Codingame : Winamax Sponsored Contest

Winamax_Sponsored_Contest.java

import java.util.*;
import java.io.*;
import java.math.*;

/**
 * Auto-generated code below aims at helping you parse
 * the standard input according to the problem statement.
 **/
class Solution {

    private static final String NOBODY_WINS = "PAT";
	private static final String PLAYER_1_WIN = "1";
	private static final String PLAYER_2_WIN = "2";
	
	private static class Player{
	    private final Queue<Card> cardsToPlay;
	    private final Queue<Card> cardsOnStack;
	    
	    private Player(Queue<Card> cards){
	            this.cardsToPlay = cards;
	            this.cardsOnStack = new LinkedList<>();
	    }
	    
	    public Card playCard(){
	        Card card = cardsToPlay.poll();
	        cardsOnStack.offer(card);
	        return card;
	    }
	    
	    public boolean hasCardsToPlay(){
	        return cardsToPlay.size() >0;
	    }
	    
	    public boolean hasEnoughCardsForWar() {
			return cardsToPlay.size() >= 4;
		}
	    
	    public void giveUp() {
			cardsToPlay.clear();
		}
	    
	    public void prepareForWar() {
			for (int i = 0; i < 3; i++) {
				playCard();
			}
		}
		
		public void collectWinningsFromPlayer(Player looser) {
			while (!looser.cardsOnStack.isEmpty()) {
				this.cardsToPlay.offer(looser.cardsOnStack.poll());
			}
		}
	    
	}
	
	
	
	private static class Card{
	    private final int value;
	    private Card(int val){
	        this.value = val;   
	    }
	    private Card(String sValue){
	        String val = sValue.substring(0,sValue.length() -1);
	        switch(val){
	            case"J" : this.value = 11; 
	                break;
	            case"Q" : this.value = 12;
	                break;
	            case"K" : this.value = 13;
	                break;
	            case"A" : this.value = 14;
	                break;
	            default : this.value = Integer.parseInt(val);
	        }
	    }
	    private int getValue(){
	        return value;   
	    }
	}
	
	private static class GameEngine{
	    private int rounds;
		private final Player player1;
		private final Player player2;
		
		private GameEngine(Player player1, Player player2) {
			this.player1 = player1;
			this.player2 = player2;
		}
		
		public String play() {
			while (player1.hasCardsToPlay() && player2.hasCardsToPlay()) {
				playBattle();
				rounds++;
			}
			return getWinnerAndRounds();
		}
		
		private void playBattle() {
			Card player1Card = player1.playCard();
			Card player2Card = player2.playCard();
			fight(player1Card, player2Card);
		}
		
		private void fight(Card player1Card, Card player2Card) {
			if (player1Card.getValue() > player2Card.getValue()) {
				assignWinningsToPlayer(player1);
			} else if (player1Card.getValue() < player2Card.getValue()) {
				assignWinningsToPlayer(player2);
			} else {
				playWar();
			}
		}
		
		private void assignWinningsToPlayer(Player winner) {
			winner.collectWinningsFromPlayer(player1);
			winner.collectWinningsFromPlayer(player2);
		}
		
		private void playWar(){
		    if(isWarDoable()){
		        prepareForWar();
		        playBattle();
		    }
		    else {
		        forceGameToEnd();   
		    }
		}
		
		private boolean isWarDoable() {
			return player1.hasEnoughCardsForWar() && player2.hasEnoughCardsForWar();
		}
		
		private void prepareForWar() {
			player1.prepareForWar();
			player2.prepareForWar();
		}
		
		private void forceGameToEnd() {
			player1.giveUp();
			player2.giveUp();
		}
		
		private String getWinnerAndRounds() {
			if (player1.hasCardsToPlay()) {
				return PLAYER_1_WIN + " " + rounds;
			} else if (player2.hasCardsToPlay()) {
				return PLAYER_2_WIN + " " + rounds;
			} else {
				return NOBODY_WINS;
			}
		}
	}
	
    public static void main(String args[]) {
        Scanner in = new Scanner(System.in);
        Queue<Card> play1Cards = new LinkedList<>();
        int n = in.nextInt(); // the number of cards for player 1
        for (int i = 0; i < n; i++) {
            String cardp1 = in.next(); // the n cards of player 1
            play1Cards.offer(new Card(cardp1));
        }
        
        Queue<Card> play2Cards = new LinkedList<>();
        int m = in.nextInt(); // the number of cards for player 2
        for (int i = 0; i < m; i++) {
            String cardp2 = in.next(); // the m cards of player 2
            play2Cards.offer(new Card(cardp2));
        }
        
        Player play1 = new Player(play1Cards);
        Player play2 = new Player(play2Cards);
        GameEngine game = new GameEngine(play1,play2);
        
        System.out.println(game.play());
    }
}