crowd-funder-for-time-pwa/src/services/QRScanner/QRScannerFactory.ts

import { Capacitor } from "@capacitor/core";
import { QRScannerService } from "./types";
import { CapacitorQRScanner } from "./CapacitorQRScanner";
import { WebDialogQRScanner } from "./WebDialogQRScanner";
import { logger } from "@/utils/logger";

/**
 * Factory class for creating QR scanner instances based on platform
 */
export class QRScannerFactory {
  private static instance: QRScannerService | null = null;

  private static isNativePlatform(): boolean {
    const capacitorNative = Capacitor.isNativePlatform();
    const isMobile = __IS_MOBILE__;
    const platform = Capacitor.getPlatform();

    logger.log("Platform detection:", {
      capacitorNative,
      isMobile,
      platform,
      userAgent: navigator.userAgent,
    });

    // Force native scanner on Android/iOS
    if (platform === "android" || platform === "ios") {
      return true;
    }

    return capacitorNative || isMobile;
  }

  /**
   * Get a QR scanner instance appropriate for the current platform
   */
  static getInstance(): QRScannerService {
    if (!this.instance) {
      const isNative = this.isNativePlatform();
      logger.log(
        `Creating QR scanner for platform: ${isNative ? "native" : "web"}`,
      );

      if (isNative) {
        logger.log("Using native MLKit scanner");
        this.instance = new CapacitorQRScanner();
      } else if (__USE_QR_READER__) {
        logger.log("Using web QR scanner");
        this.instance = new WebDialogQRScanner();
      } else {
        throw new Error(
          "No QR scanner implementation available for this platform",
        );
      }
    }
    return this.instance!; // We know it's not null here
  }

  /**
   * Clean up the current scanner instance
   */
  static async cleanup(): Promise<void> {
    if (this.instance) {
      await this.instance.cleanup();
      this.instance = null;
    }
  }
}