asupersync 0.3.1

Spec-first, cancel-correct, capability-secure async runtime for Rust.
Documentation 
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Asupersync Debug Dashboard</title>
<style>
  * { margin: 0; padding: 0; box-sizing: border-box; }
  body { font-family: monospace; background: #1a1a2e; color: #e0e0e0; padding: 16px; }
  h1 { color: #0ff; margin-bottom: 8px; }
  .meta { color: #888; font-size: 12px; margin-bottom: 16px; }
  .toolbar { margin-bottom: 12px; display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }
  .toolbar input[type="text"] { background: #16213e; border: 1px solid #0f3460; color: #e0e0e0; padding: 4px 8px;
    border-radius: 3px; font-family: monospace; font-size: 13px; width: 200px; }
  .toolbar label { font-size: 12px; color: #888; cursor: pointer; }
  .toolbar label input { margin-right: 4px; }
  .section { background: #16213e; border: 1px solid #0f3460; border-radius: 4px; padding: 12px; margin-bottom: 12px; }
  .section h2 { color: #e94560; font-size: 14px; margin-bottom: 8px; }
  #error { color: #e94560; display: none; margin-bottom: 8px; }
  .counter { display: inline-block; background: #0f3460; border-radius: 3px; padding: 2px 8px; margin: 2px; }
  /* Tree view */
  .tree { font-size: 13px; line-height: 1.6; }
  .tree-node { position: relative; }
  .tree-row { display: flex; align-items: center; gap: 4px; padding: 1px 4px; border-radius: 3px; cursor: pointer; }
  .tree-row:hover { background: rgba(15,52,96,0.6); }
  .tree-row.selected { background: #0f3460; }
  .tree-children { padding-left: 20px; border-left: 1px solid #0f3460; margin-left: 8px; }
  .tree-children.collapsed { display: none; }
  .toggle { display: inline-block; width: 16px; text-align: center; color: #888; font-size: 11px;
    user-select: none; cursor: pointer; }
  .toggle:hover { color: #0ff; }
  .icon { font-size: 12px; }
  .node-label { color: #e0e0e0; }
  .node-id { color: #0ff; }
  .node-name { color: #aaa; font-style: italic; }
  .node-state { font-weight: bold; }
  .node-extra { color: #666; font-size: 11px; }
  /* State colors */
  .st-open, .st-running, .st-created { color: #4caf50; }
  .st-closing, .st-cancelling, .st-cancelrequested { color: #ff9800; }
  .st-draining { color: #ff5722; }
  .st-finalizing { color: #ce93d8; }
  .st-closed, .st-completed { color: #666; }
  .st-error, .st-panicked { color: #e94560; }
  /* Detail panel */
  #detail { display: none; }
  #detail.visible { display: block; }
  #detail pre { background: #0d1b30; padding: 8px; border-radius: 3px; font-size: 12px;
    overflow-x: auto; max-height: 300px; overflow-y: auto; }
  /* Events table */
  table { width: 100%; border-collapse: collapse; font-size: 13px; }
  th { text-align: left; color: #0ff; padding: 4px 8px; border-bottom: 1px solid #0f3460; }
  td { padding: 4px 8px; border-bottom: 1px solid #0f3460; }
  /* Animation */
  .tree-node.changed { animation: flash 0.6s ease; }
  @keyframes flash { 0%,100% { background: transparent; } 50% { background: rgba(0,255,255,0.1); } }
  .tree-node.new { animation: fadeIn 0.3s ease; }
  @keyframes fadeIn { from { opacity: 0; transform: translateX(-8px); } to { opacity: 1; } }
  .tree-node.removing { animation: fadeOut 0.3s ease forwards; }
  @keyframes fadeOut { to { opacity: 0; height: 0; overflow: hidden; } }
  .empty { color: #666; font-style: italic; }
  /* Timeline */
  .timeline-bar { position: relative; height: 28px; background: #0d1b30; border-radius: 3px;
    margin-bottom: 8px; cursor: pointer; overflow: hidden; }
  .timeline-fill { position: absolute; top: 0; left: 0; height: 100%; background: #0f3460; }
  .timeline-cursor { position: absolute; top: 0; width: 2px; height: 100%; background: #0ff;
    pointer-events: none; }
  .timeline-marker { position: absolute; top: 4px; width: 6px; height: 6px; border-radius: 50%;
    transform: translateX(-3px); }
  .timeline-marker.task { background: #4caf50; }
  .timeline-marker.region { background: #2196f3; }
  .timeline-marker.obligation { background: #ff9800; }
  .timeline-marker.cancel { background: #e94560; }
  .timeline-marker.io { background: #ce93d8; }
  .timeline-labels { display: flex; justify-content: space-between; font-size: 11px; color: #666;
    margin-bottom: 8px; }
  .timeline-controls { display: flex; gap: 8px; align-items: center; margin-bottom: 8px; }
  .timeline-controls button { background: #0f3460; border: 1px solid #0f3460; color: #e0e0e0;
    padding: 2px 10px; border-radius: 3px; cursor: pointer; font-family: monospace; font-size: 12px; }
  .timeline-controls button:hover { background: #1a3a6a; }
  .timeline-controls button.active { background: #0ff; color: #1a1a2e; }
  .timeline-controls select { background: #0f3460; border: 1px solid #0f3460; color: #e0e0e0;
    padding: 2px 6px; border-radius: 3px; font-family: monospace; font-size: 12px; }
  .timeline-events { max-height: 280px; overflow-y: auto; }
  .tl-event { display: flex; gap: 8px; padding: 2px 4px; font-size: 12px; border-radius: 2px; cursor: pointer; }
  .tl-event:hover { background: rgba(15,52,96,0.6); }
  .tl-event.selected { background: #0f3460; }
  .tl-event .tl-time { color: #0ff; min-width: 110px; }
  .tl-event .tl-kind { min-width: 120px; }
  .tl-event .tl-detail { color: #888; }
  /* Post-mortem file loader */
  #file-loader { display: none; margin-bottom: 12px; }
  #file-loader.visible { display: block; }
  #file-loader input[type="file"] { display: none; }
  .file-btn { background: #0f3460; border: 1px solid #0ff; color: #0ff; padding: 6px 16px;
    border-radius: 3px; cursor: pointer; font-family: monospace; font-size: 13px; }
  .file-btn:hover { background: #1a3a6a; }
  .mode-badge { display: inline-block; background: #0f3460; border-radius: 3px; padding: 1px 8px;
    font-size: 11px; margin-left: 8px; }
  .mode-badge.live { color: #4caf50; border: 1px solid #4caf50; }
  .mode-badge.file { color: #ff9800; border: 1px solid #ff9800; }
  /* Export */
  .export-btn { background: #0f3460; border: 1px solid #0f3460; color: #888; padding: 2px 10px;
    border-radius: 3px; cursor: pointer; font-family: monospace; font-size: 11px; float: right; }
  .export-btn:hover { color: #e0e0e0; }
</style>
</head>
<body>
<h1>Asupersync Debug Dashboard <span id="mode-badge" class="mode-badge">detecting...</span></h1>
<div class="meta">
  <span id="refresh-info"></span> | <span id="last-update">loading...</span>
  <button class="export-btn" id="export-btn" title="Export current snapshot as JSON">Export JSON</button>
</div>
<div id="error"></div>
<div id="file-loader" class="section">
  <h2>Load Trace Data</h2>
  <p style="margin-bottom:8px;color:#888;font-size:12px">
    Open a snapshot JSON or trace file for post-mortem analysis.
  </p>
  <label class="file-btn" for="trace-file">Choose File</label>
  <input type="file" id="trace-file" accept=".json">
  <span id="file-name" style="margin-left:8px;color:#888;font-size:12px"></span>
</div>
<div class="toolbar">
  <input type="text" id="search" placeholder="Search by name or ID...">
  <label><input type="checkbox" id="hide-closed"> Hide closed/completed</label>
  <label><input type="checkbox" id="errors-only"> Errors only</label>
</div>
<div class="section">
  <h2>Summary</h2>
  <div id="summary">Loading...</div>
</div>
<div class="section">
  <h2>Region / Task Hierarchy</h2>
  <div id="tree" class="tree">Loading...</div>
</div>
<div class="section" id="detail">
  <h2>Details</h2>
  <pre id="detail-content"></pre>
</div>
<div class="section">
  <h2>Event Timeline</h2>
  <div class="timeline-controls">
    <button id="tl-play" title="Play/pause">&#9654;</button>
    <button id="tl-step-back" title="Step back">&#9664;&#9664;</button>
    <button id="tl-step-fwd" title="Step forward">&#9654;&#9654;</button>
    <select id="tl-filter">
      <option value="all">All events</option>
      <option value="task">Task events</option>
      <option value="region">Region events</option>
      <option value="obligation">Obligation events</option>
      <option value="cancel">Cancellation</option>
      <option value="io">I/O events</option>
    </select>
    <span id="tl-info" style="color:#888;font-size:11px"></span>
  </div>
  <div id="timeline-bar" class="timeline-bar">
    <div id="tl-fill" class="timeline-fill"></div>
    <div id="tl-cursor" class="timeline-cursor"></div>
  </div>
  <div class="timeline-labels">
    <span id="tl-start">--</span>
    <span id="tl-end">--</span>
  </div>
  <div id="timeline-events" class="timeline-events">Loading...</div>
</div>
<script>
// ===== Configuration =====
var CONFIG = {
  refreshMs: parseInt(new URLSearchParams(location.search).get('refresh') || '2000'),
  mode: 'detecting' // 'live' or 'file'
};

var prevSnap = null;
var collapsed = {};
var selected = null;

function esc(s) { var d = document.createElement('div'); d.textContent = String(s); return d.innerHTML; }

function stateOf(obj) {
  if (!obj || !obj.state) return 'Unknown';
  return typeof obj.state === 'string' ? obj.state : Object.keys(obj.state)[0];
}

function stateIcon(s) {
  var m = { Open:'\u25CF', Running:'\u25CF', Created:'\u25CB',
    Closing:'\u26A0\uFE0F', Cancelling:'\u26A0\uFE0F', CancelRequested:'\u26A0\uFE0F',
    Draining:'\uD83D\uDD04', Finalizing:'\u23F3',
    Closed:'\u2713', Completed:'\u2713',
    Reserved:'\u25CB', Committed:'\u2713', Aborted:'\u2717', Leaked:'\u2717',
    Panicked:'\u2717' };
  return m[s] || '\u25CF';
}

function stateClass(s) { return 'st-' + (s || 'unknown').toLowerCase(); }

// ===== Tree =====
function buildTree(snap) {
  var regionMap = {};
  snap.regions.forEach(function(r) { regionMap[r.id.index] = r; });
  var tasksByRegion = {};
  snap.tasks.forEach(function(t) {
    var rid = t.region_id.index;
    if (!tasksByRegion[rid]) tasksByRegion[rid] = [];
    tasksByRegion[rid].push(t);
  });
  var obligMap = {};
  snap.obligations.forEach(function(o) { obligMap[o.id.index] = o; });
  var roots = snap.regions.filter(function(r) { return !r.parent_id; });
  var childRegions = {};
  snap.regions.forEach(function(r) {
    if (r.parent_id) {
      var pid = r.parent_id.index;
      if (!childRegions[pid]) childRegions[pid] = [];
      childRegions[pid].push(r);
    }
  });
  return { regionMap: regionMap, tasksByRegion: tasksByRegion, obligMap: obligMap,
    roots: roots, childRegions: childRegions };
}

function matchesFilter(state) {
  var hideClosed = document.getElementById('hide-closed').checked;
  var errorsOnly = document.getElementById('errors-only').checked;
  var s = state.toLowerCase();
  if (hideClosed && (s === 'closed' || s === 'completed')) return false;
  if (errorsOnly && s !== 'panicked' && s !== 'leaked' && s !== 'aborted' && s !== 'error') return false;
  return true;
}

function matchesSearch(text) {
  var q = document.getElementById('search').value.toLowerCase();
  if (!q) return true;
  return text.toLowerCase().indexOf(q) !== -1;
}

function renderRegion(r, tree, depth) {
  var st = stateOf(r);
  var label = 'Region[' + r.id.index + ']' + (r.name ? ' ' + r.name : '');
  if (!matchesSearch(label + ' ' + st)) return '';
  if (!matchesFilter(st)) return '';
  var key = 'r-' + r.id.index;
  var isCollapsed = collapsed[key];
  var children = tree.childRegions[r.id.index] || [];
  var tasks = tree.tasksByRegion[r.id.index] || [];
  var hasChildren = children.length > 0 || tasks.length > 0;
  var toggle = hasChildren ? (isCollapsed ? '\u25B6' : '\u25BC') : '\u00B7';
  var sel = selected === key ? ' selected' : '';
  var h = '<div class="tree-node" data-key="' + key + '">';
  h += '<div class="tree-row' + sel + '" data-key="' + key + '" data-type="region" data-id="' + r.id.index + '">';
  h += '<span class="toggle" data-key="' + key + '">' + toggle + '</span>';
  h += '<span class="icon ' + stateClass(st) + '">' + stateIcon(st) + '</span>';
  h += '<span class="node-id">' + esc(label) + '</span>';
  h += ' <span class="node-state ' + stateClass(st) + '">(' + esc(st) + ')</span>';
  h += ' <span class="node-extra">[' + r.child_count + ' children, ' + r.task_count + ' tasks]</span>';
  h += '</div>';
  if (hasChildren) {
    h += '<div class="tree-children' + (isCollapsed ? ' collapsed' : '') + '">';
    children.forEach(function(c) { h += renderRegion(c, tree, depth + 1); });
    tasks.forEach(function(t) { h += renderTask(t, tree); });
    h += '</div>';
  }
  h += '</div>';
  return h;
}

function renderTask(t, tree) {
  var st = stateOf(t);
  var label = 'Task[' + t.id.index + ']' + (t.name ? ' ' + t.name : '');
  if (!matchesSearch(label + ' ' + st)) return '';
  if (!matchesFilter(st)) return '';
  var key = 't-' + t.id.index;
  var hasObligs = t.obligations && t.obligations.length > 0;
  var isCollapsed = collapsed[key];
  var toggle = hasObligs ? (isCollapsed ? '\u25B6' : '\u25BC') : '\u00B7';
  var sel = selected === key ? ' selected' : '';
  var h = '<div class="tree-node" data-key="' + key + '">';
  h += '<div class="tree-row' + sel + '" data-key="' + key + '" data-type="task" data-id="' + t.id.index + '">';
  h += '<span class="toggle" data-key="' + key + '">' + toggle + '</span>';
  h += '<span class="icon ' + stateClass(st) + '">' + stateIcon(st) + '</span>';
  h += '<span class="node-id">' + esc(label) + '</span>';
  h += ' <span class="node-state ' + stateClass(st) + '">(' + esc(st) + ')</span>';
  h += ' <span class="node-extra">polls:' + t.poll_count + '</span>';
  h += '</div>';
  if (hasObligs) {
    h += '<div class="tree-children' + (isCollapsed ? ' collapsed' : '') + '">';
    t.obligations.forEach(function(oid) {
      var o = tree.obligMap[oid.index];
      if (o) h += renderObligation(o);
    });
    h += '</div>';
  }
  h += '</div>';
  return h;
}

function renderObligation(o) {
  var st = stateOf(o);
  if (!matchesFilter(st)) return '';
  var key = 'o-' + o.id.index;
  var sel = selected === key ? ' selected' : '';
  return '<div class="tree-node" data-key="' + key + '">' +
    '<div class="tree-row' + sel + '" data-key="' + key + '" data-type="obligation" data-id="' + o.id.index + '">' +
    '<span class="toggle">\u00B7</span>' +
    '<span class="icon ' + stateClass(st) + '">' + stateIcon(st) + '</span>' +
    '<span class="node-id">Obligation[' + o.id.index + ']</span>' +
    ' <span class="node-state ' + stateClass(st) + '">(' + esc(st) + ')</span>' +
    '</div></div>';
}

function renderTree(snap) {
  var tree = buildTree(snap);
  if (tree.roots.length === 0 && snap.tasks.length === 0) {
    return '<div class="empty">No regions or tasks</div>';
  }
  var h = '';
  tree.roots.forEach(function(r) { h += renderRegion(r, tree, 0); });
  var renderedRegions = new Set(snap.regions.map(function(r) { return r.id.index; }));
  snap.tasks.forEach(function(t) {
    if (!renderedRegions.has(t.region_id.index)) {
      h += renderTask(t, tree);
    }
  });
  return h || '<div class="empty">All items filtered out</div>';
}

// ===== Render =====
function render(snap) {
  document.getElementById('last-update').textContent = 'ts=' + snap.timestamp + ' | ' + new Date().toISOString();
  document.getElementById('summary').innerHTML =
    '<span class="counter">Regions: ' + snap.regions.length + '</span>' +
    '<span class="counter">Tasks: ' + snap.tasks.length + '</span>' +
    '<span class="counter">Obligations: ' + snap.obligations.length + '</span>' +
    '<span class="counter">Events: ' + snap.recent_events.length + '</span>';

  document.getElementById('tree').innerHTML = renderTree(snap);
  renderTimeline(snap);
  prevSnap = snap;
}

// ===== Tree interaction =====
document.getElementById('tree').addEventListener('click', function(ev) {
  var tgt = ev.target;
  if (tgt.classList.contains('toggle')) {
    var key = tgt.getAttribute('data-key');
    collapsed[key] = !collapsed[key];
    if (prevSnap) render(prevSnap);
    return;
  }
  var row = tgt.closest('.tree-row');
  if (row) {
    selected = row.getAttribute('data-key');
    showDetail(row.getAttribute('data-type'), row.getAttribute('data-id'));
    if (prevSnap) render(prevSnap);
  }
});

function showDetail(type, id) {
  if (!prevSnap) return;
  var obj = null;
  if (type === 'region') obj = prevSnap.regions.find(function(r) { return String(r.id.index) === id; });
  else if (type === 'task') obj = prevSnap.tasks.find(function(t) { return String(t.id.index) === id; });
  else if (type === 'obligation') obj = prevSnap.obligations.find(function(o) { return String(o.id.index) === id; });
  var panel = document.getElementById('detail');
  if (obj) {
    panel.classList.add('visible');
    document.getElementById('detail-content').textContent = JSON.stringify(obj, null, 2);
  } else {
    panel.classList.remove('visible');
  }
}

document.getElementById('search').addEventListener('input', function() { if (prevSnap) render(prevSnap); });
document.getElementById('hide-closed').addEventListener('change', function() { if (prevSnap) render(prevSnap); });
document.getElementById('errors-only').addEventListener('change', function() { if (prevSnap) render(prevSnap); });

// ===== Timeline =====
var tlPlaying = false;
var tlCursorIdx = -1;
var tlSelectedEvt = null;

function eventCategory(kind) {
  var k = typeof kind === 'string' ? kind : Object.keys(kind)[0];
  if (k.indexOf('Cancel') >= 0) return 'cancel';
  if (k.indexOf('Region') >= 0) return 'region';
  if (k.indexOf('Obligation') >= 0) return 'obligation';
  if (k.indexOf('Io') >= 0 || k.indexOf('IO') >= 0) return 'io';
  return 'task';
}

function eventKindStr(kind) {
  return typeof kind === 'string' ? kind : Object.keys(kind)[0];
}

function fmtNs(ns) {
  if (ns === 0 || ns === undefined) return '0';
  var s = ns / 1e9;
  var ms = ns / 1e6;
  if (s >= 1) return s.toFixed(3) + 's';
  return ms.toFixed(3) + 'ms';
}

function eventDataStr(data) {
  if (!data || data === 'None') return '';
  if (typeof data === 'object') {
    if (data.Task) return 'Task[' + data.Task.task.index + '] Region[' + data.Task.region.index + ']';
    if (data.Region) return 'Region[' + data.Region.region.index + ']';
    if (data.Obligation) return 'Oblig[' + data.Obligation.obligation.index + '] Task[' + data.Obligation.task.index + ']';
  }
  return '';
}

function filterEvents(events) {
  var f = document.getElementById('tl-filter').value;
  if (f === 'all') return events;
  return events.filter(function(e) { return eventCategory(e.kind) === f; });
}

function renderTimeline(snap) {
  var events = snap.recent_events || [];
  var filtered = filterEvents(events);
  var bar = document.getElementById('timeline-bar');
  var barW = bar.offsetWidth || 600;
  bar.querySelectorAll('.timeline-marker').forEach(function(m) { m.remove(); });
  if (events.length === 0) {
    document.getElementById('tl-start').textContent = '--';
    document.getElementById('tl-end').textContent = '--';
    document.getElementById('tl-info').textContent = '0 events';
    document.getElementById('timeline-events').innerHTML = '<div class="empty">No events</div>';
    return;
  }
  var minT = events[0].time;
  var maxT = events[events.length - 1].time;
  var span = maxT - minT || 1;
  document.getElementById('tl-start').textContent = fmtNs(minT);
  document.getElementById('tl-end').textContent = fmtNs(maxT);
  document.getElementById('tl-info').textContent = filtered.length + ' / ' + events.length + ' events';
  filtered.forEach(function(e) {
    var pct = ((e.time - minT) / span) * 100;
    var marker = document.createElement('div');
    marker.className = 'timeline-marker ' + eventCategory(e.kind);
    marker.style.left = pct + '%';
    marker.title = eventKindStr(e.kind) + ' @' + fmtNs(e.time);
    bar.appendChild(marker);
  });
  var cursor = document.getElementById('tl-cursor');
  if (tlCursorIdx >= 0 && tlCursorIdx < filtered.length) {
    var ce = filtered[tlCursorIdx];
    cursor.style.left = (((ce.time - minT) / span) * 100) + '%';
    cursor.style.display = 'block';
  } else {
    cursor.style.left = '100%';
    cursor.style.display = 'block';
  }
  document.getElementById('tl-fill').style.width = '100%';
  var h = '';
  filtered.forEach(function(e, i) {
    var sel = tlSelectedEvt === e.seq ? ' selected' : '';
    h += '<div class="tl-event' + sel + '" data-idx="' + i + '" data-seq="' + e.seq + '">';
    h += '<span class="tl-time">' + fmtNs(e.time) + '</span>';
    h += '<span class="tl-kind ' + stateClass(eventKindStr(e.kind)) + '">' + esc(eventKindStr(e.kind)) + '</span>';
    h += '<span class="tl-detail">' + esc(eventDataStr(e.data)) + '</span>';
    h += '</div>';
  });
  document.getElementById('timeline-events').innerHTML = h || '<div class="empty">All events filtered</div>';
}

document.getElementById('timeline-bar').addEventListener('click', function(ev) {
  if (!prevSnap || !prevSnap.recent_events.length) return;
  var bar = document.getElementById('timeline-bar');
  var rect = bar.getBoundingClientRect();
  var pct = (ev.clientX - rect.left) / rect.width;
  var events = filterEvents(prevSnap.recent_events);
  var idx = Math.round(pct * (events.length - 1));
  tlCursorIdx = Math.max(0, Math.min(idx, events.length - 1));
  renderTimeline(prevSnap);
});

document.getElementById('timeline-events').addEventListener('click', function(ev) {
  var row = ev.target.closest('.tl-event');
  if (!row || !prevSnap) return;
  var seq = parseInt(row.getAttribute('data-seq'), 10);
  tlSelectedEvt = seq;
  var evt = prevSnap.recent_events.find(function(e) { return e.seq === seq; });
  if (evt) {
    var panel = document.getElementById('detail');
    panel.classList.add('visible');
    document.getElementById('detail-content').textContent = JSON.stringify(evt, null, 2);
  }
  renderTimeline(prevSnap);
});

var playInterval = null;
document.getElementById('tl-play').addEventListener('click', function() {
  tlPlaying = !tlPlaying;
  this.textContent = tlPlaying ? '\u23F8' : '\u25B6';
  this.classList.toggle('active', tlPlaying);
  if (tlPlaying) {
    if (tlCursorIdx < 0) tlCursorIdx = 0;
    playInterval = setInterval(function() {
      if (!prevSnap) return;
      var events = filterEvents(prevSnap.recent_events);
      if (tlCursorIdx < events.length - 1) {
        tlCursorIdx++;
        renderTimeline(prevSnap);
      } else {
        tlPlaying = false;
        document.getElementById('tl-play').textContent = '\u25B6';
        document.getElementById('tl-play').classList.remove('active');
        clearInterval(playInterval);
      }
    }, 200);
  } else { clearInterval(playInterval); }
});

document.getElementById('tl-step-back').addEventListener('click', function() {
  if (!prevSnap) return;
  var events = filterEvents(prevSnap.recent_events);
  if (tlCursorIdx > 0) { tlCursorIdx--; renderTimeline(prevSnap); }
  else if (tlCursorIdx < 0 && events.length > 0) { tlCursorIdx = events.length - 1; renderTimeline(prevSnap); }
});
document.getElementById('tl-step-fwd').addEventListener('click', function() {
  if (!prevSnap) return;
  var events = filterEvents(prevSnap.recent_events);
  if (tlCursorIdx < events.length - 1) { tlCursorIdx++; renderTimeline(prevSnap); }
});

document.getElementById('tl-filter').addEventListener('change', function() {
  tlCursorIdx = -1;
  if (prevSnap) renderTimeline(prevSnap);
});

// ===== Export =====
document.getElementById('export-btn').addEventListener('click', function() {
  if (!prevSnap) return;
  var blob = new Blob([JSON.stringify(prevSnap, null, 2)], { type: 'application/json' });
  var url = URL.createObjectURL(blob);
  var a = document.createElement('a');
  a.href = url;
  a.download = 'asupersync-snapshot-' + prevSnap.timestamp + '.json';
  a.click();
  URL.revokeObjectURL(url);
});

// ===== Post-mortem file loader =====
document.getElementById('trace-file').addEventListener('change', function(ev) {
  var file = ev.target.files[0];
  if (!file) return;
  document.getElementById('file-name').textContent = file.name;
  var reader = new FileReader();
  reader.onload = function(e) {
    try {
      var data = JSON.parse(e.target.result);
      // Accept either a RuntimeSnapshot directly or an array of events.
      if (data.timestamp !== undefined && data.regions !== undefined) {
        render(data);
      } else if (Array.isArray(data)) {
        // Treat as event list.
        render({ timestamp: 0, regions: [], tasks: [], obligations: [], recent_events: data });
      } else {
        document.getElementById('error').textContent = 'Unrecognized JSON format';
        document.getElementById('error').style.display = 'block';
      }
    } catch (err) {
      document.getElementById('error').textContent = 'Parse error: ' + err;
      document.getElementById('error').style.display = 'block';
    }
  };
  reader.readAsText(file);
});

// ===== Mode detection and polling =====
var pollTimer = null;

function setMode(mode) {
  CONFIG.mode = mode;
  var badge = document.getElementById('mode-badge');
  badge.textContent = mode === 'live' ? 'LIVE' : 'FILE';
  badge.className = 'mode-badge ' + mode;
  if (mode === 'live') {
    document.getElementById('refresh-info').textContent = 'Auto-refresh: ' + (CONFIG.refreshMs / 1000) + 's';
    document.getElementById('file-loader').classList.remove('visible');
  } else {
    document.getElementById('refresh-info').textContent = 'Post-mortem mode';
    document.getElementById('file-loader').classList.add('visible');
    document.getElementById('summary').textContent = 'Load a snapshot or trace file to begin.';
    document.getElementById('tree').innerHTML = '<div class="empty">No data loaded</div>';
    document.getElementById('timeline-events').innerHTML = '<div class="empty">No events</div>';
  }
}

function poll() {
  fetch('/debug/snapshot')
    .then(function(r) { return r.json(); })
    .then(function(snap) {
      document.getElementById('error').style.display = 'none';
      render(snap);
    })
    .catch(function(err) {
      document.getElementById('error').textContent = 'Fetch error: ' + err;
      document.getElementById('error').style.display = 'block';
    });
}

function startLive() {
  setMode('live');
  poll();
  pollTimer = setInterval(poll, CONFIG.refreshMs);
}

// Detect mode: try fetching from the server.
if (location.protocol === 'file:') {
  setMode('file');
} else {
  fetch('/debug/snapshot')
    .then(function(r) {
      if (r.ok) {
        return r.json().then(function(snap) {
          setMode('live');
          render(snap);
          pollTimer = setInterval(poll, CONFIG.refreshMs);
        });
      } else {
        setMode('file');
      }
    })
    .catch(function() {
      setMode('file');
    });
}
</script>
</body>
</html>