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scrubdata
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>ScrubData // console</title>
<style>
  /* ============ DESIGN TOKENS ============ */
  :root {
    --bg:        #0a0d12;
    --bg-1:      #0f141b;
    --bg-2:      #141b24;
    --bg-3:      #1a232e;
    --line:      #233040;
    --line-soft: #1a2330;
    --fg:        #d7e0ea;
    --fg-dim:    #8593a3;
    --fg-faint:  #5a6878;
    --accent:    #36e0b0;
    --accent-d:  #0f3b30;
    --warn:      #f0a330;
    --del:       #ff5c6c;
    --del-bg:    #2a1318;
    --add:       #36e0b0;
    --add-bg:    #0f2a22;
    --chg:       #f0c330;
    --chg-bg:    #2a2410;
    --mono: "SFMono-Regular", "JetBrains Mono", "Fira Code", Menlo, Consolas, monospace;
    --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  }
  * { box-sizing: border-box; }
  html, body { margin:0; padding:0; height:100%; }
  body {
    background: var(--bg);
    color: var(--fg);
    font-family: var(--sans);
    font-size: 13px;
    line-height: 1.45;
    -webkit-font-smoothing: antialiased;
    background-image:
      radial-gradient(900px 500px at 85% -10%, rgba(54,224,176,.06), transparent 60%),
      linear-gradient(transparent 0, transparent 31px, var(--line-soft) 31px, var(--line-soft) 32px);
    background-size: auto, 100% 32px;
  }
  ::selection { background: var(--accent); color:#04130d; }

  /* ============ SCROLLBARS ============ */
  ::-webkit-scrollbar { width:10px; height:10px; }
  ::-webkit-scrollbar-track { background: var(--bg-1); }
  ::-webkit-scrollbar-thumb { background: var(--line); border:2px solid var(--bg-1); border-radius:6px; }
  ::-webkit-scrollbar-thumb:hover { background:#2e3e52; }

  /* ============ TOP BAR ============ */
  header {
    position: sticky; top:0; z-index:50;
    display:flex; align-items:center; gap:16px;
    padding:0 18px; height:48px;
    background: rgba(10,13,18,.86);
    backdrop-filter: blur(8px);
    border-bottom:1px solid var(--line);
  }
  .brand { display:flex; align-items:center; gap:9px; font-family:var(--mono); font-weight:600; letter-spacing:.5px; }
  .logo {
    width:22px; height:22px; border-radius:5px;
    background: linear-gradient(140deg, var(--accent), #1f8f72);
    display:grid; place-items:center; color:#04130d; font-weight:800; font-size:13px;
    box-shadow: 0 0 0 1px rgba(54,224,176,.4), 0 0 18px rgba(54,224,176,.25);
  }
  .brand small { color:var(--fg-faint); font-weight:400; letter-spacing:2px; font-size:10px; }
  .topspace { flex:1; }
  .kbd-hint { font-family:var(--mono); font-size:11px; color:var(--fg-faint); }
  .kbd-hint kbd {
    font-family:var(--mono); background:var(--bg-3); border:1px solid var(--line);
    border-bottom-width:2px; border-radius:4px; padding:1px 6px; color:var(--fg-dim); font-size:10px;
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  .status-led {
    display:flex; align-items:center; gap:7px; font-family:var(--mono);
    font-size:11px; color:var(--fg-dim); padding:4px 10px;
    border:1px solid var(--line); border-radius:6px; background:var(--bg-1);
  }
  .led { width:7px; height:7px; border-radius:50%; background:var(--fg-faint); }
  .status-led.idle  .led { background:var(--fg-faint); }
  .status-led.busy  .led { background:var(--warn); box-shadow:0 0 8px var(--warn); animation:pulse 1s infinite; }
  .status-led.ok    .led { background:var(--accent); box-shadow:0 0 8px var(--accent); }
  .status-led.err   .led { background:var(--del); box-shadow:0 0 8px var(--del); }
  @keyframes pulse { 0%,100%{opacity:1} 50%{opacity:.35} }

  /* ============ LAYOUT ============ */
  main { max-width: 1500px; margin:0 auto; padding:22px 18px 96px; }

  /* ============ COMMAND BAR ============ */
  .cmd {
    display:flex; align-items:stretch; gap:0;
    border:1px solid var(--line); border-radius:10px; overflow:hidden;
    background: linear-gradient(180deg, var(--bg-2), var(--bg-1));
    box-shadow: 0 8px 30px rgba(0,0,0,.4);
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  .drop {
    flex:1; display:flex; align-items:center; gap:14px;
    padding:16px 18px; cursor:pointer; position:relative;
    transition: background .12s;
  }
  .drop:hover { background: rgba(54,224,176,.04); }
  .drop:focus-within { background: rgba(54,224,176,.06); }
  .drop:focus-within::after {
    content:""; position:absolute; inset:4px; border:1.5px solid var(--accent); border-radius:8px; pointer-events:none;
  }
  .drop.drag { background: rgba(54,224,176,.09); }
  .drop.drag::after {
    content:""; position:absolute; inset:6px; border:1.5px dashed var(--accent); border-radius:7px;
  }
  .drop-icon {
    width:42px; height:42px; flex:none; border-radius:9px;
    border:1px solid var(--line); background:var(--bg);
    display:grid; place-items:center; color:var(--accent);
  }
  .drop-icon svg { width:20px; height:20px; }
  .drop-txt b { display:block; font-size:13.5px; }
  .drop-txt span { color:var(--fg-dim); font-size:12px; font-family:var(--mono); }
  .file-tag {
    color:var(--accent); font-family:var(--mono); font-weight:600;
  }
  .cmd-actions { display:flex; align-items:center; gap:0; border-left:1px solid var(--line); }
  .btn {
    font-family:var(--mono); font-size:12.5px; font-weight:600; letter-spacing:.3px;
    border:none; cursor:pointer; padding:0 22px; height:100%;
    background:transparent; color:var(--fg-dim); transition:all .12s;
    display:flex; align-items:center; gap:8px;
  }
  .btn:hover { color:var(--fg); background:var(--bg-3); }
  .btn-primary {
    background: linear-gradient(180deg, #3df0bd, #25c79b);
    color:#04130d; padding:0 26px;
    box-shadow: inset 0 1px 0 rgba(255,255,255,.25);
  }
  .btn-primary:hover { background:linear-gradient(180deg, #4dffcb, #2cd6a8); color:#04130d; }
  .btn-primary:disabled { opacity:.4; cursor:not-allowed; filter:grayscale(.5); }
  .btn .spin {
    width:13px; height:13px; border:2px solid rgba(4,19,13,.3); border-top-color:#04130d;
    border-radius:50%; animation:rot .6s linear infinite;
  }
  @keyframes rot { to { transform:rotate(360deg) } }

  .subbar {
    display:flex; align-items:center; gap:14px; margin-top:10px; flex-wrap:wrap;
    font-family:var(--mono); font-size:11.5px; color:var(--fg-faint);
  }
  .subbar a {
    color:var(--accent); text-decoration:none; border-bottom:1px dashed rgba(54,224,176,.4);
    cursor:pointer; background:none; border-top:none; border-left:none; border-right:none;
    font-family:var(--mono); font-size:11.5px; padding:2px 0;
  }
  .subbar a:hover, .subbar a:focus-visible { border-bottom-style:solid; outline:none; }
  .subbar .sep { color:var(--line); }

  /* ============ ERROR ============ */
  .err-box {
    display:none; margin-top:14px; padding:12px 16px;
    border:1px solid #5a2230; border-left:3px solid var(--del); border-radius:8px;
    background: var(--del-bg); color:#ffb6bf; font-family:var(--mono); font-size:12px;
  }
  .err-box.show { display:block; }
  .err-box b { color:var(--del); }

  /* ============ RESULT GRID ============ */
  .results { display:none; margin-top:24px; }
  .results.show { display:block; animation:fade .25s ease; }
  @keyframes fade { from{opacity:0; transform:translateY(6px)} to{opacity:1; transform:none} }

  /* metric strip */
  .metrics { display:grid; grid-template-columns: repeat(auto-fit, minmax(150px,1fr)); gap:10px; margin-bottom:18px; }
  .metric {
    border:1px solid var(--line); border-radius:9px; padding:12px 14px;
    background: linear-gradient(180deg, var(--bg-2), var(--bg-1));
  }
  .metric .k { font-family:var(--mono); font-size:10.5px; letter-spacing:1px; text-transform:uppercase; color:var(--fg-faint); }
  .metric .v { font-family:var(--mono); font-size:22px; font-weight:700; margin-top:4px; color:var(--fg); }
  .metric .v.accent { color:var(--accent); }
  .metric .v.chg { color:var(--chg); }
  .metric .v.del { color:var(--del); }
  .metric .sub { font-size:11px; color:var(--fg-dim); font-family:var(--mono); margin-top:2px; }

  .summary-line {
    margin-bottom:18px; padding:12px 16px; border-radius:9px;
    background:var(--accent-d); border:1px solid #1c5a48; color:#a8f0d8;
    font-size:13px; display:flex; gap:10px; align-items:flex-start;
  }
  .summary-line svg { width:16px; height:16px; flex:none; margin-top:1px; color:var(--accent); }

  /* panel + tabs */
  .panel { border:1px solid var(--line); border-radius:11px; background:var(--bg-1); overflow:hidden; margin-bottom:18px; }
  .panel-head {
    display:flex; align-items:center; gap:2px; padding:0 6px; min-height:42px; flex-wrap:wrap;
    border-bottom:1px solid var(--line); background:var(--bg-2);
  }
  .panel-title { font-family:var(--mono); font-size:11px; letter-spacing:1.5px; text-transform:uppercase; color:var(--fg-faint); padding:0 12px; }
  .tabs { display:flex; gap:2px; margin-left:auto; }
  .tab {
    font-family:var(--mono); font-size:11.5px; font-weight:600; letter-spacing:.3px;
    background:transparent; border:none; color:var(--fg-dim); cursor:pointer;
    padding:7px 14px; border-radius:7px; transition:all .12s;
  }
  .tab:hover { color:var(--fg); background:var(--bg-3); }
  .tab.active { color:#04130d; background:var(--accent); }
  .tab:focus-visible { outline:2px solid var(--accent); outline-offset:1px; }
  .legend { display:flex; gap:14px; align-items:center; padding:0 14px; font-family:var(--mono); font-size:10.5px; color:var(--fg-faint); }
  .legend .swatch { display:inline-flex; align-items:center; gap:5px; }
  .legend i { width:9px; height:9px; border-radius:2px; display:inline-block; }
  .legend .add  i { background:var(--add); }
  .legend .chg  i { background:var(--chg); }
  .legend .del  i { background:var(--del); }

  .cap-note {
    padding:7px 14px; font-family:var(--mono); font-size:11px; color:var(--fg-faint);
    border-bottom:1px solid var(--line-soft); background:var(--bg-1);
  }
  .cap-note b { color:var(--fg-dim); }

  .table-wrap { overflow:auto; max-height: 520px; }
  table.grid { border-collapse:separate; border-spacing:0; width:100%; font-family:var(--mono); font-size:12px; }
  table.grid th, table.grid td {
    padding:6px 11px; border-bottom:1px solid var(--line-soft); border-right:1px solid var(--line-soft);
    white-space:nowrap; max-width:340px; overflow:hidden; text-overflow:ellipsis;
  }
  table.grid thead th {
    position:sticky; top:0; z-index:5; background:var(--bg-3); color:var(--fg-dim);
    text-align:left; font-weight:600; font-size:11px; letter-spacing:.4px;
    border-bottom:1px solid var(--line);
  }
  table.grid thead th:first-child, table.grid tbody td.rownum {
    position:sticky; left:0; z-index:6; background:var(--bg-2);
    color:var(--fg-faint); text-align:right; user-select:none; font-size:11px;
  }
  table.grid thead th:first-child { z-index:7; }
  table.grid tbody tr:hover td { background:rgba(54,224,176,.045); }
  table.grid tbody tr:hover td.rownum { background:var(--bg-3); }
  td.cell-empty { color:var(--fg-faint); font-style:italic; }

  /* diff cell states */
  td.d-add { background:var(--add-bg); color:#7ff0cf; box-shadow: inset 2px 0 0 var(--add); }
  td.d-chg { background:var(--chg-bg); color:#f0d88c; box-shadow: inset 2px 0 0 var(--chg); }
  td.d-del { background:var(--del-bg); color:#ff9aa4; box-shadow: inset 2px 0 0 var(--del); }
  td.d-chg .old { color:var(--del); text-decoration:line-through; opacity:.6; margin-right:6px; }
  td.d-chg .arrow { color:var(--fg-faint); margin:0 4px; }
  tr.row-removed td { opacity:.5; background:var(--del-bg); }
  tr.row-removed td.rownum { color:var(--del); opacity:1; }
  tr.row-added td { background:var(--add-bg); }
  tr.row-added td.rownum { color:var(--add); }

  .empty-note { padding:40px; text-align:center; color:var(--fg-faint); font-family:var(--mono); font-size:12px; }

  /* report */
  .report-body { padding:18px 22px; font-size:13px; }
  .report-body h1, .report-body h2, .report-body h3 { font-family:var(--mono); letter-spacing:.3px; }
  .report-body h1 { font-size:17px; border-bottom:1px solid var(--line); padding-bottom:8px; color:var(--fg); }
  .report-body h2 { font-size:14px; color:var(--accent); margin-top:20px; }
  .report-body h3 { font-size:12.5px; color:var(--fg-dim); margin-top:14px; }
  .report-body p { color:var(--fg-dim); }
  .report-body em { color:var(--fg-faint); font-style:italic; }
  .report-body code { font-family:var(--mono); background:var(--bg-3); padding:1px 6px; border-radius:4px; color:var(--accent); font-size:12px; }
  .report-body ul { padding-left:20px; }
  .report-body li { margin:3px 0; color:var(--fg-dim); }
  .report-body li::marker { color:var(--accent); }
  .report-body strong { color:var(--fg); }
  .report-body table { border-collapse:collapse; font-family:var(--mono); font-size:12px; margin:10px 0; }
  .report-body table td, .report-body table th { border:1px solid var(--line); padding:5px 10px; }
  .report-body table th { background:var(--bg-3); color:var(--fg-dim); }
  .report-body hr { border:none; border-top:1px solid var(--line); margin:18px 0; }

  /* download dock */
  .dock {
    position:fixed; bottom:0; left:0; right:0; z-index:40;
    display:none; align-items:center; gap:14px; padding:11px 22px;
    background:rgba(15,20,27,.94); backdrop-filter:blur(8px); border-top:1px solid var(--line);
  }
  .dock.show { display:flex; }
  .dock .info { font-family:var(--mono); font-size:11.5px; color:var(--fg-dim); }
  .dock .info b { color:var(--accent); }
  .dock-space { flex:1; }
  .btn-download {
    font-family:var(--mono); font-size:12.5px; font-weight:700; letter-spacing:.3px;
    border:1px solid #1c5a48; border-radius:8px; cursor:pointer;
    background:linear-gradient(180deg,#3df0bd,#25c79b); color:#04130d;
    padding:10px 20px; display:flex; align-items:center; gap:9px;
    box-shadow: 0 0 24px rgba(54,224,176,.3);
  }
  .btn-download:hover { filter:brightness(1.08); }
  .btn-download:focus-visible { outline:2px solid #fff; outline-offset:2px; }
  .btn-download svg { width:15px; height:15px; }

  .ghost {
    position:absolute; width:1px; height:1px; padding:0; margin:-1px;
    overflow:hidden; clip:rect(0 0 0 0); white-space:nowrap; border:0;
  }
  .visually-hidden {
    position:absolute; width:1px; height:1px; overflow:hidden;
    clip:rect(0 0 0 0); white-space:nowrap; border:0; margin:-1px; padding:0;
  }

  /* ============ RESPONSIVE ============ */
  @media (max-width: 720px) {
    main { padding:16px 12px 120px; }
    .cmd { flex-direction:column; }
    .cmd-actions { border-left:none; border-top:1px solid var(--line); }
    .btn-primary { width:100%; justify-content:center; padding:14px 0; }
    .kbd-hint { display:none; }
    header { gap:10px; padding:0 12px; }
    .metrics { grid-template-columns: repeat(2, 1fr); }
    .panel-head { padding:6px; }
    .tabs { margin-left:0; width:100%; justify-content:flex-end; }
    .table-wrap { max-height: 60vh; }
    .dock { flex-direction:column; align-items:stretch; gap:8px; padding:10px 12px; }
    .dock-space { display:none; }
    .btn-download { width:100%; justify-content:center; }
  }
</style>
</head>
<body>
<header>
  <div class="brand">
    <div class="logo">S</div>
    ScrubData <small>// CONSOLE</small>
  </div>
  <div class="topspace"></div>
  <div class="kbd-hint">press <kbd>⌘</kbd> <kbd>↵</kbd> to clean &nbsp; · &nbsp; <kbd>O</kbd> to open file</div>
  <div class="status-led idle" id="statusLed" role="status" aria-live="polite">
    <span class="led" aria-hidden="true"></span><span id="statusTxt">idle</span>
  </div>
</header>

<main>
  <!-- COMMAND BAR -->
  <div class="cmd">
    <label class="drop" id="dropZone" for="fileInput">
      <input type="file" id="fileInput" class="ghost" accept=".csv,.xlsx,.xls"
             aria-label="Choose a CSV or Excel file to clean" />
      <div class="drop-icon" aria-hidden="true">
        <svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.8">
          <path d="M12 16V4M12 4l-4 4M12 4l4 4" stroke-linecap="round" stroke-linejoin="round"/>
          <path d="M4 16v2a2 2 0 002 2h12a2 2 0 002-2v-2" stroke-linecap="round"/>
        </svg>
      </div>
      <div class="drop-txt">
        <b id="dropTitle">Drop a CSV / Excel file</b>
        <span id="dropSub">or click to browse · .csv .xlsx .xls</span>
      </div>
    </label>
    <div class="cmd-actions">
      <button class="btn btn-primary" id="runBtn" disabled>
        <span id="runLabel">▶ CLEAN IT</span>
      </button>
    </div>
  </div>

  <div class="subbar">
    <span>No file? Try the deliberately messy sample:</span>
    <a id="sampleBtn" role="button" tabindex="0">load samples/dirty_contacts.csv →</a>
    <span class="sep">|</span>
    <span>raw strings in · trustworthy table out · nothing silent</span>
  </div>

  <div class="err-box" id="errBox" role="alert" aria-live="assertive"><b>ERR</b> <span id="errMsg"></span></div>

  <!-- RESULTS -->
  <div class="results" id="results">

    <div class="metrics" id="metrics"></div>

    <div class="summary-line" id="summaryLine">
      <svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" aria-hidden="true">
        <path d="M9 12l2 2 4-4" stroke-linecap="round" stroke-linejoin="round"/>
        <circle cx="12" cy="12" r="9"/>
      </svg>
      <span id="summaryTxt"></span>
    </div>

    <!-- DATA PANEL -->
    <div class="panel">
      <div class="panel-head">
        <span class="panel-title">data</span>
        <div class="legend" id="legend" style="display:none">
          <span class="swatch chg"><i></i>changed</span>
          <span class="swatch add"><i></i>added</span>
          <span class="swatch del"><i></i>removed</span>
        </div>
        <div class="tabs" role="tablist" aria-label="Data view">
          <button class="tab active" data-view="diff"   role="tab" aria-selected="true">DIFF</button>
          <button class="tab"        data-view="before" role="tab" aria-selected="false">BEFORE</button>
          <button class="tab"        data-view="after"  role="tab" aria-selected="false">AFTER</button>
        </div>
      </div>
      <div class="cap-note" id="capNote" style="display:none"></div>
      <div class="table-wrap" id="tableWrap"></div>
    </div>

    <!-- REPORT PANEL -->
    <div class="panel">
      <div class="panel-head">
        <span class="panel-title">change report</span>
      </div>
      <div class="report-body" id="reportBody"></div>
    </div>

  </div>
</main>

<!-- DOWNLOAD DOCK -->
<div class="dock" id="dock">
  <div class="info">output ready · <b id="dockName">scrubbed.csv</b> · <span id="dockSize"></span></div>
  <div class="dock-space"></div>
  <button class="btn-download" id="downloadBtn">
    <svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2.2" aria-hidden="true">
      <path d="M12 4v11M12 15l-4-4M12 15l4-4" stroke-linecap="round" stroke-linejoin="round"/>
      <path d="M5 19h14" stroke-linecap="round"/>
    </svg>
    DOWNLOAD scrubbed.csv
  </button>
</div>

<script type="module">
  import { Client, handle_file } from "https://cdn.jsdelivr.net/npm/@gradio/client";

  /* ---------- element refs ---------- */
  const $ = (id) => document.getElementById(id);
  const fileInput = $("fileInput");
  const dropZone  = $("dropZone");
  const runBtn    = $("runBtn");
  const runLabel  = $("runLabel");
  const sampleBtn = $("sampleBtn");
  const errBox    = $("errBox");
  const errMsg    = $("errMsg");
  const results   = $("results");
  const tableWrap = $("tableWrap");
  const reportBody= $("reportBody");
  const dock      = $("dock");
  const dockSize  = $("dockSize");
  const downloadBtn = $("downloadBtn");
  const statusLed = $("statusLed");
  const statusTxt = $("statusTxt");
  const legend    = $("legend");
  const capNote   = $("capNote");

  /* ---------- client-side render cap (defensive: backend caps at preview_cap) */
  const RENDER_CAP = 200;

  /* ---------- state ---------- */
  let selectedFile = null;   // File object (from input/drop) -> uploaded as a real file
  let lastResult   = null;   // backend dict
  let currentView  = "diff";

  // Path served by the server's /samples StaticFiles mount.
  const SAMPLE_PATH = "/samples/dirty_contacts.csv";

  /* ---------- status helper ---------- */
  function setStatus(kind, txt){
    statusLed.className = "status-led " + kind;
    statusTxt.textContent = txt;
  }
  function showError(msg){
    errMsg.textContent = msg;
    errBox.classList.add("show");
    setStatus("err","error");
  }
  function clearError(){ errBox.classList.remove("show"); errMsg.textContent = ""; }

  /* ---------- file selection ---------- */
  function pickFile(file){
    selectedFile = file;
    $("dropTitle").innerHTML = '<span class="file-tag"></span>';
    $("dropTitle").firstChild.textContent = file.name;
    $("dropSub").textContent = (file.size/1024).toFixed(1) + " KB · ready";
    runBtn.disabled = false;
    clearError();
    setStatus("idle","ready");
  }
  // Fetch the bundled sample over HTTP and turn it into a real File, so it's
  // uploaded like any user file. (Passing a URL to handle_file would make the
  // server re-download from its own origin, which its SSRF guard rejects.)
  async function pickSample(){
    clearError();
    setStatus("busy","loading sample…");
    try {
      const resp = await fetch(SAMPLE_PATH, { cache: "no-store" });
      if (!resp.ok) throw new Error("Could not load sample (HTTP " + resp.status + ").");
      const blob = await resp.blob();
      const file = new File([blob], "dirty_contacts.csv", { type: "text/csv" });
      selectedFile = file;
      $("dropTitle").innerHTML = '<span class="file-tag">dirty_contacts.csv</span>';
      $("dropSub").textContent = (file.size/1024).toFixed(1) + " KB · sample · ready";
      runBtn.disabled = false;
      setStatus("idle","ready · sample");
    } catch (err){
      showError((err && err.message) ? err.message : String(err));
    }
  }

  fileInput.addEventListener("change", (e) => {
    if (e.target.files && e.target.files[0]) pickFile(e.target.files[0]);
  });
  sampleBtn.addEventListener("click", (e) => { e.preventDefault(); pickSample(); });
  sampleBtn.addEventListener("keydown", (e) => {
    if (e.key === "Enter" || e.key === " ") { e.preventDefault(); pickSample(); }
  });

  /* drag & drop */
  ["dragenter","dragover"].forEach(ev =>
    dropZone.addEventListener(ev, (e)=>{ e.preventDefault(); dropZone.classList.add("drag"); }));
  ["dragleave","drop"].forEach(ev =>
    dropZone.addEventListener(ev, (e)=>{ e.preventDefault(); dropZone.classList.remove("drag"); }));
  dropZone.addEventListener("drop", (e)=>{
    if (e.dataTransfer.files && e.dataTransfer.files[0]) pickFile(e.dataTransfer.files[0]);
  });

  /* ---------- keyboard ---------- */
  function isTextEntry(el){
    if (!el) return false;
    const tag = el.tagName;
    return tag === "INPUT" || tag === "TEXTAREA" || tag === "SELECT" || el.isContentEditable;
  }
  document.addEventListener("keydown", (e)=>{
    // Cmd/Ctrl+Enter: clean (safe even in text fields)
    if ((e.metaKey || e.ctrlKey) && e.key === "Enter"){
      e.preventDefault(); if(!runBtn.disabled) run(); return;
    }
    // bare shortcuts: never fire while typing in a field
    if (e.metaKey || e.ctrlKey || e.altKey || isTextEntry(document.activeElement)) return;
    if (e.key.toLowerCase() === "o"){ e.preventDefault(); fileInput.click(); }
    else if (results.classList.contains("show")){
      if (e.key === "1") setView("diff");
      else if (e.key === "2") setView("before");
      else if (e.key === "3") setView("after");
    }
  });

  /* ---------- run cleaning ---------- */
  runBtn.addEventListener("click", run);
  async function run(){
    if (!selectedFile) return;
    clearError();
    runBtn.disabled = true;
    runLabel.innerHTML = '<span class="spin"></span> CLEANING';
    setStatus("busy","cleaning…");
    results.classList.remove("show");
    dock.classList.remove("show");

    try {
      const client = await Client.connect(window.location.origin);
      const result = await client.predict("/clean_data", { file_path: handle_file(selectedFile) });
      const data = result.data[0];
      if (!data || typeof data !== "object") throw new Error("Unexpected response shape from /clean_data.");
      lastResult = data;
      render(data);
      setStatus("ok","done");
    } catch (err){
      console.error(err);
      showError((err && err.message) ? err.message : String(err));
    } finally {
      runBtn.disabled = false;
      runLabel.innerHTML = "▶ CLEAN IT";
    }
  }

  /* ---------- schema accessors (match server.py response dict) ---------- */
  function getBefore(d){ return Array.isArray(d.before) ? d.before : []; }
  function getAfter(d){ return Array.isArray(d.after) ? d.after : []; }
  function getColsBefore(d){
    if (Array.isArray(d.columns_before) && d.columns_before.length) return d.columns_before.slice();
    return columnsOf(getBefore(d));
  }
  function getColsAfter(d){
    if (Array.isArray(d.columns_after) && d.columns_after.length) return d.columns_after.slice();
    return columnsOf(getAfter(d));
  }
  function getAlignment(d){ return Array.isArray(d.alignment) ? d.alignment : null; }
  function getChangeLog(d){ return Array.isArray(d.change_log) ? d.change_log : []; }

  /* ---------- render orchestrator ---------- */
  function render(data){
    renderMetrics(data);
    $("summaryTxt").textContent = data.summary || "Cleaning complete.";
    renderReport(data.report_md);
    renderCapNote(data);
    renderTable();
    results.classList.add("show");

    if (typeof data.csv_text === "string" && data.csv_text.length){
      dockSize.textContent = (new Blob([data.csv_text]).size/1024).toFixed(1) + " KB";
      dock.classList.add("show");
    } else {
      dock.classList.remove("show");
    }
  }

  function renderCapNote(data){
    const totalAfter  = num(data.total_rows_after,  getAfter(data).length);
    const shownAfter  = getAfter(data).length;
    if (totalAfter > shownAfter || shownAfter > RENDER_CAP){
      const shown = Math.min(shownAfter, RENDER_CAP);
      capNote.style.display = "block";
      capNote.innerHTML = `Preview · showing first <b>${shown}</b> of <b>${totalAfter.toLocaleString()}</b> output rows. Download for the full dataset.`;
    } else {
      capNote.style.display = "none";
    }
  }

  function renderMetrics(data){
    const colsBefore = getColsBefore(data);
    const colsAfter  = getColsAfter(data);
    // True dataset totals from the backend (fall back to preview length).
    const totalBefore = num(data.total_rows_before, getBefore(data).length);
    const totalAfter  = num(data.total_rows_after,  getAfter(data).length);
    const rowsDropped = Math.max(0, totalBefore - totalAfter);
    const colsDropped = Math.max(0, colsBefore.length - colsAfter.length);
    const changed = diffStats(data).changed;

    const cards = [
      { k:"rows out",      v:totalAfter.toLocaleString(),
        sub: rowsDropped ? ("−"+rowsDropped.toLocaleString()+" from "+totalBefore.toLocaleString()) : "no rows dropped", cls:"accent" },
      { k:"columns",       v:colsAfter.length,
        sub: colsDropped ? ("−"+colsDropped+" dropped") : "all kept", cls:"" },
      { k:"cells changed", v:changed,
        sub:"in preview", cls: changed ? "chg":"" },
      { k:"rows removed",  v:rowsDropped.toLocaleString(),
        sub:"dups / empties", cls: rowsDropped ? "del":"" },
    ];
    $("metrics").innerHTML = cards.map(c =>
      `<div class="metric"><div class="k">${escapeHtml(c.k)}</div>
       <div class="v ${c.cls}">${escapeHtml(String(c.v))}</div><div class="sub">${escapeHtml(c.sub)}</div></div>`
    ).join("");
  }

  /* ---------- diff computation (alignment-driven) ---------- */
  // Build the list of row-pairings from the backend alignment, capped for render.
  function buildRows(data){
    const before = getBefore(data), after = getAfter(data);
    const align  = getAlignment(data);
    let rows = [];
    if (align){
      for (const op of align){
        if (op.type === "pair")        rows.push({ kind:"pair",    b:before[op.b], a:after[op.a], bi:op.b, ai:op.a });
        else if (op.type === "removed")rows.push({ kind:"removed", b:before[op.b], a:null,       bi:op.b, ai:null });
        else if (op.type === "added")  rows.push({ kind:"added",   b:null,       a:after[op.a],  bi:null,  ai:op.a });
      }
    } else {
      // Fallback: no alignment from backend — pair by index (overlap), then tail.
      const n = Math.min(before.length, after.length);
      for (let i=0;i<n;i++) rows.push({ kind:"pair", b:before[i], a:after[i], bi:i, ai:i });
      for (let i=n;i<before.length;i++) rows.push({ kind:"removed", b:before[i], a:null, bi:i, ai:null });
      for (let i=n;i<after.length;i++)  rows.push({ kind:"added",   b:null, a:after[i], bi:null, ai:i });
    }
    return rows.slice(0, RENDER_CAP);
  }

  function diffStats(data){
    const rows = buildRows(data);
    const colsAfter = new Set(getColsAfter(data));
    let changed = 0;
    for (const r of rows){
      if (r.kind !== "pair") continue;
      const b = r.b || {}, a = r.a || {};
      for (const c of colsAfter){
        if (norm(b[c]) !== norm(a[c])) changed++;
      }
    }
    return { changed };
  }
  function norm(v){ return v===undefined||v===null ? "" : String(v); }
  function num(v, fallback){ return (typeof v === "number" && isFinite(v)) ? v : fallback; }

  /* ---------- table rendering ---------- */
  document.querySelectorAll(".tab").forEach(t =>
    t.addEventListener("click", ()=> setView(t.dataset.view)));
  function setView(v){
    currentView = v;
    document.querySelectorAll(".tab").forEach(t => {
      const on = t.dataset.view===v;
      t.classList.toggle("active", on);
      t.setAttribute("aria-selected", on ? "true" : "false");
    });
    legend.style.display = v==="diff" ? "flex" : "none";
    renderTable();
  }

  function renderTable(){
    if (!lastResult){ return; }
    if (currentView === "before") tableWrap.innerHTML = plainTable(getBefore(lastResult), getColsBefore(lastResult));
    else if (currentView === "after") tableWrap.innerHTML = plainTable(getAfter(lastResult), getColsAfter(lastResult));
    else tableWrap.innerHTML = diffTable(lastResult);
  }

  // Infer column order from row-dict keys (fallback only — prefer backend columns).
  function columnsOf(rows){
    const seen = []; const set = new Set();
    for (const r of rows){ for (const k of Object.keys(r||{})){ if(!set.has(k)){ set.add(k); seen.push(k);} } }
    return seen;
  }

  function cellHtml(val){
    const s = norm(val);
    if (s === "") return '<td class="cell-empty">∅</td>';
    return `<td title="${escapeHtml(s)}">${escapeHtml(s)}</td>`;
  }

  function plainTable(rows, cols){
    if (!rows.length) return `<div class="empty-note">no rows</div>`;
    cols = (cols && cols.length) ? cols : columnsOf(rows);
    if (!cols.length) return `<div class="empty-note">no columns</div>`;
    const shown = rows.slice(0, RENDER_CAP);
    let h = '<table class="grid"><thead><tr><th>#</th>';
    h += cols.map(c=>`<th>${escapeHtml(c)}</th>`).join("");
    h += '</tr></thead><tbody>';
    shown.forEach((r,i)=>{
      h += `<tr><td class="rownum">${i+1}</td>`;
      h += cols.map(c=>cellHtml(r ? r[c] : "")).join("");
      h += '</tr>';
    });
    return h + '</tbody></table>';
  }

  /* Alignment-driven diff: rows are paired by the backend's content-based
     alignment (handles dropped/deduped rows correctly), not by naive index.
     Columns come from the backend's known column sets, so dropped/added
     columns are detected reliably rather than guessed. */
  function diffTable(data){
    const before = getBefore(data), after = getAfter(data);
    if (!before.length && !after.length) return `<div class="empty-note">no data</div>`;

    const colsAfter  = getColsAfter(data);
    const colsBefore = getColsBefore(data);
    const afterSet  = new Set(colsAfter);
    const beforeSet = new Set(colsBefore);
    // column order: kept/after columns first, then before-only (dropped) columns.
    const cols = [...colsAfter, ...colsBefore.filter(c=>!afterSet.has(c))];
    if (!cols.length) return `<div class="empty-note">no columns</div>`;

    const rows = buildRows(data);

    let h = '<table class="grid"><thead><tr><th>#</th>';
    h += cols.map(c=>{
      const dropped = !afterSet.has(c);
      return `<th${dropped?' style="color:var(--del)"':''}>${escapeHtml(c)}${dropped?' ✕':''}</th>`;
    }).join("");
    h += '</tr></thead><tbody>';

    let n = 0;
    for (const r of rows){
      n++;
      if (r.kind === "removed"){
        const b = r.b || {};
        h += `<tr class="row-removed"><td class="rownum" title="removed">−${n}</td>`;
        h += cols.map(c => cellHtml(b[c])).join("");
        h += '</tr>';
        continue;
      }
      if (r.kind === "added"){
        const a = r.a || {};
        h += `<tr class="row-added"><td class="rownum" title="added">+${n}</td>`;
        h += cols.map(c => afterSet.has(c) ? cellHtml(a[c]) : '<td class="cell-empty">∅</td>').join("");
        h += '</tr>';
        continue;
      }
      // pair
      const b = r.b || {}, a = r.a || {};
      h += `<tr><td class="rownum">${n}</td>`;
      h += cols.map(c=>{
        const dropped = !afterSet.has(c);
        if (dropped){
          const bv = norm(b[c]);
          return bv==="" ? '<td class="d-del cell-empty">∅</td>'
                         : `<td class="d-del" title="${escapeHtml(bv)} (column dropped)">${escapeHtml(bv)}</td>`;
        }
        const newCol = !beforeSet.has(c);
        const bv = norm(b[c]), av = norm(a[c]);
        if (newCol){
          return av==="" ? '<td class="d-add cell-empty">∅</td>'
                         : `<td class="d-add" title="${escapeHtml(av)} (new column)">${escapeHtml(av)}</td>`;
        }
        if (bv === av){
          return av==="" ? '<td class="cell-empty">∅</td>'
                         : `<td title="${escapeHtml(av)}">${escapeHtml(av)}</td>`;
        }
        // changed cell — show old → new
        const oldDisp = bv==="" ? "∅" : escapeHtml(bv);
        const newDisp = av==="" ? "∅" : escapeHtml(av);
        return `<td class="d-chg" title="${escapeHtml(bv)} → ${escapeHtml(av)}">`+
               `<span class="old">${oldDisp}</span><span class="arrow">→</span>${newDisp}</td>`;
      }).join("");
      h += '</tr>';
    }
    return h + '</tbody></table>';
  }

  /* ---------- minimal markdown renderer ---------- */
  function renderReport(md){
    const src = (typeof md === "string" && md.trim()) ? md : "*No report returned.*";
    reportBody.innerHTML = mdToHtml(src);
  }
  function mdToHtml(md){
    const lines = md.replace(/\r\n/g,"\n").split("\n");
    let out = [], inUl=false, inTable=false, tableBuf=[];
    const flushUl = ()=>{ if(inUl){ out.push("</ul>"); inUl=false; } };
    const flushTable = ()=>{
      if(!inTable) return;
      const rows = tableBuf.filter(r => !/^\s*\|?[\s:|-]+\|?\s*$/.test(r));
      let t = "<table>";
      rows.forEach((r,idx)=>{
        const cells = r.replace(/^\||\|$/g,"").split("|").map(c=>c.trim());
        const tag = idx===0 ? "th":"td";
        t += "<tr>"+cells.map(c=>`<${tag}>${inline(c)}</${tag}>`).join("")+"</tr>";
      });
      t += "</table>";
      out.push(t); inTable=false; tableBuf=[];
    };
    for (let raw of lines){
      const line = raw.replace(/\s+$/,"");
      if (line.trim().startsWith("|") && line.includes("|")){ flushUl(); inTable=true; tableBuf.push(line); continue; }
      else flushTable();

      if (/^#{1,6}\s/.test(line)){
        flushUl();
        const lvl = line.match(/^#+/)[0].length;
        out.push(`<h${Math.min(lvl,3)}>${inline(line.replace(/^#+\s*/,""))}</h${Math.min(lvl,3)}>`);
      } else if (/^\s*[-*]\s+/.test(line)){
        if(!inUl){ out.push("<ul>"); inUl=true; }
        out.push(`<li>${inline(line.replace(/^\s*[-*]\s+/,""))}</li>`);
      } else if (/^\s*---+\s*$/.test(line)){
        flushUl(); out.push("<hr/>");
      } else if (line.trim()===""){
        flushUl();
      } else {
        flushUl(); out.push(`<p>${inline(line)}</p>`);
      }
    }
    flushUl(); flushTable();
    return out.join("\n");
  }
  function inline(s){
    s = escapeHtml(s);
    s = s.replace(/`([^`]+)`/g, "<code>$1</code>");
    s = s.replace(/\*\*([^*]+)\*\*/g, "<strong>$1</strong>");
    // italics: *text* not adjacent to another * (so it won't eat ** bold)
    s = s.replace(/(^|[^*])\*([^*\s][^*]*?)\*(?!\*)/g, "$1<em>$2</em>");
    return s;
  }

  /* ---------- download ---------- */
  downloadBtn.addEventListener("click", ()=>{
    if (!lastResult || typeof lastResult.csv_text !== "string" || !lastResult.csv_text.length) return;
    const blob = new Blob([lastResult.csv_text], { type:"text/csv;charset=utf-8" });
    const url = URL.createObjectURL(blob);
    const a = document.createElement("a");
    a.href = url; a.download = "scrubbed.csv";
    document.body.appendChild(a); a.click(); a.remove();
    setTimeout(()=>URL.revokeObjectURL(url), 1000);
  });

  /* ---------- util ---------- */
  function escapeHtml(s){
    return String(s).replace(/[&<>"']/g, c => ({
      "&":"&amp;","<":"&lt;",">":"&gt;","\"":"&quot;","'":"&#39;"
    }[c]));
  }
</script>
</body>
</html>