app.py

import streamlit as st
import streamlit.components.v1 as components
from streamlit.components.v1 import html
import chess
import streamlit_scrollable_textbox as stx
from st_bridge import bridge
from modules.chess import Chess
from modules.utility import set_page
from modules.states import init_states
import datetime as dt
from gradio_client import Client
import random

set_page(title='Chess vs LLaMA 3.1 405B', page_icon="♟️")
init_states()
st.session_state.board_width = 400

# Initialize the LLaMA 3.1 405B client
llama_client = Client("xianbao/SambaNova-fast")

# Initialize all session state variables
if 'player_color' not in st.session_state:
    st.session_state.player_color = 'white'
if 'current_turn' not in st.session_state:
    st.session_state.current_turn = 'white'
if 'game_started' not in st.session_state:
    st.session_state.game_started = False
if 'curfen' not in st.session_state:
    st.session_state.curfen = "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1"
if 'lastfen' not in st.session_state:
    st.session_state.lastfen = None
if 'moves' not in st.session_state:
    st.session_state.moves = {}
if 'curside' not in st.session_state:
    st.session_state.curside = 'white'

def get_ai_move(fen):
    board = chess.Board(fen)
    legal_moves = list(board.legal_moves)
    
    if not legal_moves:
        return None

    prompt = f"You are a chess engine. Given the following chess position in FEN notation: {fen}, suggest a good move. Respond with only the move in UCI notation (e.g., e2e4)."
    
    for _ in range(3):  # Try up to 3 times to get a valid move from the AI
        try:
            response = llama_client.predict(
                message=prompt,
                system_message="You are a chess engine assistant.",
                max_tokens=10,
                temperature=0.7,  # Increased temperature for more varied moves
                top_p=0.9,
                top_k=50,
                api_name="/chat"
            )
            move = chess.Move.from_uci(response.strip())
            if move in legal_moves:
                return move.uci()
        except ValueError:
            pass  # If the AI produces an invalid move, we'll try again
    
    # If the AI fails to produce a valid move after 3 attempts, choose a random legal move
    return random.choice(legal_moves).uci()

def reset_game(player_color):
    st.session_state.player_color = player_color
    st.session_state.curfen = "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1"
    st.session_state.moves = {}
    st.session_state.current_turn = 'white'
    st.session_state.game_started = True
    st.session_state.lastfen = None
    st.session_state.game_over = False

    # If player chose black, make the first move for AI
    if st.session_state.player_color == 'black':
        ai_move = get_ai_move(st.session_state.curfen)
        board = chess.Board(st.session_state.curfen)
        if ai_move:
            move = chess.Move.from_uci(ai_move)
            board.push(move)
            st.session_state.curfen = board.fen()
            st.session_state.moves.update(
                {
                    st.session_state.curfen : {
                        'side': 'white', 
                        'curfen': st.session_state.curfen,
                        'last_fen': "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1",
                        'last_move': ai_move,
                        'data': None,
                        'timestamp': str(dt.datetime.now()) 
                    }
                }
            )
            st.session_state.current_turn = 'black'

def check_game_end(board):
    outcome = board.outcome()
    if outcome:
        st.session_state.game_over = True
        if outcome.winner is None:
            return "Draw"
        return "White" if outcome.winner else "Black"
    return None

st.title("Chess vs LLaMA 3.1 405B")

# Game controls
col1, col2, col3 = st.columns([1,1,1])
with col1:
    player_color = st.selectbox("Choose your color", ['white', 'black'], key='color_select')
with col2:
    if st.button('Start New Game', key='start_game'):
        reset_game(player_color)
        st.rerun()
with col3:
    st.write(f"Current turn: {st.session_state.current_turn}")
    st.write(f"Your color: {st.session_state.player_color}")

# Get the info from current board after the user made the move.
data = bridge("my-bridge")
if data is not None and st.session_state.game_started and not st.session_state.game_over:
    st.session_state.lastfen = st.session_state.curfen
    st.session_state.curfen = data['fen']
    st.session_state.curside = data['move']['color'].replace('w','white').replace('b','black')
    st.session_state.moves.update(
        {
            st.session_state.curfen : {
                'side':st.session_state.curside, 
                'curfen':st.session_state.curfen,
                'last_fen':st.session_state.lastfen,
                'last_move':data['pgn'],
                'data': None,
                'timestamp': str(dt.datetime.now()) 
            }
        }
    )
    st.session_state.current_turn = 'white' if st.session_state.curside == 'black' else 'black'
    
    board = chess.Board(st.session_state.curfen)
    game_result = check_game_end(board)
    if game_result:
        st.success(f"Game Over! Winner: {game_result}")
    elif st.session_state.current_turn != st.session_state.player_color:
        # AI's turn
        ai_move = get_ai_move(st.session_state.curfen)
        if ai_move:
            move = chess.Move.from_uci(ai_move)
            board.push(move)
            st.session_state.curfen = board.fen()
            st.session_state.moves.update(
                {
                    st.session_state.curfen : {
                        'side': st.session_state.current_turn, 
                        'curfen': st.session_state.curfen,
                        'last_fen': st.session_state.lastfen,
                        'last_move': ai_move,
                        'data': None,
                        'timestamp': str(dt.datetime.now()) 
                    }
                }
            )
            st.session_state.current_turn = st.session_state.player_color
            game_result = check_game_end(board)
            if game_result:
                st.success(f"Game Over! Winner: {game_result}")
        else:
            st.error("The AI couldn't make a move. The game may be over.")

# Main game display
cols = st.columns([3, 2])
with cols[0]:
    if st.session_state.game_started:
        puzzle = Chess(st.session_state.board_width, st.session_state.curfen)
        components.html(
            puzzle.puzzle_board(),
            height=st.session_state.board_width + 75,
            scrolling=False
        )
        board = chess.Board(st.session_state.curfen)
        
        # Game status
        status_col1, status_col2 = st.columns(2)
        with status_col1:
            st.write("Game Status:")
            st.write(f"Check: {'Yes' if board.is_check() else 'No'}")
            st.write(f"Checkmate: {'Yes' if board.is_checkmate() else 'No'}")
        with status_col2:
            st.write("\u200B")  # Invisible character for alignment
            st.write(f"Stalemate: {'Yes' if board.is_stalemate() else 'No'}")
            st.write(f"Insufficient material: {'Yes' if board.is_insufficient_material() else 'No'}")
        
        if st.session_state.game_over:
            st.success(f"Game Over! Winner: {check_game_end(board)}")
    else:
        st.info("Welcome to Chess vs LLaMA 3.1 405B!")
        st.write("To start a new game:")
        st.write("1. Choose your color (white or black)")
        st.write("2. Click 'Start New Game'")
        st.write("3. Make your moves on the chess board")
        st.write("Enjoy playing against the AI!")

with cols[1]:
    if st.session_state.game_started:
        st.subheader("Move History")
        records = [
            f"##### {value['timestamp'].split('.')[0]} \n {value['side']} - {value.get('last_move','')}"
                for key, value in st.session_state['moves'].items()
        ]
        stx.scrollableTextbox('\n\n'.join(records), height = 400, border=True)
    else:
        st.image("https://upload.wikimedia.org/wikipedia/commons/6/6f/ChessSet.jpg", caption="Chess pieces", use_column_width=True)