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from tabulate import tabulate
import os
import random

# global variables
g_destinationList = ["Perlis", "Kedah", "Penang", "Perak", "Selangor", "Negeri Sembilan", "Melaka", "Johor", "Kelantan", "Terengganu", "Pahang"]

def refresh():
    print("\n\n\n\n\n\n\n\n\n\n")

def destinationRandomize():
    destination = random.choice(g_destinationList)
    g_destinationList.remove(destination)
    return destination

def fareRandomize():
    fare = random.randint(1,4)
    return fare * 50

def drawMenu():
    menuChoice = [ ["(1) View Train Schedules"],
                   ["(2) Book Tickets"],
                   ["(3) View Bookings"],
                   ["(4) Cancel Tickets"],
                   ["(5) Exit Program"]
                 ]
    menuTable = tabulate(
        menuChoice,
        tablefmt="fancy_grid",
        headers=["  Train Ticket System"]
    )
    
    refresh()
    print(menuTable)

def menuOptions(choice, trains, bookings, seats, table):
    if choice == "1":
        os.system("cls")
        viewTrainSchedules(table)
        return
    elif choice == "2":
        os.system("cls")
        bookTickets(trains, bookings, seats, table)
        return
    elif choice == "3":
        os.system("cls")
        viewBookings(bookings)
        return
    elif choice == "4":
        os.system("cls")
        cancelTickets(bookings, seats)
        return
    else:
        input("Invalid input! (Press any key to try again) >>")
        os.system("cls")
        return

# Yik Yang
def viewTrainSchedules(table):
    refresh()
    print(tabulate([["Train Schedules"]], tablefmt="rounded_grid"))
    print()

    # draw the view train schedules out
    while (True):
        print(table)
        break
    
    input("\nPress any key to Main Menu >> ")
    os.system("cls")

# Li Hen
def bookTickets(trains, bookings, seats, table):
     while (True):
        refresh()
        print(tabulate([["Available Trains to Book"]], tablefmt="rounded_grid"))
        print()
        print(table)

        book = input("\nEnter Train Number (101, 102, 103) to view seats, or 0 to exit >> ")
        if book == "0":
            os.system("cls")
            break
        
        selectedTrain = None
        for x in range(len(trains) - 1):
            if trains[x][0] == book:
                selectedTrain = trains[x][0]
                break 
        
        if not selectedTrain:
            input("\nInvalid Input. Please try again >> ")
            os.system("cls")
            continue
        
        os.system("cls")
        
        refresh()
        print(tabulate([[f"\nHere are the available seats for {trains[x][1]} Express (Train No: {selectedTrain})"]], tablefmt="rounded_grid"))
        print("\n")

        # draw the seats
        seatAboveTable = tabulate(
            seats[0],
            tablefmt="heavy_grid"
        )
        print(seatAboveTable)
        print("--> Walk way")

        seatBelowTable = tabulate(
            seats[1],
            tablefmt="heavy_grid"
        )
        print(seatBelowTable)
            
        seatChoice = input("\nSelect a seat (e.g., A01, B04), or 0 to exit >> ").upper()

        if seatChoice == "0":
            os.system("cls")
            break
        
        if not seatChoice:
            input("Something went wrong here, your seat selection might not be exist. >> ")
            os.system("cls")
            continue

        if len(seatChoice) < 3 or len(seatChoice) > 3:
            input("Something went wrong here, your seat selection might not be exist. >> ")
            os.system("cls")
            continue

        input("\nPress any key to Main Menu >> ")
        os.system("cls")    
     
# Malcolm
def viewBookings(bookings):
    while True:
        refresh()
        if not bookings:
            print(tabulate([["You don't have any booking yet."]], tablefmt="rounded_grid"))
            input("\nPress any key to Main Menu >> ")
            os.system("cls")
            return
        else:
            print("These are the ticket ID you had purchased.")

            for i in range(len(bookings)):
                print(f"-> ({i + 1}) {bookings[i]["Ticket ID"]}")

        # enter a Booking ID
        try:
            choice = int(input(f"\nInput 1 to {len(bookings)} to view corresponding details, or 0 to exit >> "))
        except ValueError:
            input("Invalid input, please try again >> ")
            os.system("cls")
            continue

        if choice == 0:
            os.system("cls")
            return

        # if input out of boundary, throw exception
        if choice > len(bookings):
            input(f"Invalid input, please input from 1 to {len(bookings)} >> ")
            os.system("cls")
            continue

        # Display the booking details if found
        else:
            os.system("cls")
            print("\n     Booking Details     ")
            print("_________________________\n\n")
            print(f"| {'Train No':<10} | {'Seat Class':<12} | {'Ticket ID':<15} |")
            print("-------------------------------------------------")
            print(f"| {bookings[choice - 1]['Train No']:<10} | {bookings[choice - 1]['Seat Class']:<12} | {bookings[choice - 1]['Ticket ID']:<15} |")
            input("\nPress any key to Main Menu >> ")
            os.system("cls")
            return

# Qinyi
def cancelTickets(bookings, seats):
    while True:
        refresh()
        print(tabulate([["Cancel Your Ticket(s) Here"]], tablefmt="rounded_grid"))

        if not bookings:
            print("You haven't purchased your ticket yet.")
            input("Enter any key to main menu >> ")
            os.system("cls")
            break
        else:
            print("Here is the ticket that you purchased.")
            print(f"(1) {bookings[0]["Ticket ID"]}")

        choice = input("Enter the number to cancel : ")

        if choice == "1":
            answer = input("Are you sure you want to cancel? (YES/NO) >> ").upper()

            if answer == "YES":
                input(f"Ticket ID {bookings[0]["Ticket ID"]} has been cancelled successfully.")
                del bookings[0]
                
                os.system("cls")
            elif answer == "NO":
                os.system("cls")

# main entry point of the program
def main():
    # declare variables here
    fareList = [fareRandomize(), fareRandomize(), fareRandomize()]
    tierList = ["Gold" , "Silver", "Platinum"]

    # check train tier list
    for i in range(len(fareList) - 1):
        if fareList[i] < 100:
            tierList[i] = "Silver"
        elif fareList[i] < 150:
            tierList[i] = "Gold"
        else:
            tierList[i] = "Platinum"


    trains = [  ["101", f"{tierList[0]}", f"{destinationRandomize()}", f"{destinationRandomize()}", 48, f"RM {fareList[0]}", "8.00am", "11.00am"],
                ["102", f"{tierList[1]}", f"{destinationRandomize()}", f"{destinationRandomize()}", 48, f"RM {fareList[1]}", "22.00pm", "23.00pm"],
                ["103", f"{tierList[2]}", f"{destinationRandomize()}", f"{destinationRandomize()}", 48, f"RM {fareList[2]}", "18.00pm", "20.00pm"]
             ]
    
    table = tabulate(
        trains,
        headers=["Train No", "Train Type", "Origin", "Destination", "Available Seat", "Fare/Pax", "Departure", "Arrival"],
        tablefmt="fancy_grid",
        numalign="right",
        colalign=("center", "center", "center", "center", "center", "center", "center")
    )


    bookings = []

    seatsAbove = [ ["A01", "B01", "C01", "D01", "E01", "F01", "G01", "H01"],
                   ["A02", "B02", "C02", "D02", "E02", "F02", "G02", "H02"]
                 ]
    seatsBelow = [ ["A03", "B03", "C03", "D03", "E03", "F03", "G03", "H03"],
                   ["A04", "B04", "C04", "D04", "E04", "F04", "G04", "H04"]
                 ]
    seats = [seatsAbove, seatsBelow]

    # main loop 
    while (True):
        
        drawMenu()

        choice = input("\nEnter your choice >> ")

        if choice == "5":
            os.system("cls")
            refresh()
            print(tabulate([["Thanks for using our service, bye!"]], tablefmt="rounded_grid"))
            break
        else:
            menuOptions(choice, trains, bookings, seats, table)

# call the main() function
main()
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