dependencies {
    implementation("com.braintreepayments.api:local-payment:5.8.0")
}

class LocalPaymentActivity : AppCompatActivity() {
    private lateinit var localPaymentClient: LocalPaymentClient
    private lateinit var localPaymentLauncher: LocalPaymentLauncher

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)

        // must be initialized on onCreate()
        localPaymentLauncher = LocalPaymentLauncher()

        // can be initialized outside onCreate() if desired
        localPaymentClient = LocalPaymentClient(
            context = requireContext(),
            authorization = "TOKENIZATION_KEY or CLIENT_TOKEN",
            appLinkReturnUrl = Uri.parse("https://merchant-app.com") // Merchant App Link
        )
    }

    // ONLY REQUIRED IF YOUR ACTIVITY LAUNCH MODE IS SINGLE_TOP
    override fun onNewIntent(intent: Intent) {
        super.onNewIntent(intent)
        handleReturnToApp(intent)
    }

    // ALL OTHER ACTIVITY LAUNCH MODES
    override fun onResume() {
        super.onResume()
        handleReturnToApp(intent)
    }

    private fun handleReturnToApp(intent: Intent) {
        // fetch stored pendingRequest
        val pendingRequest: LocalPaymentPendingRequest.Started = fetchStoredPendingRequest()
        pendingRequest?.let {
            val paymentAuthResult: LocalPaymentAuthResult =
                localPaymentLauncher.handleReturnToApp(
                    pendingRequest = it,
                    intent = intent
                )
            if (paymentAuthResult is LocalPaymentAuthResult.Success) {
                localPaymentClient.tokenize(
                    context = requireContext(),
                    localPaymentAuthResult = paymentAuthResult
                ) { localPaymentResult: LocalPaymentResult? ->
                    localPaymentResult?.let {
                        this.handleLocalPaymentResult(it)
                    }
                }
            } else {
                // handle error - User did not complete local payment flow
            }
            // clear pendingRequest
        }
    }

    fun startLocalPayment() {
        val request: LocalPaymentRequest = localPaymentRequest

        localPaymentClient.createPaymentAuthRequest(
            request = request
        ) { paymentAuthRequest: LocalPaymentAuthRequest ->
            if (paymentAuthRequest is LocalPaymentAuthRequest.ReadyToLaunch) {
                val pendingRequest = localPaymentLauncher.launch(
                    activity = requireActivity(),
                    localPaymentAuthRequest = paymentAuthRequest
                )
                if (pendingRequest is LocalPaymentPendingRequest.Started) {
                    // store pendingRequest for future use
                } else if (pendingRequest is LocalPaymentPendingRequest.Failure) {
                    // handleError - pendingRequest.error
                }
            } else if (paymentAuthRequest is LocalPaymentAuthRequest.Failure) {
                // handleError - paymentAuthRequest.error
            }
        }
    }

    protected fun handleLocalPaymentResult(localPaymentResult: LocalPaymentResult) {
        when (localPaymentResult) {
            is LocalPaymentResult.Success -> { /* handle localPaymentResult.nonce */ }
            is LocalPaymentResult.Failure -> { /* handle localPaymentResult.error */ }
            is LocalPaymentResult.Cancel -> { /* handle user canceled */ }
        }
    }

    companion object {
        private val localPaymentRequest: LocalPaymentRequest
            get() {
                val address = PostalAddress().apply {
                    streetAddress = "Stadhouderskade 78"
                    countryCodeAlpha2 = "NL"
                    locality = "Amsterdam"
                    postalCode = "1072 AE"
                }

                return LocalPaymentRequest(true).apply {
                    paymentType = "ideal"
                    amount = "1.10"
                    address = address
                    phone = "207215300"
                    email = "android-test-buyer@paypal.com"
                    givenName = "Test"
                    surname = "Buyer"
                    isShippingAddressRequired = true
                    merchantAccountId = "altpay_eur"
                    currencyCode = "EUR"
                }
            }
    }
}