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| package playground | |
| import scala.annotation.tailrec | |
| import scala.io.StdIn | |
| import scala.util.Random | |
| trait Action { | |
| def actionType(): String | |
| } | |
| case class GuessAction(wasRight: Boolean, result: String) extends Action { | |
| override def actionType(): String = "GUESS" | |
| } | |
| case class GameState(tries: Int, wins: Int, lastResult: String, continue: Boolean = true) | |
| object GameState { | |
| def update(state: GameState, action: Action): GameState = action match { | |
| case GuessAction(true, result) => state.copy(tries = state.tries + 1, wins = state.wins + 1, lastResult = result) | |
| case GuessAction(false, result) => state.copy(tries = state.tries + 1, lastResult = result) | |
| case _ => state | |
| } | |
| } | |
| object PlayerInteraction { | |
| def inputOption(): String = StdIn.readLine.toUpperCase | |
| } | |
| object GameInterface { | |
| def showPrompt() = print("\n(h)eads, (t)ails or (q)quit? ") | |
| def showState(state: GameState) = println(s"tries: ${state.tries}, wins: ${state.wins}") | |
| def showAttemptResult(wasRight: Boolean) = | |
| if(wasRight) println("Yes! You guessed it!") | |
| else println("Sorry! You're wrong") | |
| def showGameOver(state: GameState) = { | |
| println("================") | |
| println("Game Over") | |
| println("================") | |
| } | |
| } | |
| object Game extends App { | |
| def start = gameLoop(GameState(0, 0, "", true), Random) | |
| @tailrec | |
| def gameLoop(state: GameState, random: Random): Unit = { | |
| // Shows the prompt | |
| GameInterface.showPrompt() | |
| // get user input (heads, tails or quit) | |
| val userOption = PlayerInteraction.inputOption() | |
| // Check user input | |
| userOption match { | |
| case "H" | "T" => { | |
| val side = flipCoin(random.nextInt(2)) | |
| val rightGuess = isGuessRight(userOption, side) | |
| val action = | |
| if(rightGuess) new GuessAction(true, side) | |
| else new GuessAction(false, side) | |
| val nextState = GameState.update(state, action) | |
| guessResult(nextState, rightGuess) | |
| gameLoop(nextState, random) | |
| } | |
| case "Q" => endGame(state) | |
| case _ => gameLoop(state, random) | |
| } | |
| } | |
| def isGuessRight(playerGuess: String, side: String) = | |
| playerGuess == side | |
| def guessResult(state: GameState, wasRight: Boolean) = { | |
| GameInterface.showAttemptResult(wasRight) | |
| GameInterface.showState(state) | |
| } | |
| def endGame(state: GameState) = { | |
| GameInterface.showGameOver(state) | |
| GameInterface.showState(state) | |
| } | |
| def flipCoin(value: Int): String = value match { | |
| case 0 => "H" | |
| case 1 => "T" | |
| case _ => "?" | |
| } | |
| Game.start | |
| } |
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