var CommentsHelper = (function() {
  'use strict';

  /**
    * Initializes the comments
    *
    */
  function initializeComments(){
    var comments;
    if ( $('.step-comment') && $('.step-comment').length > 0 ) {
      comments = $('.step-comment');
    } else if ( $('.result-comment') && $('.result-comment').length > 0 ) {
      comments = $('.result-comment');
    }
    if(!_.isUndefined(comments)) {
      $.each(comments, function(){
        var that = $(this);
        var link = that.attr('data-href');
        $.ajax({ method: 'GET',
                 url: link,
                 beforeSend: animateSpinner(that, true) })
          .done(function(data) {
            that.html(data.html);
            initCommentForm(that);
            initCommentsLink(that);
            scrollBottom(that.find('.content-comments'));
          })
          .always(function() {
            animateSpinner(that, false);
          });
      });
    }
  }

  // scroll to the botttom
  function scrollBottom(id) {
    var list;
    if ( id.hasClass('content-comments') ) {
      list = id;
    } else {
      list = id.find('.content-comments');
    }
    if ( list && list.length > 0) {
      list.scrollTop($(list)[0].scrollHeight);
    }
  }

  // Initialize show more comments link.
  function initCommentsLink($el) {

    $el.find('.btn-more-comments')
    .on('ajax:success', function (e, data) {
      if (data.html) {
        var list = $(this).parents('ul');
        var moreBtn = list.find('.btn-more-comments');
        var listItem = moreBtn.parents('li');
        $(data.html).insertAfter(listItem);
        if (data.results_number < data.per_page) {
          moreBtn.remove();
        } else {
          moreBtn.attr('href', data.more_url);
          moreBtn.trigger('blur');
        }

        // Reposition dropdown comment options
        scrollCommentOptions(listItem
                              .closest('.content-comments')
                              .find('.dropdown-comment'));
      }
    });
  }

  // Initialize comment form.
  function initCommentForm($el) {

    var $form = $el.find('ul form');

    $('.help-block', $form).addClass('hide');

    $form.on('ajax:send', function () {
      $('#comment_message', $form).attr('readonly', true);
    })
    .on('ajax:success', function (e, data) {
      if (data.html) {
        var list = $form.parents('ul');

        // Remove potential 'no comments' element
        list.parent().find('.content-comments')
          .find('li.no-comments').remove();

        list.parent().find('.content-comments')
          .append('<li class="comment">' + data.html + '</li>')
          .scrollTop(0);
        list.parents('ul').find('> li.comment:gt(8)').remove();
        $('#comment_message', $form).val('');
        $('.form-group', $form)
          .removeClass('has-error');
        $('.help-block', $form)
            .html('')
            .addClass('hide');
        scrollBottom($el);
      }
    })
    .on('ajax:error', function (ev, xhr) {
      if (xhr.status === 400) {
        var messageError = xhr.responseJSON.errors.message;

        if (messageError) {
          $('.form-group', $form)
            .addClass('has-error');
          $('.help-block', $form)
              .html(messageError[0])
              .removeClass('hide');
        }
      }
    })
    .on('ajax:complete', function () {
      scrollBottom($('#comment_message', $form));
      $('#comment_message', $form)
        .attr('readonly', false)
        .focus();
    });
  }

  // restore comments after update or when new element is created
  function bindCommentInitializerToNewElement() {
    $(document)
      .ready(function() {
        if( document.getElementById('steps') !== null ) {
          $('#steps')
            .change(function() {
              $('.step-save')
                .on('click', function() {
                  $(document)
                    .on('ajax:success', function(){
                      initializeComments();
                    });
                });
            });
        } else if ( document.getElementById('results') !== null ) {
          $('#results')
            .change(function() {
              $('.save-result')
                .on('click', function() {
                  $(document)
                    .on('ajax:success', function(){
                      initializeComments();
                    });
                });
            });
          }
    });
  }

  // bindCommentInitializerToNewElement();
  // initializeComments();
  return {
    initialize: initializeComments,
    scrollBottom: scrollBottom,
    moreComments: initCommentsLink,
    form: initCommentForm,
    bindNewElement: bindCommentInitializerToNewElement
  };

})();