import UIKit
import VerIDCore
import VerIDUI

class MyViewController: UIViewController, VerIDFactoryDelegate, VerIDSessionDelegate {
    
    func runLivenessDetection() {
        guard let identity = try? VerIDSDKIdentity() else {
            // Failed to create SDK identity
            return
        }
        // You may want to display an activity indicator as the instance creation may take up to a few seconds
        let factory = VerIDFactory(identity: identity)
        // Set your class as the factory's delegate
        // The delegate methods will be called when the session is created or if the creation fails
        factory.delegate = self
        // Create an instance of Ver-ID
        factory.createVerID()
    }
    
    // MARK: - Ver-ID factory delegate
    
    func veridFactory(_ factory: VerIDFactory, didCreateVerID instance: VerID) {
        // Ver-ID instance was created
        // Create liveness detection settings
        let settings = LivenessDetectionSessionSettings()
        // Create a Ver-ID UI session
        let session = VerIDSession(environment: instance, settings: settings)
        // Set your class as a delegate of the session to receive the session outcome
        session.delegate = self
        // Start the session
        session.start()
    }
    
    func veridFactory(_ factory: VerIDFactory, didFailWithError error: Error) {
        NSLog("Failed to create Ver-ID instance: %@", error.localizedDescription)
    }
    
    // MARK: - Session delegate
    
    func didFinishSession(_ session: VerIDSession, withResult result: VerIDSessionResult) {
        // Session finished successfully
    }
    
    // MARK: Optional session delegate methods
    
    func didCancelSession(_ session: VerIDSession) {
        // Session was canceled
    }
    
    func shouldDisplayResult(_ result: VerIDSessionResult, ofSession session: VerIDSession) -> Bool {
        // Return `true` to display the result of the session
        return true
    }
    
    func shouldSpeakPromptsInSession(_ session: VerIDSession) -> Bool {
        // Return `true` to speak prompts in the session
        return true
    }
    
    func shouldRecordVideoOfSession(_ session: VerIDSession) -> Bool {
        // Return `true` to record a video of the session
        return true
    }
    
    func cameraPositionForSession(_ session: VerIDSession) -> AVCaptureDevice.Position {
        // Return `AVCaptureDevice.Position.back` to use the back camera instead of the front (selfie) camera
        return .back
    }
}