import { eq, siteConfig, type Db } from "@parking/db";
import {
  printWithFailover,
  registry,
  type PrinterDevice,
  type PrinterInstance,
  type TicketData,
  type TicketHeader,
} from "@parking/devices";
import type { FastifyBaseLogger } from "fastify";
import { devicesByDirection } from "./device-resolve.js";

// Booth-side printing for the EXIT VOUCHER ("biletë dalje"). When the booth is far
// from the exit, the customer pays at the booth and walks a printed voucher to the
// exit, where they self-scan it. The voucher reprints the SAME ticket id as a
// Code128 barcode (now a paid session) — so the exit reader runs the normal exit
// validation and opens. See wiki/concepts/booth-exit-flow.md, ticket-encoding.md.
//
// This mirrors the entry flow's printer selection + header build, but prints on the
// BOOTH printer (role "booth-receipt") since that's where the operator stands.

/** Park identity for the voucher header, from site_config (all fields optional). */
function ticketHeader(db: Db): TicketHeader | undefined {
  const row = db.select().from(siteConfig).where(eq(siteConfig.id, 1)).get();
  if (!row) return undefined;
  return {
    parkName: row.parkName,
    operatorName: row.operatorName,
    nius: row.nius,
    address: row.address,
    phone: row.phone,
  };
}

/** Build live printer instances for failover selection (entry direction covers the
 *  booth-receipt role too — the booth printer is configured on the entry side). */
function loadPrinters(db: Db): PrinterInstance[] {
  const rows = devicesByDirection(db, "printer", "entry");
  const out: PrinterInstance[] = [];
  for (const row of rows) {
    const driver = registry.get(row.driverId);
    if (!driver) continue;
    const cfg = row.config as Record<string, unknown>;
    const role = cfg.role === "booth-receipt" ? "booth-receipt" : "entry-dispenser";
    try {
      out.push({
        id: row.id,
        role,
        failoverRank: typeof cfg.failoverRank === "number" ? cfg.failoverRank : 0,
        device: driver.create(cfg as never) as PrinterDevice,
      });
    } catch {
      // skip a printer whose config won't build
    }
  }
  return out;
}

/**
 * Print an exit voucher for a paid session: the same ticket id reprinted as a
 * barcode, on the booth printer (failing over to the entry dispenser). Returns the
 * id of the printer that printed it. Throws NoPrinterAvailableError if none can.
 */
export async function printExitVoucher(
  db: Db,
  ticketId: string,
  logger: FastifyBaseLogger,
): Promise<string> {
  const printers = loadPrinters(db);
  const ticket: TicketData = {
    ticketId,
    issuedAt: new Date().toISOString(),
    header: ticketHeader(db),
  };
  // Prefer the booth printer (operator is at the booth); fall back to the dispenser.
  const printedBy = await printWithFailover(printers, "booth-receipt", (d: PrinterDevice) =>
    d.printTicket(ticket),
  );
  logger.info(`exit voucher for ${ticketId} printed on ${printedBy}`);
  return printedBy;
}

/**
 * Print a SUBSCRIPTION CARD on the booth printer (failing over to the dispenser):
 * a scannable QR of the credential code + holder/validity, so the operator can hand
 * it to the customer. Used on subscription creation and on a "reprint" action.
 * Returns the printer that printed it; throws NoPrinterAvailableError if none can.
 */
export async function printSubscriptionCard(
  db: Db,
  card: { code: string; holderName?: string | null; validFrom?: string | null; validTo?: string | null },
  logger: FastifyBaseLogger,
): Promise<string> {
  const printers = loadPrinters(db);
  const data = {
    code: card.code,
    holderName: card.holderName ?? null,
    validFrom: card.validFrom ?? null,
    validTo: card.validTo ?? null,
    header: ticketHeader(db),
  };
  const printedBy = await printWithFailover(printers, "booth-receipt", (d: PrinterDevice) =>
    d.printSubscriptionCard(data),
  );
  logger.info(`subscription card ${card.code} printed on ${printedBy}`);
  return printedBy;
}