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// ==UserScript==
// @name        arca.live page mover
// @namespace   Violentmonkey Scripts
// @match       https://arca.live/*
// @grant       none
// @version     1.0.3.7
// @author      7r
// @license     MIT
// @description 2023. 5. 14. 오후 4:58:27
// ==/UserScript==
 
(()=>{
  function getMovedPage(url, direction) {
    if (!url.includes("/write")) {
      url.includes("#") && (url = url.split("#")[0]);
      const [paths, queryString] = url.split('?');
      const path = paths.split("/").filter(part => part && !part.includes(":"));
      const queryParams = queryString ? Object.fromEntries(new URLSearchParams(queryString)) : {};
 
      let openedPosting = path[3] && (path.splice(3, 2), true);
      let numPage = parseInt(queryParams["p"]);
 
      if (((!numPage || numPage === 1) && direction) && !openedPosting) {
        alert("첫페이지 입니다.");
      } else {
        queryParams["p"] = numPage && openedPosting ? numPage : direction ? (numPage - 1 || 1) : (numPage + 1) || (openedPosting || direction ? 1 : 2);
        const updatedQueryString = new URLSearchParams(queryParams).toString();
        location.href = `https://${path.join("/")}?${updatedQueryString}`;
      }
    }
  }
 
  function isInputElement(event) {
    return ['INPUT', 'TEXTAREA'].includes(event.target.nodeName) || event.target.classList.contains('fr-element');
  }
 
  document.addEventListener('keydown', function (event) {
    if (isInputElement(event) || event.altKey || event.ctrlKey || event.shiftKey || [16, 17, 18].includes(event.keyCode)) return;
 
    const isLeftArrow = event.keyCode === 37;
    const isRightArrow = event.keyCode === 39;
 
    if (isLeftArrow || isRightArrow) {
      getMovedPage(document.location.href, isLeftArrow);
      event.preventDefault();
    }
  });
})();