import Foundation
import SwiftUI

extension Data {
    var hexDescription: String {
        return reduce("") {$0 + String(format: "%02x", $1)}
    }
	var macAddressString: String {
		let mac: String = reduce("") {$0 + String(format: "%02x:", $1)}
		return String(mac.dropLast())
	}
}

extension Date {
    static var currentTimeStamp: Int64 {
        return Int64(Date().timeIntervalSince1970 * 1000)
    }

	func formattedDate(format: String) -> String {
		let dateformat = DateFormatter()
		dateformat.dateFormat = format
		return dateformat.string(from: self)
	}
}

extension Int {

	func numberOfDigits() -> Int {
		if abs(self) < 10 {
			return 1
		} else {
			return 1 + (self/10).numberOfDigits()
		}
	}
}

extension String {

    /// Create `Data` from hexadecimal string representation
    ///
    /// This creates a `Data` object from hex string. Note, if the string has any spaces or non-hex characters (e.g. starts with '<' and with a '>'), those are ignored and only hex characters are processed.
    ///
    /// - returns: Data represented by this hexadecimal string.

    var hexadecimal: Data? {
        var data = Data(capacity: count / 2)

        let regex = try! NSRegularExpression(pattern: "[0-9a-f]{1,2}", options: .caseInsensitive)
        regex.enumerateMatches(in: self, range: NSRange(startIndex..., in: self)) { match, _, _ in
            let byteString = (self as NSString).substring(with: match!.range)
            let num = UInt8(byteString, radix: 16)!
            data.append(num)
        }

        guard data.count > 0 else { return nil }

        return data
    }
	
	func image(fontSize:CGFloat = 40, bgColor:UIColor = UIColor.clear, imageSize:CGSize? = nil) -> UIImage?
	{
		let font = UIFont.systemFont(ofSize: fontSize)
		let attributes = [NSAttributedString.Key.font: font]
		let imageSize = imageSize ?? self.size(withAttributes: attributes)

		UIGraphicsBeginImageContextWithOptions(imageSize, false, 0)
		bgColor.set()
		let rect = CGRect(origin: .zero, size: imageSize)
		UIRectFill(rect)
		self.draw(in: rect, withAttributes: [.font: font])
		let image = UIGraphicsGetImageFromCurrentImageContext()
		UIGraphicsEndImageContext()
		return image
	}
}