import { getCompanySettings, type CompanySettings } from "./payload";
import {
  renderInvoicePdf,
  renderCorrectionInvoicePdf,
  type InvoiceOrder,
  type CorrectionInvoiceKind,
  type CorrectionInvoiceOrder,
} from "@einfach-produktiv/invoicing";

export type { CompanySettings };

// Fetched once by callers that need seller data for more than one purpose
// in the same request (e.g. orderEmail.ts also needs it for the email's
// legal footer, see buildLegalFooterLines() in emailTemplates.ts) — avoids
// a second identical company-settings round trip, unlike calling
// getCompanySettings() again inside each generator.
export async function getSellerForInvoice(): Promise<CompanySettings | null> {
  return getCompanySettings();
}

// Shared by app/lib/orderEmail.ts (checkout — attaches to the confirmation
// mail) and app/api/account/orders/[orderNumber]/invoice/route.ts (on-demand
// download) — same render call both times, so what a customer downloads
// later always matches what they were emailed. `seller` is passed in
// rather than fetched here, so a caller that already has it (see above)
// doesn't fetch it twice.
export async function generateInvoicePdf(order: InvoiceOrder, seller: CompanySettings | null): Promise<Buffer | null> {
  if (!seller) {
    console.error("generateInvoicePdf: no company-settings row found for tenant");
    return null;
  }
  return renderInvoicePdf(order, seller);
}

// Frontend-side regeneration for the "Stornorechnung/Gutschrift
// herunterladen" download button — the real document was already
// generated once (Payload's Orders.ts afterChange hook) and emailed; this
// reproduces the identical PDF from the order's own stored
// correctionInvoiceNumber/correctionInvoiceIssuedAt, same "deterministic
// regeneration, not file storage" approach as the original invoice.
export async function generateCorrectionInvoicePdf(
  kind: CorrectionInvoiceKind,
  order: CorrectionInvoiceOrder,
  seller: CompanySettings | null,
): Promise<Buffer | null> {
  if (!seller) {
    console.error("generateCorrectionInvoicePdf: no company-settings row found for tenant");
    return null;
  }
  return renderCorrectionInvoicePdf(kind, order, seller);
}