Pipeline DAG Builder

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<!doctype html>
<html lang="en" data-theme="">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Pipeline DAG Builder</title>
<style>
/* ── sloprun design tokens (verbatim from demos/tokens.css) ───────────────── */
:root {
  --bg: #F6F6F3;          /* neutral paper, not cream */
  --surface: #FFFFFF;
  --ink: #1A1D21;
  --muted: #5A6068;
  --line: #E3E2DC;
  --accent: #C05600;      /* phosphor amber, darkened for light bg */
  --accent-soft: #FFF3E6;
  --run: #1A7F37;         /* earned green */
  --run-soft: #E7F4EA;
  --danger: #C93C37;
  --radius: 10px;
  --font-sans: system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: ui-monospace, "SF Mono", "Cascadia Code", Menlo, Consolas, monospace;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #14161A; --surface: #1C1F26; --ink: #E8E6E1; --muted: #9AA0A8;
    --line: #2A2E36; --accent: #FFB454; --accent-soft: #2A2118;
    --run: #3FB950; --run-soft: #16281B; --danger: #F47067;
  }
}
:root[data-theme="dark"] {
  --bg: #14161A; --surface: #1C1F26; --ink: #E8E6E1; --muted: #9AA0A8;
  --line: #2A2E36; --accent: #FFB454; --accent-soft: #2A2118;
  --run: #3FB950; --run-soft: #16281B; --danger: #F47067;
}
body { background: var(--bg); color: var(--ink); font-family: var(--font-sans); }
/* ── end token block ──────────────────────────────────────────────────────── */

/* native controls (range, checkbox, scrollbars) follow the resolved theme */
:root, :root[data-theme="light"] { color-scheme: light; }
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) { color-scheme: dark; } }
:root[data-theme="dark"] { color-scheme: dark; }

:root { --danger-soft: var(--accent-soft); }
:root { --danger-soft: color-mix(in srgb, var(--danger) 9%, var(--surface)); }

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; min-height: 100vh; overflow-x: hidden; }
.sr { position:absolute; width:1px; height:1px; padding:0; margin:-1px; overflow:hidden;
      clip:rect(0 0 0 0); white-space:nowrap; border:0; }

.wrap { max-width: 1280px; margin: 0 auto; padding: 20px 16px 26px; }

header h1 { margin: 0 0 5px; font-size: 19px; font-weight: 650; letter-spacing: -.01em; }
header p  { margin: 0; font-size: 13.5px; line-height: 1.5; color: var(--muted); max-width: 68ch; }
header .kbd { font: 600 12px var(--font-mono); color: var(--ink);
              background: var(--surface); border: 1px solid var(--line);
              border-radius: 5px; padding: 1px 5px; }

/* ── controls ─────────────────────────────────────────────────────────────── */
.bar { display:flex; flex-wrap:wrap; align-items:center; gap:8px; margin:16px 0 10px; }
.grow { flex: 1 1 8px; }
.btn { font: 600 13px/1 var(--font-sans); color: var(--ink); background: var(--surface);
       border: 1px solid var(--line); border-radius: 8px; padding: 9px 12px;
       display: inline-flex; align-items: center; gap: 6px; cursor: pointer;
       white-space: nowrap; transition: border-color .12s, color .12s, background .12s; }
.btn:hover { border-color: var(--accent); color: var(--accent); }
.btn:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.btn[aria-pressed="true"] { border-color: var(--accent); color: var(--accent); background: var(--accent-soft); }
.btn.primary { background: var(--accent); border-color: var(--accent); color: var(--surface); }
.btn.primary:hover { filter: brightness(1.08); color: var(--surface); }
.btn.stop { background: var(--danger); border-color: var(--danger); color: var(--surface); }
.btn.stop:hover { color: var(--surface); filter: brightness(1.08); }
.btn.sm { padding: 6px 9px; font-size: 12px; }
.btn .gl { font-size: 11px; line-height: 1; }

form.add { display: flex; gap: 6px; align-items: center; flex: 0 1 320px; min-width: 190px; }
input[type=text] { flex: 1 1 auto; min-width: 0; font: 500 13px var(--font-mono);
  color: var(--ink); background: var(--surface); border: 1px solid var(--line);
  border-radius: 8px; padding: 9px 10px; }
input[type=text]::placeholder { color: var(--muted); opacity: .8; }
input[type=text]:focus-visible { outline: 2px solid var(--accent); outline-offset: 1px; border-color: var(--accent); }

/* ── status strip ─────────────────────────────────────────────────────────── */
.strip { display:flex; flex-wrap:wrap; align-items:center; gap:8px 14px;
  font: 500 11.5px var(--font-mono); color: var(--muted);
  border: 1px solid var(--line); background: var(--surface);
  border-radius: var(--radius); padding: 9px 12px; }
.pill { font: 650 11px var(--font-mono); letter-spacing:.1em; padding: 3px 8px;
  border-radius: 999px; border: 1px solid var(--line); color: var(--muted); }
.pill[data-s="RUNNING"] { color: var(--accent); border-color: var(--accent); background: var(--accent-soft); }
.pill[data-s="OK"]      { color: var(--run);    border-color: var(--run);    background: var(--run-soft); }
.pill[data-s="FAILED"]  { color: var(--danger); border-color: var(--danger); background: var(--danger-soft); }
.strip b { color: var(--ink); font-weight: 600; }
.rail { display: inline-flex; gap: 3px; vertical-align: -1px; }
.rail i { width: 13px; height: 7px; border-radius: 2px; background: var(--line); display:block; }
.rail i.on   { background: var(--accent); }
.rail i.done { background: var(--run); }
.rail i.fell { background: var(--danger); }

/* ── banner ───────────────────────────────────────────────────────────────── */
.banner { margin: 10px 0 0; border: 1px solid var(--line); border-left-width: 3px;
  background: var(--surface); border-radius: 8px; padding: 10px 12px; font-size: 13px; }
.banner[hidden] { display: none; }
.banner .hd { font-weight: 600; display: flex; gap: 7px; align-items: baseline; }
.banner .mono { display: block; margin-top: 6px; font: 500 12px var(--font-mono);
  color: var(--ink); word-break: break-word; line-height: 1.6; }
.banner[data-k="err"]  { border-left-color: var(--danger); background: var(--danger-soft); }
.banner[data-k="err"] .hd { color: var(--danger); }
.banner[data-k="ok"]   { border-left-color: var(--run); background: var(--run-soft); }
.banner[data-k="ok"] .hd { color: var(--run); }
.banner[data-k="info"] { border-left-color: var(--accent); background: var(--accent-soft); }
.banner[data-k="info"] .hd { color: var(--accent); }
.banner[data-k="hint"] { border-left-color: var(--line); }
.banner[data-k="hint"] .hd { color: var(--muted); font-weight: 500; }
.banner[data-k="hint"] .mono { color: var(--muted); }

/* ── stage ────────────────────────────────────────────────────────────────── */
.stage { display: grid; grid-template-columns: minmax(0,1fr) 252px; gap: 14px; margin-top: 12px; }
#pbody { display: flex; flex-direction: column; gap: 11px; align-items: stretch; }
/* below this the graph needs the full width more than the panel needs a column */
@media (max-width: 1080px) { .stage { grid-template-columns: minmax(0,1fr); } }
@media (min-width: 601px) and (max-width: 1080px) {
  #pbody { display: grid; grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
           gap: 10px 20px; align-items: start; }
  #pbody > .hint { grid-column: 1 / -1; columns: 2; column-gap: 24px; padding-left: 19px; }
  .panel { gap: 10px; }
}

.canvas { position: relative; border: 1px solid var(--line); border-radius: var(--radius);
  background: var(--surface); overflow: hidden; height: clamp(378px, 46vh, 440px); }
svg.board { display:block; width:100%; height:100%; touch-action: pan-y; cursor: grab; }
svg.board.panning { cursor: grabbing; }
.zoom { position: absolute; right: 10px; bottom: 10px; display: flex; gap: 5px; }
.zoom .btn { background: var(--surface); box-shadow: 0 1px 3px rgba(0,0,0,.10); }

/* graph */
.dots { fill: var(--muted); opacity: .28; }
#ah path   { fill: var(--muted); fill-opacity: .5; }
#ah-a path { fill: var(--accent); fill-opacity: 1; }
#ah-x path { fill: var(--danger); fill-opacity: 1; }
.edge .hit  { stroke: transparent; stroke-width: 16; fill: none; pointer-events: stroke; cursor: pointer; }
.edge .wire { stroke: var(--muted); stroke-opacity: .5; stroke-width: 1.6; fill: none;
              marker-end: url(#ah); pointer-events: none; }
.edge:hover .wire, .edge.sel .wire { stroke: var(--accent); stroke-opacity: 1; stroke-width: 2.2; marker-end: url(#ah-a); }
.edge.live .wire { stroke: var(--accent); stroke-opacity: 1; stroke-width: 2.4; marker-end: url(#ah-a); }
.edge.crit .wire { stroke: var(--accent); stroke-opacity: .95; stroke-width: 2.4; stroke-dasharray: 7 4; marker-end: url(#ah-a); }
.edge.bad  .wire { stroke: var(--danger); stroke-opacity: 1; stroke-width: 2.6; marker-end: url(#ah-x); }
.edge .del { cursor: pointer; }
.edge .del circle { fill: var(--surface); stroke: var(--danger); stroke-width: 1.4; }
.edge .del text { fill: var(--danger); font: 700 11px var(--font-mono); }

.ghost { stroke: var(--accent); stroke-width: 2.2; stroke-dasharray: 6 5; fill: none;
         marker-end: url(#ah-a); pointer-events: none; }

.node { cursor: grab; touch-action: none; outline: none; }
.node.dragging { cursor: grabbing; }
.node .box { fill: var(--surface); stroke: var(--line); stroke-width: 1.5; }
.node .bar4 { fill: var(--line); }
.node .nm { fill: var(--ink); font: 600 13px var(--font-mono); }
.node .st { fill: var(--muted); font: 500 10px var(--font-mono); letter-spacing: .09em; }
.node .du { fill: var(--muted); font: 500 10px var(--font-mono); }
.node .ring { fill: none; stroke: var(--accent); stroke-width: 2; stroke-dasharray: 5 4; opacity: 0; }
.node.sel .ring { opacity: .95; }
.node:focus-visible .ring { opacity: 1; stroke-dasharray: none; stroke-width: 2.5; }
.node .halo { fill: none; stroke: var(--accent); stroke-width: 2; opacity: 0; }
.node .port { fill: var(--surface); stroke: var(--muted); stroke-width: 1.5; pointer-events: none; }
.node .portx { stroke: var(--muted); stroke-width: 1.5; pointer-events: none; }
.node .porthit { fill: transparent; cursor: crosshair; touch-action: none; }
.node:hover .port, .node.sel .port, .node:focus-visible .port { stroke: var(--accent); fill: var(--accent-soft); }
.node:hover .portx, .node.sel .portx, .node:focus-visible .portx { stroke: var(--accent); }
.node .porthit:hover + .port, .node .porthit:hover ~ .portx { stroke: var(--accent); }

.st-queued .box { stroke-dasharray: 5 4; }
.st-queued .st { fill: var(--muted); }
.st-run .box  { fill: var(--accent-soft); stroke: var(--accent); stroke-width: 2; }
.st-run .bar4 { fill: var(--accent); } .st-run .st { fill: var(--accent); } .st-run .du { fill: var(--accent); }
.st-run .halo { opacity: .55; animation: pulse 1.15s ease-out infinite; }
.st-ok .box   { fill: var(--run-soft); stroke: var(--run); }
.st-ok .bar4  { fill: var(--run); } .st-ok .st { fill: var(--run); } .st-ok .du { fill: var(--run); }
.st-fail .box { fill: var(--danger-soft); stroke: var(--danger); stroke-width: 2; }
.st-fail .bar4{ fill: var(--danger); } .st-fail .st { fill: var(--danger); } .st-fail .du { fill: var(--danger); }
.st-skip      { opacity: .66; }
.st-skip .box { stroke-dasharray: 3 4; }
.st-skip .st  { fill: var(--ink); }
.node.crit .box { stroke: var(--accent); stroke-width: 2; }
.node.bad .box  { stroke: var(--danger); stroke-width: 2.5; }
.node.willfail .st   { fill: var(--danger); }
.node.willfail .bar4 { fill: var(--danger); }
.node.willfail .box  { stroke-dasharray: 4 3; }
@keyframes pulse { 0% { opacity:.6; stroke-width:2; } 100% { opacity:0; stroke-width:9; } }

/* ── panel ────────────────────────────────────────────────────────────────── */
.panel { border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface);
  padding: 13px; display: flex; flex-direction: column; gap: 12px; align-self: start; }
.panel h2 { margin: 0; font-size: 11px; font-weight: 650; letter-spacing: .1em;
  text-transform: uppercase; color: var(--muted); font-family: var(--font-mono); }
.panel .hint { margin: 0; padding-left: 17px; font-size: 12.5px; line-height: 1.65; color: var(--muted); }
.panel .hint li { margin-bottom: 5px; }
.panel .hint b { color: var(--ink); font-weight: 600; }
.field { display: flex; flex-direction: column; gap: 5px; }
.field label { font: 600 10.5px var(--font-mono); letter-spacing: .09em;
  text-transform: uppercase; color: var(--muted); }
.row { display: flex; align-items: center; gap: 8px; justify-content: space-between; }
.chk { display: flex; align-items: center; gap: 8px; font-size: 12.5px; cursor: pointer; }
.chk input { accent-color: var(--danger); width: 15px; height: 15px; cursor: pointer; }
.chk input:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
input[type=range] { width: 100%; accent-color: var(--accent); }
input[type=range]:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }
.mono { font: 500 11.5px var(--font-mono); color: var(--muted); }
.mono b { color: var(--ink); font-weight: 600; }
.deps { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 4px; }
.deps li { display: flex; align-items: center; gap: 6px; justify-content: space-between;
  font: 500 11.5px var(--font-mono); background: var(--bg); border: 1px solid var(--line);
  border-radius: 6px; padding: 4px 4px 4px 8px; }
.deps li span { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.x { border: 0; background: transparent; color: var(--muted); cursor: pointer;
  font: 700 12px var(--font-mono); line-height: 1; padding: 3px 5px; border-radius: 5px; }
.x:hover { color: var(--danger); background: var(--danger-soft); }
.x:focus-visible { outline: 2px solid var(--accent); outline-offset: 1px; }
.legend { display: flex; flex-wrap: wrap; gap: 5px 12px; border-top: 1px solid var(--line); padding-top: 11px; }
.legend span { display: inline-flex; align-items: center; gap: 5px; font: 500 11px var(--font-mono); color: var(--muted); }
.sw { width: 9px; height: 9px; border-radius: 3px; border: 1.5px solid var(--line); background: var(--surface); }
.sw.ok { border-color: var(--run); background: var(--run-soft); }
.sw.rn { border-color: var(--accent); background: var(--accent-soft); }
.sw.fl { border-color: var(--danger); background: var(--danger-soft); }
.sw.sk { border-style: dashed; opacity: .6; }
.sep { border: 0; border-top: 1px solid var(--line); margin: 0; }

/* ── log ──────────────────────────────────────────────────────────────────── */
.logwrap { margin-top: 14px; border: 1px solid var(--line); border-radius: var(--radius);
  background: var(--surface); overflow: hidden; }
.loghd { display:flex; align-items:center; justify-content:space-between; gap:10px;
  padding: 8px 12px; border-bottom: 1px solid var(--line); }
.loghd h2 { margin:0; font: 650 10.5px var(--font-mono); letter-spacing:.11em;
  text-transform: uppercase; color: var(--muted); }
.log { margin: 0; padding: 9px 12px 11px; max-height: 196px; overflow: auto; }
.ln { display: grid; grid-template-columns: 58px 13px minmax(0,22ch) minmax(0,1fr); gap: 8px;
  font: 500 11.5px/1.75 var(--font-mono); color: var(--muted); }
.ln .t { color: var(--muted); opacity: .88; }
.ln .n { color: var(--ink); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.ln .d { white-space: nowrap; }
.ln.wide .n { grid-column: 3 / -1; }
.ln.wide .d { display: none; }
.ln.ok   .i, .ln.ok .d   { color: var(--run); }
.ln.fail .i, .ln.fail .d, .ln.fail .n { color: var(--danger); }
.ln.run  .i { color: var(--accent); }
.ln.info .n { color: var(--accent); }
.ln.skip { opacity: .9; }
.log .empty { font: 500 11.5px var(--font-mono); color: var(--muted); }

footer { margin-top: 18px; font: 500 11.5px var(--font-mono); color: var(--muted); }

@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; scroll-behavior: auto !important; }
  .st-run .halo { opacity: .45; stroke-width: 4; }
}
@media (max-width: 520px) {
  .ln { grid-template-columns: 50px 11px minmax(0,1fr) auto; gap: 6px; font-size: 11px; }
}
/* one column: the canvas gets the height the side panel used to take */
@media (max-width: 1080px) { .canvas { height: clamp(380px, 52vh, 500px); } }
/* on a phone, spend the vertical budget on the graph, not on prose */
@media (max-width: 560px) {
  header p { font-size: 13px; line-height: 1.45; }
  header p .wide { display: none; }
  .banner[data-k="hint"] .mono { display: none !important; }
  .strip { gap: 6px 11px; padding: 8px 10px; }
  .canvas { height: clamp(340px, 52vh, 460px); }
}
@media (max-width: 420px) {
  .wrap { padding: 16px 12px 22px; }
  .btn { padding: 8px 10px; font-size: 12.5px; }
  form.add { flex: 1 1 100%; }
}
</style>
</head>
<body>
<div class="wrap">

  <header>
    <h1>Pipeline DAG Builder</h1>
    <p>A data pipeline is a graph of tasks: each one waits for the ones it depends on.
       Wire tasks together, press <b>Run</b>, and watch the scheduler execute them in waves —
       everything that <em>can</em> go in parallel does. <span class="wide">Loop a dependency back on
       itself and the graph refuses it, and tells you exactly where the loop is.</span></p>
  </header>

  <div class="bar">
    <button class="btn primary" id="run" type="button"><span class="gl" aria-hidden="true">▶</span><span id="runlbl">Run pipeline</span></button>
    <button class="btn" id="reset" type="button">Reset</button>
    <button class="btn" id="tidy" type="button">Tidy layout</button>
    <button class="btn" id="seed" type="button">Reload example</button>
    <span class="grow"></span>
    <form class="add" id="addf">
      <label class="sr" for="newname">New task name</label>
      <input type="text" id="newname" placeholder="new_task_name" maxlength="32" autocomplete="off" spellcheck="false">
      <button class="btn" type="submit"><span class="gl" aria-hidden="true">＋</span>Add task</button>
    </form>
  </div>

  <div class="strip">
    <span class="pill" id="pill" data-s="IDLE">IDLE</span>
    <span><span class="rail" id="rail" aria-hidden="true"></span> <span id="wavetxt">wave 0/0</span></span>
    <span>tasks <b id="ntasks">0</b></span>
    <span>deps <b id="nedges">0</b></span>
    <span>waves <b id="nwaves">0</b></span>
    <span>critical path <b id="cpath">0.00s</b></span>
    <span class="grow"></span>
    <span id="addhint">↳ new tasks land unconnected</span>
  </div>

  <div class="banner" id="banner" role="status" data-k="hint">
    <div class="hd"><span id="bico" aria-hidden="true">✗</span><span id="btxt"></span></div>
    <span class="mono" id="bsub"></span>
  </div>

  <div class="stage">
    <div class="canvas">
      <svg class="board" id="board" role="application" aria-label="Pipeline graph editor. Tab to a task, then use arrow keys to move it, C to start a dependency, Enter to finish it, Delete to remove it.">
        <defs>
          <pattern id="dot" width="26" height="26" patternUnits="userSpaceOnUse">
            <circle class="dots" cx="1.2" cy="1.2" r="1.2"></circle>
          </pattern>
          <marker id="ah" viewBox="0 0 10 8" refX="9.2" refY="4" markerWidth="8" markerHeight="7" orient="auto-start-reverse">
            <path d="M0 0 L10 4 L0 8 z" fill="var(--muted)" fill-opacity=".5"></path>
          </marker>
          <marker id="ah-a" viewBox="0 0 10 8" refX="9.2" refY="4" markerWidth="8" markerHeight="7" orient="auto-start-reverse">
            <path d="M0 0 L10 4 L0 8 z" fill="var(--accent)"></path>
          </marker>
          <marker id="ah-x" viewBox="0 0 10 8" refX="9.2" refY="4" markerWidth="8" markerHeight="7" orient="auto-start-reverse">
            <path d="M0 0 L10 4 L0 8 z" fill="var(--danger)"></path>
          </marker>
        </defs>
        <g id="world">
          <rect x="-6000" y="-6000" width="12000" height="12000" fill="url(#dot)"></rect>
          <g id="glayer"></g>
          <g id="elayer"></g>
          <g id="nlayer"></g>
        </g>
      </svg>
      <div class="zoom">
        <button class="btn sm" id="zout" type="button" aria-label="Zoom out">−</button>
        <button class="btn sm" id="zin"  type="button" aria-label="Zoom in">＋</button>
        <button class="btn sm" id="zfit" type="button">Fit</button>
      </div>
    </div>

    <aside class="panel" id="panel">
      <h2 id="ptitle">How it works</h2>
      <div id="pbody"></div>
      <hr class="sep">
      <button class="btn sm" id="critbtn" type="button" aria-pressed="false">Highlight critical path</button>
      <div class="legend">
        <span><i class="sw"></i>queued</span>
        <span><i class="sw rn"></i>running</span>
        <span><i class="sw ok"></i>ok</span>
        <span><i class="sw fl"></i>failed</span>
        <span><i class="sw sk"></i>skipped</span>
      </div>
    </aside>
  </div>

  <div class="logwrap">
    <div class="loghd">
      <h2>scheduler log</h2>
      <span class="mono" id="logmeta">idle</span>
    </div>
    <div class="log" id="log"><div class="empty">press “Run pipeline” to execute the graph…</div></div>
  </div>

  <footer>demo · sloprun.dev</footer>
</div>

<script>
(function () {
"use strict";

/* ── theme bridge ───────────────────────────────────────────────────────── */
addEventListener("message", function (e) {
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var SVGNS = "http://www.w3.org/2000/svg";
var W = 152, H = 50;
var mqReduce = matchMedia("(prefers-reduced-motion: reduce)");

var $ = function (id) { return document.getElementById(id); };
var board = $("board"), world = $("world"),
    elayer = $("elayer"), nlayer = $("nlayer"), glayer = $("glayer");

/* ── model ──────────────────────────────────────────────────────────────── */
var nodes = [], edges = [], seq = 0;
var sel = null, selEdge = null, orient = "LR", showCrit = false;
var view = { x: 0, y: 0, k: 1 };
var runToken = 0, running = false, runState = { wave: 0, total: 0 }, runOk = null;
var connect = null;   // { from, gx, gy }
var touched = false;  // user has taken control of the viewport
var nodeEls = new Map(), edgeEls = new Map();

var SEED_N = [
  ["extract_orders", 1.80], ["extract_users", 0.60], ["clean_orders", 1.10],
  ["join_orders", 2.40], ["daily_revenue", 0.90], ["cohort_table", 1.50],
  ["publish_kpis", 0.40]
];
var SEED_E = [[0,2],[2,3],[1,3],[3,4],[3,5],[4,6],[5,6]];

function byId(id) { for (var i=0;i<nodes.length;i++) if (nodes[i].id === id) return nodes[i]; return null; }
function key(a,b) { return a + ">" + b; }
function hasEdge(a,b) { for (var i=0;i<edges.length;i++) if (edges[i].f===a && edges[i].t===b) return true; return false; }
function outOf(id) { var r=[]; for (var i=0;i<edges.length;i++) if (edges[i].f===id) r.push(edges[i].t); return r; }
function depsOf(id) { var r=[]; for (var i=0;i<edges.length;i++) if (edges[i].t===id) { var n=byId(edges[i].f); if(n) r.push(n); } return r; }

function loadSeed() {
  cancelRun();
  nodes = []; edges = []; seq = 0; sel = null; selEdge = null; showCrit = false;
  $("critbtn").setAttribute("aria-pressed", "false");
  var ids = SEED_N.map(function (s) {
    seq++;
    var n = { id: "t" + seq, name: s[0], dur: s[1], x: 0, y: 0, st: "idle", fail: false };
    nodes.push(n); return n.id;
  });
  SEED_E.forEach(function (e) { edges.push({ f: ids[e[0]], t: ids[e[1]] }); });
  runState = { wave: 0, total: 0 };
  pill("IDLE"); setRunBtn(false);
  autoLayout(); syncAll(); clearLog(); fit();
  banner(null);
}

/* ── graph algorithms ───────────────────────────────────────────────────── */
function ranks() {
  var order = topoOrder(); if (!order) return null;
  var r = {}; 
  order.forEach(function (n) {
    var m = 0, d = depsOf(n.id);
    for (var i=0;i<d.length;i++) m = Math.max(m, (r[d[i].id] || 0) + 1);
    r[n.id] = m;
  });
  return r;
}
function topoWaves() {
  var indeg = {}, adj = {};
  nodes.forEach(function (n) { indeg[n.id] = 0; adj[n.id] = []; });
  edges.forEach(function (e) { if (indeg[e.t] !== undefined && adj[e.f]) { indeg[e.t]++; adj[e.f].push(e.t); } });
  var cur = nodes.filter(function (n) { return indeg[n.id] === 0; }), waves = [], seen = 0;
  while (cur.length) {
    waves.push(cur); seen += cur.length;
    var next = [];
    cur.forEach(function (n) {
      adj[n.id].forEach(function (t) { if (--indeg[t] === 0) next.push(byId(t)); });
    });
    cur = next;
  }
  return { waves: waves, ok: seen === nodes.length };
}
function topoOrder() {
  var w = topoWaves(); if (!w.ok) return null;
  var out = []; w.waves.forEach(function (x) { out = out.concat(x); }); return out;
}
/* path from `s` to `g` following dependency direction; null if none */
function pathTo(s, g) {
  var q = [s], prev = {}, seenSet = {}; seenSet[s] = 1;
  while (q.length) {
    var c = q.shift();
    if (c === g) { var p = [c]; while (prev[c]) { c = prev[c]; p.unshift(c); } return p; }
    outOf(c).forEach(function (n) { if (!seenSet[n]) { seenSet[n] = 1; prev[n] = c; q.push(n); } });
  }
  return null;
}
function criticalPath() {
  var order = topoOrder(); if (!order || !order.length) return { ids: [], total: 0 };
  var fin = {}, prev = {};
  order.forEach(function (n) {
    var best = 0, bp = null, d = depsOf(n.id);
    for (var i=0;i<d.length;i++) if (fin[d[i].id] > best) { best = fin[d[i].id]; bp = d[i].id; }
    fin[n.id] = best + n.dur; prev[n.id] = bp;
  });
  var top = null;
  order.forEach(function (n) { if (top === null || fin[n.id] > fin[top]) top = n.id; });
  var ids = [], c = top;
  while (c) { ids.unshift(c); c = prev[c]; }
  return { ids: ids, total: fin[top] };
}

/* ── layout ─────────────────────────────────────────────────────────────── */
function gaps(o) { return o === "LR" ? { x: W + 58, y: H + 40 } : { x: W + 24, y: H + 38 }; }
/* footprint a given orientation would occupy, without moving anything */
function layoutSize(o) {
  var r = ranks(); if (!r || !nodes.length) return null;
  var counts = {}, maxR = 0;
  nodes.forEach(function (n) { var k = r[n.id]; maxR = Math.max(maxR, k); counts[k] = (counts[k] || 0) + 1; });
  var widest = 0;
  for (var k = 0; k <= maxR; k++) widest = Math.max(widest, counts[k] || 0);
  var g = gaps(o), R = maxR + 1, M = widest;
  return o === "LR"
    ? { w: (R - 1) * g.x + W, h: (M - 1) * g.y + H }
    : { w: (M - 1) * g.x + W, h: (R - 1) * g.y + H };
}
function autoLayout() {
  var r = ranks(); if (!r) return;
  var groups = {}, maxR = 0;
  nodes.forEach(function (n) {
    var k = r[n.id]; maxR = Math.max(maxR, k);
    (groups[k] = groups[k] || []).push(n);
  });
  var g0 = gaps(orient), GX = g0.x, GY = g0.y;
  var widest = 0;
  for (var k = 0; k <= maxR; k++) widest = Math.max(widest, (groups[k] || []).length);
  for (var k2 = 0; k2 <= maxR; k2++) {
    var g = groups[k2] || [];
    g.sort(function (a, b) { return orient === "LR" ? a.y - b.y : a.x - b.x; });
    for (var i = 0; i < g.length; i++) {
      var off = (widest - g.length) / 2;
      if (orient === "LR") { g[i].x = 40 + k2 * GX; g[i].y = 40 + (i + off) * GY; }
      else                 { g[i].y = 40 + k2 * GY; g[i].x = 40 + (i + off) * GX; }
    }
  }
}
function bbox() {
  if (!nodes.length) return { x: 0, y: 0, w: W, h: H };
  var x1=Infinity,y1=Infinity,x2=-Infinity,y2=-Infinity;
  nodes.forEach(function (n) {
    x1=Math.min(x1,n.x); y1=Math.min(y1,n.y); x2=Math.max(x2,n.x+W); y2=Math.max(y2,n.y+H);
  });
  return { x: x1, y: y1, w: x2-x1, h: y2-y1 };
}
function fit() {
  var rc = board.getBoundingClientRect(); if (!rc.width) return;
  touched = false;
  var b = bbox(), padX = 22, padT = 18, padB = 48;
  var k = Math.min((rc.width - padX * 2) / b.w, (rc.height - padT - padB) / b.h, 1.12);
  k = Math.max(0.26, Math.min(2.2, k));
  view.k = k;
  view.x = (rc.width - b.w * k) / 2 - b.x * k;
  view.y = padT + (rc.height - padT - padB - b.h * k) / 2 - b.y * k;
  applyView();
}
function applyView() {
  world.setAttribute("transform", "translate(" + view.x.toFixed(2) + "," + view.y.toFixed(2) + ") scale(" + view.k.toFixed(4) + ")");
}
function zoomBy(f) {
  touched = true;
  var rc = board.getBoundingClientRect(), cx = rc.width/2, cy = rc.height/2;
  var nk = Math.max(0.28, Math.min(2.2, view.k * f));
  view.x = cx - (cx - view.x) * (nk / view.k);
  view.y = cy - (cy - view.y) * (nk / view.k);
  view.k = nk; applyView();
}
function toWorld(clientX, clientY) {
  var rc = board.getBoundingClientRect();
  return { x: (clientX - rc.left - view.x) / view.k, y: (clientY - rc.top - view.y) / view.k };
}
function nodeAt(p) {
  for (var i = nodes.length - 1; i >= 0; i--) {
    var n = nodes[i];
    if (p.x >= n.x && p.x <= n.x + W && p.y >= n.y && p.y <= n.y + H) return n;
  }
  return null;
}

/* ── geometry ───────────────────────────────────────────────────────────── */
function anchor(a, b) {
  var cx = a.x + W/2, cy = a.y + H/2, dx = (b.x + W/2) - cx, dy = (b.y + H/2) - cy;
  if (!dx && !dy) return { x: cx, y: cy };
  var hw = W/2 + 3, hh = H/2 + 3;
  var t = Math.min(dx ? hw/Math.abs(dx) : Infinity, dy ? hh/Math.abs(dy) : Infinity);
  return { x: cx + dx*t, y: cy + dy*t };
}
function curve(p, q) {
  var dx = q.x - p.x, dy = q.y - p.y, c1, c2;
  if (Math.abs(dx) >= Math.abs(dy)) {
    var o = Math.max(26, Math.abs(dx) * 0.42);
    c1 = [p.x + o, p.y]; c2 = [q.x - o, q.y];
  } else {
    var o2 = Math.max(24, Math.abs(dy) * 0.42);
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  }
  return "M" + p.x.toFixed(1) + " " + p.y.toFixed(1) + "C" + c1[0].toFixed(1) + " " + c1[1].toFixed(1) +
         " " + c2[0].toFixed(1) + " " + c2[1].toFixed(1) + " " + q.x.toFixed(1) + " " + q.y.toFixed(1);
}
function portPos(n) {
  return orient === "LR" ? { x: n.x + W, y: n.y + H/2 } : { x: n.x + W/2, y: n.y + H };
}

/* ── DOM build ──────────────────────────────────────────────────────────── */
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}
function buildNode(n) {
  var g = mk("g", { "class": "node", tabindex: "0", role: "button" });
  g.dataset.id = n.id;
  var ttl = document.createElementNS(SVGNS, "title");
  g.appendChild(ttl);
  g.appendChild(mk("rect", { "class": "ring", x: -5, y: -5, width: W+10, height: H+10, rx: 14 }));
  g.appendChild(mk("rect", { "class": "halo", x: 0, y: 0, width: W, height: H, rx: 10 }));
  g.appendChild(mk("rect", { "class": "box", x: 0, y: 0, width: W, height: H, rx: 10 }));
  g.appendChild(mk("rect", { "class": "bar4", x: 1.6, y: 1.6, width: 3.2, height: H-3.2, rx: 1.6 }));
  var nm = mk("text", { "class": "nm", x: 13, y: 21 }); g.appendChild(nm);
  var st = mk("text", { "class": "st", x: 13, y: 38 }); g.appendChild(st);
  var du = mk("text", { "class": "du", x: W-12, y: 38, "text-anchor": "end" }); g.appendChild(du);
  var ph = mk("circle", { "class": "porthit", r: 14 });
  var pc = mk("circle", { "class": "port", r: 6.5 });
  var p1 = mk("line", { "class": "portx" });
  var p2 = mk("line", { "class": "portx" });
  g.appendChild(ph); g.appendChild(pc); g.appendChild(p1); g.appendChild(p2);
  nlayer.appendChild(g);
  var rec = { g: g, nm: nm, st: st, du: du, ttl: ttl, ph: ph, pc: pc, p1: p1, p2: p2 };
  nodeEls.set(n.id, rec);
  wireNode(g, n.id, ph);
  return rec;
}
function buildEdge(e) {
  var g = mk("g", { "class": "edge" });
  g.appendChild(mk("path", { "class": "hit" }));
  g.appendChild(mk("path", { "class": "wire" }));
  var del = mk("g", { "class": "del" });
  del.setAttribute("display", "none");
  del.appendChild(mk("circle", { r: 9 }));
  var t = mk("text", { "text-anchor": "middle", y: 3.8 }); t.textContent = "✕"; del.appendChild(t);
  g.appendChild(del);
  elayer.appendChild(g);
  var rec = { g: g, hit: g.children[0], wire: g.children[1], del: del };
  edgeEls.set(key(e.f, e.t), rec);
  g.children[0].addEventListener("pointerdown", function (ev) { ev.stopPropagation(); });
  g.children[0].addEventListener("click", function (ev) {
    ev.stopPropagation(); selEdge = key(e.f, e.t); sel = null; paint(); stats(); panel();
  });
  del.addEventListener("click", function (ev) {
    ev.stopPropagation(); removeEdge(e.f, e.t);
  });
  del.addEventListener("pointerdown", function (ev) { ev.stopPropagation(); });
  return rec;
}
function syncAll() {
  var live = {};
  nodes.forEach(function (n) { live[n.id] = 1; if (!nodeEls.has(n.id)) buildNode(n); });
  nodeEls.forEach(function (rec, id) { if (!live[id]) { rec.g.remove(); nodeEls.delete(id); } });
  var liveE = {};
  edges.forEach(function (e) { var k = key(e.f, e.t); liveE[k] = 1; if (!edgeEls.has(k)) buildEdge(e); });
  edgeEls.forEach(function (rec, k) { if (!liveE[k]) { rec.g.remove(); edgeEls.delete(k); } });
  // keep node DOM order matching model so z-order is stable
  nodes.forEach(function (n) { nlayer.appendChild(nodeEls.get(n.id).g); });
  geom(); paint(); stats(); panel();
}
function geom() {
  nodes.forEach(function (n) {
    var r = nodeEls.get(n.id); if (!r) return;
    r.g.setAttribute("transform", "translate(" + n.x.toFixed(1) + "," + n.y.toFixed(1) + ")");
    var p = orient === "LR" ? { x: W, y: H/2 } : { x: W/2, y: H };
    r.ph.setAttribute("cx", p.x); r.ph.setAttribute("cy", p.y);
    r.pc.setAttribute("cx", p.x); r.pc.setAttribute("cy", p.y);
    r.p1.setAttribute("x1", p.x-3); r.p1.setAttribute("x2", p.x+3);
    r.p1.setAttribute("y1", p.y);   r.p1.setAttribute("y2", p.y);
    r.p2.setAttribute("x1", p.x);   r.p2.setAttribute("x2", p.x);
    r.p2.setAttribute("y1", p.y-3); r.p2.setAttribute("y2", p.y+3);
  });
  edges.forEach(function (e) {
    var r = edgeEls.get(key(e.f, e.t)); if (!r) return;
    var a = byId(e.f), b = byId(e.t); if (!a || !b) return;
    var d = curve(anchor(a, b), anchor(b, a));
    r.wire.setAttribute("d", d); r.hit.setAttribute("d", d);
    if (r.del.getAttribute("display") !== "none") {
      try {
        var m = r.wire.getPointAtLength(r.wire.getTotalLength() / 2);
        r.del.setAttribute("transform", "translate(" + m.x.toFixed(1) + "," + m.y.toFixed(1) + ")");
      } catch (err) {}
    }
  });
}
var STLABEL = { idle: "READY", queued: "QUEUED", running: "RUNNING", ok: "OK", failed: "FAILED", skipped: "SKIPPED" };
function fitText(el, full, max) {
  el.textContent = full;
  var len;
  try { len = el.getComputedTextLength(); } catch (e) { return; }
  if (len <= max) return;
  var s = full;
  while (s.length > 3) {
    s = s.slice(0, -1);
    el.textContent = s + "…";
    try { if (el.getComputedTextLength() <= max) return; } catch (e) { return; }
  }
}
function paint() {
  var crit = showCrit ? criticalPath() : { ids: [] };
  var critSet = {}; crit.ids.forEach(function (i) { critSet[i] = 1; });
  nodes.forEach(function (n) {
    var r = nodeEls.get(n.id); if (!r) return;
    var cls = "node st-" + (n.st === "running" ? "run" : n.st === "failed" ? "fail" : n.st === "skipped" ? "skip" : n.st);
    if (sel === n.id) cls += " sel";
    if (n.fail) cls += " willfail";
    if (showCrit && critSet[n.id]) cls += " crit";
    if (n._bad) cls += " bad";
    r.g.setAttribute("class", cls);
    fitText(r.nm, n.name, W - 26);
    r.ttl.textContent = n.name + " · " + n.dur.toFixed(2) + "s";
    var lbl = STLABEL[n.st] || "READY";
    if (n.fail && (n.st === "idle" || n.st === "queued")) lbl = "WILL FAIL";
    r.st.textContent = lbl;
    r.du.textContent = n.dur.toFixed(2) + "s";
    r.g.setAttribute("aria-label", n.name + ", " + lbl.toLowerCase() + ", " +
      n.dur.toFixed(2) + " seconds, " + depsOf(n.id).length + " dependencies");
  });
  edges.forEach(function (e) {
    var r = edgeEls.get(key(e.f, e.t)); if (!r) return;
    var k = key(e.f, e.t), cls = "edge";
    if (selEdge === k) cls += " sel";
    if (e._bad) cls += " bad";
    else if (showCrit && critSet[e.f] && critSet[e.t] && crit.ids.indexOf(e.t) === crit.ids.indexOf(e.f) + 1) cls += " crit";
    var a = byId(e.f);
    if (a && a.st === "ok" && byId(e.t) && byId(e.t).st === "running") cls += " live";
    r.g.setAttribute("class", cls);
    r.del.setAttribute("display", selEdge === k ? "" : "none");
  });
  if (selEdge) geom();
}

/* ── stats strip ────────────────────────────────────────────────────────── */
function stats() {
  var w = topoWaves();
  $("ntasks").textContent = String(nodes.length);
  $("nedges").textContent = String(edges.length);
  $("nwaves").textContent = w.ok ? String(w.waves.length) : "—";
  var cp = criticalPath();
  $("cpath").textContent = cp.total.toFixed(2) + "s";
  var rail = $("rail"); rail.textContent = "";
  var tot = runState.total || (w.ok ? w.waves.length : 0);
  for (var i = 0; i < tot; i++) {
    var b = document.createElement("i");
    if (running) { if (i + 1 < runState.wave) b.className = "done"; else if (i + 1 === runState.wave) b.className = "on"; }
    else if (runState.wave && i < runState.wave)
      b.className = (runOk === false && runState.fail && i + 1 >= runState.fail) ? "fell" : "done";
    rail.appendChild(b);
  }
  $("wavetxt").textContent = "wave " + (runState.wave || 0) + "/" + tot;
  var s = sel ? byId(sel) : null;
  $("addhint").textContent = s ? "↳ new task wires after " + s.name : "↳ new tasks land unconnected";
}
function pill(s) { var p = $("pill"); p.dataset.s = s; p.textContent = s; }
function plural(n, word) { return n + " " + word + (n === 1 ? "" : "s"); }

/* ── banner ─────────────────────────────────────────────────────────────── */
/* the banner is a permanent status line: it never vanishes, it is only
   replaced. keeping the slot filled means the graph below never jumps. */
function banner(kind, text, sub) {
  var b = $("banner");
  if (!kind) {
    var w = topoWaves();
    kind = "hint";
    text = "Nothing running.";
    sub = "drag a task to move it  ·  drag ＋ from a task's edge onto another task to wire a dependency";
    if (!w.ok) { kind = "err"; text = "Graph has a cycle."; sub = "remove a dependency to break the loop"; }
  }
  b.dataset.k = kind;
  $("bico").textContent = kind === "err" ? "✗" : kind === "ok" ? "✓" : kind === "hint" ? "·" : "▸";
  $("btxt").textContent = text;
  $("bsub").textContent = sub || "";
  $("bsub").style.display = sub ? "" : "none";
}

/* ── log ────────────────────────────────────────────────────────────────── */
function clearLog() {
  var l = $("log"); l.textContent = "";
  var d = document.createElement("div"); d.className = "empty";
  d.textContent = "press “Run pipeline” to execute the graph…";
  l.appendChild(d);
  $("logmeta").textContent = "idle";
}
function clock(sec) {
  var m = Math.floor(sec / 60), s = sec - m * 60;
  return String(m).padStart(2, "0") + ":" + s.toFixed(2).padStart(5, "0");
}
function logLine(t, icon, name, detail, kind) {
  var l = $("log");
  var e = l.querySelector(".empty"); if (e) e.remove();
  var row = document.createElement("div");
  row.className = "ln " + (kind || "") + (detail ? "" : " wide");
  var a = document.createElement("span"); a.className = "t"; a.textContent = t === null ? "" : clock(t);
  var b = document.createElement("span"); b.className = "i"; b.textContent = icon;
  var c = document.createElement("span"); c.className = "n"; c.textContent = name;
  var d = document.createElement("span"); d.className = "d"; d.textContent = detail || "";
  row.appendChild(a); row.appendChild(b); row.appendChild(c); row.appendChild(d);
  l.appendChild(row);
  l.scrollTop = l.scrollHeight;
}

/* ── mutations ──────────────────────────────────────────────────────────── */
function cancelRun(silent) {
  if (!running) return;
  runToken++; running = false; runOk = null;
  nodes.forEach(function (n) { if (n.st === "queued" || n.st === "running") n.st = "idle"; });
  runState = { wave: 0, total: 0 };
  pill("IDLE"); setRunBtn(false);
  if (!silent) {
    logLine(null, "▪", "run cancelled", "", "");
    $("logmeta").textContent = "cancelled";
    banner("info", "Run cancelled.", "graph kept · press Run pipeline to start over");
  }
  paint(); stats();
}
function invalidateRun() {
  if (running) { cancelRun(true); }
  var dirty = nodes.some(function (n) { return n.st !== "idle"; }) || $("pill").textContent !== "IDLE";
  if (!dirty) return;
  nodes.forEach(function (n) { n.st = "idle"; });
  runState = { wave: 0, total: 0 }; runOk = null;
  pill("IDLE"); setRunBtn(false);
  if ($("log").querySelector(".ln")) logLine(null, "▪", "graph changed · previous run cleared", "", "");
  paint(); stats();
}
function addEdge(f, t, quiet) {
  if (f === t) { banner("err", "A task cannot depend on itself.", byId(f).name + " → " + byId(f).name); return false; }
  if (hasEdge(f, t)) { banner("info", "That dependency already exists.", byId(f).name + " → " + byId(t).name); return false; }
  var p = pathTo(t, f);
  if (p) {
    var names = p.map(function (i) { return byId(i).name; });
    var loop = [byId(f).name].concat(names).join("  →  ");
    banner("err", "Cycle rejected — a pipeline must be acyclic.", loop);
    flashCycle([f].concat(p));
    return false;
  }
  invalidateRun();
  edges.push({ f: f, t: t });
  syncAll();
  if (!quiet) banner("ok", "Dependency added.", byId(t).name + "  waits for  " + byId(f).name);
  return true;
}
function removeEdge(f, t) {
  invalidateRun();
  edges = edges.filter(function (e) { return !(e.f === f && e.t === t); });
  if (selEdge === key(f, t)) selEdge = null;
  syncAll();
}
function flashCycle(ids) {
  var mark = [];
  for (var i = 0; i < ids.length - 1; i++) {
    for (var j = 0; j < edges.length; j++)
      if (edges[j].f === ids[i] && edges[j].t === ids[i+1]) { edges[j]._bad = 1; mark.push(edges[j]); }
  }
  var ns = ids.map(byId).filter(Boolean);
  ns.forEach(function (n) { n._bad = 1; });
  paint();
  setTimeout(function () {
    mark.forEach(function (e) { delete e._bad; });
    ns.forEach(function (n) { delete n._bad; });
    paint();
  }, 2200);
}
function cleanName(raw) {
  return raw.trim().replace(/\s+/g, "_").replace(/[^A-Za-z0-9_.\-]/g, "").slice(0, 32);
}
function addTask(raw) {
  var name = cleanName(raw);
  if (!name) { banner("err", "Give the task a name.", "letters, digits, _ . - — up to 32 chars"); return; }
  if (nodes.some(function (n) { return n.name === name; })) {
    banner("err", "A task called " + name + " already exists.", "task names must be unique"); return;
  }
  invalidateRun();
  seq++;
  var s = sel ? byId(sel) : null;
  var n = { id: "t" + seq, name: name, dur: 1.00, st: "idle", fail: false, x: 0, y: 0 };
  if (s) {
    n.x = orient === "LR" ? s.x + W + 58 : s.x;
    n.y = orient === "LR" ? s.y : s.y + H + 46;
  } else {
    var b = bbox();
    n.x = b.x + b.w / 2 - W / 2; n.y = b.y + b.h + 40;
  }
  var guard = 0;
  while (guard++ < 40 && nodes.some(function (o) {
    return o !== n && Math.abs(o.x - n.x) < W - 6 && Math.abs(o.y - n.y) < H - 4;
  })) { n.y += H + 20; }
  nodes.push(n);
  if (s) edges.push({ f: s.id, t: n.id });
  sel = n.id; selEdge = null;
  syncAll(); fit();
  banner("ok", "Task added.", s ? name + "  waits for  " + s.name : name + "  ·  no dependencies yet");
}
function removeTask(id) {
  var n = byId(id); if (!n) return;
  invalidateRun();
  nodes = nodes.filter(function (x) { return x.id !== id; });
  edges = edges.filter(function (e) { return e.f !== id && e.t !== id; });
  if (sel === id) sel = null;
  selEdge = null;
  syncAll();
  if (!nodes.length) banner("info", "Graph is empty.", "type a name above and press Add task, or press Reload example");
  else banner("info", "Removed " + n.name + ".", "");
}

/* ── run ────────────────────────────────────────────────────────────────── */
function sleep(ms) {
  if (ms <= 0) return Promise.resolve();
  return new Promise(function (r) { setTimeout(r, ms); });
}
/* wall-clock the sim spends on a task. reduced-motion keeps the ordering
   (that IS the lesson) but compresses it, and CSS drops the pulsing halo. */
function pb(dur) {
  var base = Math.max(260, Math.min(900, dur * 420));
  return mqReduce.matches ? Math.round(base * 0.3) : base;
}
function setRunBtn(on) {
  var b = $("run");
  b.className = on ? "btn stop" : "btn primary";
  b.querySelector(".gl").textContent = on ? "■" : "▶";
  $("runlbl").textContent = on ? "Stop" : "Run pipeline";
}
async function runPipeline() {
  if (!nodes.length) { banner("err", "Nothing to run.", "add a task first"); return; }
  var tw = topoWaves();
  if (!tw.ok) { banner("err", "Graph has a cycle — cannot run.", "remove a dependency to break the loop"); return; }
  var tok = ++runToken;
  running = true; runOk = null; setRunBtn(true); pill("RUNNING");
  selEdge = null;
  nodes.forEach(function (n) { n.st = "queued"; });
  runState = { wave: 0, total: tw.waves.length, fail: null };
  $("log").textContent = ""; $("logmeta").textContent = "running…";
  paint(); stats();
  logLine(0, "▸", "run started · " + plural(nodes.length, "task") + " · " + plural(tw.waves.length, "wave"), "", "info");
  banner("info", "Scheduler started.", plural(nodes.length, "task") + " · " + plural(tw.waves.length, "wave"));

  var simT = 0, nOk = 0, nFail = 0, nSkip = 0;
  for (var w = 0; w < tw.waves.length; w++) {
    if (tok !== runToken) return;
    runState.wave = w + 1; stats();
    var wave = tw.waves[w], active = [];
    for (var i = 0; i < wave.length; i++) {
      var n = wave[i];
      var blocked = depsOf(n.id).some(function (d) { return d.st === "failed" || d.st === "skipped"; });
      if (blocked) { n.st = "skipped"; nSkip++; if (!runState.fail) runState.fail = w + 1;
        logLine(simT, "–", n.name, "SKIPPED upstream_failed", "skip"); }
      else active.push(n);
    }
    paint();
    if (!active.length) continue;
    logLine(simT, "▸", "wave " + (w + 1) + "/" + tw.waves.length + " · " + (active.length > 1 ? active.length + " tasks in parallel" : "1 task"), "", "info");
    active.forEach(function (n) { n.st = "running"; logLine(simT, "·", n.name, "RUNNING", "run"); });
    paint();
    var order = active.slice().sort(function (a, b) { return a.dur - b.dur; });
    var elapsed = 0;
    for (var j = 0; j < order.length; j++) {
      var t = pb(order[j].dur);
      await sleep(t - elapsed);
      if (tok !== runToken) return;
      elapsed = t;
      var nn = order[j];
      if (nn.fail) { nn.st = "failed"; nFail++; if (!runState.fail) runState.fail = w + 1;
        logLine(simT + nn.dur, "✗", nn.name, "FAILED after " + nn.dur.toFixed(2) + "s", "fail"); }
      else { nn.st = "ok"; nOk++; logLine(simT + nn.dur, "✓", nn.name, "OK " + nn.dur.toFixed(2) + "s", "ok"); }
      paint();
    }
    simT += Math.max.apply(null, active.map(function (n) { return n.dur; }));
  }
  if (tok !== runToken) return;
  running = false; setRunBtn(false);
  var clean = nFail === 0 && nSkip === 0;
  runOk = clean;
  var counts = nOk + " ok" + (nFail ? " · " + nFail + " failed" : "") +
               (nSkip ? " · " + nSkip + " skipped" : "") + " · " + simT.toFixed(2) + "s wall clock";
  var summary = clean
    ? "pipeline complete · " + nOk + "/" + nodes.length + " ok · " + simT.toFixed(2) + "s"
    : "pipeline finished with failures · " + nOk + " ok · " + nFail + " failed · " + nSkip + " skipped · " + simT.toFixed(2) + "s";
  logLine(simT, clean ? "✓" : "✗", summary, "", clean ? "ok" : "fail");
  $("logmeta").textContent = simT.toFixed(2) + "s simulated";
  pill(clean ? "OK" : "FAILED");
  banner(clean ? "ok" : "err", clean ? "Pipeline complete." : "Pipeline finished with failures.", counts);
  stats(); panel();
}

/* ── panel ──────────────────────────────────────────────────────────────── */
function panel() {
  var body = $("pbody"), title = $("ptitle");
  body.textContent = "";
  var n = sel ? byId(sel) : null;
  if (!n) {
    title.textContent = selEdge ? "Dependency" : "How it works";
    var ul = document.createElement("ul"); ul.className = "hint";
    [["Drag a task", " to move it. Drag the ", "＋", " on its edge onto another task to add a dependency."],
     ["Press Run", " and the scheduler executes in waves — everything in a wave runs at once."],
     ["Select a task", " to rename it, change how long it takes, or make it fail on purpose."],
     ["Try a loop", " — wire the last task back to the first. The graph will refuse it and show you the cycle."]]
      .forEach(function (parts) {
        var li = document.createElement("li");
        var b = document.createElement("b"); b.textContent = parts[0]; li.appendChild(b);
        for (var i = 1; i < parts.length; i++) {
          if (parts[i] === "＋") { var c = document.createElement("b"); c.textContent = "＋"; li.appendChild(c); }
          else li.appendChild(document.createTextNode(parts[i]));
        }
        ul.appendChild(li);
      });
    if (selEdge) {
      var parts = selEdge.split(">"), a = byId(parts[0]), b2 = byId(parts[1]);
      if (a && b2) {
        var d = document.createElement("div"); d.className = "mono";
        d.style.lineHeight = "1.7";
        d.innerHTML = "";
        var s1 = document.createElement("b"); s1.textContent = b2.name;
        var s2 = document.createElement("b"); s2.textContent = a.name;
        d.appendChild(s1); d.appendChild(document.createTextNode("  waits for  ")); d.appendChild(s2);
        var rm = document.createElement("button"); rm.className = "btn sm"; rm.type = "button";
        rm.textContent = "Remove dependency"; rm.style.marginTop = "10px";
        rm.addEventListener("click", function () { removeEdge(parts[0], parts[1]); });
        body.appendChild(d); body.appendChild(rm);
        return;
      }
    }
    body.appendChild(ul);
    return;
  }
  title.textContent = "Task";

  var f1 = document.createElement("div"); f1.className = "field";
  var l1 = document.createElement("label"); l1.textContent = "name"; l1.htmlFor = "fname";
  var i1 = document.createElement("input"); i1.type = "text"; i1.id = "fname"; i1.value = n.name; i1.maxLength = 32;
  i1.addEventListener("change", function () {
    var v = cleanName(i1.value);
    if (!v) { i1.value = n.name; return; }
    if (nodes.some(function (o) { return o !== n && o.name === v; })) {
      banner("err", "A task called " + v + " already exists.", "task names must be unique");
      i1.value = n.name; return;
    }
    n.name = v; i1.value = v; invalidateRun(); paint(); stats();
  });
  f1.appendChild(l1); f1.appendChild(i1);

  var f2 = document.createElement("div"); f2.className = "field";
  var r2 = document.createElement("div"); r2.className = "row";
  var l2 = document.createElement("label"); l2.textContent = "duration"; l2.htmlFor = "fdur";
  var v2 = document.createElement("span"); v2.className = "mono"; v2.innerHTML = "";
  var vb = document.createElement("b"); vb.textContent = n.dur.toFixed(2) + "s"; v2.appendChild(vb);
  r2.appendChild(l2); r2.appendChild(v2);
  var i2 = document.createElement("input"); i2.type = "range"; i2.id = "fdur";
  i2.min = "0.1"; i2.max = "5"; i2.step = "0.1"; i2.value = String(n.dur);
  i2.addEventListener("input", function () {
    n.dur = parseFloat(i2.value); vb.textContent = n.dur.toFixed(2) + "s"; invalidateRun(); paint(); stats();
  });
  f2.appendChild(r2); f2.appendChild(i2);

  var lab = document.createElement("label"); lab.className = "chk";
  var cb = document.createElement("input"); cb.type = "checkbox"; cb.checked = !!n.fail;
  cb.addEventListener("change", function () { n.fail = cb.checked; invalidateRun(); paint(); });
  lab.appendChild(cb); lab.appendChild(document.createTextNode("make this task fail when it runs"));

  var f3 = document.createElement("div"); f3.className = "field";
  var l3 = document.createElement("label");
  var ds = depsOf(n.id);
  l3.textContent = "waits for (" + ds.length + ")";
  f3.appendChild(l3);
  if (!ds.length) {
    var e0 = document.createElement("div"); e0.className = "mono"; e0.textContent = "nothing — starts in wave 1";
    f3.appendChild(e0);
  } else {
    var ul2 = document.createElement("ul"); ul2.className = "deps";
    ds.forEach(function (d) {
      var li = document.createElement("li");
      var s = document.createElement("span"); s.textContent = d.name;
      var x = document.createElement("button"); x.className = "x"; x.type = "button";
      x.textContent = "✕"; x.setAttribute("aria-label", "Remove dependency on " + d.name);
      x.addEventListener("click", function () { removeEdge(d.id, n.id); });
      li.appendChild(s); li.appendChild(x); ul2.appendChild(li);
    });
    f3.appendChild(ul2);
  }

  var meta = document.createElement("div"); meta.className = "mono";
  var rk = ranks();
  meta.textContent = "wave " + (rk ? rk[n.id] + 1 : "—") + "  ·  feeds " + outOf(n.id).length + " task" + (outOf(n.id).length === 1 ? "" : "s");

  var del = document.createElement("button"); del.className = "btn sm"; del.type = "button";
  del.textContent = "Delete task";
  del.addEventListener("click", function () { removeTask(n.id); });

  [f1, f2, lab, f3, meta, del].forEach(function (el) { body.appendChild(el); });
}

/* ── interaction: nodes ─────────────────────────────────────────────────── */
function wireNode(g, id, porthit) {
  var drag = null;
  g.addEventListener("pointerdown", function (e) {
    if (e.button !== undefined && e.button !== 0) return;
    e.stopPropagation();
    if (connect) return;
    sel = id; selEdge = null; paint(); stats(); panel();
    var n = byId(id); if (!n) return;
    var p = toWorld(e.clientX, e.clientY);
    drag = { dx: p.x - n.x, dy: p.y - n.y, moved: false };
    try { g.setPointerCapture(e.pointerId); } catch (err) {}
    g.classList.add("dragging");
  });
  g.addEventListener("pointermove", function (e) {
    if (!drag) return;
    var n = byId(id); if (!n) return;
    var p = toWorld(e.clientX, e.clientY);
    n.x = p.x - drag.dx; n.y = p.y - drag.dy; drag.moved = true; touched = true;
    geom();
  });
  var end = function (e) {
    if (!drag) return;
    drag = null; g.classList.remove("dragging");
    try { g.releasePointerCapture(e.pointerId); } catch (err) {}
  };
  g.addEventListener("pointerup", end);
  g.addEventListener("pointercancel", end);
  g.addEventListener("focus", function () { sel = id; selEdge = null; paint(); stats(); panel(); });

  porthit.addEventListener("pointerdown", function (e) {
    e.stopPropagation(); e.preventDefault();
    var n = byId(id); if (!n) return;
    var pp = portPos(n);
    connect = { from: id, gx: pp.x, gy: pp.y, pointer: e.pointerId };
    try { board.setPointerCapture(e.pointerId); } catch (err) {}
    drawGhost(pp.x, pp.y);
  });
}
function drawGhost(x, y, target) {
  glayer.textContent = "";
  if (!connect) return;
  var a = byId(connect.from); if (!a) return;
  var p = anchor(a, { x: x - W/2, y: y - H/2 });
  var path = mk("path", { "class": "ghost", d: curve(p, { x: x, y: y }) });
  glayer.appendChild(path);
  nodes.forEach(function (n) {
    var r = nodeEls.get(n.id); if (!r) return;
    r.g.classList.toggle("sel", !!target && target.id === n.id);
  });
}

/* board-level pointer handling: pan + connect */
var pan = null;
board.addEventListener("pointerdown", function (e) {
  if (connect) return;
  if (e.button !== undefined && e.button !== 0) return;
  pan = { sx: e.clientX, sy: e.clientY, vx: view.x, vy: view.y, moved: false };
  try { board.setPointerCapture(e.pointerId); } catch (err) {}
  board.classList.add("panning");
});
board.addEventListener("pointermove", function (e) {
  if (connect) {
    var p = toWorld(e.clientX, e.clientY);
    drawGhost(p.x, p.y, nodeAt(p));
    return;
  }
  if (!pan) return;
  touched = true;
  view.x = pan.vx + (e.clientX - pan.sx);
  view.y = pan.vy + (e.clientY - pan.sy);
  if (Math.abs(e.clientX - pan.sx) + Math.abs(e.clientY - pan.sy) > 3) pan.moved = true;
  applyView();
});
function boardUp(e) {
  if (connect) {
    var p = toWorld(e.clientX, e.clientY);
    var tgt = nodeAt(p);
    var from = connect.from;
    connect = null; glayer.textContent = "";
    try { board.releasePointerCapture(e.pointerId); } catch (err) {}
    paint();
    if (tgt) addEdge(from, tgt.id);
    else banner("info", "Drop the arrow on a task to create a dependency.", "");
    return;
  }
  if (pan) {
    if (!pan.moved) { sel = null; selEdge = null; paint(); stats(); panel(); }
    pan = null; board.classList.remove("panning");
    try { board.releasePointerCapture(e.pointerId); } catch (err) {}
  }
}
board.addEventListener("pointerup", boardUp);
board.addEventListener("pointercancel", function (e) {
  connect = null; glayer.textContent = ""; pan = null;
  board.classList.remove("panning"); paint();
});
board.addEventListener("wheel", function (e) {
  if (!e.ctrlKey && !e.metaKey) return;
  e.preventDefault();
  var rc = board.getBoundingClientRect(), cx = e.clientX - rc.left, cy = e.clientY - rc.top;
  var nk = Math.max(0.28, Math.min(2.2, view.k * (e.deltaY < 0 ? 1.12 : 1 / 1.12)));
  view.x = cx - (cx - view.x) * (nk / view.k);
  view.y = cy - (cy - view.y) * (nk / view.k);
  view.k = nk; touched = true; applyView();
}, { passive: false });

/* ── keyboard ───────────────────────────────────────────────────────────── */
var kbConnect = null;
document.addEventListener("keydown", function (e) {
  /* never hijack keys aimed at a real control — buttons, inputs, sliders */
  var ctl = e.target && e.target.closest && e.target.closest("button, input, select, textarea, a[href]");
  if (ctl) {
    if (e.key === "Escape" && ctl.blur) ctl.blur();
    return;
  }
  var onNode = e.target && e.target.classList && e.target.classList.contains("node");
  var id = onNode ? e.target.dataset.id : sel;
  var n = id ? byId(id) : null;

  if (e.key === "Escape") {
    if (kbConnect) { kbConnect = null; banner("info", "Connection cancelled.", ""); }
    else { sel = null; selEdge = null; }
    connect = null; glayer.textContent = "";
    paint(); stats(); panel(); return;
  }
  if ((e.key === "Delete" || e.key === "Backspace")) {
    if (selEdge) { e.preventDefault(); var pp = selEdge.split(">"); removeEdge(pp[0], pp[1]); return; }
    if (n) { e.preventDefault(); removeTask(n.id); return; }
  }
  if (!n) return;
  if (e.key === "c" || e.key === "C") {
    e.preventDefault();
    kbConnect = n.id;
    banner("info", "Connect mode — Tab to another task and press Enter.", "from  " + n.name);
    return;
  }
  if (e.key === "Enter" || e.key === " ") {
    e.preventDefault();
    if (kbConnect && kbConnect !== n.id) {
      var f = kbConnect; kbConnect = null;
      if (addEdge(f, n.id)) { /* banner set by addEdge */ }
      var el = nodeEls.get(n.id); if (el) el.g.focus();
    } else { sel = n.id; selEdge = null; paint(); stats(); panel(); }
    return;
  }
  var step = e.shiftKey ? 40 : 10, moved = false;
  if (e.key === "ArrowLeft")  { n.x -= step; moved = true; }
  if (e.key === "ArrowRight") { n.x += step; moved = true; }
  if (e.key === "ArrowUp")    { n.y -= step; moved = true; }
  if (e.key === "ArrowDown")  { n.y += step; moved = true; }
  if (moved) { e.preventDefault(); touched = true; geom(); }
});

/* ── controls ───────────────────────────────────────────────────────────── */
$("run").addEventListener("click", function () {
  if (running) { cancelRun(); return; }
  runPipeline();
});
$("reset").addEventListener("click", function () {
  cancelRun(true);
  runToken++;
  nodes.forEach(function (n) { n.st = "idle"; });
  runState = { wave: 0, total: 0 }; runOk = null;
  pill("IDLE"); setRunBtn(false); clearLog(); paint(); stats(); panel();
  banner("info", "Run state cleared.", "graph kept · " + plural(nodes.length, "task"));
});
$("tidy").addEventListener("click", function () { autoLayout(); geom(); fit(); banner("info", "Layout tidied by wave.", ""); });
$("seed").addEventListener("click", function () { loadSeed(); banner("info", "Example ETL pipeline reloaded.", "7 tasks · 7 dependencies"); });
$("addf").addEventListener("submit", function (e) {
  e.preventDefault();
  addTask($("newname").value);
  $("newname").value = "";
});
$("zin").addEventListener("click", function () { zoomBy(1.18); });
$("zout").addEventListener("click", function () { zoomBy(1 / 1.18); });
$("zfit").addEventListener("click", fit);
$("critbtn").addEventListener("click", function () {
  showCrit = !showCrit;
  this.setAttribute("aria-pressed", showCrit ? "true" : "false");
  paint();
  if (showCrit) {
    var cp = criticalPath();
    if (!cp.ids.length) banner("info", "Nothing to highlight.", "the graph is empty");
    else banner("info", "Critical path — the chain that sets the wall clock.",
      cp.ids.map(function (i) { return byId(i).name; }).join("  →  ") + "   =   " + cp.total.toFixed(2) + "s");
  } else banner(null);
});

/* ── responsive ─────────────────────────────────────────────────────────── */
/* pick the orientation that lets the whole graph render biggest in this canvas */
function wantOrient() {
  var rc = board.getBoundingClientRect();
  if (!rc.width) return orient;
  var a = layoutSize("LR"), b = layoutSize("TB");
  if (!a || !b) return rc.width >= 600 ? "LR" : "TB";
  var scale = function (s) { return Math.min((rc.width - 44) / s.w, (rc.height - 66) / s.h, 1.12); };
  /* dependency graphs read left-to-right, so LR wins ties and near-ties */
  return scale(a) * 1.18 >= scale(b) ? "LR" : "TB";
}
var ro = new ResizeObserver(function () {
  var w = wantOrient();
  if (w !== orient) { orient = w; autoLayout(); geom(); touched = false; fit(); }
  else if (!touched) fit();
});

/* ── boot ───────────────────────────────────────────────────────────────── */
orient = "LR";
loadSeed();
requestAnimationFrame(function () {
  orient = wantOrient();
  autoLayout(); syncAll(); fit();
  ro.observe(board);
});
})();
</script>
</body>
</html>