import PCSC, { Tag, Reader } from "@tockawa/nfc-pcsc";

export type NfcEvent =
    | { type: "tag"; uid: string }
    | { type: "removed"; uid: string }
    | { type: "error"; message: string };

export class NfcService {
    private nfc: PCSC;
    private onEvent?: (event: NfcEvent) => void;

    constructor(onEvent?: (event: NfcEvent) => void) {
        this.nfc = new PCSC.default();
        this.onEvent = onEvent;
        this.init();
    }

    private init(): void {
        this.nfc.on("reader", (reader: Reader) => {
            console.log(`Lector detectado: ${reader.name}`);

            reader.on("card", async (card: Tag) => {
                console.log(`Tarjeta detectada! UID: ${card.uid}`);
                if (this.onEvent) {
                    this.onEvent({ type: "tag", uid: card.uid });
                }
            });

            reader.on("card.off", async (card: Tag) => {
                console.log(`Tarjeta retirada: ${card.uid}`);
                if (this.onEvent) {
                    this.onEvent({ type: "removed", uid: card.uid });
                }
            });

            reader.on("error", (err: Error) => {
                console.error(`Error en el lector ${reader.name}:`, err);
                if (this.onEvent) {
                    this.onEvent({
                        type: "error",
                        message: err.message || String(err),
                    });
                }
            });

            reader.on("end", () => {
                console.log(`Lector desconectado: ${reader.name}`);
            });
        });

        this.nfc.on("error", (err: Error) => {
            console.error("Error general de NFC:", err);
            if (this.onEvent) {
                this.onEvent({
                    type: "error",
                    message: err.message || String(err),
                });
            }
        });
    }

    public stop(): void {
        // La mayoría de los lectores se cierran solos al cerrar la app
    }
}