/* ============================================================
   FitCheck, frontend logic (UI brick)
   Gathers inputs, calls the /api/advise connector, renders results.
   The backend currently returns input-aware PLACEHOLDER data; the
   real engine plugs into the same /api/advise contract later.
   ============================================================ */

// ---- Inline icon helpers (icons.js loads first) --------------------------
function ic(name) { return (window.ICONS && window.ICONS[name]) || ""; }
function hydrate(root) {
  (root || document).querySelectorAll("[data-ic]").forEach(el => {
    if (!el.dataset.done) { el.innerHTML = ic(el.dataset.ic); el.dataset.done = "1"; }
  });
}

// ---- Use-case taxonomy: the full realm, not just LLMs --------------------
const USE_CASES = [
  { icon: "cat-text", name: "Text & chat", items: [
    { id: "chat",      icon: "chat",      label: "Chatbot / assistant" },
    { id: "writing",   icon: "writing",   label: "Writing & summarising" },
    { id: "coding",    icon: "coding",    label: "Coding help" },
    { id: "agents",    icon: "agents",    label: "Agents & tool use" },
    { id: "rag",       icon: "rag",       label: "Chat with my documents" },
    { id: "translate", icon: "translate", label: "Translation" },
  ]},
  { icon: "cat-vision", name: "See & understand images", items: [
    { id: "vlm",     icon: "classify", label: "Chat about images (VLM)" },
    { id: "detect",  icon: "detect",   label: "Object detection (YOLO)" },
    { id: "segment", icon: "segment",  label: "Image segmentation" },
    { id: "pose",    icon: "pose",     label: "Pose / 6-DoF (FoundationPose)" },
    { id: "classify",icon: "classify", label: "Image classification" },
    { id: "depth",   icon: "depth",    label: "Depth estimation" },
    { id: "ocr",     icon: "ocr",      label: "Read text from images (OCR)" },
  ]},
  { icon: "cat-gen", name: "Create images & video", items: [
    { id: "imagegen", icon: "imagegen", label: "Generate images (SD / Flux)" },
    { id: "inpaint",  icon: "inpaint",  label: "Edit / inpaint images" },
    { id: "upscale",  icon: "upscale",  label: "Upscale / restore" },
    { id: "videogen", icon: "videogen", label: "Generate video" },
    { id: "bgremove", icon: "bgremove", label: "Remove backgrounds" },
  ]},
  { icon: "cat-audio", name: "Audio & speech", items: [
    { id: "stt",   icon: "stt",   label: "Speech to text (Whisper)" },
    { id: "tts",   icon: "tts",   label: "Text to speech / voice" },
    { id: "music", icon: "music", label: "Generate music" },
  ]},
  { icon: "cat-data", name: "Data & search", items: [
    { id: "embed",    icon: "embed",    label: "Semantic search / embeddings" },
    { id: "forecast", icon: "forecast", label: "Time-series forecasting" },
    { id: "tabular",  icon: "tabular",  label: "Predict from spreadsheets" },
  ]},
  { icon: "cat-custom", name: "Something else", items: [
    { id: "custom", icon: "custom", label: "Custom: describe it" },
  ]},
];

// ---- GPU lists per provider ----------------------------------------------
const GPUS = {
  none:   [],
  unsure: [],
  nvidia: [
    "RTX 5090 (32 GB)","RTX 5080 (16 GB)","RTX 5070 Ti (16 GB)","RTX 5070 (12 GB)","RTX 5060 (8 GB)",
    "RTX 4090 (24 GB)","RTX 4080 (16 GB)","RTX 4070 (12 GB)","RTX 4060 (8 GB)",
    "RTX 3090 (24 GB)","RTX 3080 (10 GB)","RTX 3070 (8 GB)","RTX 3060 (12 GB)","RTX 3050 (8 GB)",
    "GTX 1660 (6 GB)","GTX 1650 (4 GB)",
  ],
  // Laptop (Mobile) NVIDIA GPUs are different chips: less VRAM and roughly half
  // the memory bandwidth of the desktop card with the same name (a laptop 5090
  // is 24 GB, not 32). Shown when the computer is a laptop. VRAM in the label
  // feeds the engine; bandwidth comes from data/gpu_specs.json by name.
  nvidia_laptop: [
    "RTX 5090 Laptop (24 GB)","RTX 5080 Laptop (16 GB)","RTX 5070 Ti Laptop (12 GB)",
    "RTX 5070 Laptop (8 GB)","RTX 5060 Laptop (8 GB)","RTX 5050 Laptop (8 GB)",
    "RTX 4090 Laptop (16 GB)","RTX 4080 Laptop (12 GB)","RTX 4070 Laptop (8 GB)",
    "RTX 4060 Laptop (8 GB)","RTX 4050 Laptop (6 GB)",
    "RTX 3080 Ti Laptop (16 GB)","RTX 3080 Laptop (16 GB)","RTX 3070 Ti Laptop (8 GB)",
    "RTX 3070 Laptop (8 GB)","RTX 3060 Laptop (6 GB)","RTX 3050 Ti Laptop (4 GB)",
    "RTX 3050 Laptop (4 GB)","Laptop RTX (not sure of model)",
  ],
  amd:    ["RX 7900 XTX (24 GB)","RX 7800 XT (16 GB)","RX 7600 (8 GB)","RX 6700 XT (12 GB)","Built-in Radeon"],
  apple:  ["M-series base","M-series Pro","M-series Max","M-series Ultra"],
  intel:  ["Arc A770 (16 GB)","Arc A750 (8 GB)","Arc A380 (6 GB)","Built-in Intel graphics"],
};

const $ = (s) => document.querySelector(s);

// ---- XSS-safe rendering helpers -------------------------------------------
// Every dynamic value inserted via innerHTML must pass through one of these.
// esc(): plain-text escape (user input, model output, backend errors, Hub
//   metadata). safeUrl(): only http(s) hrefs (blocks javascript:). sanitizeHtml():
//   allowlist for the engine's intentionally-rich fields (detail/note/etc) so an
//   injected <script>/onerror is neutralised even if user input leaks into them.
const _ESC = { "&": "&amp;", "<": "&lt;", ">": "&gt;", '"': "&quot;", "'": "&#39;" };
function esc(s) { return String(s == null ? "" : s).replace(/[&<>"']/g, c => _ESC[c]); }
function safeUrl(u) {
  const s = String(u == null ? "" : u).trim();
  return /^https?:\/\//i.test(s) ? s : "#";
}
const _ALLOWED = { B: [], I: [], EM: [], STRONG: [], CODE: [], PRE: [], UL: [],
  OL: [], LI: [], BR: [], P: [], SPAN: ["class"], DIV: ["class"], A: ["href", "target", "rel"] };
function sanitizeHtml(html) {
  const tpl = document.createElement("template");
  tpl.innerHTML = String(html == null ? "" : html);
  tpl.content.querySelectorAll("*").forEach(el => {
    if (!el.parentNode) return;                       // dropped with an ancestor
    const allow = _ALLOWED[el.tagName];
    if (!allow) { el.replaceWith(document.createTextNode(el.textContent || "")); return; }
    [...el.attributes].forEach(a => {
      if (!allow.includes(a.name)) el.removeAttribute(a.name);
      else if (a.name === "href" && !/^https?:\/\//i.test(a.value.trim())) el.removeAttribute("href");
    });
  });
  return tpl.innerHTML;
}
const state = { mode: "have", task: "run", computer: "Windows laptop", provider: "none", priority: "balanced", usecases: ["chat"], checked: false };
let lastAdvice = null;   // the most recent /api/advise result, facts the model explains
let multiCache = null;   // {ucs, results} when several goals are checked at once

// ---- Buy-vs-check mode -----------------------------------------------------
function applyMode() {
  const buy = state.mode === "buy";
  ["#machine-step", "#priority-step", "#find-specs"].forEach(s => {
    const el = $(s); if (el) el.style.display = buy ? "none" : "";
  });
  syncCustomRepo();   // hides the model box in buy mode / when Custom isn't picked
  // The Run/Train toggle applies in buy mode too: "what should I buy to run X"
  // vs "to fine-tune X" are very different machines.
  $("#check-btn").innerHTML = (buy ? "What should I get? " : "Check my setup ")
    + '<span class="ic" data-ic="arrow"></span>';
  hydrate($("#check-btn"));
}

// ---- Build the use-case picker -------------------------------------------
function buildPicker() {
  const wrap = $("#usecase-picker");
  wrap.innerHTML = USE_CASES.map(g => `
    <div class="uc-group">
      <div class="uc-cat"><span class="ic" data-ic="${g.icon}"></span>${g.name}</div>
      <div class="uc-grid">
        ${g.items.map(it => `
          <button class="uc-pill${it.id === "chat" ? " active" : ""}" data-uc="${it.id}">
            <span class="pic ic" data-ic="${it.icon}"></span>${it.label}
          </button>`).join("")}
      </div>
    </div>`).join("");
  hydrate(wrap);

  // Pills toggle: pick one goal or several (several = checked together).
  wrap.querySelectorAll(".uc-pill").forEach(p => p.addEventListener("click", () => {
    const uc = p.dataset.uc;
    const i = state.usecases.indexOf(uc);
    if (i >= 0) {
      if (state.usecases.length > 1) { state.usecases.splice(i, 1); p.classList.remove("active"); }
    } else {
      state.usecases.push(uc);
      p.classList.add("active");
    }
    syncCustomRepo();
    maybeLiveUpdate();
  }));
}

// The model-URL box belongs to the "Custom: describe it" goal: it appears only
// when Custom is selected (and not in buy mode), and clears when you leave it,
// so unselecting Custom reverts to whatever else is picked.
function syncCustomRepo() {
  const show = state.usecases.includes("custom") && state.mode !== "buy";
  const field = $("#repo-field");
  const input = $("#repo-check");
  if (field) field.style.display = show ? "" : "none";
  if (input && !show && input.value) input.value = "";   // clear on leaving Custom
}

// ---- Segmented controls ---------------------------------------------------
function wireSegmented(id, key, after) {
  $(id).querySelectorAll(".seg-btn").forEach(b => b.addEventListener("click", () => {
    $(id).querySelectorAll(".seg-btn").forEach(x => x.classList.remove("active"));
    b.classList.add("active");
    state[key] = b.dataset.val;
    if (after) after();
    maybeLiveUpdate();
  }));
}
function setActive(id, val) {
  $(id).querySelectorAll(".seg-btn").forEach(b => b.classList.toggle("active", b.dataset.val === val));
}

// Run vs Train sliding switch, recomputes the recommendations for training.
function wireTaskToggle() {
  const tog = $("#task-toggle");
  if (!tog) return;
  tog.querySelectorAll(".tt-opt").forEach(b => b.addEventListener("click", () => {
    state.task = b.dataset.task;
    tog.querySelectorAll(".tt-opt").forEach(x => x.classList.toggle("active", x === b));
    tog.classList.toggle("train", state.task === "finetune");
    maybeLiveUpdate();
  }));
}

// ---- GPU select depends on provider --------------------------------------
function fillGpu() {
  // On a laptop, NVIDIA means the Mobile parts (different VRAM and bandwidth).
  const key = (state.provider === "nvidia" && /laptop/i.test(state.computer))
    ? "nvidia_laptop" : state.provider;
  const list = GPUS[key] || GPUS[state.provider] || [];
  const sel = $("#gpu");
  if (!list.length) { sel.style.display = "none"; sel.innerHTML = ""; }
  else { sel.style.display = "block"; sel.innerHTML = list.map(g => `<option>${g}</option>`).join(""); }
}
// Real machines only: a Windows laptop can't have Apple Silicon, a Pi can't
// take a desktop card. Impossible provider buttons get disabled per computer.
const PROVIDER_ALLOWED = {
  "Windows laptop": ["none", "nvidia", "amd", "intel", "unsure"],
  "Windows desktop": ["none", "nvidia", "amd", "intel", "unsure"],
  "Linux PC": ["none", "nvidia", "amd", "intel", "unsure"],
  "Mac": ["apple"],
  "Mini PC / Raspberry Pi": ["none", "nvidia", "unsure"],   // nvidia = Jetson boards
};

function syncProviderForComputer() {
  const allowed = PROVIDER_ALLOWED[state.computer] || ["none", "nvidia", "amd", "intel", "apple", "unsure"];
  $("#provider-seg").querySelectorAll(".seg-btn").forEach(b => {
    const ok = allowed.includes(b.dataset.val);
    b.classList.toggle("disabled", !ok);
    b.disabled = !ok;
  });
  if (!allowed.includes(state.provider)) {
    state.provider = allowed[0];
    setActive("#provider-seg", state.provider);
  }
  fillGpu();
  // Apple Silicon shares one memory pool, so the RAM field IS the unified memory
  // (the engine already budgets Apple off this number); label it honestly, and
  // disable the separate-VRAM box, which is meaningless on Apple.
  const isMac = state.computer === "Mac";
  const ramLabel = $("#ram-label");
  if (ramLabel) ramLabel.textContent = isMac ? "Unified memory" : "Memory (RAM)";
  const vram = $("#vram");
  if (vram) {
    vram.disabled = isMac;
    if (isMac) vram.value = "";   // no separate VRAM on Apple; clear any stale value
    vram.placeholder = isMac ? "Not applicable on Apple Silicon" : "e.g. 8";
  }
  const vramHint = $("#vram-hint");
  if (vramHint) {
    vramHint.textContent = isMac
      ? "Not used on Apple Silicon: it shares one unified memory pool, set above."
      : "Overrides the GPU picker above. Leave blank to use the picker.";
  }
}

// ---- Find-my-specs help text ---------------------------------------------
function findSpecsText() {
  const c = state.computer;
  if (c === "Mac") return `
    <ul style="margin:0;padding-left:18px">
      <li>Click the Apple menu (top-left), then <b>About This Mac</b>.</li>
      <li>It shows your chip (e.g. <i>Apple M2</i>) and <b>Memory</b> (e.g. <i>16 GB</i>).</li>
      <li>On a Mac that one memory number is all you need. The graphics share it.</li>
    </ul>`;
  if (c === "Linux PC" || c.includes("Mini PC")) return `
    <ul style="margin:0;padding-left:18px">
      <li><b>RAM:</b> run <code>free -h</code> in a terminal.</li>
      <li><b>Graphics card:</b> <code>nvidia-smi</code> (NVIDIA) or <code>lspci | grep VGA</code>.</li>
    </ul>`;
  return `
    <ul style="margin:0;padding-left:18px">
      <li><b>RAM:</b> press <code>Ctrl + Shift + Esc</code>, then <b>Performance</b>, then <b>Memory</b>.</li>
      <li><b>Graphics card:</b> same window, <b>GPU</b>. The name is top-right (e.g. <i>NVIDIA RTX 3060</i>).</li>
      <li>No real GPU listed? You have built-in graphics. Pick "None / built-in".</li>
    </ul>`;
}

// ---- Gather inputs & call the connector ----------------------------------
function gather() {
  const sel = $("#gpu");
  return {
    computer: state.computer,
    ram_gb: parseFloat($("#ram").value),
    provider: state.provider,
    gpu: sel.style.display === "none" ? "" : sel.value,
    vram_gb: $("#vram").value ? parseFloat($("#vram").value) : null,
    paste: $("#paste").value.trim(),
    usecase: state.usecases[0],
    usecases: state.usecases.slice(),
    priority: state.priority,
    mode: state.task,            // "run" (inference) or "finetune" (training)
    repo: $("#repo-check") ? $("#repo-check").value.trim() : "",
  };
}

let debounce;
function maybeLiveUpdate() {
  if (!state.checked) return;
  clearTimeout(debounce);
  debounce = setTimeout(check, 200);
}

async function check() {
  state.checked = true;
  const payload = gather();
  try {
    if (state.mode === "buy") {
      const res = await fetch("/api/minspecs", {
        method: "POST", headers: { "Content-Type": "application/json" },
        body: JSON.stringify({ usecases: state.usecases, mode: state.task }),
      });
      renderBuy(await res.json());
      return;
    }
    // A specific model named in the box takes over: we check THAT model and
    // remake the whole answer for it, rather than show the goal list.
    if (payload.repo) { multiCache = null; await lookupRepo(payload); return; }
    if (state.usecases.length > 1) {
      const results = await Promise.all(state.usecases.map(u =>
        fetch("/api/advise", {
          method: "POST", headers: { "Content-Type": "application/json" },
          body: JSON.stringify({ ...payload, usecase: u }),
        }).then(r => r.json())));
      multiCache = { ucs: state.usecases.slice(), results };
      renderMulti(results);
      return;
    }
    multiCache = null;
    const res = await fetch("/api/advise", {
      method: "POST", headers: { "Content-Type": "application/json" },
      body: JSON.stringify(payload),
    });
    render(await res.json());
  } catch (e) {
    $("#results").innerHTML = `<div class="empty-state"><div class="big"><span class="ic" data-ic="monitor"></span></div>
      <p>Couldn't reach the advisor: ${esc(e && e.message ? e.message : e)}</p></div>`;
    hydrate($("#results"));
  }
}

// ---- Live single-model lookup (the one online feature, labelled as such) ---
// Naming a model remakes the whole answer for it: a catalogue match (or a
// finetune that walks to a catalogue base) re-renders the full breakdown; a
// model we don't know falls back to clearly-labelled raw parameter math.
async function lookupRepo(payload) {
  $("#results").innerHTML = `<div class="reveal"><div class="ans-loading"><span class="spinner"></span> Looking up ${esc(payload.repo)} on Hugging Face...</div></div>`;
  let d;
  try {
    const res = await fetch("/api/lookup", {
      method: "POST", headers: { "Content-Type": "application/json" },
      body: JSON.stringify(payload),
    });
    d = await res.json();
  } catch (e) {
    $("#results").innerHTML = `<div class="ans-card ans-error"><h3>Lookup failed</h3><p>${esc(e && e.message ? e.message : e)}</p></div>`;
    hydrate($("#results")); return;
  }
  if (d.error) {
    $("#results").innerHTML = `<div class="ans-card ans-error"><h3>Couldn't check that model</h3><p>${esc(d.error)}</p></div>`;
    hydrate($("#results")); return;
  }
  // Catalogue match (directly, or via the finetune -> base walk): remake the
  // full breakdown for the resolved model, then explain the link on top.
  if (d.match === "catalogue" && d.focus_name) {
    const uc = d.uc_key || (lastAdvice && lastAdvice.usecase) || state.usecases[0];
    const res = await fetch("/api/advise", {
      method: "POST", headers: { "Content-Type": "application/json" },
      body: JSON.stringify({ ...payload, usecase: uc, focus: d.focus_name }),
    });
    render(await res.json());
    const wrap = $("#results").firstElementChild;
    if (wrap) {
      const banner = document.createElement("div");
      banner.className = "lookup-banner";
      banner.innerHTML = `<span class="live-tag">Live Hugging Face lookup</span><p>${sanitizeHtml(d.explain || "")}</p>`;
      wrap.prepend(banner);
    }
    return;
  }
  // Not in the catalogue: the engine still built a FULL breakdown from the
  // looked-up parameter count. Render it like any result, with an estimate banner.
  if (d.match === "estimate" && d.advice) {
    render(d.advice);
    const wrap = $("#results").firstElementChild;
    if (wrap) {
      const banner = document.createElement("div");
      banner.className = "lookup-banner estimate";
      banner.innerHTML = `<span class="live-tag">Live Hugging Face lookup / estimate</span><p>${sanitizeHtml(d.explain || "")}</p>`;
      wrap.prepend(banner);
    }
    return;
  }
  // Last resort: a bare error/explain with no advice payload.
  $("#results").innerHTML = `<div class="ans-card"><h3>${esc(payload.repo)}</h3><p>${sanitizeHtml(d.explain || "No estimate available.")}</p></div>`;
  hydrate($("#results"));
}

// ---- Multi-goal overview (several goals checked at once) -------------------
function renderMulti(results) {
  const ok = results.filter(d => d.verdict === "great").length;
  const cards = results.map((d, i) => {
    const v = VMAP[d.verdict] || VMAP.tight;
    const need = (d.gauge || {}).need_gb || "";
    return `
      <div class="goal-card" data-i="${i}" style="--status:${v.cls};--status-soft:${v.soft}">
        <div class="goal-top"><span class="badge"><span class="dot"></span>${esc(d.verdict_word || v.word)}</span></div>
        <div class="goal-name">${esc(d.use_case || "")}</div>
        <div class="goal-pick">${d.headline_model ? `<span class="ic" data-ic="arrow"></span>${esc(d.headline_model)}` : "Nothing realistic on this machine"}</div>
        <div class="goal-need">${esc(need)}</div>
        <div class="goal-more">See full breakdown</div>
      </div>`;
  }).join("");
  $("#results").innerHTML = `
    <div class="reveal">
      <div id="lookup-result"></div>
      <div class="verdict" style="--status:var(--accent);--status-soft:var(--accent-soft)">
        <span class="badge"><span class="dot"></span>${results.length} goals checked</span>
        <h2>${ok} of ${results.length} run great on this machine.</h2>
        <p>Each goal is checked independently with the same conservative engine. Click any card for the full honest breakdown, links and commands.</p>
      </div>
      <div class="goal-grid">${cards}</div>
    </div>`;
  hydrate($("#results"));
  $("#results").querySelectorAll(".goal-card").forEach(c => c.addEventListener("click", () => {
    render(multiCache.results[parseInt(c.dataset.i, 10)]);
  }));
  $("#cat-version").textContent = (results[0] || {}).catalogue_version || "local";
}

// Split a comma-joined build string into a ruled spec sheet, one component per
// row with an icon inferred from the part. Unknown parts get a neutral marker.
function specParts(spec) {
  return String(spec || "").split(/\s*,\s*/).filter(Boolean).map(part => {
    const p = part.toLowerCase();
    let icon = "custom";
    if (/nvme|ssd|hdd|storage|\btb\b/.test(p)) icon = "storage";
    else if (/rtx|radeon|geforce|\barc\b|gpu|vram|\brx ?\d|nvidia|graphics/.test(p)) icon = "gpu";
    else if (/ddr|\bram\b|memory/.test(p)) icon = "ram";
    else if (/core|\bcpu\b|ryzen|threadripper|processor|\bi[3579]\b/.test(p)) icon = "cpu";
    return `<li><span class="ic" data-ic="${icon}"></span><span>${esc(part)}</span></li>`;
  }).join("");
}

// ---- Buy-advice render: multi-platform, click any card for what to look for -
function renderBuy(d) {
  const ft = d.mode === "finetune";
  const verb = ft ? "fine-tune" : "run";
  const multi = (d.goals || []).length > 1;
  const tierCard = (t, kind) => {
    if (!t) return `<div class="buy-card empty">
      <div class="bc-head"><span class="bc-kind ${kind}">${kind === "min" ? "Minimum" : "Comfortable"}</span></div>
      <p class="bc-none">No build on this platform ${ft ? "trains" : "runs"} ${multi ? "all of these" : "this"}${ft ? "" : " well"}, it wants more than this ladder offers.</p>
    </div>`;
    if (t.ceiling) return `<div class="buy-card ceiling">
      <div class="bc-head"><span class="bc-kind ${kind}">Comfortable</span><span class="ic" data-ic="check"></span></div>
      <p class="bc-none">The minimum build is already the most capable ${ft ? "training " : ""}box on this platform for ${multi ? "these goals" : "this goal"}. Nothing bigger is needed here.</p>
    </div>`;
    const goalsHtml = multi
      ? `<ul class="bc-goals">${t.goals.map(g => `<li><span>${esc(g.goal)}</span><b>${esc(g.model)}</b>${g.verdict === "tight" ? " <i>(tight)</i>" : ""}</li>`).join("")}</ul>`
      : `<div class="bc-runs">${ft ? "Can train up to" : "Runs"} <b>${esc(t.runs)}</b>${t.goals[0] && t.goals[0].verdict === "tight" ? " <i>(tight)</i>" : ""}</div>`;
    return `<div class="buy-card">
      <div class="bc-head"><span class="bc-kind ${kind}">${kind === "min" ? "Minimum" : "Comfortable"}</span><span class="tag ${kind === "min" ? "mid" : "best"}">${esc(t.price)}</span></div>
      <div class="bc-label">${esc(t.label)}</div>
      ${goalsHtml}
      <button class="bc-more">What to look for <span class="chev ic" data-ic="chevron"></span></button>
      <div class="bc-detail" hidden>
        <div class="bc-detail-label">Build</div>
        <ul class="bc-spec">${specParts(t.spec)}</ul>
        <div class="bc-detail-label">Why this build</div>
        <p>${esc(t.detail)}</p>
        ${t.link ? `<a class="bc-link" href="${safeUrl(t.link)}" target="_blank" rel="noopener noreferrer">Check current price <span class="bc-link-meta">our estimate ${esc(t.price)}, ${esc(t.price_checked || "")}</span><span class="ic" data-ic="arrow"></span></a>` : ""}
      </div>
    </div>`;
  };
  const platforms = (d.platforms || []).map(p => `
    <div class="buy-platform">
      <div class="bp-head"><span class="ic" data-ic="${esc(p.icon)}"></span><span class="bp-name">${esc(p.name)}</span></div>
      <div class="bp-blurb">${esc(p.blurb)}</div>
      <div class="buy-grid">${tierCard(p.minimum, "min")}${tierCard(p.comfortable, "comfy")}</div>
    </div>`).join("");
  $("#results").innerHTML = `
    <div class="reveal">
      <div class="verdict" style="--status:var(--accent);--status-soft:var(--accent-soft)">
        <span class="badge"><span class="dot"></span>Buying advice, to ${verb}</span>
        <h2>What to buy to ${verb} ${esc((d.use_case || "this").toLowerCase())}</h2>
        <p>${esc(d.disclaimer || "")}</p>
        ${d.note ? `<div class="note">${sanitizeHtml(d.note)}</div>` : ""}
      </div>
      ${platforms}
    </div>`;
  hydrate($("#results"));
  $("#results").querySelectorAll(".buy-card .bc-more").forEach(b => b.addEventListener("click", () => {
    const det = b.nextElementSibling;
    const opening = det.hasAttribute("hidden");
    if (opening) det.removeAttribute("hidden"); else det.setAttribute("hidden", "");
    b.classList.toggle("open", opening);
  }));
  $("#cat-version").textContent = d.catalogue_version || "local";
}

// ---- Render results -------------------------------------------------------
const VMAP = {
  great: { cls: "var(--ok)",   soft: "var(--ok-soft)",   word: "Runs great",       ic: "check" },
  tight: { cls: "var(--warn)", soft: "var(--warn-soft)", word: "Tight, but works",  ic: "approx" },
  no:    { cls: "var(--no)",   soft: "var(--no-soft)",   word: "Won't fit",         ic: "x" },
};

function render(d) {
  lastAdvice = d;
  const v = VMAP[d.verdict] || VMAP.tight;
  const g = d.gauge || {};
  $("#cat-version").textContent = d.catalogue_version || "local";

  const licChip = (o) => {
    if (!o.license) return "";
    const note = (o.license_note || "").toLowerCase();
    const warn = note.includes("non-commercial") || note.includes("agpl") || note.includes("research");
    const label = o.license.replace("apache-2.0", "Apache 2.0").replace("mit", "MIT")
                           .replace("agpl-3.0", "AGPL").replace("cc-by-nc-4.0", "CC-NC");
    return `<span class="lic${warn ? " warn" : ""}" title="${esc(o.license_note || o.license)}">${esc(label)}</span>`
         + (o.gated ? `<span class="lic gatechip" title="Accept the terms on Hugging Face once before downloading">gated</span>` : "");
  };
  const current = d.focus || d.headline_model;
  const opts = (d.options || []).map(o => {
    const ov = VMAP[o.verdict] || VMAP.tight;
    const name = o.url
      ? `<a href="${safeUrl(o.url)}" target="_blank" rel="noopener">${esc(o.model)}</a>` : esc(o.model);
    const cur = o.model === current ? " opt-current" : "";
    return `<div class="opt${cur}" data-model="${esc(o.model)}" style="--status:${ov.cls};--status-soft:${ov.soft}">
      <div class="vdot"><span class="ic" data-ic="${ov.ic}"></span></div>
      <div><div class="name">${name}${licChip(o)}</div><div class="desc">${esc(o.desc)}</div></div>
      <div class="meta"><b>${esc(o.memory)}</b><div class="feel">${esc(o.setting)}${o.feel && o.feel !== "-" ? " / " + esc(o.feel) : ""}</div></div>
    </div>`;
  }).join("");

  const tools = (d.tools || []).map((t, i) => `
    <div class="tool">
      <div class="tool-head"><span class="tname">${esc(t.name)}</span>
        <span class="tag ${i===0?"best":"mid"}">${i===0?"Start here":esc(t.tag)}</span></div>
      <div class="twhat">${esc(t.what)}</div>
      <div class="tinstall"><span class="ic" data-ic="download"></span>${esc(t.install)}</div>
    </div>`).join("");

  const cmds = (d.commands?.items || []).map((c) => `
    <div class="cmd-box">
      <div class="cmd-label">${esc(c.label)}<button class="copy-btn" data-code="${encodeURIComponent(c.code)}">Copy</button></div>
      <pre><code>${esc(c.code)}</code></pre>
    </div>`).join("");

  const isFT = d.mode === "finetune";
  const cloud = isFT && (d.cloud || []).length ? `
    <div class="section-title">Train it in the cloud <span class="sub">when your machine is too small, or you'd rather not tie it up</span></div>
    <div class="tool-grid">
      ${d.cloud.map(c => `
        <div class="tool">
          <div class="tool-head"><span class="tname">${esc(c.name)}</span><span class="tag mid">${esc(c.cost)}</span></div>
          <div class="twhat">${esc(c.what)}</div>
          <div class="tinstall"><a href="${safeUrl(c.link)}" target="_blank" rel="noopener"><span class="ic" data-ic="arrow"></span>Open</a></div>
        </div>`).join("")}
    </div>` : "";

  $("#results").innerHTML = `
    <div class="reveal">
      <div id="lookup-result"></div>
      <div class="verdict" style="--status:${v.cls};--status-soft:${v.soft}">
        <span class="badge"><span class="dot"></span>${esc(d.verdict_word || v.word)}</span>
        <h2>${sanitizeHtml(d.headline || "")}</h2>
        <p>${sanitizeHtml(d.detail || "")}</p>
        ${d.note ? `<div class="note">${sanitizeHtml(d.note)}</div>` : ""}
      </div>

      ${g.fill_pct != null ? `
      <div class="gauge-card" style="--status:${v.cls}">
        <div class="gauge-top"><span class="label" style="margin:0">Memory needed vs. what you have</span>
          <span class="need">${esc(g.need_gb)}</span></div>
        <div class="gauge-wrap">
          <div class="gauge" style="--pct:${g.fill_pct};--gcolor:${v.cls}">
            <div class="gauge-fill"></div>
          </div>
          ${g.has_fast && g.fast_label ? `<div class="gmark gmark-gpu" style="left:${g.mark_pct}%" data-tip="${esc(g.fast_label)}, your graphics card's own memory. A model that fits left of this line runs at full GPU speed."><span class="gmark-lab">${esc(g.fast_label.replace("On the GPU ","").replace("GPU can use","GPU"))} ${esc(g.fast_gb)}</span></div>` : ""}
          <div class="gmark gmark-total" style="left:${g.total_pct}%" data-tip="${g.has_fast ? "Everything available: GPU memory plus the system RAM a model can spill into (the spilled part runs slower)." : "Your system RAM, with no graphics card the model runs here on the processor."}"><span class="gmark-lab">${esc(g.total_label)} ${esc(g.total_gb)}</span></div>
        </div>
        <div class="gauge-legend">
          ${(g.breakdown||[]).map(b=>`<span class="item"><span class="sw" style="background:${esc(b.color)}"></span>${esc(b.label)}</span>`).join("")}
          <span class="item gauge-hint">The lines mark what you have; the bar is what the model needs.</span>
        </div>
        ${d.provenance ? `<div class="prov">${sanitizeHtml(d.provenance)}</div>` : ""}
      </div>` : ""}

      ${d.speed ? `
      <details class="disc viz-disc" open>
        <summary><span class="ic sum-ic" data-ic="speed"></span>Why this speed? <span class="sub-inline">real benchmark runs, and where you land</span> <span class="chev ic" data-ic="chevron"></span></summary>
        <div class="disc-body">
          <div id="roofline-chart" class="roofline-wrap"></div>
          <p class="viz-caption">
            Every grey dot is a <b>real benchmark run</b> from the
            <a href="https://www.localscore.ai" target="_blank" rel="noopener">LocalScore</a> community database.
            Generation speed tracks <b>memory bandwidth</b>, that's the one number that matters most for local AI
            (<a href="https://kipp.ly/transformer-inference-arithmetic/" target="_blank" rel="noopener">why</a>).
            The dashed line is the theoretical ceiling for <b>${esc(d.speed.model)}</b> at your setting;
            your machine is the marked dot at about <b>${esc(d.speed.tps)} tok/s</b>
            (${d.speed.method === "measured-model"
              ? `predicted by a model trained on these measurements, following IBM's <a href="https://arxiv.org/abs/2410.02425" target="_blank" rel="noopener">LLM-Pilot</a> methodology`
              : `an analytical estimate; a learned predictor trained on these runs, <a href="https://arxiv.org/abs/2410.02425" target="_blank" rel="noopener">LLM-Pilot</a> methodology, takes over once trained`}).
          </p>
        </div>
      </details>` : ""}

      ${opts ? `<div class="section-title">${isFT ? "What you can fine-tune" : "What you can run"} <span class="sub">biggest to smallest, click any model for its full breakdown; names link to Hugging Face</span></div>
      <div class="opt-grid">${opts}</div>` : ""}

      ${tools ? `<div class="section-title">${isFT ? "How to fine-tune it" : "How to actually run it"}</div>
      <div class="tool-grid">${tools}</div>` : ""}

      ${cloud}

      ${cmds ? `<div class="section-title">Copy-paste to get started</div>
      <p class="cmd-intro">${esc(d.commands.intro || "")}</p>
      <div class="cmd">${cmds}</div>` : ""}

      <div class="section-title">Ask a follow-up <span class="sub">explained in plain words, from the numbers above</span></div>
      <div class="ask">
        <div class="ask-row">
          <input id="ask-input" type="text" autocomplete="off"
                 placeholder="e.g. Why not the bigger model? What does 4-bit mean?" />
          <button id="ask-send" class="ask-btn" title="Ask"><span class="ic" data-ic="arrow"></span></button>
        </div>
        <div class="ask-chips">
          <button class="ask-chip">Why this model?</button>
          <button class="ask-chip">What does the setting mean?</button>
          <button class="ask-chip">Will it feel fast?</button>
        </div>
        <div id="ask-answer" class="ask-answer" hidden></div>
      </div>
    </div>`;

  if (multiCache) {
    const back = document.createElement("button");
    back.className = "back-link";
    back.innerHTML = '<span class="ic" data-ic="arrow"></span>All goals';
    back.addEventListener("click", () => renderMulti(multiCache.results));
    $("#results").firstElementChild.prepend(back);
  }
  hydrate($("#results"));
  if (d.speed) drawRoofline(d.speed);
  $("#results").querySelectorAll(".copy-btn").forEach(b => b.addEventListener("click", () => {
    navigator.clipboard.writeText(decodeURIComponent(b.dataset.code));
    b.textContent = "Copied"; b.classList.add("done");
    setTimeout(() => { b.textContent = "Copy"; b.classList.remove("done"); }, 1500);
  }));
  // Click any option card to re-render the whole breakdown for THAT model.
  $("#results").querySelectorAll(".opt[data-model]").forEach(card =>
    card.addEventListener("click", (ev) => {
      if (ev.target.closest("a")) return;   // let the Hugging Face link open
      focusModel(card.dataset.model);
    }));
  wireAsk();
}

// Re-run the engine focused on one specific model and scroll the answer up.
async function focusModel(model) {
  const uc = (lastAdvice && lastAdvice.usecase) || state.usecases[0];
  try {
    const res = await fetch("/api/advise", {
      method: "POST", headers: { "Content-Type": "application/json" },
      body: JSON.stringify({ ...gather(), usecase: uc, focus: model }),
    });
    render(await res.json());
    $("#results").scrollIntoView({ behavior: "smooth", block: "start" });
  } catch (e) {
    /* leave the current view in place on a transient failure */
  }
}

// ---- "Why this speed?" roofline scatter (real LocalScore runs) ------------
let _rooflinePts = null;
async function getRooflinePoints() {
  if (_rooflinePts) return _rooflinePts;
  try {
    const r = await fetch("/static/roofline.json");
    // Only memoize on success - caching a transient failure would kill the
    // roofline scatter for the rest of the session with no way to recover.
    _rooflinePts = await r.json();
    return _rooflinePts;
  } catch (e) { return { points: [] }; }
}

async function drawRoofline(speed) {
  const host = $("#roofline-chart");
  if (!host) return;
  const data = await getRooflinePoints();
  const pts = (data.points || []).filter(p => p.bw > 0 && p.tps > 0.5);
  if (!pts.length && !speed) { host.innerHTML = ""; return; }

  const W = 720, H = 320, L = 52, R = 16, T = 14, B = 40;
  const xmin = 40, xmax = 2100, ymin = 0.8, ymax = 400;
  const lx = v => L + (Math.log10(v) - Math.log10(xmin)) / (Math.log10(xmax) - Math.log10(xmin)) * (W - L - R);
  const ly = v => H - B - (Math.log10(v) - Math.log10(ymin)) / (Math.log10(ymax) - Math.log10(ymin)) * (H - T - B);

  let s = `<svg viewBox="0 0 ${W} ${H}" role="img" aria-label="Decode speed vs memory bandwidth, real benchmark runs">`;
  // gridlines + labels
  for (const gx of [50, 100, 200, 400, 800, 1600]) {
    s += `<line x1="${lx(gx)}" y1="${T}" x2="${lx(gx)}" y2="${H - B}" class="rl-grid"/>` +
         `<text x="${lx(gx)}" y="${H - B + 16}" class="rl-tick" text-anchor="middle">${gx}</text>`;
  }
  for (const gy of [1, 3, 10, 30, 100, 300]) {
    s += `<line x1="${L}" y1="${ly(gy)}" x2="${W - R}" y2="${ly(gy)}" class="rl-grid"/>` +
         `<text x="${L - 6}" y="${ly(gy) + 4}" class="rl-tick" text-anchor="end">${gy}</text>`;
  }
  s += `<text x="${(L + W - R) / 2}" y="${H - 6}" class="rl-axis" text-anchor="middle">memory bandwidth (GB/s, log)</text>`;
  s += `<text x="14" y="${(T + H - B) / 2}" class="rl-axis" text-anchor="middle" transform="rotate(-90 14 ${(T + H - B) / 2})">decode tok/s (log)</text>`;

  // real measurement dots, shaded by model size
  const shade = p => p.params_b <= 2 ? "rl-p1" : (p.params_b <= 9 ? "rl-p8" : "rl-p14");
  for (const p of pts) {
    if (p.bw < xmin || p.tps < ymin) continue;
    s += `<circle cx="${lx(Math.min(p.bw, xmax)).toFixed(1)}" cy="${ly(Math.min(p.tps, ymax)).toFixed(1)}" r="2.6" class="rl-dot ${shade(p)}" data-m="${esc(p.model)}" data-a="${esc(p.accel)}" data-t="${esc(p.tps)}" data-b="${esc(Math.round(p.bw))}" data-p="${esc(p.params_b)}"></circle>`;
  }

  if (speed) {
    // theoretical ceiling for the recommended model, with the same per-token
    // overhead the engine uses (so tiny models plateau, not shoot to 1000s).
    const bytes = speed.bytes_gb || 5;
    const x1 = xmin, x2 = xmax;
    const f = bw => Math.min(Math.max(1 / (bytes / (bw * 0.6) + 0.0032), ymin), ymax);
    s += `<line x1="${lx(x1)}" y1="${ly(f(x1))}" x2="${lx(x2)}" y2="${ly(f(x2))}" class="rl-roof"/>`;
    // your machine
    const ux = lx(Math.min(Math.max(speed.eff_bw || speed.bw, xmin), xmax));
    const uy = ly(Math.min(Math.max(speed.tps, ymin), ymax));
    s += `<line x1="${ux}" y1="${ly(Math.min(Math.max(speed.lo, ymin), ymax))}" x2="${ux}" y2="${ly(Math.min(Math.max(speed.hi, ymin), ymax))}" class="rl-band"/>`;
    // flip the label to the left when the dot sits near the right edge
    const flip = ux > W * 0.72;
    s += `<circle cx="${ux}" cy="${uy}" r="6" class="rl-you" data-you="1" data-m="${esc(speed.model)}" data-t="${esc(speed.tps)}" data-b="${esc(Math.round(speed.eff_bw || speed.bw))}"/>` +
         `<text x="${flip ? ux - 10 : ux + 10}" y="${uy + 4}" class="rl-you-label" text-anchor="${flip ? "end" : "start"}">you ~${speed.tps} tok/s</text>`;
  }
  s += `</svg>
    <div class="rl-legend">
      <span class="item"><span class="sw rl-p1-sw"></span>~1B model runs</span>
      <span class="item"><span class="sw rl-p8-sw"></span>~8B runs</span>
      <span class="item"><span class="sw rl-p14-sw"></span>~14B runs</span>
      <span class="item"><span class="sw rl-roof-sw"></span>theoretical ceiling (your pick)</span>
      <span class="item"><span class="sw rl-you-sw"></span>your machine</span>
    </div>`;
  host.innerHTML = s;

  // Hover any dot for a plain-words info bubble: what model, what hardware,
  // how fast, at what bandwidth. The whole point of the chart is legibility.
  host.style.position = "relative";
  const tip = document.createElement("div");
  tip.className = "rl-tip"; tip.hidden = true;
  host.appendChild(tip);
  const svg = host.querySelector("svg");
  if (svg) {
    svg.addEventListener("mousemove", (e) => {
      const t = e.target;
      const cls = t.getAttribute && t.getAttribute("class");
      if (!cls || (!cls.includes("rl-dot") && !cls.includes("rl-you"))) { tip.hidden = true; return; }
      const d = t.dataset;
      tip.innerHTML = d.you
        ? `<b>Your machine</b><br>${esc(d.m || "your pick")} ~ <b>${esc(d.t)} tok/s</b><br><span class="rl-tip-sub">at ~${esc(d.b)} GB/s memory bandwidth</span>`
        : `<b>${esc(d.m || "model")}</b>${d.p ? ` / ${esc(d.p)}B` : ""}<br>${esc(d.a || "")}<br><b>${esc(d.t)} tok/s</b> <span class="rl-tip-sub">at ~${esc(d.b)} GB/s</span>`;
      tip.hidden = false;
      const r = host.getBoundingClientRect();
      const x = e.clientX - r.left, y = e.clientY - r.top;
      tip.style.left = Math.min(x + 14, host.clientWidth - 150) + "px";
      tip.style.top = Math.max(y - 10, 0) + "px";
    });
    svg.addEventListener("mouseleave", () => { tip.hidden = true; });
  }
}

// ---- Live progress ticker (gradio-style elapsed seconds) -------------------
function startTicker(el, base) {
  const t0 = Date.now();
  el.dataset.ticking = "1";
  const tick = () => {
    if (el.dataset.ticking !== "1") return;
    const s = Math.round((Date.now() - t0) / 1000);
    el.innerHTML = `<span class="spinner"></span> ${base}, ${s}s` +
      (s > 8 ? " <span class='tick-note'>(cold start: the model is waking, up to ~1 min)</span>" : "");
    setTimeout(tick, 500);
  };
  tick();
  return () => { el.dataset.ticking = "0"; };
}

// ---- Paste box: the fine-tuned spec parser fills the form -----------------
async function parsePaste() {
  const text = $("#paste").value.trim();
  const hint = $("#parse-hint");
  const btn = $("#parse-btn");
  if (!text) { hint.textContent = "Type or paste something first."; return; }
  if (btn.disabled) return;          // one in-flight call, ever, GPU time is real money
  btn.disabled = true;
  const stop = startTicker(hint, "Reading your description");
  try {
    const client = await getClient();
    const r = await client.predict("/parse", { text });
    const d = Array.isArray(r.data) ? r.data[0] : r.data;
    stop();
    if (d.error) { hint.textContent = `Failed: ${d.error}`; return; }
    applyParsed(d, hint);
  } catch (e) {
    stop();
    hint.textContent = `Failed: ${e && e.message ? e.message : e}`;
  } finally {
    btn.disabled = false;
  }
}

function applyParsed(d, hint) {
  const got = [];
  if (d.computer) {
    state.computer = d.computer;
    setActive("#computer-seg", d.computer);
    syncProviderForComputer();
    got.push(d.computer);
  }
  if (d.provider) {
    state.provider = d.provider;
    setActive("#provider-seg", d.provider);
    fillGpu();
    got.push(d.provider.toUpperCase());
  } else {
    // Graphics not mentioned: reset to "unspecified" so a previous machine's GPU
    // does not carry over (the parser returns null, not "none", on purpose, since
    // it must not assume). Respect computer limits: a Mac stays Apple, since
    // syncProviderForComputer already forced it and "unsure" is not allowed there.
    const allowed = PROVIDER_ALLOWED[state.computer] || ["none", "nvidia", "amd", "intel", "apple", "unsure"];
    if (allowed.includes("unsure")) {
      state.provider = "unsure";
      setActive("#provider-seg", "unsure");
      fillGpu();
    }
  }
  if (d.gpu) {
    const sel = $("#gpu");
    const want = String(d.gpu).toLowerCase().replace(/\b(nvidia|geforce|amd|radeon|intel)\b/g, "").trim();
    const match = [...sel.options].find(o => o.value.toLowerCase().includes(want));
    if (match) { sel.value = match.value; got.push(match.value); }
    else if (d.vram_gb) { $("#vram").value = d.vram_gb; got.push(`${d.gpu} (${d.vram_gb} GB)`); }
    else got.push(d.gpu);
  } else if (d.vram_gb) {
    $("#vram").value = d.vram_gb;
    got.push(`${d.vram_gb} GB VRAM`);
  } else {
    $("#vram").value = "";   // no GPU or VRAM mentioned: clear any stale value from a prior parse
  }
  if (d.ram_gb) {
    const ram = $("#ram");
    const opt = [...ram.options].map(o => parseFloat(o.value))
      .reduce((a, b) => Math.abs(b - d.ram_gb) < Math.abs(a - d.ram_gb) ? b : a);
    ram.value = `${opt} GB`;
    got.push(`${d.ram_gb} GB RAM`);
  }
  hint.textContent = got.length
    ? `Understood: ${got.join(", ")}. Anything you didn't mention stayed blank, confirm and press Check.`
    : "Couldn't find any specs in that text, nothing was filled in (the parser doesn't guess).";
  maybeLiveUpdate();
}

// ---- Follow-up: the model brick (grounded explainer) ---------------------
function wireAsk() {
  const input = $("#ask-input"), send = $("#ask-send");
  if (!input || !send) return;
  const go = () => askQuestion(input.value);
  send.addEventListener("click", go);
  input.addEventListener("keydown", e => { if (e.key === "Enter") go(); });
  $("#results").querySelectorAll(".ask-chip").forEach(c =>
    c.addEventListener("click", () => { input.value = c.textContent; askQuestion(c.textContent); }));
}

let askBusy = false;
async function askQuestion(question) {
  question = (question || "").trim();
  const box = $("#ask-answer");
  if (!question || !box || askBusy) return;
  askBusy = true;
  box.hidden = false;
  box.innerHTML = `<div class="ans-loading" id="ask-tick"></div>`;
  const stop = startTicker($("#ask-tick"), "Thinking it through");
  try {
    const a = await callAsk(question, JSON.stringify(lastAdvice || {}));
    stop();
    renderAnswer(box, a);
  } catch (e) {
    stop();
    // Surface the real error, never a generic stand-in.
    box.innerHTML = `<div class="ans-card ans-error"><h3>The explainer hit an error</h3><p>${esc(e && e.message ? e.message : e)}</p></div>`;
  } finally {
    askBusy = false;
  }
}

function renderAnswer(box, a) {
  a = a || {};
  if (a.error) {   // surface the real error from the model brick, not filler
    box.innerHTML = `<div class="ans-card ans-error"><h3>The explainer hit an error</h3><p>${esc(a.error)}</p></div>`;
    return;
  }
  // Narrator output is MODEL-GENERATED and reflects user questions (prompt
  // injection) -- always plain-text escaped, never inserted as HTML.
  box.innerHTML = `
    <div class="ans-card reveal">
      ${a.headline ? `<h3>${esc(a.headline)}</h3>` : ""}
      ${a.why ? `<p>${esc(a.why)}</p>` : ""}
      ${a.next_step ? `<div class="ans-next"><span class="ic" data-ic="arrow"></span><span>${esc(a.next_step)}</span></div>` : ""}
    </div>`;
  hydrate(box);
}

// On a ZeroGPU Space the JS client is REQUIRED (it forwards the HF iframe auth
// headers ZeroGPU needs). Locally / non-ZeroGPU we fall back to the raw
// two-step call so the chat still works with no internet to a CDN.
let _gradioClient = null;
async function getClient() {
  if (_gradioClient) return _gradioClient;
  const mod = await import("https://cdn.jsdelivr.net/npm/@gradio/client/dist/index.min.js");
  const Client = mod.Client || mod.client;
  _gradioClient = await Client.connect(window.location.origin);
  return _gradioClient;
}

async function callAsk(question, facts) {
  try {
    const client = await getClient();
    const r = await client.predict("/ask", { question, facts });
    return Array.isArray(r.data) ? r.data[0] : r.data;
  } catch (e) {
    return await callAskRaw(question, facts);
  }
}

async function callAskRaw(question, facts) {
  const post = await fetch("/gradio_api/call/ask", {
    method: "POST", headers: { "Content-Type": "application/json" },
    body: JSON.stringify({ data: [question, facts] }),
  });
  const { event_id } = await post.json();
  const res = await fetch(`/gradio_api/call/ask/${event_id}`);
  const text = await res.text();
  const lines = [...text.matchAll(/data:\s*(.+)/g)];   // SSE data frames
  if (!lines.length) throw new Error("no data in stream");
  const arr = JSON.parse(lines[lines.length - 1][1]);  // last frame = result
  return Array.isArray(arr) ? arr[0] : arr;
}

// ---- Init -----------------------------------------------------------------
function init() {
  hydrate(document);
  buildPicker();
  wireSegmented("#mode-seg", "mode", applyMode);
  wireSegmented("#computer-seg", "computer", () => { syncProviderForComputer(); $("#find-specs-body").innerHTML = findSpecsText(); });
  wireSegmented("#provider-seg", "provider", fillGpu);
  wireSegmented("#priority-seg", "priority");
  wireTaskToggle();
  ["#ram","#gpu","#vram","#repo-check"].forEach(s => { const el = $(s); if (el) el.addEventListener("change", maybeLiveUpdate); });
  $("#paste").addEventListener("input", maybeLiveUpdate);
  $("#check-btn").addEventListener("click", check);
  const pb = $("#parse-btn"); if (pb) pb.addEventListener("click", parsePaste);
  syncProviderForComputer();
  $("#find-specs-body").innerHTML = findSpecsText();
  // Pre-filled share/preview links: ?go renders immediately; optional
  // ?gpu=NVIDIA|RTX 3060 (12 GB)&ram=16&uc=chat pre-select a profile.
  const q = new URLSearchParams(location.search);
  if (q.has("gpu")) {
    const [vendor, label] = (q.get("gpu") || "").split("|");
    if (vendor) { state.provider = vendor.toLowerCase(); setActive("#provider-seg", state.provider); fillGpu(); }
    if (label) { const sel = $("#gpu"); [...sel.options].forEach(o => { if (o.value === label) sel.value = label; }); }
  }
  if (q.has("ram")) $("#ram").value = `${q.get("ram")} GB`;
  if (q.has("uc")) {
    state.usecases = [q.get("uc")];
    document.querySelectorAll(".uc-pill").forEach(p =>
      p.classList.toggle("active", p.dataset.uc === q.get("uc")));
  }
  if (q.has("go")) check();
}
// Run in the browser only; under Node (tests) we just expose the pure helpers.
if (typeof document !== "undefined") init();
if (typeof module !== "undefined" && module.exports) {
  module.exports = { esc, safeUrl, sanitizeHtml };
}