import Foundation

typealias CardId = String

struct Card {
    
    enum Symbol: Character {
        case ass = "A"
        case zehn = "Z"
        case könig = "K"
        case ober = "O"
        case unter = "U"
        case neun = "9"
        case acht = "8"
        case sieben = "7"
    }

    enum Suit: Character {
        case eichel = "E"
        case blatt = "B"
        case herz = "H"
        case schelln = "S"
    }


    let symbol: Symbol
    
    let suit: Suit
    
    init(suit: Suit, symbol: Symbol) {
        self.suit = suit
        self.symbol = symbol
    }
    
    init?(rawValue: String) {
        guard rawValue.count == 2 else {
            return nil
        }
        guard let suit = Suit(rawValue: rawValue.first!),
              let symbol = Symbol(rawValue: rawValue.last!) else {
                  return nil
              }
        self.suit = suit
        self.symbol = symbol
    }
    
    var id: CardId {
        "\(suit)\(symbol)"
    }
}

extension Card: CustomStringConvertible {
    
    var description: String {
        id
    }
}