// ==UserScript==
// @name         Press Enter / Shift+Enter to navigate episodes
// @description  Press Enter to go to next episode, Shift+Enter to go to previous episode
// @match http://ysjdm6.com/*
// @match http://agedm6.com/*
// @match http://yuejuwu.me/*
// @match http*://agedm1.com/*
// @match http*://agedm2.com/*
// @match http://ysjdm2.com/*
// @match http://acgdmw.com/*
// @match *://www.yhdm03.com/*
// @match *://yhdm007.com/*
// @match *://www.bumimi20.com/*
// @match https://www.olevod.com/*
// @match http://100.65.173.16:5244/*
// @match http://192.168.10.102:5244/*
// @match http://yhdm.in/*
// @match http://www.iyinghua.com/*
// @match https://www.mxdm.xyz/*
// @match https://yhdm.one/*
// @match https://yhdm6.top/*
// @match https://www.868dm.com/*
// @match https://www.agedm.io/*
// @version 1.0.6
// @run-at document-start
// ==/UserScript==

document.addEventListener('keydown', function(event) {
  if (event.key !== 'Enter') return;

  const currentURL = window.location.href;
  const direction = event.shiftKey ? -1 : 1;

  // ---------------------------------------------------------
  // Pattern 1: /001.html
  // e.g. .../005.html → .../006.html
  // ---------------------------------------------------------
  let match = currentURL.match(/\/(\d+)\.(\w+)$/);
  if (match) {
    const num = match[1];
    const ext = match[2];
    const nextNum = String(parseInt(num, 10) + direction).padStart(num.length, "0");

    const nextURL = currentURL.replace(`/${num}.${ext}`, `/${nextNum}.${ext}`);
    window.location.href = nextURL;
    return;
  }

  // ---------------------------------------------------------
  // Pattern 2: /6467-1.html
  // e.g. .../6467-1.html → .../6467-2.html
  // ---------------------------------------------------------
  match = currentURL.match(/\/(\d+)-(\d+)\.(\w+)$/);
  if (match) {
    const id = match[1];
    const num = match[2];
    const ext = match[3];
    const nextNum = String(parseInt(num, 10) + direction).padStart(num.length, "0");

    const nextURL = currentURL.replace(`/${id}-${num}.${ext}`, `/${id}-${nextNum}.${ext}`);
    window.location.href = nextURL;
    return;
  }

  // ---------------------------------------------------------
  // Pattern 3: /9314-2-6.html
  // e.g. .../9314-2-6.html → .../9314-2-7.html
  // ---------------------------------------------------------
  match = currentURL.match(/\/(\d+)-(\d+)-(\d+)\.(\w+)$/);
  if (match) {
    const id1 = match[1];
    const id2 = match[2];
    const num = match[3];
    const ext = match[4];
    const nextNum = String(parseInt(num, 10) + direction).padStart(num.length, "0");

    const currentPart = `/${id1}-${id2}-${num}.${ext}`;
    const nextPart = `/${id1}-${id2}-${nextNum}.${ext}`;

    const nextURL = currentURL.replace(currentPart, nextPart);
    window.location.href = nextURL;
    return;
  }

  // ---------------------------------------------------------
  // Pattern 4: /number or /number/
  // Generic fallback
  // e.g. .../18   → .../19
  //       .../18/ → .../19/
  // ---------------------------------------------------------
  match = currentURL.match(/\/(\d+)(\/?)$/);
  if (match) {
    const num = match[1];
    const trailing = match[2] || "";
    const nextNum = String(parseInt(num, 10) + direction);

    const nextURL = currentURL.replace(`/${num}${trailing}`, `/${nextNum}${trailing}`);
    window.location.href = nextURL;
    return;
  }
});

/*document.addEventListener('keydown', function(event) {
  if (event.key === 'Enter') {
    const currentURL = window.location.href;

    // General pattern: match any URL ending in .html, find last number before .html
    const match = currentURL.match(/(.*?)(\d+)(\.html)$/);
    if (match) {
      const prefix = match[1];       // Everything before the last number
      const numberStr = match[2];    // The number to increment
      const suffix = match[3];       // Usually ".html"

      const nextNumber = String(parseInt(numberStr, 10) + 1).padStart(numberStr.length, '0');
      const nextURL = `${prefix}${nextNumber}${suffix}`;
      window.location.href = nextURL;
    }
  }
});
*/