import {
  HCESessionEventListenerCancel,
  HCESession,
  NFCTagType4,
  NFCTagType4NDEFContentType,
} from "react-native-hce";
import { HceOptions, HceReadHandler } from "../types/HceTypes";

/**
 * Class which provides methods for emulating a Ndef card with your phone
 */
export default class HceTools {
  removeListener?: HCESessionEventListenerCancel;
  stopEmulation: () => Promise<void>;
  hceSession?: HCESession;

  constructor() {
    HCESession.getInstance().then((instance) => (this.hceSession = instance));
    this.stopEmulation = async () => {
      try {
        await this.hceSession?.setEnabled(false);
        this.removeListener && this.removeListener();
      } catch (err) {
        throw err;
      }
    };
  }

  async startEmulation(options: HceOptions, onRead: HceReadHandler) {
    const tag = new NFCTagType4({
      type: NFCTagType4NDEFContentType.Text,
      content: options.content,
      writable: options.writable,
    });

    try {
      this.hceSession = await HCESession.getInstance();
      this.hceSession.setApplication(tag);
      await this.hceSession.setEnabled(true);
      this.removeListener = this.hceSession.on(
        HCESession.Events.HCE_STATE_READ,
        () => {
          onRead();
          this.stopEmulation();
        }
      );
    } catch (err) {
      throw err;
    }
  }
}