import UIKit
import CoreImage

// Unsure why this typealias is needed, but, Swift compiler errors, saying "Use of undeclared type 'CIImage'"
// if we do not typealias CIImage in a func in an extension.
typealias SillyImage = CIImage

extension UIImage {
	public func isSelfie() -> Bool {
		let CIImageRepresentation: SillyImage = self.CIImage ?? SillyImage(image: self)!

		let context = CIContext(options: nil)
		let detectionOptions = [ CIDetectorAccuracy: CIDetectorAccuracyHigh ]
		let detector = CIDetector(ofType: CIDetectorTypeFace, context: context, options: detectionOptions)
		let features = detector.featuresInImage(CIImageRepresentation)

		return features.count == 1 && features.first!.type == CIFeatureTypeFace
	}
}