#4

var thumbnailImage: UIImage {
        let imageSize: CGFloat = 100
        UIGraphicsBeginImageContextWithOptions(CGSize(width: imageSize, height: imageSize), false, 0)
        let context = UIGraphicsGetCurrentContext()!
        if let image = isEmpty ? KSAvatarBundle.defaultContactImage : self.image {
            context.beginPath()
            context.addArc(center: CGPoint(x: imageSize / 2, y: imageSize / 2), radius: imageSize / 2, startAngle: 0, endAngle: 2 * .pi, clockwise: false)
            context.closePath()
            context.clip()

            let scaleFactor = imageSize / image.size.width
            context.scaleBy(x: scaleFactor, y: scaleFactor)

            image.draw(at: .zero)
        } else {
            context.saveGState()
            context.setFillColor(KSAvatarBundle.contactIconColors[colorIndex!].cgColor)
            context.fillEllipse(in: CGRect(x: 0, y: 0, width: imageSize, height: imageSize))
            context.restoreGState()

            let text = character! as NSString
            let font = UIFont.systemFont(ofSize: imageSize * 0.55)
            let textSize = text.size(withAttributes: convertToOptionalNSAttributedStringKeyDictionary([convertFromNSAttributedStringKey(NSAttributedString.Key.font): font]))
            let textRect = CGRect(x: imageSize / 2 - textSize.width / 2, y: imageSize / 2 - textSize.height / 2, width: textSize.width, height: textSize.height)
            text.draw(in: textRect, withAttributes: convertToOptionalNSAttributedStringKeyDictionary([convertFromNSAttributedStringKey(NSAttributedString.Key.font): font, convertFromNSAttributedStringKey(NSAttributedString.Key.foregroundColor): UIColor.white]))
        }

        let img = UIGraphicsGetImageFromCurrentImageContext()!
        UIGraphicsEndImageContext()
        return img
    }