//
//  UIColor.swift
//  ScrollingFeed
//
//  Created by Zingis, Uldis on 7/1/20.
//  Copyright © 2020 Twitch. All rights reserved.
//

import UIKit

extension UIColor {
    convenience init(hex: String) {
        let a, r, g, b: UInt64
        let hexString = hex.trimmingCharacters(in: CharacterSet.alphanumerics.inverted)
        var int = UInt64()

        Scanner(string: hexString).scanHexInt64(&int)

        switch hexString.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
        )
    }
}