//: Playground - noun: a place where people can play

import UIKit

protocol MythicalCreatureDisplayable: class {
    associatedtype Conformer = Self

    var displayer: Conformer { get }
    func displayMythicalCreature()
}

final class KrakenView: UIView, MythicalCreatureDisplayable {
    func displayMythicalCreature() {
        print("draw a Kraken")
    }
}

extension MythicalCreatureDisplayable where Self: UIView {
    var displayer: UIView { return self }
}

private extension MythicalCreatureDisplayable {
    func getDisplayer() -> Conformer {
        return displayer
    }
}

final class AnyMythicalTypeDisplayable<T>: MythicalCreatureDisplayable {
    var displayer: T { return _getDisplayer() }

    private let _getDisplayer: () -> T
    private let _displayMythicalCreature: () -> Void

    required init<U: MythicalCreatureDisplayable where U.Conformer == T>(_ displayable: U) {
        _getDisplayer = displayable.getDisplayer
        _displayMythicalCreature = displayable.displayMythicalCreature
    }

    func displayMythicalCreature() {
        _displayMythicalCreature()
    }
}

let krakenView = KrakenView()
let regularView = UIView()
var mythicalDisplayableView: AnyMythicalTypeDisplayable<UIView>
mythicalDisplayableView = AnyMythicalTypeDisplayable(krakenView)