import UIKit
import SITHSManager

class ViewController: UIViewController {
  
  @IBOutlet weak var stateLabel: UILabel! // Simple label on the view to show status
  
  let sithsManager = SITHSManager() // Store a reference to the manager, so it's not released (causing notifications to stop)
  
  override func viewDidLoad() {
    super.viewDidLoad()
    
    // Add a state change closure, the state can also be read from the `sithsManager.state` property directly
    sithsManager.stateClosure = { [weak self] state in
      guard let stateLabel = self?.stateLabel else {
        return
      }
      
      // Switch for the different states
      switch state {
      case .unknown:
        stateLabel.textColor = .black
        stateLabel.text = "Unknown"
      case .readingFromCard:
        stateLabel.textColor = .black
        stateLabel.text = "Reading From Card..."
      case .error(let error):
        stateLabel.textColor = .red
        stateLabel.text = "Error \(error)"
      case .readerDisconnected:
        stateLabel.textColor = .red
        stateLabel.text = "Reader Disconnected"
      case .unknownCardInserted:
        stateLabel.textColor = .red
        stateLabel.text = "Unknown Card Inserted"
      case .cardWithoutCertificatesInserted:
        stateLabel.textColor = .red
        stateLabel.text = "SITHS Card Without Certificates Inserted"
      case .readerConnected:
        stateLabel.textColor = .blue
        stateLabel.text = "Reader Connected"
      case .cardInserted(let certificates):
        // We have a set of at least one SITHS certificate (see the `SITHSCardCertificate` struct for more information)
        let strings = certificates.map { certificate in
          return "• \(certificate.cardNumber) \(certificate.serialString) \(certificate.subject[.commonName] ?? "[No common name]")"
        }
        
        stateLabel.textColor = .green
        stateLabel.text = "SITHS Card Inserted:\n\(strings.joined(separator: "\n"))"
      }
    }
  }
}