from abc import ABCMeta, abstractmethod

class Computer():
    _name = 'PC'
    
    def __init__(self, name):
        self._name = name
        
    def display(self):
        print(f'{self._name:>20}\n----------------------------------')
        print(f"{'Case':>15}: {self.case}")
        print(f"{'Mainboard':>15}: {self.mainboard}")
        print(f"{'CPU':>15}: {self.cpu}")
        print(f"{'Memory':>15}: {self.memory}")
        print(f"{'Hard Drive':>15}: {self.hard_drive}")
        print(f"{'Video Card':>15}: {self.video_card}\n")

class IComputerBuilder(metaclass=ABCMeta):
    def new_computer(self):
        self._computer = Computer(self._name)
    
    def get_computer(self):
        return self._computer
    
    @abstractmethod
    def build_mainboard(self):
        pass
    
    @abstractmethod
    def get_case(self):
        pass
    
    @abstractmethod
    def install_mainboard(self):
        pass
    
    @abstractmethod
    def install_hard_drive(self):
        pass
    
    @abstractmethod
    def install_video_card(self):
        pass

class GamingPCBuilder(IComputerBuilder):
    _name = 'Gaming PC'
    
    def get_case(self):
        self._computer.case = 'Coolermaster N300'
        
    def build_mainboard(self):
        self._computer.mainboard = 'MSI 970'
        self._computer.cpu = 'Intel Core i7840k'
        self._computer.memory = 'Corsair Vengeance 16GB'
        
    def install_mainboard(self):
        pass
    
    def install_hard_drive(self):
        self._computer.hard_drive = 'Seagate 2TB'
        
    def install_video_card(self):
        self._computer.video_card = 'GeForce GTX 1080 Ti'

class GenericPCBuilder(IComputerBuilder):
    _name = 'Generic PC'
    
    def get_case(self):
        self._computer.case = 'IN WIN BP655'
        
    def build_mainboard(self):
        self._computer.mainboard = 'ASRock AMIH-ITX'
        self._computer.cpu = 'AMD Athlon 5150'
        self._computer.memory = 'Kingston ValueRAM 4GB'
        
    def install_mainboard(self):
        pass
    
    def install_hard_drive(self):
        self._computer.hard_drive = 'WD Blue 1TB'
        
    def install_video_card(self):
        self._computer.video_card = 'On Board'

class ComputerBuilder():
    def __init__(self, builder):
        self._builder = builder
        
    def build_computer(self):
        self._builder.new_computer()
        self._builder.get_case()
        self._builder.build_mainboard()
        self._builder.install_mainboard()
        self._builder.install_hard_drive()
        self._builder.install_video_card()
        
    def get_computer(self):
        return self._builder.get_computer()