// ==UserScript==
// @name        mail.ru: clean links
// @namespace   lainscripts_mailru_clean_links
// @description Dereferences mail.ru links in emails when clicked. Skips advertisement block displayed when some links are clicked. 
// @author      lainverse
// @license     CC BY-SA
// @version     4.1
// @include     https://e.mail.ru/*
// @grant       none
// @downloadURL none
// ==/UserScript==

var confirmForm = null,
    locate_confirmer = function() {
      confirmForm = document.querySelector('#MailRuConfirm');
      if (!confirmForm) setTimeout(locate_confirmer, 100);
    };
locate_confirmer();

var clb = /^https?:\/\/r\.mail\.ru\/cl[a-z][0-9]+\/(.*)/i,
    cgi = /&(amp;)?url=([^&]*)/i,
    clearLink = function(evt) {
      evt.preventDefault();
      var i = 10, x, confirmer = function() {
        i--;
        if (confirmForm.style.display !== 'none')
          confirmForm.querySelector('.confirm-cancel').click();
        else if (i>0) setTimeout(confirmer, 10);
      };
      for (x in this)
        if (x.indexOf('__originUrl') > -1) {
          var res = null;

          do {
            res = cgi.exec(this[x]);
            if (res) this[x] = decodeURIComponent(res[2]);
            res = clb.exec(this[x]);
            if (res) this[x] = 'http://' + res[1];
          } while (res);

          this.href = this[x];
          console.log("Dereferenced link:", this[x]);
          window.open(this[x], '_blank').focus();

          if (confirmForm) confirmer();
        }
    },
    task = function () {
      var links = document.querySelectorAll('#b-letter A:not(.fixed)');
      if (links.length > 0)
        for (var l = 0; l < links.length; l++) {
          links[l].classList.add("fixed");
          links[l].onclick = clearLink;
        }
    };

function link_monitor() { task(); setTimeout(link_monitor, 100); }
setTimeout(link_monitor, 0);