/* Harbor Hub — SPA frontend. Vanilla JS, hash-routed, talks to the FastAPI API. */
'use strict';

const APP = document.getElementById('app');

/* ── tiny helpers ─────────────────────────────────── */
const esc = (s) => String(s == null ? '' : s).replace(/&/g, '&amp;').replace(/</g, '&lt;').replace(/>/g, '&gt;').replace(/"/g, '&quot;');
const fmtNum = (n) => (n == null || n < 0) ? '—' : n.toLocaleString();
const enc = encodeURIComponent;
const qs = (o) => Object.entries(o).filter(([, v]) => v != null && v !== '').map(([k, v]) => `${k}=${enc(v)}`).join('&');

async function api(path) {
  const r = await fetch(path);
  if (!r.ok) {
    let msg = `${r.status}`;
    try { msg = (await r.json()).detail || msg; } catch {}
    throw new Error(msg);
  }
  return r.json();
}

const ICON = {
  copy: '<svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2"><rect x="9" y="9" width="11" height="11" rx="2"/><path d="M5 15V5a2 2 0 0 1 2-2h10"/></svg>',
  check: '<svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2.5"><path d="M20 6L9 17l-5-5"/></svg>',
  search: '<svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2"><circle cx="11" cy="11" r="7"/><path d="M21 21l-4-4"/></svg>',
  file: '<svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2"><path d="M14 2H6a2 2 0 0 0-2 2v16a2 2 0 0 0 2 2h12a2 2 0 0 0 2-2V8z"/><path d="M14 2v6h6"/></svg>',
  dir: '<svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2"><path d="M3 7a2 2 0 0 1 2-2h4l2 3h8a2 2 0 0 1 2 2v7a2 2 0 0 1-2 2H5a2 2 0 0 1-2-2z"/></svg>',
  info: '<svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2"><circle cx="12" cy="12" r="9"/><path d="M12 16v-4M12 8h.01"/></svg>',
  back: '<svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2"><path d="M15 18l-6-6 6-6"/></svg>',
  next: '<svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2"><path d="M9 18l6-6-6-6"/></svg>',
  term: '<svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2"><path d="M4 17l6-6-6-6M12 19h8"/></svg>',
  panel: '<svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2"><rect x="3" y="4" width="18" height="16" rx="2"/><path d="M9 4v16"/></svg>',
  refresh: '<svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2"><path d="M21 12a9 9 0 1 1-3-6.7L21 8"/><path d="M21 3v5h-5"/></svg>',
};

function copyButton(text, cls = 'copy') {
  const b = document.createElement('button');
  b.className = cls; b.innerHTML = ICON.copy; b.title = 'Copy';
  b.onclick = (e) => {
    e.stopPropagation(); e.preventDefault();
    navigator.clipboard.writeText(text).then(() => {
      b.innerHTML = ICON.check; b.classList.add('copied');
      setTimeout(() => { b.innerHTML = ICON.copy; b.classList.remove('copied'); }, 1100);
    });
  };
  return b;
}

/* ── curated example datasets (shown as bubbles) ──── */
const EXAMPLES = [
  { label: 'Terminal-Bench 2.0', uri: 'harborframework/terminal-bench-2.0' },
  { label: 'Repo2RLEnv · PR diffs', uri: 'AdithyaSK/repo2rlenv-v083-pr_diff' },
  { label: 'TitanBench', uri: 'billshockley/titanbench' },
  { label: 'DABstep · Harbor', uri: 'AdithyaSK/dabstep-harbor' },
  { label: 'Harbor tasks demo', uri: 'gh://adithya-s-k/harbor-tasks-demo' },
];
function srcTag(uri) {
  if (uri.startsWith('gh://') || uri.includes('github.com')) return 'gh';
  if (uri.startsWith('harbor://')) return 'harbor';
  return 'hf';
}
function exampleChips() {
  const wrap = document.createElement('div'); wrap.className = 'chips';
  EXAMPLES.forEach(ex => {
    const tag = srcTag(ex.uri);
    const c = document.createElement('button'); c.className = 'chip'; c.title = ex.uri;
    c.innerHTML = `<span class="src ${tag}">${tag}</span><span>${esc(ex.label)}</span>`;
    c.onclick = () => { location.hash = `dataset?uri=${enc(ex.uri)}`; };
    wrap.appendChild(c);
  });
  return wrap;
}

/* ── theme ────────────────────────────────────────── */
function applyTheme(mode) {
  const sys = window.matchMedia('(prefers-color-scheme: dark)').matches ? 'dark' : 'light';
  document.documentElement.setAttribute('data-theme', mode === 'system' ? sys : mode);
  document.querySelectorAll('#theme-toggle button').forEach(b =>
    b.classList.toggle('active', b.dataset.mode === mode));
}
(function initTheme() {
  let mode = localStorage.getItem('hh-theme') || 'dark';
  applyTheme(mode);
  document.getElementById('theme-toggle').addEventListener('click', (e) => {
    const b = e.target.closest('button'); if (!b) return;
    mode = b.dataset.mode; localStorage.setItem('hh-theme', mode); applyTheme(mode);
  });
  window.matchMedia('(prefers-color-scheme: dark)').addEventListener('change', () => {
    if ((localStorage.getItem('hh-theme') || 'dark') === 'system') applyTheme('system');
  });
})();

/* ── data row with lazy task count ────────────────── */
function datasetRow(id, count) {
  const row = document.createElement('div');
  row.className = 'row';
  row.onclick = () => { location.hash = `dataset?uri=${enc(id)}`; };
  const name = document.createElement('span'); name.className = 'name'; name.textContent = id;
  row.appendChild(name);
  row.appendChild(copyButton(id));
  const t = document.createElement('span'); t.className = 'tasks';
  if (count == null) { t.innerHTML = '<span class="spin">···</span>'; t.dataset.lazy = id; }
  else t.textContent = fmtNum(count);
  row.appendChild(t);
  return row;
}

// Fill in lazy counts for visible rows, throttled.
async function fillCounts(container) {
  const pending = [...container.querySelectorAll('.tasks[data-lazy]')];
  let i = 0;
  const worker = async () => {
    while (i < pending.length) {
      const cell = pending[i++]; const id = cell.dataset.lazy; delete cell.dataset.lazy;
      try { const r = await api(`/api/hub/count?id=${enc(id)}`); cell.textContent = fmtNum(r.tasks); }
      catch { cell.textContent = '—'; }
    }
  };
  await Promise.all([worker(), worker(), worker(), worker()]); // 4 in parallel
}

/* ── routes ───────────────────────────────────────── */
function setActiveNav(name) {
  document.querySelectorAll('.nav .links a').forEach(a => a.classList.toggle('active', a.dataset.nav === name));
}

async function renderHome() {
  setActiveNav('home');
  // Resolve the public base URL: on a HF Space this is the real .hf.space host,
  // so deep-link / badge examples don't show localhost.
  let origin = location.origin;
  try { const cfg = await api('/api/config'); if (cfg.space_host) origin = `https://${cfg.space_host}`; } catch {}
  const badgeUrl = 'https://img.shields.io/badge/%F0%9F%A4%97%20Harbor%20Visualiser-View%20Tasks-ffd21e';
  const deepLink = `${origin}/?dataset=YOUR_DATASET_ID`;
  const badgeMd = `[![Open in Harbor Visualiser](${badgeUrl})](${deepLink})`;
  APP.innerHTML = `
    <div class="hero">
      <div class="mark">🤗</div>
      <h1><span class="hf">Hugging Face</span> Harbor Visualiser</h1>
      <p>Visualise <a href="https://www.harborframework.com" target="_blank" rel="noopener" class="hl">Harbor&nbsp;↗</a> task-spec datasets <strong style="color:var(--text)">straight from the Hugging&nbsp;Face&nbsp;Hub</strong> — metadata, instructions, oracle patches, tests &amp; Dockerfiles. Also works with GitHub repos and local paths. No bulk download, always the latest.</p>
    </div>
    <div class="search" id="load-box">
      ${ICON.search}
      <input id="load-input" placeholder="Load any dataset — owner/name · hf:// · gh://owner/repo · harbor://org/name · /local/path" />
      <span class="kbd">↵</span>
    </div>
    <div style="display:flex;align-items:center;justify-content:space-between;margin:30px 0 14px">
      <h2 style="margin:0">Examples</h2>
      <a class="faint hl" href="#/datasets" style="font-size:13px">Browse all Harbor datasets →</a>
    </div>
    <div id="examples"></div>

    <div class="howto">
      <h2>Link your dataset to the visualiser</h2>
      <div class="steps">
        <div class="step">
          <h3>Deep-link any dataset</h3>
          <p>Append <code>?dataset=&lt;owner&gt;/&lt;name&gt;</code> to open straight into a dataset's tasks — handy from a dataset card or docs.</p>
          <div class="snippet"><code id="snip-link">${esc(origin)}/?dataset=&lt;owner&gt;/&lt;name&gt;</code><span id="copy-link"></span></div>
        </div>
        <div class="step">
          <h3>Add a badge to your dataset card</h3>
          <p>Paste this Markdown into your dataset README so a 🤗 badge always links here:</p>
          <span class="badge-preview"><span class="l">🤗 Harbor Visualiser</span><span class="r">View Tasks</span></span>
          <div class="snippet"><code id="snip-badge">${esc(badgeMd)}</code><span id="copy-badge"></span></div>
        </div>
      </div>
    </div>

    <div class="footer">
      A read-only visualiser for <a href="https://www.harborframework.com" target="_blank" rel="noopener" class="hl">Harbor</a>
      task-spec datasets — the format used by Harbor for agent evaluation &amp; RL environments.
      Runs on Hugging Face Spaces · not affiliated with the Harbor project.
    </div>
  `;
  document.getElementById('copy-link').appendChild(copyButton(`${origin}/?dataset=<owner>/<name>`));
  document.getElementById('copy-badge').appendChild(copyButton(badgeMd));
  document.getElementById('examples').appendChild(exampleChips());
  const input = document.getElementById('load-input');
  input.addEventListener('keydown', (e) => {
    if (e.key === 'Enter' && input.value.trim()) location.hash = `dataset?uri=${enc(input.value.trim())}`;
  });
}

let _hubCache = null;
async function renderDatasets(params) {
  setActiveNav('datasets');
  const sort = params.get('sort') || 'downloads';
  APP.innerHTML = `
    <div class="page">
      <h1>Datasets</h1>
      <p class="muted" style="margin:-8px 0 18px;font-size:13.5px">Search across every <strong style="color:var(--text)">Harbor-tagged dataset on the Hugging&nbsp;Face&nbsp;Hub</strong> — the live <code style="background:var(--panel-2);padding:1px 6px;border-radius:4px">other=harbor</code> filter.</p>
      <div id="ds-examples" style="margin-bottom:20px"></div>
      <div class="search">
        ${ICON.search}
        <input id="ds-search" placeholder="Search Harbor datasets on the Hub…" autofocus />
        <select id="ds-sort">
          <option value="downloads">Most downloads</option>
          <option value="likes">Most likes</option>
          <option value="lastModified">Recently updated</option>
        </select>
        <span class="kbd">⌘K</span>
      </div>
      <div class="card" id="ds-table"><div class="loading"><span class="spinner"></span>loading…</div></div>
      <div class="hint" style="margin-top:18px">
        <span class="ic">${ICON.info}</span>
        <span><strong style="color:var(--text)">Want your dataset to show up here?</strong> Add the <code>harbor</code> tag to your dataset card's metadata (<code>tags: [harbor]</code> in the README front-matter) and it'll appear in this list automatically.</span>
      </div>
    </div>`;
  document.getElementById('ds-examples').appendChild(exampleChips());
  const tbl = document.getElementById('ds-table');
  const search = document.getElementById('ds-search');
  const sortSel = document.getElementById('ds-sort'); sortSel.value = sort;

  async function load() {
    tbl.innerHTML = '<div class="loading"><span class="spinner"></span>loading…</div>';
    try {
      const { datasets } = await api(`/api/hub/datasets?${qs({ sort: sortSel.value, limit: 1000 })}`);
      _hubCache = datasets; draw(datasets);
    } catch (e) { tbl.innerHTML = `<div class="errbox">${esc(e.message)}</div>`; }
  }
  function draw(list) {
    tbl.innerHTML = '<div class="thead"><span>Dataset</span><span class="col-tasks">Tasks</span></div>';
    if (!list.length) { tbl.innerHTML += '<div class="empty">no matching datasets</div>'; return; }
    list.slice(0, 300).forEach(d => tbl.appendChild(datasetRow(d.id, null)));
    if (list.length > 300) tbl.innerHTML += `<div class="empty">showing 300 of ${list.length} — refine your search</div>`;
    fillCounts(tbl);
  }
  let t;
  search.addEventListener('input', () => {
    clearTimeout(t);
    t = setTimeout(() => {
      const q = search.value.trim().toLowerCase();
      draw(q ? _hubCache.filter(d => d.id.toLowerCase().includes(q)) : _hubCache);
    }, 120);
  });
  sortSel.addEventListener('change', load);
  await load();
}

/* ── task viewer (file tree + content) ────────────── */
const LANG = { toml: 'ini', diff: 'diff', patch: 'diff', sh: 'bash', bash: 'bash', py: 'python', json: 'json', yaml: 'yaml', yml: 'yaml', md: 'markdown', js: 'javascript', ts: 'typescript', html: 'xml', css: 'css' };
function langFor(path) {
  if (path.endsWith('Dockerfile')) return 'dockerfile';
  const ext = path.split('.').pop().toLowerCase();
  return LANG[ext] || 'plaintext';
}

function harborCmd(kind, ident, taskId) {
  if (kind === 'gh') return `harbor run --task-git-url https://github.com/${ident}.git -i ${taskId} -a oracle`;
  if (kind === 'local') return `harbor run -p ${ident} -i ${taskId} -a oracle`;
  // hf: pull from the Hub, then run the single task with the oracle agent.
  // Uses the new `hf` CLI (huggingface_hub 1.x; `huggingface-cli` is deprecated).
  const dir = ident.split('/').pop();
  return `hf download ${ident} --repo-type dataset --local-dir ${dir} && harbor run -p ${dir} -i ${taskId} -a oracle`;
}

// Unified dataset+task workspace: tasks side-panel (master) + file tree + content (detail).
// Used by BOTH the `dataset?uri=` route (no task → empty detail) and the
// `task?uri=&task=` route (task preselected). Switching tasks happens in place.
let _taskSiblings = { uri: null, tasks: [], ident: null, kind: null };
async function renderWorkspace(params) {
  setActiveNav('datasets');
  const uri = params.get('uri');
  let task = params.get('task') || null;
  let initialFile = params.get('f');

  APP.innerHTML = `<div class="page"><div class="loading"><span class="spinner"></span>loading…
      <span class="sub">Loading the Harbor spec — a few seconds to a minute for large datasets (the more tasks, the longer the listing).</span>
    </div></div>`;

  // Sibling task list (the panel) + canonical ident/kind (run command).
  // Cached per-uri so flipping between tasks doesn't refetch the list.
  if (_taskSiblings.uri !== uri) {
    try {
      const ds = await api(`/api/dataset?uri=${enc(uri)}`);
      _taskSiblings = { uri, tasks: ds.tasks || [], ident: ds.ident, kind: ds.kind };
    } catch (e) {
      APP.querySelector('.page').innerHTML = `<div class="crumb"><a href="#/datasets">Datasets</a></div><div class="errbox">Failed to load <b>${esc(uri)}</b>: ${esc(e.message)}</div>`;
      return;
    }
  }
  const siblings = _taskSiblings.tasks;
  const ident = _taskSiblings.ident || uri;
  const kind = _taskSiblings.kind || 'hf';

  const page = APP.querySelector('.page');
  // Honour the collapse pref only when a task is open; with no task the panel is the focus.
  const collapsed = task && localStorage.getItem('hh-tasks-collapsed') === '1';
  page.innerHTML = `
    <div class="crumb">
      <button class="nav-btn ghost" id="toggle-tasks" title="Toggle task list">${ICON.panel}</button>
      <a href="#/datasets">Datasets</a><span class="sep">/</span>
      <a href="#dataset?uri=${enc(uri)}" id="crumb-ident">${esc(ident)}</a>
      <span class="pill">${siblings.length} tasks</span>
      <span id="crumb-task-wrap"></span>
      <span class="pos" id="crumb-pos" style="margin-left:auto"></span>
      <button class="nav-btn ghost" id="ws-refresh" title="Refresh dataset">${ICON.refresh}</button>
    </div>
    <div class="runbar" id="runbar" hidden>
      <span class="lbl">${ICON.term}</span>
      <code id="run-cmd"></code>
      <span id="run-copy"></span>
    </div>
    <div class="taskview${collapsed ? ' collapsed' : ''}" id="taskview">
      <div class="tasks-panel" id="tasks-panel">
        <div class="tp-head">Tasks <span class="faint">${siblings.length}</span></div>
        <div class="tp-search">${ICON.search}<input id="tp-search" placeholder="Filter tasks…" autofocus /></div>
        <div class="tp-list" id="tp-list"></div>
      </div>
      <div class="tree" id="tree"></div>
      <div class="content" id="content"></div>
    </div>`;

  const taskview = document.getElementById('taskview');
  const tpList = document.getElementById('tp-list');
  const tree = document.getElementById('tree');
  const content = document.getElementById('content');
  const runbar = document.getElementById('runbar');
  const runCode = document.getElementById('run-cmd');
  const runCopyHolder = document.getElementById('run-copy');

  document.getElementById('toggle-tasks').onclick = () => {
    taskview.classList.toggle('collapsed');
    localStorage.setItem('hh-tasks-collapsed', taskview.classList.contains('collapsed') ? '1' : '0');
  };
  document.getElementById('ws-refresh').onclick = async () => {
    try {
      const ds = await api(`/api/dataset?${qs({ uri, refresh: 1 })}`);
      _taskSiblings = { uri, tasks: ds.tasks || [], ident: ds.ident, kind: ds.kind };
    } catch (e) { alert('refresh failed: ' + e.message); return; }
    renderWorkspace(params);
  };

  // ── tasks side panel ──
  function drawPanel(filter = '') {
    tpList.innerHTML = '';
    const q = filter.trim().toLowerCase();
    const list = q ? siblings.filter(s => s.toLowerCase().includes(q)) : siblings;
    list.slice(0, 1000).forEach(tid => {
      const r = document.createElement('div');
      r.className = 'tp-item' + (tid === task ? ' active' : '');
      r.textContent = tid; r.title = tid; r.dataset.tid = tid;
      r.onclick = () => { if (tid !== task) loadDetail(tid, null); };
      tpList.appendChild(r);
    });
    if (list.length > 1000) {
      const m = document.createElement('div'); m.className = 'empty'; m.textContent = `showing 1000 of ${list.length} — filter to narrow`;
      tpList.appendChild(m);
    }
  }
  drawPanel();
  const tps = document.getElementById('tp-search');
  let ft;
  tps.addEventListener('input', () => { clearTimeout(ft); ft = setTimeout(() => drawPanel(tps.value), 100); });

  function syncPanelActive(tid) {
    tpList.querySelectorAll('.tp-item').forEach(n => n.classList.toggle('active', n.dataset.tid === tid));
    const a = tpList.querySelector('.tp-item.active'); if (a) a.scrollIntoView({ block: 'nearest' });
  }

  // Empty (no task selected) — master-detail "nothing selected" state.
  function showEmpty() {
    task = null;
    runbar.hidden = true;
    syncPanelActive(null);
    document.getElementById('crumb-task-wrap').innerHTML = '';
    document.getElementById('crumb-pos').textContent = '';
    history.replaceState(null, '', '#' + `dataset?${qs({ uri })}`);
    tree.innerHTML = '';
    content.innerHTML = siblings.length
      ? `<div class="emptysel"><div class="ic">${ICON.panel}</div>
         <p>Select a task from the list to view its spec, files & run command.</p></div>`
      : `<div class="emptysel"><div class="ic">${ICON.info}</div>
         <p><strong style="color:var(--text)">No Harbor tasks found in this dataset.</strong><br>
         The visualiser recognises Harbor datasets by either a <code>registry.json</code> at the root, a <code>tasks/</code> folder (nested layout), or top-level dirs containing <code>task.toml</code> (flat layout). This dataset doesn't follow any of those.</p></div>`;
  }

  // ── load one task's detail into the tree + content (no full re-render) ──
  async function loadDetail(tid, wantFile) {
    task = tid;
    syncPanelActive(tid);
    document.getElementById('crumb-task-wrap').innerHTML =
      `<span class="sep">/</span><span id="crumb-task">${esc(tid)}</span><span id="crumb-diff"></span>`;
    const i = siblings.indexOf(tid);
    document.getElementById('crumb-pos').textContent = i >= 0 ? `${i + 1} / ${siblings.length}` : '';
    history.replaceState(null, '', '#' + `task?${qs({ uri, task: tid })}`);

    const cmd = harborCmd(kind, ident, tid);
    runbar.hidden = false;
    runCode.textContent = cmd;
    runCopyHolder.innerHTML = '';
    const rc = copyButton(cmd);
    rc.addEventListener('click', () => { runbar.classList.add('copied'); setTimeout(() => runbar.classList.remove('copied'), 1100); });
    runCopyHolder.appendChild(rc);

    tree.innerHTML = '';
    content.innerHTML = `<div class="loading"><span class="spinner"></span>loading task…</div>`;
    let t;
    try { t = await api(`/api/task?${qs({ uri, task: tid })}`); }
    catch (e) { content.innerHTML = `<div class="errbox">${esc(e.message)}</div>`; return; }
    if (task !== tid) return; // a newer click superseded this fetch

    const diffEl = document.getElementById('crumb-diff');
    if (diffEl) diffEl.innerHTML = t.difficulty ? ` <span class="pill">${esc(t.difficulty)}</span>` : '';
    buildDetail(t, wantFile);
  }

  function buildDetail(t, wantFile) {
    const files = t.files || {};
    const paths = Object.keys(files).sort();
    tree.innerHTML = `<div class="thead2">${esc(t.id)}</div>`;

    function node(label, indent, type, onClick, active) {
      const n = document.createElement('div');
      n.className = 'tnode' + (type === 'dir' ? ' dir' : '') + (active ? ' active' : '');
      n.style.paddingLeft = (14 + indent * 16) + 'px';
      n.innerHTML = (type === 'dir' ? ICON.dir : type === 'info' ? ICON.info : ICON.file) + `<span>${esc(label)}</span>`;
      if (onClick) n.onclick = onClick;
      return n;
    }
    const nodes = {};
    function setHashFile(f) { return `task?${qs({ uri, task: t.id, f })}`; }
    function select(id) {
      Object.values(nodes).forEach(n => n.classList.remove('active'));
      if (nodes[id]) nodes[id].classList.add('active');
      if (id === '__overview__') showOverview(); else showFile(id);
    }
    const ov = node('Overview', 0, 'info', () => { history.replaceState(null, '', '#' + setHashFile('__overview__')); select('__overview__'); });
    nodes['__overview__'] = ov; tree.appendChild(ov);
    const groups = {}; const top = [];
    paths.forEach(p => { if (p.includes('/')) { const f = p.split('/')[0]; (groups[f] = groups[f] || []).push(p); } else top.push(p); });
    top.forEach(p => { const n = node(p, 0, 'file', () => { history.replaceState(null, '', '#' + setHashFile(p)); select(p); }); nodes[p] = n; tree.appendChild(n); });
    Object.keys(groups).sort().forEach(folder => {
      tree.appendChild(node(folder + '/', 0, 'dir'));
      groups[folder].sort().forEach(p => { const n = node(p.split('/').slice(1).join('/'), 1, 'file', () => { history.replaceState(null, '', '#' + setHashFile(p)); select(p); }); nodes[p] = n; tree.appendChild(n); });
    });

    function showOverview() {
      const rows = [];
      const add = (k, v) => { if (v != null && v !== '' && !(Array.isArray(v) && !v.length)) rows.push([k, v]); };
      add('Task id', t.id); add('Name', t.name); add('Org', t.org); add('Version', t.version);
      add('Difficulty', t.difficulty); add('Category', t.category);
      add('Agent timeout', t.agent_timeout_sec != null ? t.agent_timeout_sec + 's' : null);
      add('Verifier timeout', t.verifier_timeout_sec != null ? t.verifier_timeout_sec + 's' : null);
      let html = `<div class="fhead"><span class="path">${ICON.info} Overview</span></div>`;
      if (t.description) html += `<div class="md">${marked.parse(t.description)}</div>`;
      html += '<table class="kv">';
      rows.forEach(([k, v]) => html += `<tr><td>${esc(k)}</td><td>${esc(v)}</td></tr>`);
      if (t.keywords && t.keywords.length) html += `<tr><td>Keywords</td><td>${t.keywords.map(k => `<span class="kw">${esc(k)}</span>`).join('')}</td></tr>`;
      if (t.repo2env) html += `<tr><td>repo2env</td><td><pre style="margin:0;padding:0;background:none">${esc(JSON.stringify(t.repo2env, null, 2))}</pre></td></tr>`;
      html += '</table>';
      const instr = files['instruction.md'] || t.instruction_inline;
      if (instr) html += `<div class="fhead"><span class="path">${ICON.file} instruction.md</span></div><div class="md">${marked.parse(instr)}</div>`;
      content.innerHTML = html;
    }
    function showFile(path) {
      const body = files[path] != null ? files[path] : (path === 'task.toml' ? t.task_toml_raw : '');
      const fhead = document.createElement('div'); fhead.className = 'fhead';
      fhead.innerHTML = `<span class="path">${ICON.file} ${esc(path)}</span>`;
      fhead.appendChild(copyButton(body));
      content.innerHTML = '';
      content.appendChild(fhead);
      if (path.endsWith('.md')) {
        const d = document.createElement('div'); d.className = 'md'; d.innerHTML = marked.parse(body); content.appendChild(d);
      } else {
        const pre = document.createElement('pre'); const code = document.createElement('code');
        code.className = 'language-' + langFor(path); code.textContent = body;
        pre.appendChild(code); content.appendChild(pre);
        try { hljs.highlightElement(code); } catch {}
      }
      content.scrollTop = 0;
    }

    select(wantFile && (nodes[wantFile] || wantFile === '__overview__') ? wantFile : '__overview__');
  }

  if (task) await loadDetail(task, initialFile);
  else showEmpty();
}

/* ── router ───────────────────────────────────────── */
function router() {
  const raw = location.hash.slice(1) || '/';
  const [route, query] = raw.split('?');
  const params = new URLSearchParams(query || '');
  window.scrollTo(0, 0);
  if (route === '/' || route === '' || route === 'home') return renderHome();
  if (route === '/datasets' || route === 'datasets') return renderDatasets(params);
  if (route === 'dataset' || route === 'task') return renderWorkspace(params);
  renderHome();
}

// ⌘K focuses search on datasets page (and jumps there otherwise)
document.addEventListener('keydown', (e) => {
  if ((e.metaKey || e.ctrlKey) && e.key === 'k') {
    e.preventDefault();
    const s = document.getElementById('tp-search') || document.getElementById('ds-search') || document.getElementById('load-input');
    if (s) s.focus(); else location.hash = '/datasets';
  }
});

// ?dataset= / ?d= prefill (legacy Gradio-style deep link) → dataset view
(function prefill() {
  const p = new URLSearchParams(location.search);
  const d = p.get('dataset') || p.get('d');
  if (d && !location.hash) { location.hash = `dataset?uri=${enc(d)}`; }
})();

window.addEventListener('hashchange', router);
router();