//
//  NSColor.swift
//  flutter_inappwebview
//
//  Created by Lorenzo Pichilli on 19/02/21.
//

import Foundation

extension NSColor {
    convenience init(hexString: String) {
        let hex = hexString.trimmingCharacters(in: CharacterSet.alphanumerics.inverted)
        var int = UInt64()
        Scanner(string: hex).scanHexInt64(&int)
        let a, r, g, b: UInt64
        switch hex.count {
        case 3: // RGB (12-bit)
            (a, r, g, b) = (255, (int >> 8) * 17, (int >> 4 & 0xF) * 17, (int & 0xF) * 17)
        case 6: // RGB (24-bit)
            (a, r, g, b) = (255, int >> 16, int >> 8 & 0xFF, int & 0xFF)
        case 8: // ARGB (32-bit)
            (a, r, g, b) = (int >> 24, int >> 16 & 0xFF, int >> 8 & 0xFF, int & 0xFF)
        default:
            (a, r, g, b) = (255, 0, 0, 0)
        }
        self.init(red: CGFloat(r) / 255, green: CGFloat(g) / 255, blue: CGFloat(b) / 255, alpha: CGFloat(a) / 255)
    }
    
    var hexString: String? {
        guard let rgbColor = usingColorSpace(.sRGB) else {
            return "#FFFFFF"
        }
        let red: CGFloat = rgbColor.redComponent
        let green: CGFloat = rgbColor.greenComponent
        let blue: CGFloat = rgbColor.blueComponent
        let alpha: CGFloat = rgbColor.alphaComponent

        if alpha == 1.0 {
            return String(
                format: "#%02lX%02lX%02lX",
                Int(red * 0xFF),
                Int(green * 0xFF),
                Int(blue * 0xFF)
            )
        }
        else {
            return String(
                format: "#%02lX%02lX%02lX%02lX",
                Int(red * 0xFF),
                Int(green * 0xFF),
                Int(blue * 0xFF),
                Int(alpha * 0xFF)
            )
        }
    }
}
