377 lines
18 KiB
Python
377 lines
18 KiB
Python
import random
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import copy
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import math
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from .hexDraw import DrawHex
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from funcs import logThis
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BOARDWIDTH = 11
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ALL_POSITIONS = [(i,j) for i in range(11) for j in range(11)]
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ALL_SET = set(ALL_POSITIONS)
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EMPTY_DIJKSTRA = {}
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for position in ALL_POSITIONS:
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EMPTY_DIJKSTRA[position] = math.inf # an impossibly high number
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HEX_DIRECTIONS = [(0,1),(-1,1),(-1,0),(0,-1),(1,-1),(1,0)]
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class HexGame():
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def __init__(self,bot):
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self.bot = bot
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self.draw = DrawHex(bot)
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# Parses command
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def parseHex(self, command, channel, user):
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commands = command.lower().split()
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game = self.bot.database["hex games"].find_one({"_id":channel})
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if command == "" or command == " ":
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return "I didn't get that. Use \"!hex start [opponent]\" to start a game.", False, False, False, False
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elif commands[0] == "start":
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# Starting a game
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if len(commands) == 1: # if the commands is "!hex start", the opponent is Gwendolyn at difficulty 2
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commands.append("2")
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logThis("Starting a hex game with hexStart(). "+str(user)+" challenged "+commands[1])
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return self.hexStart(channel,user,commands[1]) # commands[1] is the opponent
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# If using a command with no game, return error
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elif game == None:
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return "There's no game in this channel", False, False, False, False
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# Stopping the game
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elif commands[0] == "stop":
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if user in game["players"]:
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return "Ending game.", False, False, True, False
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else:
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return "You can't end a game where you're not a player.", False, False, False, False
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# Placing a piece
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elif commands[0] == "place":
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try:
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return self.placeHex(channel,commands[1], user)
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except:
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return "I didn't get that. To place a piece use \"!hex place [position]\". A valid position is e.g. \"E2\".", False, False, False, False
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# Undo
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elif commands[0] == "undo":
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return self.undoHex(channel, user)
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# Surrender
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elif commands[0] == "surrender":
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players = game["players"]
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if user in players:
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opponent = (players.index(user) + 1) % 2
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self.bot.database["hex games"].update_one({"_id":channel},{"$set":{"winner":opponent + 1}})
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return "{} surrendered. That means {} won! Adding 30 Gwendobucks to their account.".format(self.bot.funcs.getName(user),self.bot.funcs.getName(players[opponent])), False, False, True, False
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else:
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return "You can't surrender when you're not a player.", False, False, False, False
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# Swap
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elif commands[0] == "swap":
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if len(game["gameHistory"]) == 1: # Only after the first move
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self.bot.database["hex games"].update_one({"_id":channel},
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{"$set":{"players":game["players"][::-1]}}) # Swaps their player-number
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# Swaps the color of the hexes on the board drawing:
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self.draw.drawSwap(channel)
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player2 = game["players"][1]
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gwendoTurn = (player2 == "Gwendolyn")
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return "The color of both players were swapped. It is now {}'s turn".format(player2), True, True, False, gwendoTurn
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else:
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return "You can only swap as the second player after the very first move.", False, False, False, False
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else:
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return "I didn't get that. Use \"!hex start [opponent]\" to start a game, \"!hex place [position]\" to place a piece, \"!hex undo\" to undo your last move or \"!hex stop\" to stop a current game.", False, False, False, False
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# Starts the game
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def hexStart(self, channel, user, opponent):
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game = self.bot.database["hex games"].find_one({"_id":channel})
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if game == None:
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if opponent in ["1","2","3","4","5"]:
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difficulty = int(opponent)
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diffText = " with difficulty "+opponent
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opponent = "Gwendolyn"
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elif opponent.lower() == "gwendolyn":
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difficulty = 2
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diffText = " with difficulty 2"
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opponent = "Gwendolyn"
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else:
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try:
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int(opponent)
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return "That difficulty doesn't exist", False, False, False, False
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except:
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opponent = self.bot.funcs.getID(opponent)
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if opponent == None:
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return "I can't find that user", False, False, False, False
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else:
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# Opponent is another player
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difficulty = 3
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diffText = ""
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# board is 11x11
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board = [ [ 0 for i in range(BOARDWIDTH) ] for j in range(BOARDWIDTH) ]
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players = [user,opponent]
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random.shuffle(players) # random starting player
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gameHistory = []
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newGame = {"_id":channel,"board":board, "winner":0,
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"players":players, "turn":1, "difficulty":difficulty, "gameHistory":gameHistory}
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self.bot.database["hex games"].insert_one(newGame)
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# draw the board
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self.draw.drawBoard(channel)
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gwendoTurn = True if players[0] == "Gwendolyn" else False
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showImage = True
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return "Started Hex game against "+self.bot.funcs.getName(opponent)+ diffText+". It's "+self.bot.funcs.getName(players[0])+"'s turn", showImage, False, False, gwendoTurn
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else:
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return "There's already a hex game going on in this channel", False, False, False, False
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# Places a piece at the given location and checks things afterwards
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def placeHex(self, channel : str,position : str, user):
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game = self.bot.database["hex games"].find_one({"_id":channel})
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if game != None:
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players = game["players"]
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if user in players:
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turn = game["turn"]
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if players[0] == players[1]:
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player = turn
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else:
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player = players.index(user)+1
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if player == turn:
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board = game["board"]
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logThis("Placing a piece on the board with placeHex()")
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# Places on board
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board = self.placeOnHexBoard(board,player,position)
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if isinstance(board, list):
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# If the move is valid:
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self.bot.database["hex games"].update_one({"_id":channel},{"$set":{"board":board}})
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turn = 1 if turn == 2 else 2
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self.bot.database["hex games"].update_one({"_id":channel},{"$set":{"turn":turn}})
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# Checking for a win
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logThis("Checking for win")
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winner = self.evaluateBoard(game["board"])[1]
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if winner == 0: # Continue with the game.
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gameWon = False
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message = self.bot.funcs.getName(game["players"][player-1])+" placed at "+position.upper()+". It's now "+self.bot.funcs.getName(game["players"][turn-1])+"'s turn."# The score is "+str(score)
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else: # Congratulations!
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gameWon = True
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self.bot.database["hex games"].update_one({"_id":channel},{"$set":{"winner":winner}})
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message = self.bot.funcs.getName(game["players"][player-1])+" placed at "+position.upper()+" and won!"
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if game["players"][winner-1] != "Gwendolyn":
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winAmount = game["difficulty"]*10
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message += " Adding "+str(winAmount)+" GwendoBucks to their account."
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self.bot.database["hex games"].update_one({"_id":channel},
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{"$push":{"gameHistory":(int(position[1])-1, ord(position[0])-97)}})
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# Is it now Gwendolyn's turn?
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gwendoTurn = False
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if game["players"][turn-1] == "Gwendolyn":
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logThis("It's Gwendolyn's turn")
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gwendoTurn = True
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# Update the board
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self.draw.drawHexPlacement(channel,player,position)
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return message, True, True, gameWon, gwendoTurn
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else:
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# Invalid move. "board" is the error message
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message = board
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return message, False, False, False, False
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else:
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# Move out of turn
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message = "It isn't your turn, it is "+self.bot.funcs.getName(game["players"][turn-1])+"'s turn."
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return message, False, False, False, False
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else:
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message = "You can't place when you're not in the game. The game's players are: "+self.bot.funcs.getName(game["players"][0])+" and "+self.bot.funcs.getName(game["players"][1])+"."
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return message, False, False, False, False
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else:
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return "There's no game in this channel", False, False, False, False
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# Returns a board where the placement has occured
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def placeOnHexBoard(self, board,player,position):
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# Translates the position
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position = position.lower()
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# Error handling
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try:
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column = ord(position[0]) - 97 # ord() translates from letter to number
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row = int(position[1:]) - 1
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if column not in range(BOARDWIDTH) or row not in range(BOARDWIDTH):
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logThis("Position out of bounds (error code 1533)")
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return "Error. That position is out of bounds."
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except:
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logThis("Invalid position (error code 1531)")
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return "Error. The position should be a letter followed by a number, e.g. \"e2\"."
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# Place at the position
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if board[row][column] == 0:
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board[row][column] = player
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return board
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else:
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logThis("Cannot place on existing piece (error code 1532)")
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return "Error. You must place on an empty space."
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# After your move, you have the option to undo get your turn back #TimeTravel
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def undoHex(self, channel, user):
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game = self.bot.database["hex games"].find_one({"_id":channel})
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if user in game["players"]:
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if len(game["gameHistory"]):
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turn = game["turn"]
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# You can only undo after your turn, which is the opponent's turn.
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if user == game["players"][(turn % 2)]: # If it's not your turn
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logThis("Undoing {}'s last move".format(self.bot.funcs.getName(user)))
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lastMove = game["gameHistory"].pop()
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self.bot.database["hex games"].update_one({"_id":channel},
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{"$set":{"board."+lastMove[0]+"."+lastMove[1]:0}})
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self.bot.database["hex games"].update_one({"_id":channel},
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{"$set":{"turn":turn%2 + 1}})
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# Update the board
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self.draw.drawHexPlacement(channel,0,"abcdefghijk"[lastMove[1]]+str(lastMove[0]+1)) # The zero makes the hex disappear
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return "You undid your last move at {}".format(lastMove), True, True, False, False
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else:
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# Sassy
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return "Nice try. You can't undo your opponent's move. ", False, False, False, False
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else:
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# Sassy
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return "Really? You undo right at the start of the game?", False, False, False, False
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else:
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return "You're not a player in the game", False, False, False, False
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# Plays as the AI
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def hexAI(self, channel):
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logThis("Figuring out best move")
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game = self.bot.database["hex games"].find_one({"_id":channel})
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board = game["board"]
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if len(game["gameHistory"]):
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lastMove = game["gameHistory"][-1]
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else:
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lastMove = (5,5)
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# These moves are the last move +- 2.
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moves = [[(lastMove[0]+j-2,lastMove[1]+i-2) for i in range(5) if lastMove[1]+i-2 in range(11)] for j in range(5) if lastMove[0]+j-2 in range(11)]
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moves = sum(moves,[])
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movesCopy = moves.copy()
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for move in movesCopy:
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if board[move[0]][move[1]] != 0:
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moves.remove(move)
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chosenMove = random.choice(moves)
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"""
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GwenColor = data[channel]["players"].index("Gwendolyn") + 1 # either 1 or 2 - red or blue
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if len(data[channel]["gameHistory"]) == 0:
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return placeHex(channel,"F6", "Gwendolyn") # If starting, start in the middle
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board = data[channel]["board"]
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difficulty = data[channel]["difficulty"]
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possiblePlaces = [i for i,v in enumerate(sum(board,[])) if v == 0]
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judgements = [float('nan')]*len(possiblePlaces) # All possible moves are yet to be judged
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current_score = evaluateBoard(board)[0]
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for i in possiblePlaces:
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testBoard = copy.deepcopy(board)
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testBoard[i // BOARDWIDTH][i % BOARDWIDTH] = GwenColor
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if evaluateBoard(testBoard)[0] != current_score: # only think about a move if it improves the score (it's impossible to get worse)
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# Testing a move and evaluating it
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judgements[i] = minimaxHex(testBoard,difficulty,-math.inf,math.inf,GwenColor==2)
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logThis("Best score for place {} is {}".format((i // BOARDWIDTH,i % BOARDWIDTH),judgements[i]))
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bestScore = max(judgements) if (GwenColor == 1) else min(judgements) # this line has an error
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indices = [i for i, x in enumerate(judgements) if x == bestScore] # which moves got that score?
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i = random.choice(indices)
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chosenMove = (i // BOARDWIDTH , i % BOARDWIDTH)
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"""
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placement = "abcdefghijk"[chosenMove[1]]+str(chosenMove[0]+1)
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logThis("ChosenMove is {} at {}".format(chosenMove,placement))
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return self.placeHex(channel,placement, "Gwendolyn")
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def evaluateBoard(self, board):
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scores = {1:0, 2:0}
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winner = 0
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# Here, I use Dijkstra's algorithm to evaluate the board, as proposed by this article: https://towardsdatascience.com/hex-creating-intelligent-adversaries-part-2-heuristics-dijkstras-algorithm-597e4dcacf93
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for player in [1,2]:
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Distance = copy.deepcopy(EMPTY_DIJKSTRA)
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# Initialize the starting hexes. For the blue player, this is the leftmost column. For the red player, this is the tom row.
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for start in (ALL_POSITIONS[::11] if player == 2 else ALL_POSITIONS[:11]):
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# An empty hex adds a of distance of 1. A hex of own color add distance 0. Opposite color adds infinite distance.
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Distance[start] = 1 if (board[start[0]][start[1]] == 0) else 0 if (board[start[0]][start[1]] == player) else math.inf
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visited = set() # Also called sptSet, short for "shortest path tree Set"
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for _ in range(BOARDWIDTH**2): # We can at most check every 121 hexes
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# Find the next un-visited hex, that has the lowest distance
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remainingHexes = ALL_SET.difference(visited)
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A = [Distance[k] for k in remainingHexes] # Find the distance to each un-visited hex
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u = list(remainingHexes)[A.index(min(A))] # Chooses the one with the lowest distance
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# Find neighbors of the hex u
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for di in HEX_DIRECTIONS:
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v = (u[0] + di[0] , u[1] + di[1]) # v is a neighbor of u
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if v[0] in range(11) and v[1] in range(11) and v not in visited:
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new_dist = Distance[u] + (1 if (board[v[0]][v[1]] == 0) else 0 if (board[v[0]][v[1]] == player) else math.inf)
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Distance[v] = min(Distance[v], new_dist)
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# After a hex has been visited, this is noted
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visited.add(u)
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#logThis("Distance from player {}'s start to {} is {}".format(player,u,Distance[u]))
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if u[player-1] == 10: # if the right coordinate of v is 10, it means we're at the goal
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scores[player] = Distance[u] # A player's score is the shortest distance to goal. Which equals the number of remaining moves they need to win if unblocked by the opponent.
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break
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else:
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logThis("For some reason, no path to the goal was found. ")
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if scores[player] == 0:
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winner = player
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break # We don't need to check the other player's score, if player1 won.
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return scores[2]-scores[1], winner
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def minimaxHex(self, board, depth, alpha, beta, maximizingPlayer):
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# The depth is how many moves ahead the computer checks. This value is the difficulty.
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if depth == 0 or 0 not in sum(board,[]):
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score = self.evaluateBoard(board)[0]
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return score
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# if final depth is not reached, look another move ahead:
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if maximizingPlayer: # red player predicts next move
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maxEval = -math.inf
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possiblePlaces = [i for i,v in enumerate(sum(board,[])) if v == 0]
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#logThis("Judging a red move at depth {}".format(depth))
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for i in possiblePlaces:
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testBoard = copy.deepcopy(board)
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testBoard[i // BOARDWIDTH][i % BOARDWIDTH] = 1 # because maximizingPlayer is Red which is number 1
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evaluation = self.minimaxHex(testBoard,depth-1,alpha,beta,False)
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maxEval = max(maxEval, evaluation)
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alpha = max(alpha, evaluation)
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if beta <= alpha:
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#logThis("Just pruned something!")
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break
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return maxEval
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else: # blue player predicts next move
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minEval = math.inf
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possiblePlaces = [i for i,v in enumerate(sum(board,[])) if v == 0]
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#logThis("Judging a blue move at depth {}".format(depth))
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for i in possiblePlaces:
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testBoard = copy.deepcopy(board)
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testBoard[i // BOARDWIDTH][i % BOARDWIDTH] = 2 # because minimizingPlayer is Blue which is number 2
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evaluation = self.minimaxHex(testBoard,depth-1,alpha,beta,True)
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minEval = min(minEval, evaluation)
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beta = min(beta, evaluation)
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if beta <= alpha:
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#logThis("Just pruned something!")
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break
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return minEval
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