import random
import os

def load_board(filepath="board.txt"):
    snakes, ladders = {}, {}
    try:
        with open(filepath, "r") as f:
            for line in f:
                if line.startswith("Snakes:"):
                    pairs = line.replace("Snakes:", "").strip().split(", ")
                    snakes = {int(p.split(":")[0]): int(p.split(":")[1]) for p in pairs if ":" in p}
                elif line.startswith("Ladders:"):
                    pairs = line.replace("Ladders:", "").strip().split(", ")
                    ladders = {int(p.split(":")[0]): int(p.split(":")[1]) for p in pairs if ":" in p}
    except FileNotFoundError:
        print("Warning: board.txt not found. Loading standard board layout.")
        snakes = {12: 2, 14: 11, 17: 4, 31: 19, 35: 22}
        ladders = {3: 16, 5: 7, 15: 25, 18: 20, 21: 32}
    return snakes, ladders

def load_messages(filepath="messages.txt"):
    msgs = {
        "ladder": "A ladder moved you up to square {pos}!",
        "snake": "A snake caught you! Slid down to square {pos}.",
        "win": "Congratulations {player}! You won the game with {score} points!"
    }
    try:
        with open(filepath, "r") as f:
            for line in f:
                if "=" in line:
                    k, v = line.strip().split("=", 1)
                    msgs[k.strip()] = v.strip()
    except FileNotFoundError:
        pass
    return msgs

def display_board(p1_pos, p2_pos):
    print("\n" + "=" * 42)
    for row in range(5, -1, -1):
        line = ""
        for col in range(1, 7):
            sq = row * 6 + col
            tokens = []
            if sq == p1_pos: tokens.append("P1")
            if sq == p2_pos: tokens.append("P2")
            label = "/".join(tokens) if tokens else f"{sq:02d}"
            line += f"[{label:^5}]"
        print(line)
    print("=" * 42)

def main():
    snakes, ladders = load_board()
    msgs = load_messages()
    
    p1 = input("Enter Player 1 name: ").strip() or "Player 1"
    p2 = input("Enter Player 2 name: ").strip() or "Player 2"
    
    positions = {p1: 1, p2: 1}
    turns = {p1: 0, p2: 0}
    players = [p1, p2]
    turn_idx = 0

    while True:
        curr = players[turn_idx]
        input(f"\n{curr}'s turn (Square {positions[curr]}). Press Enter to roll dice...")
        
        d1, d2 = random.randint(1, 6), random.randint(1, 6)
        roll = d1 + d2
        turns[curr] += 1
        print(f"{curr} rolled {d1} and {d2} (Total: {roll})")
        
        new_pos = positions[curr] + roll
        if new_pos in ladders:
            new_pos = ladders[new_pos]
            print(msgs["ladder"].format(pos=new_pos))
        elif new_pos in snakes:
            new_pos = snakes[new_pos]
            print(msgs["snake"].format(pos=new_pos))
            
        positions[curr] = min(new_pos, 36)
        display_board(positions[p1], positions[p2])
        
        if positions[curr] >= 36:
            score = max(100 - (turns[curr] * 5), 10)
            print(msgs["win"].format(player=curr, score=score))
            break
            
        turn_idx = (turn_idx + 1) % 2

if __name__ == "__main__":
    main()