$(document).ready(function() {

  const MSG = 'Turn off preview and clear the input field to use a different quick reply.';

  let in_preview = false;

  function update_button() {

    const has_text = $("#comment").val() !== "";

    $('.qr-btn').toggleClass('disabled', in_preview || has_text);

    if (in_preview || has_text) {

      $('.qr').attr('data-original-title', MSG);

    } else {

      $('.qr').attr('data-original-title', '');

    }

  }

  $('.qr-reply').on('click', function (e) {

    let tgt = $('#comment');

    if (!tgt.val()) {

      tgt.val($(this).attr('data-qr')).focus();

    }

    $('.qr .dropdown-toggle').dropdown('toggle');

    update_button();

    return false;

  });

  // Disable selecting replies when in preview mode.

  $('#previewinmarkdown').on('click', function () {

    in_preview = !in_preview;

    update_button();

  });

  $('#editinmarkdown').on('click', function () {

    in_preview = !in_preview;

    update_button();

  });

  $('#comment').on('input propertychange', update_button);

  $('[data-toggle="tooltip"]').tooltip();

  update_button();

});