// Offer texts, status and display prices (brief §3, §5). Shared by the admin UI, the config compiler and
// the app proxy pages. Keep wording identical to the Odoo module.

export type BundleType = "fixed" | "mix" | "bxgy";
export type DiscountType = "percent" | "amount" | "fixed_price";
export type OfferStatus = "draft" | "scheduled" | "running" | "expired";

export interface OfferLike {
  type: BundleType | string;
  discountType: DiscountType | string;
  discountValue: number | string | { toString(): string };
  mixQty: number;
  buyQty: number;
  getQty: number;
  getPercent: number | string | { toString(): string };
  active: boolean;
  published: boolean;
  startsAt: Date | string | null;
  endsAt: Date | string | null;
}

export const num = (v: unknown) => Number(typeof v === "object" && v !== null ? v.toString() : v) || 0;

/** %g: no trailing zeros */
export function pct(v: unknown) {
  const n = num(v);
  return String(Number(n.toFixed(4)));
}

export type MoneyFormatter = (amount: number) => string;

export function moneyFormatter(currency: string, locale = "en"): MoneyFormatter {
  try {
    const f = new Intl.NumberFormat(locale, { style: "currency", currency });
    return (a) => f.format(a);
  } catch {
    return (a) => `${a.toFixed(2)} ${currency}`;
  }
}

/** Summary text (§5). */
export function offerSummary(o: OfferLike, money: MoneyFormatter): string {
  const v = num(o.discountValue);
  if (o.type === "bxgy") {
    const gp = num(o.getPercent);
    return gp >= 100
      ? `Buy ${o.buyQty}, get ${o.getQty} free`
      : `Buy ${o.buyQty}, get ${o.getQty} at ${pct(gp)}% off`;
  }
  if (o.type === "mix") {
    if (o.discountType === "fixed_price") return `Any ${o.mixQty} for ${money(v)}`;
    if (o.discountType === "amount") return `${money(v)} off any ${o.mixQty}`;
    return `${pct(v)}% off any ${o.mixQty}`;
  }
  if (o.discountType === "fixed_price") return `Bundle price ${money(v)}`;
  if (o.discountType === "amount") return `Save ${money(v)} on the bundle`;
  return `Save ${pct(v)}% on the bundle`;
}

const toDate = (d: Date | string | null) => (d ? new Date(d) : null);

/** draft if inactive or unpublished; expired if end < now; scheduled if start > now; else running. */
export function offerStatus(o: Pick<OfferLike, "active" | "published" | "startsAt" | "endsAt">, now = new Date()): OfferStatus {
  if (!o.active || !o.published) return "draft";
  const end = toDate(o.endsAt);
  const start = toDate(o.startsAt);
  if (end && end < now) return "expired";
  if (start && start > now) return "scheduled";
  return "running";
}

export const STATUS_LABEL: Record<OfferStatus, string> = {
  draft: "Draft",
  scheduled: "Scheduled",
  running: "Running",
  expired: "Ended",
};

export const STATUS_TONE: Record<OfferStatus, "neutral" | "info" | "success" | "warning"> = {
  draft: "neutral",
  scheduled: "info",
  running: "success",
  expired: "warning",
};

export const TYPE_LABEL: Record<string, string> = {
  fixed: "Fixed bundle",
  mix: "Mix & match",
  bxgy: "Buy X get Y",
};

/** Fixed bundle display prices (§5): saving and bundle price from the regular price. */
export function fixedBundlePrices(regular: number, discountType: string, value: number) {
  let saving = 0;
  if (discountType === "percent") saving = (regular * Math.min(value, 100)) / 100;
  else if (discountType === "amount") saving = Math.min(value, regular);
  else if (discountType === "fixed_price") saving = Math.max(regular - value, 0);
  saving = Math.max(saving, 0);
  return { regular, saving, bundle: regular - saving };
}

export function slugify(name: string) {
  return (
    name
      .normalize("NFKD")
      .replace(/[̀-ͯ]/g, "")
      .toLowerCase()
      .replace(/[^a-z0-9]+/g, "-")
      .replace(/^-+|-+$/g, "")
      .slice(0, 60) || "bundle"
  );
}