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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 updateTable(trains):
    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")
    )
    
    return table

def alphabetToInt(alphabet):
    if alphabet == "A":
        return 0
    elif alphabet == "B":
        return 1
    elif alphabet == "C":
        return 2
    elif alphabet == "D":
        return 3
    elif alphabet == "E":
        return 4
    elif alphabet == "F":
        return 5
    elif alphabet == "G":
        return 6
    elif alphabet == "H":
        return 7
    else:
        return -1 # if the user input the alphabet is not in our seat, throw error

def templateSeats():
    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]

    return seats

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, trainsSeats, table, fareList):
    if choice == "1":
        os.system("cls")
        viewTrainSchedules(trains)
        return
    elif choice == "2":
        os.system("cls")
        bookTickets(trains, bookings, trainsSeats, table, fareList)
        return
    elif choice == "3":
        os.system("cls")
        viewBookings(bookings)
        return
    elif choice == "4":
        os.system("cls")
        cancelTickets(bookings, trainsSeats)
        return
    else:
        while choice not in ["1", "2", "3", "4"]:
            choice = input("Invalid input! (Press any key to try again) >>")

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

    # draw the view train schedules out
    print(updateTable(trains))
    
    input("\nPress any key to Main Menu >> ")
    os.system("cls")

# Li Hen
def bookTickets(trains, bookings, trainsSeats, table, fareList):
    totalGeneratedTicketID = 1

    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")
            return

        selectedTrain = None
        trainIndex = None  # Index of the selected train
        for no in range(len(trains)):
            if trains[no][0] == book:
                selectedTrain = trains[no][0]
                trainIndex = no
                break
        
        while not selectedTrain:
            book = input("Enter Train Number (101, 102, 103) to view seats, or 0 to exit >> ")
            if book == "0":
                os.system("cls")
                return
            
            selectedTrain = None
            trainIndex = None  # Index of the selected train
            for no in range(len(trains)):
                if trains[no][0] == book:
                    selectedTrain = trains[no][0]
                    trainIndex = no
                    break

        pax = 0
        while True:
            pax = input("How many people? >> ")

            if pax.isdigit() and 0 < int(pax) <= trains[trainIndex][4]:
                pax = int(pax)
                break
            else:
                print("Invalid input! The number must be between 1 and 32. Try again.")
                continue

        fare = fareList[trainIndex] * pax
        isBooked = False
        bookedSeats = []  # Keep track of seats booked in this session

        while pax > 0:
            refresh()
            print(tabulate([[f"\nHere are the available seats for {trains[trainIndex][1]} Express (Train No: {selectedTrain})"]], tablefmt="rounded_grid"))
            print()

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

            seatBelowTable = tabulate(
                trainsSeats[trainIndex][1],
                tablefmt="heavy_grid"
            )
            print(seatBelowTable)
            print(f"Total pax that haven't chosen a seat: {pax}")
            seatChoice = input("\nSelect a seat (e.g., A01, B04) per pax at a time, or 0 to exit >> ").upper()
            
            if seatChoice == "0":
                os.system("cls")
                return

            while len(seatChoice) != 3 or not seatChoice[1:].isdigit():
                seatChoice = input("Invalid format, select a seat (e.g., A01, B04) per pax at a time, or 0 to exit >> ").upper()

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

            row = int(seatChoice[-1]) - 1
            col = alphabetToInt(seatChoice[0])

            while row < 0 or row >= 4 or col == -1:
                seatChoice = input("Invalid format, the range is in between (A-H) and (01-04) >> ").upper()
                row = int(seatChoice[-1]) - 1
                col = alphabetToInt(seatChoice[0])

            if row < 2:  # Upper rows
                if trainsSeats[trainIndex][0][row][col] == "XXX":
                    input("The seat is already booked. Please choose another available seat.")
                    continue
                trainsSeats[trainIndex][0][row][col] = "XXX"
            else:  # Lower rows
                if trainsSeats[trainIndex][1][row - 2][col] == "XXX":
                    input("The seat is already booked. Please choose another available seat.")
                    continue
                trainsSeats[trainIndex][1][row - 2][col] = "XXX"

            bookedSeats.append((row, col))  # Track booked seat
            pax -= 1
            input(f"The seat {seatChoice} has been booked successfully.")
            isBooked = True
            
        ticketIDGenerator = random.randint(100,999)
        if pax == 0 and isBooked:
            print(f"Your total payment is: RM{fare} (RM{fareList[trainIndex]} per pax)")
            print()
            confirmation = input("Are you confirm with your booking seats? (Y/N) >> ").upper()

            while confirmation not in ["Y", "N", "YES", "NO"]:
                confirmation = input("Invalid input. Are you confirm with your booking seats? (Y/N) >> ").upper()

            if confirmation in ["Y", "YES"]:
                person = int(fare / fareList[trainIndex])

                print("\nGenerating your receipt (Ticket ID)...")
                ticketID = f"{trains[trainIndex][1]} Express {selectedTrain} - {int(fare / fareList[trainIndex])}{ticketIDGenerator}{totalGeneratedTicketID}"
                totalGeneratedTicketID += 1

                bookings.append(ticketID)
                trains[trainIndex][4] -= person
                print()

                print("Your receipt (Ticket ID) is generated successfully. Please head to 'View Bookings' to check your details.")
                input("Press any key to main menu >> ")
                return
            else:  # Cancel the booking
                print("Booking canceled. Reverting seat availability...")
                for seat in bookedSeats:
                    row, col = seat
                    if row < 2:
                        trainsSeats[trainIndex][0][row][col] = f"{chr(65 + col)}{str(row + 1).zfill(2)}"
                    else:
                        trainsSeats[trainIndex][1][row - 2][col] = f"{chr(65 + col)}{str(row + 1).zfill(2)}"
                input("Seats have been restored. Returning to the main menu. Press any key to continue >> ")
                os.system("cls")
                return

# 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(tabulate([["These are the detail(s) about your recent booking"]], tablefmt="rounded_grid"))

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

        # 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")

            refresh()
            print(tabulate([[f"Booking Details of {bookings[choice - 1]}"]], tablefmt="rounded_grid"))
            print()


            input("Press 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()}", 32, f"RM {fareList[0]}", "8.00am", "11.00am"],
                ["102", f"{tierList[1]}", f"{destinationRandomize()}", f"{destinationRandomize()}", 32, f"RM {fareList[1]}", "22.00pm", "23.00pm"],
                ["103", f"{tierList[2]}", f"{destinationRandomize()}", f"{destinationRandomize()}", 32, 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")
    )

    trainsSeats = [ templateSeats(), templateSeats(), templateSeats() ]

    bookings = []

    # main loop 
    while (True):
        
        drawMenu()

        choice = input("\nEnter your choice >> ")
        if choice == "1":
            os.system("cls")
            viewTrainSchedules(trains)
        elif choice == "2":
            os.system("cls")
            bookTickets(trains, bookings, trainsSeats, table, fareList)
        elif choice == "3":
            os.system("cls")
            viewBookings(bookings)
        elif choice == "4":
            os.system("cls")
            cancelTickets(bookings, trainsSeats)
        elif choice == "5":
            os.system("cls")
            refresh()
            print(tabulate([["Thanks for using our service, bye!"]], tablefmt="rounded_grid"))

# call the main() function
main()
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