import random
import os

def play_round():
    choices = ["rock", "paper", "scissors"]
    computer_choice = random.choice(choices)

    while True:
        user_choice = input("Enter rock, paper, or scissors: ").lower()
        if user_choice in choices:
            break
        else:
            print("Invalid choice. Please enter rock, paper, or scissors.")

    print(f"You chose: {user_choice}")
    print(f"Computer chose: {computer_choice}")

    if user_choice == computer_choice:
        print("It's a tie!")
        return 0
    elif (
        (user_choice == "rock" and computer_choice == "scissors")
        or (user_choice == "paper" and computer_choice == "rock")
        or (user_choice == "scissors" and computer_choice == "paper")
    ):
        print("You win!")
        return 1
    else:
        print("You lose!")
        return -1

def save_game_history(user_score, computer_score, result):
    filename = "game_history.txt"
    mode = "a" if os.path.exists(filename) else "w"  # Append if file exists, create otherwise

    with open(filename, mode) as f:
        if mode == "w":
            f.write("Round,User Choice,Computer Choice,Result,User Score,Computer Score,User Win Percentage,Computer Win Percentage\n")
        
        user_choice_save = ""
        computer_choice_save = ""
        result_string = ""
        
        if result == 1:
            result_string = "Win"
        elif result == -1:
            result_string = "Lose"
        else:
            result_string = "Tie"
        
        if mode == "a":
            user_choice_save = input("Enter rock, paper, or scissors: ").lower()
            computer_choice_save = random.choice(["rock", "paper", "scissors"])
            
        total_rounds = user_score + computer_score
        user_win_percentage = (user_score / total_rounds) * 100 if total_rounds > 0 else 0
        computer_win_percentage = (computer_score / total_rounds) * 100 if total_rounds > 0 else 0

        f.write(f"{total_rounds},{user_choice_save},{computer_choice_save},{result_string},{user_score},{computer_score},{user_win_percentage:.2f}%,{computer_win_percentage:.2f}%\n")
        print(f"Game history saved to {filename}")

def main():
    user_score = 0
    computer_score = 0

    print("Welcome to Rock, Paper, Scissors!")

    while True:
        result = play_round()
        if result == 1:
            user_score += 1
        elif result == -1:
            computer_score += 1
        
        save_game_history(user_score, computer_score, result)
        
        play_again = input("Play again? (yes/no): ").lower()
        if play_again != "yes":
            break

if __name__ == "__main__":
    main()