// ==UserScript==
// @name     WykopFilter
// @version  1
// @grant    Melcma
// ==/UserScript==

var bar = document.querySelector('.nav.bspace.rbl-block ul');

var filterButton = document.createElement('BUTTON');
filterButton.innerHTML = 'filtruj';
filterButton.style.marginTop = '6px';
filterButton.addEventListener('click', handleClick);

bar.appendChild(filterButton);

var elements = document.getElementsByClassName('vC');

function handleClick() {
  if (filterButton.classList.contains('active')) {
  	return unfilter();
  }

  return filter();

}

function filter() {
  filterButton.classList.add('active');

	Array.prototype.map.call(elements, (el) => {
  	var span = el.getElementsByTagName('SPAN')[0];
  	if (parseInt(span.innerHTML) < 100) {
    	el.closest('li').style.display = 'none';
  	}
	});

  localStorage.setItem('wykopFilterByPlus', true);
}

function unfilter() {
  filterButton.classList.remove('active');

	Array.prototype.map.call(elements, (el) => {
  	var span = el.getElementsByTagName('SPAN')[0];
  	if (parseInt(span.innerHTML) < 100) {
    	el.closest('li').style.display = 'block';
  	}
	});

  localStorage.removeItem('wykopFilterByPlus', false);
}

if (localStorage.getItem('wykopFilterByPlus')) {
  filter();
}