// Status labels, pills, job names and due dates. Copy from the old build where it had one.
import type { PacketCard, PacketRead, PacketStatus, ProjectStatus, StageCounts } from "../api/types";

export const STATUS_LABEL: Record<PacketStatus, string> = {
  draft: "Ready to release",
  warehouse: "With warehouse",
  ready: "Ready to assign",
  assigned: "Sent to station",
  in_progress: "Working",
  review: "Supervisor review",
  qc: "Q.C. inspection",
  complete: "Routed",
  filed: "Filed in data book",
};

export function statusLabel(s: string): string {
  return (STATUS_LABEL as Record<string, string>)[s] ?? s;
}

/** The pill class for a status: "pill st-<status>". */
export function pillClass(s: string): string {
  return `pill st-${s}`;
}

export const SHOP: readonly PacketStatus[] = ["ready", "assigned", "in_progress", "review"];
export const IN_SHOP_OR_QC: readonly PacketStatus[] = [...SHOP, "qc"];

/** "L999001 · WELD-PART". */
export function jobName(p: Pick<PacketCard, "unit" | "op"> | Pick<PacketRead, "unit" | "op">): string {
  return p.op ? `${p.unit.number} · ${p.op}` : p.unit.number;
}

export const PROJECT_STATUS_LABEL: Record<ProjectStatus, string> = { open: "Open", hold: "On hold", closed: "Closed" };

/** The old projPill colours: open green, on hold pink, closed grey. */
export function projectPillClass(s: ProjectStatus): string {
  return `pill ${s === "open" ? "st-in_progress" : s === "hold" ? "st-review" : "st-filed"}`;
}

/** A flag text that names a hard problem shows in pink, the rest in amber. */
export function flagClass(flag: string): string {
  return /couldn't|not in|mismatch|No approved|Not released/i.test(flag) ? "due over" : "due soon";
}

const MONTHS = ["Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"];

/** The old dueInfo(): "Due Oct 20 '26 · 4 d left", with a class for colour. */
export function dueInfo(due: string | null | undefined, closed = false, today: Date = new Date()): { txt: string; cls: string } {
  if (!due) return { txt: "No due date", cls: "due muted" };
  const d = new Date(`${due.slice(0, 10)}T12:00:00`);
  if (Number.isNaN(d.getTime())) return { txt: `Due ${due}`, cls: "due" };
  const noon = new Date(today.getFullYear(), today.getMonth(), today.getDate(), 12);
  const days = Math.round((d.getTime() - noon.getTime()) / 86_400_000);
  const lab = `${MONTHS[d.getMonth()] ?? ""} ${d.getDate()} '${String(d.getFullYear()).slice(2)}`;
  if (closed) return { txt: `Due ${lab}`, cls: "due muted" };
  if (days < 0) return { txt: `Due ${lab} · ${-days} d overdue`, cls: "due over" };
  if (days <= 7) return { txt: `Due ${lab} · ${days === 0 ? "today" : `${days} d left`}`, cls: "due soon" };
  return { txt: `Due ${lab} · ${days} d left`, cls: "due" };
}

/** The open change orders on a card, as a count. */
export function openCoCount(p: Pick<PacketCard, "open_cos">): number {
  return Array.isArray(p.open_cos) ? p.open_cos.length : Number(p.open_cos) || 0;
}

/** Sum of the work orders' target hours. */
export function targetHours(p: Pick<PacketRead, "work_orders">): number {
  return p.work_orders.reduce((a, w) => a + (Number(w.target_hrs) || 0), 0);
}

/** "001" from "1", "7A" stays "7A". The server does the same. */
export function normLot(v: string): string {
  const t = v.trim().toUpperCase();
  return /^\d{1,3}$/.test(t) ? t.padStart(3, "0") : t;
}

export const RX_LOT = /^[A-Z0-9]{1,3}$/;
export const RX_PROJECT = /^[A-Z0-9][A-Z0-9-]{0,19}$/;

/** Lots counting up from a numeric start: ("008", 3) -> 008, 009, 010. Null when the start is not digits. */
export function lotSequence(start: string, count: number): string[] | null {
  const s = start.trim();
  if (!/^\d{1,3}$/.test(s) || !Number.isInteger(count) || count < 1) return null;
  const b = Number(s);
  if (b + count - 1 > 999) return null;
  return Array.from({ length: count }, (_, i) => String(b + i).padStart(3, "0"));
}

/** The next free numeric lot after the ones in use. */
export function nextLot(lots: readonly string[]): string {
  const nums = lots.filter((l) => /^\d+$/.test(l)).map(Number);
  const n = nums.length ? Math.max(...nums) + 1 : 1;
  return String(Math.min(n, 999)).padStart(3, "0");
}

/** Packet counts with every stage present. */
export function stageCounts(c: Partial<StageCounts> | undefined | null): StageCounts {
  return { draft: 0, warehouse: 0, shop: 0, qc: 0, complete: 0, filed: 0, total: 0, ...(c ?? {}) };
}

/** Counts of a list of cards, the same way. */
export function countCards(list: readonly Pick<PacketCard, "status">[]): StageCounts {
  const c = stageCounts(null);
  for (const p of list) {
    c.total++;
    if (p.status === "draft") c.draft++;
    else if (p.status === "warehouse") c.warehouse++;
    else if ((SHOP as readonly string[]).includes(p.status)) c.shop++;
    else if (p.status === "qc") c.qc++;
    else if (p.status === "complete") c.complete++;
    else if (p.status === "filed") c.filed++;
  }
  return c;
}