/** How far a purchase order has been invoiced. Pure — client-safe. Shared by Purchases and Suppliers 2. */

/** Invoiced within this many rand of the PO total counts as fully invoiced (rounding). */
export const CLOSE_TOLERANCE = 1;

export type InvoiceStatus = "none" | "partial" | "complete" | "over";

/**
 * red = no invoice; amber = some invoiced but the money does not cover the PO (an invoice with
 * no amount typed in also lands here, since its value is unknown); teal = invoiced to within R1
 * of the PO total, so it can be closed; purple = invoiced MORE than the PO by over R1. That is
 * never "closed": it is a typo, a duplicate or a changed order, and a person has to look.
 */
export function invoiceStatusOf(total: number, amounts: (number | null)[]): { status: InvoiceStatus; invoiced: number } {
  const invoiced = amounts.reduce<number>((s, a) => s + (a ?? 0), 0);
  if (amounts.length === 0) return { status: "none", invoiced };
  if (invoiced - total > CLOSE_TOLERANCE) return { status: "over", invoiced };
  if (invoiced > 0 && total - invoiced <= CLOSE_TOLERANCE) return { status: "complete", invoiced };
  return { status: "partial", invoiced };
}

export const STATUS_STYLE: Record<InvoiceStatus, { color: string; label: string }> = {
  none: { color: "#D1495B", label: "No invoice yet" },
  partial: { color: "#EDAE49", label: "Partly invoiced" },
  complete: { color: "#00798C", label: "Fully invoiced — can be closed" },
  over: { color: "#8B5CF6", label: "Invoiced MORE than the PO — check" },
};