (n in Drupal.settings.heartbeatPollNewerMessages) {
      if (parseInt(Drupal.settings.heartbeatPollNewerMessages[n]) > 0) {
        var interval = (Drupal.settings.heartbeatPollNewerMessages[n] * 1000) + span;
        var poll = setInterval('Drupal.heartbeat.pollMessages("' + n + '")', interval);
        span += 100;
      }
    }  
  }
});