// ==UserScript==
// @name         Aliexpress Url Cleaner
// @version      0.1
// @description  Removes unnecessary parameters to Aliexpress urls
// @match        *://*.aliexpress.com/*
// @require      https://code.jquery.com/jquery-3.1.1.slim.min.js
// @require      https://cdnjs.cloudflare.com/ajax/libs/babel-polyfill/6.20.0/polyfill.min.js
// @namespace    https://greasyfork.org/users/168
// @grant        none
// @downloadURL none
// ==/UserScript==
/* global jQuery */


let reg = /(\/\/(?:\w+\.)*aliexpress\.com\/store\/product\/[^\/]+\/\d+_\d+\.html)(\?[^#\r\n]+)?(#.+)?/;

function toCanonical(original) {
    let match = original.match(reg);
    if (match && match[1]) {
        return match[1] + (match[3] || '');
    }
    return null;
}

(new Promise(jQuery)).then(() => {
    let canonical = toCanonical(window.location.href) || toCanonical(jQuery('link[rel=canonical]').attr('href') + window.location.hash);
    if (canonical) {
        window.history.replaceState({}, '', canonical);
    }
    jQuery('a').each((i, e) => {
        var canonical = toCanonical(e.href);
        if (canonical) {
            e.href = canonical;
        }
    });
});