class MemoryManager:

    instance = None

    @staticmethod
    def get_instance():
        if MemoryManager.instance is None:
            MemoryManager.instance = MemoryManager()
        return MemoryManager.instance

    @staticmethod
    def count_cells():
        return len(MemoryManager.get_instance().cells)

    @staticmethod
    def count_reads():
        return sum([cell.read_count for cell in MemoryManager.get_instance().cells])

    @staticmethod
    def count_writes():
        return sum([cell.write_count for cell in MemoryManager.get_instance().cells])

    @staticmethod
    def count_compares():
        return sum([cell.compare_count for cell in MemoryManager.get_instance().cells])

    @staticmethod
    def count_adds():
        return sum([cell.add_count for cell in MemoryManager.get_instance().cells])

    @staticmethod
    def count_subs():
        return sum([cell.sub_count for cell in MemoryManager.get_instance().cells])

    @staticmethod
    def count_muls():
        return sum([cell.mul_count for cell in MemoryManager.get_instance().cells])

    @staticmethod
    def count_divs():
        return sum([cell.div_count for cell in MemoryManager.get_instance().cells])

    @staticmethod
    def count_bitops():
        return sum([cell.bitop_count for cell in MemoryManager.get_instance().cells])

    @staticmethod
    def reset():
        manager = MemoryManager.get_instance()
        for cell in manager.cells:
            cell.reset_counters

    @staticmethod
    def print_statistics():
        print(f"Anzahl der Speicherzellen: {MemoryManager.count_cells()}")
        print(f"Anzahl der Lesezugriffe: {MemoryManager.count_reads()}")
        print(f"Anzahl der Schreibzugriffe: {MemoryManager.count_writes()}")
        print(f"Anzahl der Vergleiche: {MemoryManager.count_compares()}")

    def __init__(self):
        self.cells = []

    def add_cell(self, cell):
        self.cells.append(cell)