import random


# check that users have entered a valid
# option based on a list
def string_checker(question, valid_ans=('yes', 'no')):
    while True:

        error = f"Please enter a valid option from the following list: {valid_ans}"


        # Get user response and make sure it's lowercase
        user_response = input(question).lower()

        for item in valid_ans:
            # check if the user response is a word in the list
            if item == user_response:
                return item

            # check if the user response is the same as
            # the first letter of an item in the list
            elif user_response == item[0]:
                return item

        # print error if user does not enter something valid
        print(error)
        print()

def instructions():
    """Prints instructions"""

    print("""
*** Instructions ***

To begin, choose the number of rounds (or press <enter> for 
infinite mode).

Then play against the computer. You choose R (rock),
P (paper) or S (scissors).

The rules are as follows:
o  Paper beats rock
o Rock beats scissors
o scissors beats paper

Good luck!
    """)


# check that users have entered a valid
def int_check(question):
    while True:
        error = "Please enter and integer that is 1 or more."

        to_check = input(question)

        # check for infinite mode
        if to_check == "":
            return "infinite"

        try:
            response = int(to_check)

            # checks that the number is more than / equal to 13
            if response < 1:
                print(error)

            else:
                return response

        except ValueError:
            print(error)


def rps_compare(user, comp):

    # if the user and the computer is the same, it's a tie
    if user == comp:
        round_result = "tie"

    # there are three ways to win
    elif user == "paper" and comp == "rock":
        round_result = 'win'
    elif user == "scissors" and comp == "paper":
        round_result = 'win'
    elif user == "rock" and comp == "scissors":
        round_result = 'win'
    # if it's not a win / tie, then it's a loss
    else:
        round_result = "lose"

    return round_result



# Main routine Stars here

# Intialise  game variables
mode = "regular"
round_played = 0
rounds_tied = 0
round_lost = 0

rps_list = ["rock", "paper", "scissors", "xxx"]
game_history = []

print("💎📝✂️Rock / Paper / Scissors Game ✂️📝💎")
print()


# ask the user if they want instructions (check they say yes / no)
want_instructions = string_checker("do you want to see the instructions? ")

# Display the instructions if the user wants to see them...
if want_instructions == "yes":
    instructions()


# Ask user for number of rounds / infinite mde
num_rounds = int_check("How many rounds would you like? Push <enter> for infinite mode: ")

if num_rounds == "infinite":
    mode = "infinite"
    num_rounds = 5


# Game loop starts here
while round_played < num_rounds:

    # Rounds headings
    if mode == "infinite":
        rounds_heading = f"\n∞ ∞ ∞ Round {round_played + 1} (infinite Mode) ∞ ∞ ∞"
    else:
        rounds_heading =f"\n💿💿💿 Round {round_played + 1} of {num_rounds} 💿💿💿"

    print(rounds_heading)

    # randomly choose from the rps list (excluding the exit code)
    comp_choice = random.choice(rps_list[:-1])
    print("Computer choice", comp_choice)


    user_choice = string_checker("Choose: ", rps_list)
    print("you chose", user_choice)

    if user_choice == "xxx":
        break

    result = rps_compare(user_choice, comp_choice)

    #Adjust game lost / game tied counters and add results to game history
    if result == "tie":
        rounds_tied += 1
        feedback = "👔👔It's a tie! 👔👔"
    elif result == "lose":
        round_lost += 1
        feedback = "😢😢 You lose. 😢😢"
    else:
        feedback = " 👍 👍 You won.  👍 👍"

    # set up round feedback and output it user
    # Add it to the game history list (include the round number)
    round_feedback = f"{user_choice} vs {comp_choice}, {feedback}"
    history_item = f"Round: {round_played} - {round_feedback}"

    print(round_feedback)
    game_history.append(history_item)

    round_played += 1

    # if users are in infinite mode, increase number of rounds!
    if mode == "infinite":
        num_rounds += 1


# Game History / Statistics area

if round_played > 0:
    # Calculate Statistics
    rounds_won = round_played - rounds_tied - round_lost
    percent_won = rounds_won / round_played * 100
    percent_lost = round_lost / round_played * 100
    percent_tied = 100 - percent_won - percent_lost

    # Output Game Statistics
    print("📊📊📊 Game Statistics 📊📊📊")
    print(f"👍 Won: {percent_won:.2f} \t "
          f"😢 Lost: {percent_lost:.2f} \t "
          f"👔 Tied: {percent_tied:.2f}")

    # ask user if they want to see their gam history and output it if requested.
    see_history = string_checker("\nDo you want to see your game history? ")
    if see_history == "yes":
        for item in game_history:
            print(item)

    print()
    print("Thanks for playing.")

else:
    # if the user plays infinite mode and
    # chickens out, we don't try to calculate the statistics.
    print("🐔🐔🐔 Oops - You chickened out! 🐔🐔🐔")