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import streamlit as st
import math
# --- Initialize session state ---
if "board" not in st.session_state:
st.session_state.board = [' ']*9
if "game_over" not in st.session_state:
st.session_state.game_over = False
if "winner" not in st.session_state:
st.session_state.winner = None
# --- Game Logic ---
def check_winner(player):
win_combos = [
[0,1,2], [3,4,5], [6,7,8],
[0,3,6], [1,4,7], [2,5,8],
[0,4,8], [2,4,6]
]
for combo in win_combos:
if all(st.session_state.board[i] == player for i in combo):
return True
return False
def is_full():
return ' ' not in st.session_state.board
def minimax(is_maximizing, alpha, beta):
if check_winner('O'):
return 1
if check_winner('X'):
return -1
if is_full():
return 0
if is_maximizing:
max_eval = -math.inf
for i in range(9):
if st.session_state.board[i] == ' ':
st.session_state.board[i] = 'O'
eval_score = minimax(False, alpha, beta)
st.session_state.board[i] = ' '
max_eval = max(max_eval, eval_score)
alpha = max(alpha, eval_score)
if beta <= alpha:
break
return max_eval
else:
min_eval = math.inf
for i in range(9):
if st.session_state.board[i] == ' ':
st.session_state.board[i] = 'X'
eval_score = minimax(True, alpha, beta)
st.session_state.board[i] = ' '
min_eval = min(min_eval, eval_score)
beta = min(beta, eval_score)
if beta <= alpha:
break
return min_eval
def ai_move():
best_score = -math.inf
move = None
for i in range(9):
if st.session_state.board[i] == ' ':
st.session_state.board[i] = 'O'
score = minimax(False, -math.inf, math.inf)
st.session_state.board[i] = ' '
if score > best_score:
best_score = score
move = i
st.session_state.board[move] = 'O'
# --- Reset Game ---
def reset_game():
st.session_state.board = [' ']*9
st.session_state.game_over = False
st.session_state.winner = None
# --- Handle Player Move ---
def handle_click(i):
if st.session_state.board[i] == ' ' and not st.session_state.game_over:
st.session_state.board[i] = 'X'
if check_winner('X'):
st.session_state.game_over = True
st.session_state.winner = "You"
return
if is_full():
st.session_state.game_over = True
st.session_state.winner = "Draw"
return
ai_move()
if check_winner('O'):
st.session_state.game_over = True
st.session_state.winner = "AI"
elif is_full():
st.session_state.game_over = True
st.session_state.winner = "Draw"
# --- UI Layout ---
st.title("🤖 Tic-Tac-Toe with AI")
st.write("You are X. The AI is O. Click on a box to make your move.")
# Display Board as 3x3 buttons
cols = st.columns(3)
for row in range(3):
for col in range(3):
idx = row*3 + col
with cols[col]:
if st.button(st.session_state.board[idx] if st.session_state.board[idx] != ' ' else ' ', key=idx):
handle_click(idx)
# Game Status
if st.session_state.game_over:
if st.session_state.winner == "Draw":
st.subheader("🤝 It's a Draw!")
else:
st.subheader(f"🏆 {st.session_state.winner} Wins!")
# Reset Button
if st.button("🔄 Reset Game"):
reset_game()
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