// Q.C. on the packet: the closed lists, NCR numbers and the texts the packet page builds. Pure functions.
import type { ItpHold, ItpHoldItem, PacketRead, QcHistoryRow, QcWeldExam } from "../api/types";
import { fmtTime } from "./format";

/** The NDE methods (the old NDE_METHODS). */
export const NDE_METHODS = ["None required", "RT", "UT", "MT", "PT"] as const;
export const NDE_NONE = "None required";

/** The NDE results. Empty means no result yet. */
export const NDE_RESULTS = ["", "Acceptable", "Rejectable"] as const;

/** Packet document kinds and their labels (the old PDOC_TYPES), in the old order. */
export const DOC_KINDS: ReadonlyArray<readonly [string, string]> = [
  ["nde", "NDE report (RT / UT / MT / PT)"],
  ["hydro", "Hydrotest report"],
  ["dimensional", "Dimensional report"],
  ["pmi", "PMI report"],
  ["coating", "Coating / paint report"],
  ["coc", "Certificate of conformance"],
  ["customer", "Customer inspection report"],
  ["ncr", "NCR"],
  ["other", "Other"],
];

/** The label of a document kind. An unknown kind shows as it is. */
export function docKindLabel(kind: string): string {
  return DOC_KINDS.find(([k]) => k === kind)?.[1] ?? kind;
}

/** The accept routes besides the shop departments. The en dash is the old text. */
export const ROUTE_DATABOOK = "Clerical – Data Book";
export const ROUTE_SHIPPING = "Shipping";

const RX_NCR = /^NCR-\d{4}-\d{4}$/;

/** "NCR-2026-0021" from " ncr-2026-0021 ". The server does the same. */
export function normNcr(text: string): string {
  return text.trim().toUpperCase();
}

/** A well-formed NCR number, after trimming and upper-casing. */
export function isNcr(text: string): boolean {
  return RX_NCR.test(normNcr(text));
}

/** The NCR's page in pesco-ncr. */
export function ncrUrl(ncr: string): string {
  return `https://ncr.pescoinc.biz/ncrs/${encodeURIComponent(normNcr(ncr))}`;
}

/** "W3" from 3. */
export function weldId(no: number | string): string {
  return `W${no}`;
}

/** The rejected welds of a visual exam, by weld number: [{id: "W1", note: "undercut"}, ...]. */
export function rejectedWelds(exam: Record<string, QcWeldExam> | null | undefined): Array<{ id: string; note: string | null }> {
  return Object.entries(exam ?? {})
    .filter(([, v]) => v?.result === "reject")
    .map(([k, v]) => ({ no: Number(k), id: weldId(k), note: v.note?.trim() || null }))
    .sort((a, b) => (Number.isFinite(a.no) && Number.isFinite(b.no) ? a.no - b.no : a.id.localeCompare(b.id)))
    .map(({ id, note }) => ({ id, note }));
}

/** "2 welds", "1 weld". */
export function plural(n: number, word: string): string {
  return `${n} ${word}${n === 1 ? "" : "s"}`;
}

/** The old itpHoldNote head: "ITP L073028-ITP: 2 open hold / witness points for this stage." */
export function holdText(hold: ItpHold): string {
  const n = hold.count;
  return `ITP ${hold.no ?? ""}: ${n} open hold / witness ${hold.rejected ? "or rejected " : ""}point${n === 1 ? "" : "s"}${hold.pages ? " for this stage" : ""}.`;
}

/** "4.2 Prior to vessel closing (H)" or "(rejected, NCR NCR-2026-0021)" or "(rejected, NCR pending)". */
export function holdItemText(i: ItpHoldItem): string {
  const why = i.rejected ? `rejected, NCR ${i.ncr || "pending"}` : i.codes.join(", ");
  return `${i.n} ${i.t} (${why})`;
}

/** The first four points joined by " · ", then "· and N more". */
export function holdItemsText(hold: ItpHold, show = 4): string {
  const head = hold.items.slice(0, show).map(holdItemText).join(" · ");
  const more = hold.items.length - show;
  return more > 0 ? `${head} · and ${more} more` : head;
}

/** A reject note without the NCR number in front: the server stores "NCR-2026-0021 · reason". */
export function noteWithoutNcr(note: string | null | undefined, ncr: string | null | undefined): string {
  const t = (note ?? "").trim();
  if (!ncr) return t;
  if (t === ncr) return "";
  const lead = `${ncr} · `;
  return t.startsWith(lead) ? t.slice(lead.length) : t;
}

/** "<time>: REJECTED by Quinn QC: note · NCR-2026-0021 · welds W1, W3". */
export function historyLine(h: QcHistoryRow): string {
  const who = h.inspector || h.by?.display_name || "";
  const parts = [noteWithoutNcr(h.note, h.ncr), h.ncr, h.rejected_welds?.length ? `welds ${h.rejected_welds.join(", ")}` : null].filter(
    (x): x is string => !!x,
  );
  return `${fmtTime(h.at)}: ${String(h.result ?? "").toUpperCase()}${who ? ` by ${who}` : ""}${parts.length ? `: ${parts.join(" · ")}` : ""}`;
}

const REJECTED_SHOWN_ON = new Set(["review", "assigned", "in_progress"]);

/** True when the packet shows the "Q.C. rejected" callout: back in the shop after a reject. */
export function showsQcRejected(p: PacketRead): boolean {
  return REJECTED_SHOWN_ON.has(p.status) && p.qc_last?.result === "rejected";
}