import { useCallback, useEffect, useRef, useState, type FormEvent } from "react";
import { Link, useLocation, useNavigate, useParams, useSearchParams } from "react-router";
import { assetsApi } from "../api/assets";
import { ApiError, errorCode } from "../api/client";
import { packetsApi } from "../api/packets";
import type { PacketHeader, PacketRead, TransitionBody } from "../api/types";
import { homePath } from "../auth/roles";
import { useAuth } from "../auth/useAuth";
import { presenceText, usePacketPresence } from "../auth/useEvents";
import { useGuard } from "../components/useGuard";
import { useChanged } from "../lib/changes";
import { errorText } from "../lib/format";
import { dueInfo, flagClass, jobName, pillClass, statusLabel, targetHours } from "../lib/packets";
import { Act } from "./Act";
import { CloseFile } from "./CloseFile";
import { DrawingViewer } from "./DrawingViewer";
import { openPrint } from "./closeUtil";
import { PrintMenu } from "./PrintMenu";
import { MoveSheet, SendToDeptSheet } from "./sheets";
import { DocumentsTab, HistoryTab, MaterialsTab, WorkOrdersTab, type Mutate } from "./tabs";
import { coSummary, coToReview } from "../lib/changeOrders";
import { VisualBox } from "./visual";
import { ChangesTab } from "./ChangesTab";
import { ChecklistTab } from "./ChecklistTab";
import { HeatMapTab } from "./HeatMapTab";
import { ShopBar } from "./ShopActions";
import { HoldCallout } from "./HoldCallout";
import { QcBar } from "./QcActions";
import { QcRejectedCallout } from "./QcRejectedCallout";
import { showsQcRejected } from "../lib/qc";
import { QcTab } from "./QcTab";
import { WeldMapTab } from "./WeldMapTab";
import type { Write } from "../warehouse/PullTable";
import { packetMessage, pillClassFor, WH_STAGES, pillText, progress, whLine, whStage } from "../warehouse/stages";
import { useWhMove } from "../warehouse/useWhMove";

type Tab = "drawing" | "heat" | "materials" | "checklist" | "welds" | "qc" | "workorders" | "changes" | "docs" | "history";
const TABS: readonly Tab[] = ["drawing", "materials", "heat", "checklist", "welds", "qc", "workorders", "changes", "docs", "history"];
function isTab(v: string | null): v is Tab {
  return v !== null && (TABS as readonly string[]).includes(v);
}

const TOAST_MS = 5000;

/** The rule's signature meaning for attaching a drawing by hand. */
const SIGN_ATTACH = "Attach a drawing by hand";

/** Title, customer, WPS, drawing and rev, edited in place with a field-level base. */
function HeaderEdit({ p, mutate, busy, onDone }: { p: PacketRead; mutate: Mutate; busy: boolean; onDone: () => void }) {
  const head = p.can.includes("edit_header");
  const dwg = p.can.includes("edit_drawing_ref");
  const [v, setV] = useState({ title: p.title ?? "", customer: p.customer ?? "", wps: p.wps ?? "", drawing: p.drawing ?? "", rev: p.rev ?? "" });
  const field = (k: keyof typeof v, label: string, max: number, on: boolean) =>
    on ? (
      <label className="f">
        {label}
        <input className="in" value={v[k]} maxLength={max} onChange={(e) => setV((o) => ({ ...o, [k]: e.target.value }))} />
      </label>
    ) : null;

  const save = async (e: FormEvent) => {
    e.preventDefault();
    const set: Partial<PacketHeader> = {};
    const base: Partial<PacketHeader> = {};
    for (const k of Object.keys(v) as Array<keyof typeof v>) {
      const now = v[k].trim() || null;
      const was = p[k] ?? null;
      if (now !== was) {
        set[k] = now;
        base[k] = was;
      }
    }
    if (Object.keys(set).length === 0) {
      onDone();
      return;
    }
    if (await mutate((g) => packetsApi.patch(p.id, { set, base, ...g }), { ok: "Saved" })) onDone();
  };

  return (
    <form className="panel stack" onSubmit={save} noValidate aria-label="Edit details">
      <div className="frow">
        {field("title", "Title", 200, head)}
        {field("customer", "Customer", 120, head)}
        {field("wps", "WPS", 40, head)}
        {field("drawing", "Drawing no.", 60, dwg)}
        {field("rev", "Rev", 10, dwg)}
      </div>
      <div className="sheet-acts start">
        <button className="btn pri" type="submit" disabled={busy}>
          Save
        </button>
        <button className="btn ghost" type="button" onClick={onDone}>
          Cancel
        </button>
      </div>
    </form>
  );
}

/** /packets/:id: the packet for every signed-in role. Controls come from `can` and `blocked`. */
export function PacketPage() {
  const params = useParams();
  const id = Number(params.id);
  const navigate = useNavigate();
  const { me } = useAuth();
  const { run, askReason, sheet: guardSheet } = useGuard();
  const [packet, setPacket] = useState<PacketRead | null>(null);
  const [loadError, setLoadError] = useState<string | null>(null);
  const [msg, setMsg] = useState<{ ok: boolean; text: string } | null>(null);
  const [busy, setBusy] = useState(false);
  const [search] = useSearchParams();
  const wantTab = search.get("tab");
  const [tab, setTab] = useState<Tab | null>(isTab(wantTab) ? wantTab : null);
  const [sheet, setSheet] = useState<"dept" | "move" | "print" | null>(null);
  const [editing, setEditing] = useState(false);
  const [toast, setToast] = useState<string | null>(null);
  const others = usePacketPresence(Number.isFinite(id) ? id : null);
  // Phase 8: Back is one step back in this app's history (to the same scroll spot); a packet opened straight
  // from a link has no app entry before it ("default"), so Back goes to the screen home.
  const location = useLocation();
  const hasAppHistory = location.key !== "default";
  const versionRef = useRef<number | null>(null);
  const fileRef = useRef<HTMLInputElement>(null);

  // A read that was sent before a write committed can answer after the write's own answer: never go back.
  const take = useCallback((p: PacketRead) => setPacket((cur) => (cur && cur.id === p.id && cur.version > p.version ? cur : p)), []);

  const reload = useCallback(async () => {
    try {
      const p = await packetsApi.get(id);
      take(p);
      setLoadError(null);
    } catch (err) {
      setLoadError(errorText(err));
    }
  }, [id, take]);

  useEffect(() => {
    setPacket(null);
    setTab(isTab(wantTab) ? wantTab : null);
    void reload();
  }, [reload, wantTab]);

  useEffect(() => {
    versionRef.current = packet?.version ?? null;
  }, [packet]);

  useEffect(() => {
    if (!toast) return;
    const t = window.setTimeout(() => setToast(null), TOAST_MS);
    return () => window.clearTimeout(t);
  }, [toast]);

  // Live refresh: another screen changed this packet.
  useChanged(() => void reload(), {
    delayMs: 500,
    filter: (ev) => Number(ev.packet_id) === id && (ev.version === undefined || ev.version !== versionRef.current),
  });

  const job = packet ? jobName(packet) : "";

  // Line writes: the answer replaces the packet; the error goes back to the row that made it.
  const write: Write = useCallback(
    async (fn) => {
      try {
        const r = await run(fn, { sub: job });
        if (r === undefined) return { ok: false };
        if (r && typeof r === "object" && "id" in r) take(r as PacketRead);
        else await reload();
        return { ok: true };
      } catch (err) {
        return { ok: false, err };
      }
    },
    [run, reload, job, take],
  );

  const wh = useWhMove({
    run,
    onDone: setPacket,
    onError: (err) => {
      if (err instanceof ApiError && err.status === 409) void reload();
      setMsg({ ok: false, text: errorText(err) });
    },
  });

  const mutate: Mutate = useCallback(
    async (fn, opts = {}) => {
      setBusy(true);
      setMsg(null);
      try {
        const r = await run(fn, { sign: opts.sign, sub: job });
        if (r === undefined) return false;
        if (r && typeof r === "object" && "id" in r) take(r as PacketRead);
        else await reload();
        if (opts.ok) setMsg({ ok: true, text: opts.ok });
        return true;
      } catch (err) {
        // stale_step, field_conflict, row_conflict: someone else moved first. Show their state.
        if (err instanceof ApiError && (err.status === 409 || err.status === 412)) await reload();
        // A step someone else already took: the page shows their state and says so once, as a toast.
        if (errorCode(err) === "stale_step") setToast(errorText(err));
        else setMsg({ ok: false, text: errorText(err) });
        return false;
      } finally {
        setBusy(false);
      }
    },
    [run, reload, job, take],
  );

  if (!packet) {
    return loadError ? <div className="callout warn">{loadError}</div> : <div className="empty slim">Loading</div>;
  }

  const p = packet;
  const can = (a: string) => p.can.includes(a);
  const draft = p.status === "draft";
  const transition = (action: string, extra: Omit<TransitionBody, "action" | "expect"> = {}, ok?: string) =>
    mutate((g) => packetsApi.transition(p.id, { action, expect: { status: p.status, dept: p.dept.code }, ...extra, ...g }), { ok });

  const setHeatMap = (v: boolean) =>
    mutate((g) => packetsApi.patch(p.id, { set: { heat_map: v }, base: { heat_map: p.heat_map }, ...g }));

  const attach = async (file: File) => {
    setBusy(true);
    setMsg(null);
    let asset;
    try {
      asset = await assetsApi.upload(file, { packet_id: p.id, purpose: "drawing" });
    } catch (err) {
      setMsg({ ok: false, text: errorText(err) });
      setBusy(false);
      return;
    } finally {
      if (fileRef.current) fileRef.current.value = "";
    }
    setBusy(false);
    if (asset.mime !== "application/pdf") {
      setMsg({ ok: false, text: "The drawing must be a PDF." });
      return;
    }
    const pages = asset.pages ?? 0;
    await mutate(
      (g) =>
        packetsApi.attachPages(p.id, {
          asset_id: asset.id,
          type: "drawing",
          ...(p.drawing ? { dwg: p.drawing } : {}),
          ...(p.rev ? { rev: p.rev } : {}),
          ...g,
        }),
      { sign: SIGN_ATTACH, ok: pages ? `Drawing attached (${pages} page${pages === 1 ? "" : "s"}).` : "Drawing attached." },
    );
  };

  const sendToQc = async () => {
    const note = await askReason({
      title: "Send straight to Q.C.",
      sub: job,
      label: "Note (optional, Q.C. will see it)",
      note: "Skips the warehouse and the shop. Q.C. gets it for inspection.",
      min: 0,
      submitLabel: "Send to Q.C.",
    });
    if (note === null) return;
    await transition("send_draft_to_qc", note ? { note } : {}, "Sent to Q.C.");
  };

  const remove = async () => {
    const reason = await askReason({
      title: "Remove packet",
      sub: job,
      note: "The packet leaves every board. It stays in the record with your reason.",
      min: 8,
      danger: true,
      submitLabel: "Remove packet",
    });
    if (reason === null) return;
    setBusy(true);
    setMsg(null);
    try {
      const r = await run((g) => packetsApi.remove(p.id, { reason, ...g }), { sub: job });
      if (r !== undefined) navigate(`/clerical/units/${p.unit.id}`);
    } catch (err) {
      if (err instanceof ApiError && err.status === 409) await reload();
      setMsg({ ok: false, text: errorText(err) });
    } finally {
      setBusy(false);
    }
  };

  const removeDrawing = async (n: number) => {
    await mutate((g) => packetsApi.removePages(p.id, n, g), { ok: "Drawing removed." });
  };

  const drawingPages = p.pages.filter((x) => x.type === "drawing");
  const review = coToReview(p);
  const hasQc = !!p.qc || p.qc_history.length > 0;
  const hidden = (tab === "changes" && !(p.change_orders ?? []).length) || (tab === "qc" && !hasQc);
  const shownTab: Tab = hidden ? "materials" : (tab ?? (drawingPages.length ? "drawing" : "materials"));
  // The warehouse short-parts exception and the data book date are not edits of the packet itself.
  const passive = new Set(["wh_receive_short", "set_databook_at"]);
  const viewOnly =
    p.can.every((a) => passive.has(a)) && Object.keys(p.blocked).every((a) => passive.has(a));
  const project = p.unit.project;
  const di = dueInfo(p.unit.due_effective, project.status === "closed");
  const target = targetHours(p);
  const lotQty = Math.max(0, ...p.work_orders.map((w) => Number(w.qty) || 0));
  const backTo = me?.screens.includes("clerical") ? `/clerical/units/${p.unit.id}` : homePath(me?.screens ?? []);
  const atWh = p.status === "warehouse";
  const whCan = atWh && can("set_wh_stage");
  const stage = whStage(p);
  const whMsg = whCan ? packetMessage(p) : null;
  const whTarget = { id: p.id, stage, job, progress: progress(p) };
  const sendBack = async () => {
    const reason = await askReason({
      title: "Send back to Clerical",
      sub: job,
      note: "The packet goes back to Clerical as a draft. Say what needs fixing.",
      min: 8,
      submitLabel: "Send back to Clerical",
    });
    if (reason === null) return;
    await transition("wh_send_back", { reason }, "Sent back to Clerical.");
  };
  const hasDraftControls =
    draft && ["edit_header", "send_to_warehouse", "release_to_shop", "send_draft_to_qc", "edit_document_set", "move_unit", "remove"].some((a) => can(a) || p.blocked[a]);

  const cos = (p.change_orders ?? []).length;
  const ckOpen = p.checklist_items.filter((i) => !p.stage?.checklist?.[i.key]?.done).length;
  const tabs: Array<{ id: Tab; label: string; count?: number }> = [
    { id: "drawing", label: "Drawing", count: drawingPages.length },
    { id: "materials", label: "Materials", count: p.bom.length },
    { id: "heat", label: "Heat map" },
    { id: "checklist", label: "Checklist", ...(p.stage ? { count: ckOpen } : {}) },
    { id: "welds", label: "Weld map", count: p.welds.length },
    ...(hasQc ? [{ id: "qc" as const, label: "Q.C." }] : []),
    { id: "workorders", label: "Work orders", count: p.work_orders.length },
    ...(cos ? [{ id: "changes" as const, label: "Changes", count: cos }] : []),
    { id: "docs", label: "Documents", count: p.docs.filter((d) => !d.removed).length },
    { id: "history", label: "History" },
  ];
  const onTabError = (text: string) => setMsg({ ok: false, text });

  return (
    <>
      <Link
        className="back"
        to={backTo}
        onClick={(e) => {
          if (!hasAppHistory || e.metaKey || e.ctrlKey || e.shiftKey || e.button !== 0) return;
          e.preventDefault();
          navigate(-1);
        }}
      >
        ← Back
      </Link>
      <div className="dhead">
        <div className="grow0">
          <div className="eyebrow">
            {p.op ?? ""} · {statusLabel(p.status)}
          </div>
          <h1>{job}</h1>
          {p.title ? <div className="dtitle">{p.title}</div> : null}
          <div className="small crumbs2">
            Project <b>{project.number}</b> {project.name ?? ""} <span className="muted">›</span> Unit <b>{p.unit.number}</b> {p.unit.name ?? ""}
            {project.po ? (
              <>
                {" "}
                · PO <span className="mono">{project.po}</span>
              </>
            ) : null}{" "}
            · <span className={di.cls}>{di.txt}</span>
          </div>
          <div className="facts">
            {lotQty ? (
              <div>
                <span>Lot qty </span>
                <b>{lotQty}</b>
              </div>
            ) : null}
            <div>
              <span>Customer </span>
              <b>{p.customer || "-"}</b>
            </div>
            <div>
              <span>Drawing </span>
              <b>{p.drawing ? `${p.drawing} R${p.rev || "-"}` : "-"}</b>
            </div>
            <div>
              <span>WPS </span>
              <b>{p.wps || "-"}</b>
            </div>
            <div>
              <span>Department </span>
              <b>
                {p.dept.code} {p.dept.name}
              </b>
            </div>
            <div>
              <span>Target </span>
              <b>{target.toFixed(1)} h</b>
            </div>
            <div>
              <span>Heat map </span>
              <b>{p.heat_map === true ? "Yes" : p.heat_map === false ? "Not required" : "Not answered"}</b>
            </div>
            {p.for_sup ? (
              <div>
                <span>For </span>
                <b>{p.for_sup.display_name}</b>
              </div>
            ) : null}
            {p.station ? (
              <div>
                <span>Station </span>
                <b>{p.station.name}</b>
              </div>
            ) : null}
            {p.welder ? (
              <div>
                <span>Welder </span>
                <b>
                  {p.welder.display_name}
                  {p.welder.stamp ? ` [${p.welder.stamp}]` : ""}
                </b>
              </div>
            ) : null}
          </div>
        </div>
        <div className="pacts">
          <span className={pillClass(p.status)} data-testid="status-pill">
            {statusLabel(p.status)}
          </span>
          {can("edit_header") || can("edit_drawing_ref") ? (
            <button className="btn sm" type="button" onClick={() => setEditing((e) => !e)} aria-expanded={editing}>
              Edit details
            </button>
          ) : null}
          {can("move_unit") ? (
            <button className="btn sm" type="button" disabled={busy} onClick={() => setSheet("move")}>
              Move
            </button>
          ) : null}
          {!p.removed ? (
            <button className="btn sm" type="button" onClick={() => setSheet("print")}>
              Print…
            </button>
          ) : null}
        </div>
      </div>

      {p.flag ? <div className={`small flagline ${flagClass(p.flag)}`}>⚑ {p.flag}</div> : null}
      {p.removed ? (
        <div className="callout warn">
          <b>Removed</b>
          {p.removed.by ? ` by ${p.removed.by.display_name}` : ""}. {p.removed.reason ?? ""}
        </div>
      ) : null}
      <QcRejectedCallout p={p} />
      {p.return_note && !(showsQcRejected(p) && p.return_note === p.qc_last?.note) ? (
        <div className="callout warn">
          <b>Returned:</b> {p.return_note}
        </div>
      ) : null}
      {viewOnly && !p.removed ? (
        <div className="viewonly">
          <span aria-hidden="true">●</span>
          <div>
            <b>View only.</b> This packet is with <b>{p.holder}</b>. You can follow its progress. Changes open up only when it is sent to you or sent back.
          </div>
        </div>
      ) : null}
      {others.length ? (
        <div className="presence small" data-testid="presence" role="status">
          <span className="pdot" aria-hidden="true" />
          {presenceText(others)}
        </div>
      ) : null}
      {msg ? (
        <div className={msg.ok ? "callout" : "callout warn"} role={msg.ok ? "status" : "alert"}>
          {msg.text}
        </div>
      ) : null}

      {review && (me?.roles ?? []).some((r) => r === "clerical" || r === "clerical_supervisor" || r === "admin") ? (
        <div className="callout warn" role="status">
          <b>Change order CO-{review.co_no}: a change from VISUAL is waiting for your approval</b> - {coSummary(review)}. Nothing has gone to the shop packet yet.
          {review.hold ? <b> Shop packet on hold.</b> : null}{" "}
          <button className="btn sm pri" type="button" onClick={() => setTab("changes")}>
            Review change
          </button>
        </div>
      ) : null}

      <VisualBox p={p} roles={me?.roles ?? []} sub={job} mutate={mutate} busy={busy} askReason={askReason} onError={(text) => setMsg({ ok: false, text })} />

      {editing ? <HeaderEdit key={p.version} p={p} mutate={mutate} busy={busy} onDone={() => setEditing(false)} /> : null}

      {hasDraftControls ? (
        <section className="panel actbox" aria-label="Draft steps">
          <div>
            <b>Ready to release.</b> Check the BOM and work orders, attach the drawing, and say whether it needs a heat map. Then send it to the warehouse for the
            parts pull, or straight to a department or Q.C.
          </div>
          {can("edit_header") ? (
            <div className="hmq" role="group" aria-label="Heat map required?">
              <b>Heat map required?</b>
              <button type="button" className="chip sm" aria-pressed={p.heat_map === true} disabled={busy} onClick={() => void setHeatMap(true)}>
                Yes
              </button>
              <button type="button" className="chip sm" aria-pressed={p.heat_map === false} disabled={busy} onClick={() => void setHeatMap(false)}>
                No
              </button>
              {p.heat_map === null ? <span className="due soon small">choose before sending</span> : null}
            </div>
          ) : null}
          <div className="acts">
            {can("edit_document_set") ? (
              <div className="act">
                <label className={busy ? "btn dim" : "btn"}>
                  {drawingPages.length ? "Attach another drawing" : "Attach drawing"}
                  <input
                    ref={fileRef}
                    className="sr"
                    type="file"
                    accept="application/pdf"
                    aria-label="Attach drawing (PDF)"
                    disabled={busy}
                    onChange={(e) => {
                      const f = e.target.files?.[0];
                      if (f) void attach(f);
                    }}
                  />
                </label>
              </div>
            ) : null}
            <Act p={p} action="send_to_warehouse" busy={busy} className="btn pri" onClick={() => void transition("send_to_warehouse", {}, "Sent to the warehouse.")}>
              Send to warehouse
            </Act>
            <Act p={p} action="release_to_shop" busy={busy} onClick={() => setSheet("dept")}>
              Send to a department
            </Act>
            <Act p={p} action="send_draft_to_qc" busy={busy} onClick={() => void sendToQc()}>
              Send to Q.C.
            </Act>
            <Act p={p} action="remove" busy={busy} className="btn rejb" onClick={() => void remove()}>
              Remove
            </Act>
          </div>
        </section>
      ) : null}

      {atWh ? (
        <section className={whCan ? "panel actbox" : "callout"} aria-label="Warehouse">
          <div className="whstep">
            <span className={pillClassFor(stage)}>{pillText(stage)}</span>
            <div className={`whline ${WH_STAGES[stage].cls}`}>{whLine(p)}</div>
          </div>
          {whMsg ? (
            <div>
              <b>{whMsg.head}</b> {whMsg.rest}
            </div>
          ) : null}
          {whCan || can("wh_send_back") || can("wh_release") || p.blocked.wh_release ? (
            <div className="acts">
              <Act p={p} action="wh_send_back" busy={busy} className="btn ghost" onClick={() => void sendBack()}>
                Send back to Clerical
              </Act>
              {whCan && stage === "incoming" ? (
                <div className="act">
                  <button className="btn" type="button" disabled={busy || wh.busy} onClick={() => wh.move(whTarget, "pulling")}>
                    Start pulling
                  </button>
                </div>
              ) : null}
              {whCan && stage === "hold" ? (
                <div className="act">
                  <button className="btn" type="button" disabled={busy || wh.busy} onClick={() => wh.move(whTarget, "pulling")}>
                    Resume pulling
                  </button>
                </div>
              ) : null}
              {whCan && stage === "pulling" ? (
                <div className="act">
                  <button className="btn" type="button" disabled={busy || wh.busy} onClick={() => wh.move(whTarget, "pulled")}>
                    Mark pulled
                  </button>
                </div>
              ) : null}
              {whCan && stage === "pulled" ? (
                <div className="act">
                  <button className="btn" type="button" disabled={busy || wh.busy} onClick={() => wh.move(whTarget, "pulling")}>
                    Back to pulling
                  </button>
                </div>
              ) : null}
              {whCan && (stage === "incoming" || stage === "pulling") ? (
                <div className="act">
                  <button className="btn" type="button" disabled={busy || wh.busy} onClick={() => wh.move(whTarget, "hold")}>
                    Hold
                  </button>
                </div>
              ) : null}
              <Act
                p={p}
                action="wh_release"
                busy={busy || wh.busy}
                className="btn pri"
                onClick={() => void transition("wh_release", {}, "Released to supervisor.")}
              >
                Release to supervisor{p.open_shorts ? ` (${p.open_shorts} short)` : ""}
              </Act>
            </div>
          ) : null}
        </section>
      ) : null}

      <CloseFile p={p} busy={busy} mutate={mutate} askReason={askReason} sub={job} onPrint={() => setSheet("print")} />

      <ShopBar p={p} busy={busy} mutate={mutate} askReason={askReason} sub={job} goTab={(t) => setTab(t)} />
      <QcBar p={p} busy={busy} mutate={mutate} sub={job} goQc={() => setTab("qc")} />
      <HoldCallout p={p} qcScreen={me?.screens.includes("qc") ?? false} />

      <div className="tabs" role="tablist" aria-label="Packet">
        {tabs.map((t) => (
          <button
            key={t.id}
            type="button"
            role="tab"
            id={`ptab-${t.id}`}
            aria-selected={shownTab === t.id}
            aria-controls={`ppanel-${t.id}`}
            onClick={() => setTab(t.id)}
          >
            {t.label}
            {t.count !== undefined ? <span className="cnt">{t.count}</span> : null}
          </button>
        ))}
      </div>
      <div key={shownTab} className="m-tab" role="tabpanel" id={`ppanel-${shownTab}`} aria-labelledby={`ptab-${shownTab}`}>
        {shownTab === "drawing" ? (
          <div className="stack">
            {draft && can("edit_document_set") && drawingPages.length ? (
              <div className="sec-h flush">
                <span className="small muted">
                  {drawingPages.length} drawing page{drawingPages.length === 1 ? "" : "s"} attached by hand.
                </span>
                <span className="grow" />
                <button className="btn sm ghost" type="button" disabled={busy} onClick={() => void removeDrawing(drawingPages[0]?.n ?? 1)}>
                  Remove drawing
                </button>
              </div>
            ) : null}
            <DrawingViewer pages={drawingPages} {...(p.removed ? {} : { onPrintSheet: (n: number) => openPrint(p.id, "clean", { sheet: n }) })} />
          </div>
        ) : null}
        {shownTab === "heat" ? <HeatMapTab key={p.id} p={p} write={write} reload={reload} sub={job} onError={onTabError} /> : null}
        {shownTab === "materials" ? <MaterialsTab p={p} mutate={mutate} busy={busy} write={write} reload={reload} /> : null}
        {shownTab === "checklist" ? <ChecklistTab p={p} write={write} mutate={mutate} reload={reload} onError={onTabError} /> : null}
        {shownTab === "welds" ? (
          <WeldMapTab key={p.id} p={p} write={write} mutate={mutate} reload={reload} askReason={askReason} sub={job} myId={me?.user.id ?? null} onError={onTabError} />
        ) : null}
        {shownTab === "qc" ? <QcTab p={p} write={write} mutate={mutate} reload={reload} onError={onTabError} /> : null}
        {shownTab === "workorders" ? <WorkOrdersTab p={p} /> : null}
        {shownTab === "changes" ? <ChangesTab p={p} roles={me?.roles ?? []} sub={job} mutate={mutate} busy={busy} askReason={askReason} /> : null}
        {shownTab === "docs" ? <DocumentsTab p={p} mutate={mutate} busy={busy} write={write} askReason={askReason} sub={job} /> : null}
        {shownTab === "history" ? <HistoryTab p={p} /> : null}
      </div>

      {sheet === "dept" ? (
        <SendToDeptSheet
          p={p}
          sub={job}
          onCancel={() => setSheet(null)}
          onSend={(dept, note) => {
            setSheet(null);
            void transition("release_to_shop", { dept, ...(note ? { note } : {}) }, "Sent to the department.");
          }}
        />
      ) : null}
      {sheet === "move" ? (
        <MoveSheet
          p={p}
          sub={job}
          onCancel={() => setSheet(null)}
          onMove={(unitId, reason) => {
            setSheet(null);
            void mutate((g) => packetsApi.move(p.id, { unit_id: unitId, ...(reason ? { reason } : {}), ...g }), { ok: "Packet moved." });
          }}
        />
      ) : null}
      {sheet === "print" ? <PrintMenu p={p} sub={job} onClose={() => setSheet(null)} /> : null}
      {wh.sheet}
      {guardSheet}
      {toast ? (
        <div className="toast" role="status" data-testid="toast">
          {toast}
        </div>
      ) : null}
    </>
  );
}