// Shared number/date formatting for printed invoices.

/** `Rs. 12,450.00` — thousands separator, exactly 2 decimals. */
export const fmtMoney = (n: number) =>
  `Rs. ${n.toLocaleString('en-US', { minimumFractionDigits: 2, maximumFractionDigits: 2 })}`

/** Quantity: up to 3 decimals, trailing zeros dropped. */
export const fmtQty = (n: number) => n.toLocaleString('en-US', { maximumFractionDigits: 3 })

/** `dd/MM/yyyy` */
export function fmtDate(v: string | null | undefined) {
  if (!v) return '—'
  const d = new Date(v)
  const dd = String(d.getDate()).padStart(2, '0')
  const mm = String(d.getMonth() + 1).padStart(2, '0')
  return `${dd}/${mm}/${d.getFullYear()}`
}

export const invoiceNo = (id: string) => `INV-${id.substring(0, 8).toUpperCase()}`