class Seat():
    def __init__(self):
        self.letter = "A"
        self.available = True
        self.studID = None
    def setLetter(self, letter):
        self.letter = letter
        pass

    def checkAvailable(self):
        return self.available
        pass

    def enterStudent(self, studID):
        self.studID = studID
        self.available = False
        pass

    def exitStudent(self):
        self.studID = None
        self.available = True
        pass


    def showinfo(self):
        print(f'\nseat: {self.letter}')
        print(f'availability: {self.checkAvailable()}')
        if self.available:
            print(f'Student residing: {self.studID}')




class Room():
    def __init__(self):
        self.roomNo = "###"
        self.seats = list()
        seatA = Seat()
        seatA.setLetter('A')
        self.seats.append(seatA)

        seatB = Seat()
        seatB.setLetter('B')
        self.seats.append(seatB)


    def setNumber(self, number):
        self.roomNo = number
        if self.roomNo in (501, 502, 504):
            seatC = Seat()
            seatC.setLetter('C')
            self.seats.append(seatC)

            seatD = Seat()
            seatD.setLetter('D')
            self.seats.append(seatD)

        pass

    def showEnf(self):
        print(f'\nRoom No. {self.roomNo}')
        print(f'availability: {self.checkAvailable()}')
        for i in self.seats:
            i.showinfo()
            pass
        pass

    def checkAvailable(self):
        for i in self.seats:
            if i.checkAvailable():
                return i.checkAvailable()
            pass

        return False





    pass

listOfRooms = list()

for i in range(4):
    roomm = Room()
    roomm.setNumber((i+501))
    listOfRooms.append(roomm)
    del roomm
    pass
# rooms ready {501,502,503,504}
'''
for i in listOfRooms:
    i.showEnf()
    pass
'''
while True:
    print('\nWhat action do you want to do?')
    print('1. assign a seat to a student')
    print('2. change the seat of a student')
    print('3. cancel seat of a student')
    print('4. find student at a certain seat')
    print('5. exit')
    choice = int(input())
    ##1. The user will assign the seat number according to the student ID and before
    #assigning the seat, the user should check whether this room is available or not.
    if choice == 1:
        for ru in listOfRooms:
            if ru.checkAvailable():
                print(f"roomNo. {ru.roomNo} is available")
                studID = input("Enter the ID of the student: ")
                for sit in ru.seats:
                    if sit.checkAvailable():
                        sit.enterStudent(studID)
                        pass
                    break
                break

            pass

        else:
            print("Hall is full! Can't enter student")
            pass

        pass
    if choice == 5:
        exit(0)
        break


    pass