// ==UserScript==
// @name         RIN Mobile Thread
// @description  Mobile Beitragsansicht fuer cs.rin.ru
// @version      2.3
// @match        *://cs.rin.ru/forum/viewtopic.php*
// @run-at       document-start
// ==/UserScript==

(function () {
  'use strict';

  var DEBUG = true;
  var log = [];

  function h() { return document.head || document.documentElement; }

  if (!document.querySelector('meta[name="viewport"][data-rm]')) {
    var m = document.createElement('meta');
    m.name = 'viewport';
    m.content = 'width=device-width, initial-scale=1, viewport-fit=cover';
    m.setAttribute('data-rm', '1');
    h().appendChild(m);
  }

  var st = document.createElement('style');
  st.textContent = `
    html, body { max-width:100% !important; overflow-x:hidden !important;
                 margin:0 !important; padding:0 !important; }
    body { font-size:16px !important;
           -webkit-text-size-adjust:100% !important; }

    .rm-dbg { background:#222; color:#0f0; font:12px/1.45 monospace;
              padding:8px 10px; white-space:pre-wrap; }
    .rm-hidden { display:none !important; }

    .rm-root { box-sizing:border-box !important; display:block !important;
               width:100vw !important; max-width:100vw !important;
               margin:0 !important; padding:0 0 64px 0 !important;
               overflow:hidden !important; }

    .rm-topic { box-sizing:border-box; padding:16px 14px 12px;
                font-size:21px; font-weight:650; line-height:1.3;
                overflow-wrap:break-word; }

    .rm-post { box-sizing:border-box !important;
               width:100% !important; max-width:100% !important;
               padding:14px !important;
               border-top:1px solid rgba(128,128,128,.25) !important; }

    .rm-head { display:flex; align-items:center; gap:9px;
               margin-bottom:10px; min-width:0; }
    .rm-av { flex:none; width:28px; height:28px; border-radius:50%;
             object-fit:cover; background:rgba(128,128,128,.25); }
    .rm-who { min-width:0; flex:1; }
    .rm-user { font-size:14px; font-weight:650; line-height:1.2;
               overflow:hidden; text-overflow:ellipsis; white-space:nowrap; }
    .rm-sub { font-size:11px; opacity:.55; line-height:1.3;
              overflow:hidden; text-overflow:ellipsis; white-space:nowrap; }

    .rm-body { font-size:17px !important; line-height:1.55 !important;
               overflow-wrap:break-word !important;
               word-break:normal !important; }
    .rm-body * { max-width:100% !important; }
    .rm-body img { height:auto !important; border-radius:6px; }
    .rm-body a { overflow-wrap:anywhere !important; }
    .rm-body table { display:block !important; overflow-x:auto !important;
                     width:auto !important; }
    .rm-body pre, .rm-body code {
      display:block; overflow-x:auto; white-space:pre;
      font-size:13px; padding:10px; border-radius:8px;
      background:rgba(128,128,128,.14); }
    .rm-body blockquote, .rm-body .quote, .rm-body table.quote {
      display:block !important; margin:12px 0 !important;
      padding:8px 0 8px 12px !important;
      border-left:3px solid rgba(140,140,255,.5) !important;
      font-size:15px !important; opacity:.8 !important;
      background:none !important; }
    .rm-body ul, .rm-body ol { padding-left:22px !important; }
    .rm-body hr { border:0; border-top:1px solid rgba(128,128,128,.3); }

    .rm-sig { margin-top:12px; font-size:13px; opacity:.5; }
    .rm-sig summary { cursor:pointer; opacity:.8; }

    .rm-nav { position:fixed; left:0; right:0; bottom:0; z-index:9999;
              display:flex; align-items:center; justify-content:space-between;
              gap:8px; padding:10px 12px calc(10px + env(safe-area-inset-bottom));
              background:rgba(28,28,30,.94);
              -webkit-backdrop-filter:blur(12px);
              backdrop-filter:blur(12px);
              border-top:1px solid rgba(128,128,128,.3); }
    .rm-nav a, .rm-nav span { font-size:14px; color:#eee !important;
                              text-decoration:none !important;
                              white-space:nowrap; }
    .rm-nav a { padding:7px 13px; border-radius:99px;
                border:1px solid rgba(160,160,160,.45); }
    .rm-nav .rm-step { min-width:22px; text-align:center;
                       font-size:17px; line-height:1; padding:9px 12px; }
    .rm-nav .rm-pos { opacity:.6; font-size:13px; }
    .rm-nav .rm-pos-btn { opacity:1; padding:7px 12px; border-radius:99px;
                          border:1px solid rgba(160,160,160,.45);
                          cursor:pointer; }
    .rm-nav .rm-off { opacity:.28; border-color:rgba(160,160,160,.2); }

    .rm-sheet-bg { position:fixed; top:0; left:0; right:0; bottom:0;
                   z-index:10000; background:rgba(0,0,0,.5);
                   opacity:0; pointer-events:none; transition:opacity .18s; }
    .rm-sheet-bg.rm-open { opacity:1; pointer-events:auto; }

    .rm-sheet { box-sizing:border-box;
                position:fixed; left:0; right:0; bottom:0; z-index:10001;
                display:flex; flex-direction:column; max-height:72vh;
                padding:8px 12px calc(12px + env(safe-area-inset-bottom));
                color:#eee; background:rgba(28,28,30,.98);
                -webkit-backdrop-filter:blur(14px);
                backdrop-filter:blur(14px);
                border-top:1px solid rgba(128,128,128,.3);
                border-radius:14px 14px 0 0;
                transform:translateY(102%);
                transition:transform .22s ease; }
    .rm-sheet.rm-open { transform:translateY(0); }
    .rm-grip { flex:none; width:36px; height:4px; margin:2px auto 12px;
               border-radius:2px; background:rgba(200,200,200,.35); }
    .rm-goto { flex:none; display:flex; gap:8px; margin-bottom:12px; }
    /* 16px verhindert, dass iOS beim Fokussieren in das Feld hineinzoomt. */
    .rm-goto input { flex:1; min-width:0; box-sizing:border-box;
                     font-size:16px; padding:9px 12px; border-radius:10px;
                     color:#eee; background:rgba(120,120,120,.18);
                     border:1px solid rgba(160,160,160,.35); }
    .rm-goto button { flex:none; font-size:14px; padding:9px 18px;
                      border-radius:10px; color:#eee;
                      background:rgba(120,120,120,.18);
                      border:1px solid rgba(160,160,160,.45); }
    .rm-grid { flex:1; min-height:0; overflow-y:auto;
               -webkit-overflow-scrolling:touch;
               display:grid; gap:8px; padding-bottom:4px;
               grid-template-columns:repeat(auto-fill, minmax(56px, 1fr)); }
    .rm-grid a { display:flex; align-items:center; justify-content:center;
                 min-height:42px; font-size:14px; border-radius:10px;
                 color:#eee !important; text-decoration:none !important;
                 background:rgba(120,120,120,.12);
                 border:1px solid rgba(160,160,160,.3); }
    .rm-grid a.rm-cur { font-weight:700;
                        background:rgba(120,170,255,.22);
                        border-color:rgba(120,170,255,.9); }
  `;
  h().appendChild(st);

  function txt(el) { return (el ? el.textContent || '' : '')
                       .replace(/\s+/g, ' ').trim(); }

  // Der Beitragstext liegt in einer verschachtelten Tabelle. closest('tr')
  // trifft deshalb die innere Zeile, der Autor- und Profilspalte fehlen.
  // Aufsteigen, bis die Zeile eine Profil- oder Autorenspalte enthaelt.
  function postRow(pb) {
    var tr = pb.closest('tr');
    while (tr) {
      if (tr.querySelector(':scope > td.profile') ||
          tr.querySelector(':scope > td .postauthor')) return tr;
      var up = tr.parentElement ? tr.parentElement.closest('tr') : null;
      if (!up) return tr;
      tr = up;
    }
    return null;
  }

  // --- Seitenzustand ---
  // Der Block wird aus dem Original-DOM gelesen, bevor es ausgeblendet wird.
  // phpBB zeigt nie alle Seitenzahlen an, deshalb wird nicht auf gerenderte
  // Links gesetzt, sondern jede Ziel-URL aus start = (Seite - 1) * per_page
  // selbst gebaut.
  function pageState() {
    var s = { cur: 1, total: 1, per: 0, prev: null, next: null };

    // Der Paginierungsblock ist der einzige Ort, an dem Ziffern-Links
    // Seitenzahlen bedeuten. Beitragstexte enthalten ebenfalls Links mit
    // start=, die hier nicht mitgezaehlt werden duerfen.
    var box = null;
    var jumpA = document.querySelector('a[onclick*="jumpto"]');
    if (jumpA) box = jumpA.parentElement;
    if (!box) {
      document.querySelectorAll('a[href*="start="]').forEach(function (a) {
        if (!box && /^(Next|Weiter|Nächste)$/i.test(txt(a)))
          box = a.parentElement;
      });
    }

    // per_page steht als Literal in der jumpto()-Funktion der Seite.
    document.querySelectorAll('script').forEach(function (el) {
      if (s.per) return;
      var m = (el.textContent || '').match(/per_page\s*=\s*'?(\d+)/);
      if (m) s.per = parseInt(m[1], 10);
    });

    if (box) {
      box.querySelectorAll('a[href*="start="]').forEach(function (a) {
        var t = txt(a);
        if (!/^\d+$/.test(t)) return;
        var n = parseInt(t, 10);
        if (n > s.total) s.total = n;
        var ms = a.href.match(/[?&]start=(\d+)/);
        if (!s.per && ms && n > 1) {
          var per = parseInt(ms[1], 10) / (n - 1);
          if (per > 0 && per === Math.floor(per)) s.per = per;
        }
      });
    }

    var cs = location.search.match(/[?&]start=(\d+)/);
    if (s.per) s.cur = Math.floor((cs ? parseInt(cs[1], 10) : 0) / s.per) + 1;
    else if (box) {
      var strong = box.querySelector('strong, b > strong');
      if (strong && /^\d+$/.test(txt(strong))) s.cur = parseInt(txt(strong), 10);
    }

    // Aeltere Themes geben stattdessen "Page X of Y" aus.
    var pos = txt(document.body).match(/Page\s+(\d+)\s+of\s+(\d+)/i);
    if (pos) {
      if (!s.per) s.cur = parseInt(pos[1], 10);
      s.total = Math.max(s.total, parseInt(pos[2], 10));
    }
    if (s.cur > s.total) s.total = s.cur;

    s.url = function (n) {
      if (n === s.cur || n < 1 || n > s.total) return null;
      if (n !== 1 && !s.per) return null;
      var u = location.href.split('#')[0];
      var start = (n - 1) * s.per;
      if (/[?&]start=\d+/.test(u))
        return u.replace(/([?&]start=)\d+/, '$1' + start);
      return u + (u.indexOf('?') === -1 ? '?' : '&') + 'start=' + start;
    };

    s.prev = s.url(s.cur - 1);
    s.next = s.url(s.cur + 1);
    // Ohne bekanntes per_page bleibt nur, die Original-Links zu uebernehmen.
    if (!s.per) {
      document.querySelectorAll('a').forEach(function (a) {
        var t = txt(a);
        if (!s.prev && /^(Previous|Vorherige)$/i.test(t)) s.prev = a.href;
        if (!s.next && /^(Next|Weiter|Nächste)$/i.test(t)) s.next = a.href;
      });
    }

    log.push('page=' + s.cur + '/' + s.total + ' per=' + s.per);
    return s;
  }

  // Seitenwahl als Sheet ueber der Leiste. Wird erst beim ersten Antippen
  // gebaut: bei 1000+ Seiten waere das Raster sonst umsonst im DOM.
  function pageSheet(s) {
    var bg = null, sheet = null;

    function go(n) {
      n = Math.min(Math.max(n, 1), s.total);
      var u = s.url(n);
      if (u) location.href = u;
      else close();
    }

    function close() {
      if (!bg) return;
      bg.classList.remove('rm-open');
      sheet.classList.remove('rm-open');
      document.body.style.overflow = '';
    }

    function make() {
      bg = document.createElement('div');
      bg.className = 'rm-sheet-bg';
      bg.addEventListener('click', close);

      sheet = document.createElement('div');
      sheet.className = 'rm-sheet';

      var grip = document.createElement('div');
      grip.className = 'rm-grip';
      sheet.appendChild(grip);

      var row = document.createElement('div');
      row.className = 'rm-goto';
      var inp = document.createElement('input');
      inp.type = 'text';
      inp.inputMode = 'numeric';
      inp.pattern = '[0-9]*';
      inp.placeholder = 'Seite 1 – ' + s.total;
      inp.setAttribute('aria-label', 'Seitenzahl');
      var btn = document.createElement('button');
      btn.type = 'button';
      btn.textContent = 'Los';
      function submit() {
        var n = parseInt(inp.value, 10);
        if (n > 0) go(n);
      }
      btn.addEventListener('click', submit);
      inp.addEventListener('keydown', function (e) {
        if (e.key === 'Enter') { e.preventDefault(); submit(); }
      });
      row.appendChild(inp);
      row.appendChild(btn);
      sheet.appendChild(row);

      var grid = document.createElement('div');
      grid.className = 'rm-grid';
      var curEl = null;
      for (var i = 1; i <= s.total; i++) {
        var a = document.createElement('a');
        a.textContent = i;
        if (i === s.cur) { a.className = 'rm-cur'; curEl = a; }
        else {
          var u = s.url(i);
          if (u) a.href = u;
        }
        grid.appendChild(a);
      }
      sheet.appendChild(grid);

      document.body.appendChild(bg);
      document.body.appendChild(sheet);
      return curEl;
    }

    return function open() {
      var curEl = bg ? null : make();
      document.body.style.overflow = 'hidden';
      // Ein Frame Abstand, sonst faellt der Uebergang beim ersten Oeffnen aus.
      requestAnimationFrame(function () {
        bg.classList.add('rm-open');
        sheet.classList.add('rm-open');
        if (curEl) curEl.scrollIntoView({ block: 'center' });
      });
    };
  }

  function build() {
    var bodies = document.querySelectorAll('span.postbody, .postbody');
    log.push('postbodies=' + bodies.length);
    if (!bodies.length) return;

    var root = document.createElement('div');
    root.className = 'rm-root';

    var tt = document.querySelector('a.maintitle, h1, .maintitle');
    if (tt) {
      var th = document.createElement('div');
      th.className = 'rm-topic';
      th.textContent = txt(tt);
      root.appendChild(th);
    }

    var built = 0, seen = new Set();

    bodies.forEach(function (pb) {
      var row = postRow(pb);
      if (!row || seen.has(row)) return;
      seen.add(row);

      var card = document.createElement('div');
      card.className = 'rm-post';

      // --- Zellen dieser Zeile + der Kopfzeilen darueber ---
      var cells = [];
      Array.prototype.forEach.call(row.children, function (td) {
        if (!td.contains(pb)) cells.push(td);
      });
      var pr = row.previousElementSibling, g = 0;
      while (pr && g++ < 3) {
        Array.prototype.forEach.call(pr.children, function (td) {
          cells.push(td);
        });
        if (pr.querySelector('.postauthor, a[href*="profile.php"]')) break;
        pr = pr.previousElementSibling;
      }

      // --- Username ---
      var user = '';
      for (var i = 0; i < cells.length && !user; i++) {
        var ua = cells[i].querySelector(
          '.postauthor, .username-coloured, a[href*="profile.php"]');
        if (ua) user = txt(ua);
      }
      if (!user) {
        for (var i2 = 0; i2 < cells.length && !user; i2++) {
          var nm = cells[i2].querySelector('span.name b, span.name, b.name');
          if (nm) user = txt(nm);
        }
      }
      user = user.replace(/^Post subject:.*/i, '').trim();

      // --- Avatar ---
      var avImg = null, bestArea = 0;
      cells.forEach(function (td) {
        td.querySelectorAll('img').forEach(function (im) {
          var s = im.getAttribute('src') || '';
          if (/spacer|blank|icon|rank|star|folder|button|pm|email|quote|edit|report|www|msn|aim|yim|icq|topic/i.test(s))
            return;
          if (/avatar/i.test(s)) { avImg = im; bestArea = 1e9; return; }
          var w = parseInt(im.getAttribute('width'), 10) || im.naturalWidth || 0;
          var hh = parseInt(im.getAttribute('height'), 10) || im.naturalHeight || 0;
          var a = w * hh;
          if (w >= 40 && a > bestArea) { avImg = im; bestArea = a; }
        });
      });

      // --- Rang, Postzahl, Zeitstempel ---
      var allTxt = cells.map(txt).join(' ');
      var rank = '';
      var rr = allTxt.match(/\b(Administrator|Site Admin|Global Moderator|Moderator|VIP|Uploader|Supporter|Member|Newbie|Guest)\b/i);
      if (rr) rank = rr[1];
      var pc = allTxt.match(/Posts:\s*([\d.,]+)/i);
      if (pc) rank = (rank ? rank + ' · ' : '') + pc[1] + ' Posts';

      var when = '';
      var wm = allTxt.match(/Posted:\s*([^|]+?)(?:\s{2,}|Post subject|$)/i);
      if (wm) when = wm[1].trim();

      // --- Kopfzeile ---
      var head = document.createElement('div');
      head.className = 'rm-head';

      var av;
      if (avImg) {
        av = document.createElement('img');
        av.src = avImg.src;
      } else {
        av = document.createElement('div');
        av.textContent = (user || '?').charAt(0).toUpperCase();
        av.style.cssText = 'display:flex;align-items:center;' +
          'justify-content:center;font-size:13px;font-weight:700;' +
          'color:rgba(255,255,255,.75);';
      }
      av.className = 'rm-av';
      head.appendChild(av);

      var who = document.createElement('div');
      who.className = 'rm-who';
      var un = document.createElement('div');
      un.className = 'rm-user';
      un.textContent = user || 'Gast';
      who.appendChild(un);
      var sub = document.createElement('div');
      sub.className = 'rm-sub';
      sub.textContent = [rank, when].filter(Boolean).join(' · ');
      who.appendChild(sub);
      head.appendChild(who);
      card.appendChild(head);

      // --- Signatur abtrennen ---
      var sig = null, hr = pb.querySelector('hr');
      if (hr) {
        sig = document.createElement('details');
        sig.className = 'rm-sig';
        var sm = document.createElement('summary');
        sm.textContent = 'Signatur';
        sig.appendChild(sm);
        var n = hr.nextSibling;
        while (n) { var nx = n.nextSibling; sig.appendChild(n); n = nx; }
        hr.remove();
      }

      var bodyWrap = document.createElement('div');
      bodyWrap.className = 'rm-body';
      bodyWrap.appendChild(pb);
      card.appendChild(bodyWrap);
      if (sig && sig.childNodes.length > 1) card.appendChild(sig);

      root.appendChild(card);
      built++;
    });

    log.push('posts=' + built);
    if (!built) return;

    // --- Navigationsleiste ---
    var pg = pageState();
    var nav = document.createElement('div');
    nav.className = 'rm-nav';

    function navBtn(href, label, aria) {
      var e = document.createElement('a');
      e.className = 'rm-step' + (href ? '' : ' rm-off');
      e.textContent = label;
      e.setAttribute('aria-label', aria);
      if (href) e.href = href;
      return e;
    }
    nav.appendChild(navBtn(pg.url(1), '«', 'Erste Seite'));
    nav.appendChild(navBtn(pg.prev, '‹', 'Vorherige Seite'));

    var pos = document.createElement('span');
    pos.className = 'rm-pos';
    pos.textContent = pg.cur + ' / ' + pg.total;
    // Ohne bekanntes per_page laesst sich kein Sprungziel bauen, dann bleibt
    // die Anzeige reine Beschriftung.
    if (pg.total > 1 && pg.per) {
      pos.className += ' rm-pos-btn';
      pos.textContent += ' ▾';
      pos.setAttribute('role', 'button');
      pos.setAttribute('aria-label', 'Seite wählen');
      pos.addEventListener('click', pageSheet(pg));
    }
    nav.appendChild(pos);

    nav.appendChild(navBtn(pg.next, '›', 'Nächste Seite'));
    nav.appendChild(navBtn(pg.url(pg.total), '»', 'Letzte Seite'));
    root.appendChild(nav);

    Array.prototype.forEach.call(document.body.children, function (el) {
      if (el !== root) el.classList.add('rm-hidden');
    });
    document.body.appendChild(root);
  }

  function run() {
    try { build(); } catch (e) { log.push('build: ' + e.message); }
    if (DEBUG) {
      var d = document.createElement('div');
      d.className = 'rm-dbg';
      d.textContent = 'RIN Thread v2.3\n' + log.join('\n');
      document.body.insertBefore(d, document.body.firstChild);
    }
  }

  if (document.readyState === 'loading')
    document.addEventListener('DOMContentLoaded', run);
  else run();
})();