import { Capacitor } from '@capacitor/core'
import type { QRScannerService } from './types'
import { logger } from '../../utils/logger'
import { WebDialogQRScanner } from './WebDialogScanner'
import { CapacitorQRScanner } from './CapacitorScanner'

// Import platform-specific flags from Vite config
declare const __USE_QR_READER__: boolean
declare const __IS_MOBILE__: boolean

export class QRScannerFactory {
  private static instance: QRScannerService | null = null

  static getInstance(): QRScannerService {
    if (!this.instance) {
      // Use platform-specific flags for more accurate detection
      if (__IS_MOBILE__ || Capacitor.isNativePlatform()) {
        logger.log('Creating native QR scanner instance')
        this.instance = new CapacitorQRScanner()
      } else if (__USE_QR_READER__) {
        logger.log('Creating web QR scanner instance')
        this.instance = new WebDialogQRScanner()
      } else {
        throw new Error(
          'No QR scanner implementation available for this platform'
        )
      }
    }
    return this.instance
  }

  static async cleanup() {
    if (this.instance) {
      await this.instance.cleanup()
      this.instance = null
    }
  }
}