import Foundation
import LocalAuthentication

/// Face ID / Touch ID gating for the app lock and for sensitive actions.
enum Biometrics {
  static var isAvailable: Bool {
    LAContext().canEvaluatePolicy(.deviceOwnerAuthenticationWithBiometrics, error: nil)
  }

  static var label: String {
    let context = LAContext()
    _ = context.canEvaluatePolicy(.deviceOwnerAuthenticationWithBiometrics, error: nil)
    return context.biometryType == .faceID ? "Face ID" : "Touch ID"
  }

  /// Biometrics with the system passcode fallback (the alert offers "Use
  /// Passcode" after a failed face scan).
  static func authenticate(reason: String) async -> Bool {
    guard isAvailable else { return false }
    let context = LAContext()
    context.localizedCancelTitle = "Cancel"
    return (try? await context.evaluatePolicy(.deviceOwnerAuthenticationWithBiometrics,
                                             localizedReason: reason)) ?? false
  }
}