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import StripeTerminal

class DiscoverReadersViewController: UIViewController, DiscoveryDelegate {

    var discoverCancelable: Cancelable?

    // ...

    // Action for a "Discover Readers" button
    func discoverReadersAction() throws {
        let config = try TapToPayDiscoveryConfigurationBuilder().build()
        self.discoverCancelable = Terminal.shared.discoverReaders(config, delegate: self) { error in
            if let error = error {
                print("discoverReaders failed: \(error)")
            } else {
                print("discoverReaders succeeded")
            }
        }
    }

    // ...

    // MARK: DiscoveryDelegate

    func terminal(_ terminal: Terminal, didUpdateDiscoveredReaders readers: [Reader]) {
        // In your app, display the ability to use your phone as a reader
        // Call `connectReader` to initiate a session with the phone
    }
}

// Call `connectReader` with the selected reader and a connection config
// to register to a location as set by your app.
let connectionConfig = try TapToPayConnectionConfigurationBuilder.init(locationId: 
"{{LOCATION_ID}}")
.delegate(yourTapToPayReaderDelegate)
.build()
Terminal.shared.connectReader(selectedReader, connectionConfig: connectionConfig) { reader, error in
    if let reader = reader {
        print("Successfully connected to reader: \(reader)")
    } else if let error = error {
        print("connectReader failed: \(error)")
    }
}

class APPReaderViewController: TapToPayReaderDelegate {

    // MARK: TapToPayReaderDelegate

    // ...

    func tapToPayReader(_ reader: Reader, didStartInstallingUpdate update: ReaderSoftwareUpdate, cancelable: Cancelable?) {
        // In your app, let the user know that an update is being installed on the reader
    }

    func tapToPayReader(_ reader: Reader, didReportReaderSoftwareUpdateProgress progress: Float) {
        // The update or configuration process has reached the specified progress (0.0 to 1.0)
        // If you are displaying a progress bar or percentage, this can be updated here
    }

    func tapToPayReader(_ reader: Reader, didFinishInstallingUpdate update: ReaderSoftwareUpdate?, error: Error?) {
        // The reader has finished installing an update
        // If `error` is nil, it is safe to proceed and start collecting payments
        // Otherwise, check the value of `error` for more information on what went wrong
    }

    func tapToPayReader(_ reader: Reader, didRequestReaderDisplayMesage displayMessage: ReaderDisplayMessage) {
        // This is called to request that a prompt be displayed in your app.
        // Use Terminal.stringFromReaderDisplayMessage(:) to get a user-facing string for the prompt
    }

    func tapToPayReader(_ reader: Reader, didRequestReaderInput inputOptions: ReaderInputOptions = []) {
        // This is called when the reader begins waiting for input
        // Use Terminal.stringFromReaderInputOptions(:) to get a user-facing string for the input options
    }

    // ...
}