BUT3Jeu/game.py

class Game(int):

    def __init__(self, start):
        #Game variables
        self.matches = start # number of matches
        self.state = 0 #-1 = lost, 0 = draw, +1 = won
        self.playerTurn = 1 # 1 = player 1 is playing, 2 = player 2 is playing
        #Algorithm variables
        self.exploreMaxCalls = 0 # Call counter of exploreMax
        self.exploreMinCalls = 0 # Call counter of exploreMax
        self.firstPlayerWinning = False # Result of MinMax

    def miniMax(self):
        '''
        `miniMax` function starts the MiniMax algorithm

            Params :
            self -- the current instance of the game

            Return :
            -1 = lost or 0 = draw or +1 = won -- depends on the possibility to win of the player
        '''
        if(self.playerTurn == 1):
            res = self.exploreMax(self.matches)
        if(self.playerTurn == 2):
            res = self.exploreMin(self.matches)
        if(res == -1):
            self.firstPlayerWinning = False
        else:
            self.firstPlayerWinning = True
        return res

    def exploreMax(self, n):
        '''
        `exploreMax` function tries to find if a player has possibilities to win the game

            Params :
            self -- the current instance of the game
            n -- a number of matches

            Return :
            -1 = lose or 0 = draw or +1 = win -- depends on the possibility to win of the player
        '''
        self.exploreMaxCalls += 1
        bestVal = -1
        if(n<=0):
            return 1
        for i in range (1,4):
            res = self.exploreMin(n-i)
            if(res > bestVal):
                bestVal = res
                if(bestVal == 1):
                    break
        return bestVal

    def exploreMin(self, n):
        '''
        `exploreMin` function tries to find if a player has possibilities to win the game

            Params :
            self -- the current instance of the game
            n -- a number of matches

            Return :
            -1 = lose or 0 = draw or +1 = win -- depends on the possibility to win of the player
        '''
        self.exploreMinCalls += 1
        worstVal = 1
        if(n<=0):
            return -1
        for i in range (1,4):
            res = self.exploreMax(n-i)
            if(res < worstVal):
                worstVal = res
                if(worstVal == -1):
                    break
        return worstVal

    def __str__(self):
        '''
        `__str__` function overrides the default function to get a custom display when printing the game object

            Params :
            self -- the current instance of the game

            Return :
            string -- contains all the game and algorithm values
        '''
        content = ( "-----------------------\n"
                    "Game and algorithm data\n"
                    "-----------------------\n"
                    "== Game data ==\n"
                    f"Remaining matches : {self.matches}\n"
                    f"Game state : {self.state}\n"
                    f"Actual player : {self.playerTurn}\n"
                    "== Algorithm data ==\n"
                    f"exploreMax calls = {self.exploreMaxCalls}\n"
                    f"exploreMin calls = {self.exploreMinCalls}\n"
                    f"First player winning ? = {self.firstPlayerWinning}\n"         
                   )
        return content
        

game = Game(42) # Creating Nim game with 5 matches
game.miniMax() # Checking if the player 1 is winning
print(game) # Displays game and algorithm data