MadLib.swift

//
//  main.swift
//  Mad
//
//  Created by Mack on 10/13/19.
//  Copyright © 2019 Mack. All rights reserved.
//

import Foundation

func prompt(_ request: String) -> String! { print(request); return readLine() }

enum FillIn: String {
  case name, adjective, noun
}

enum Lib {
  case words(String)
  case fillIn(FillIn)
  
  func promptedDescription() -> String {
    switch self {
    case .words(let words):
      return words
    case .fillIn(let fillIn):
      return prompt("Can I get a \(fillIn.rawValue)?")
    }
  }
}

typealias MadLib = [Lib]

extension MadLib {
  func sentence() -> String {
    return self
      .map { $0.promptedDescription() }
      .joined(separator: " ")
  }
}

let excused: MadLib = [
  .words("Please excuse"),
  .fillIn(.name),
  .words("who is far too"),
  .fillIn(.adjective),
  .words("to attend"),
  .fillIn(.noun),
  .words("class.")
]

print(excused.sentence())

// Can I get a name?
// Mack
// Can I get a adjective?
// hot
// Can I get a noun?
// spoon
// Please excuse Mack who is far too hot to attend spoon class.
// Program ended with exit code: 0