/** The cash-float card is a ledger: balance = opening + top-ups − slips. */
// Loose on purpose: PocketBase rows arrive as RecordModel, so only `kind` and `amount` are read.
export type CashEntry = { [k: string]: any };

export const sign = (kind: unknown) => (kind === "expense" ? -1 : 1);

export function cashBalance(entries: CashEntry[]): number {
  const cents = entries.reduce((s, e) => s + sign(e.kind) * Math.round(Number(e.amount || 0) * 100), 0);
  return cents / 100;
}

export const hasOpening = (entries: CashEntry[]) => entries.some((e) => e.kind === "opening");

export const MAX_AMOUNT = 1_000_000;

/** Parse a rand amount typed by a person ("1 250,50" / "1250.5"). null if it is not a positive number. */
export function parseAmount(raw: unknown, allowZero = false): number | null {
  const text = String(raw ?? "").replace(/\s/g, "").replace(",", ".");
  if (text === "") return null;
  const n = Number(text);
  if (!Number.isFinite(n) || n < 0 || (n === 0 && !allowZero) || n > MAX_AMOUNT) return null;
  return Math.round(n * 100) / 100;
}

export const rand = (n: number) =>
  `${n < 0 ? "-" : ""}R ${Math.abs(n).toLocaleString("en-ZA", { minimumFractionDigits: 2, maximumFractionDigits: 2 })}`;