from enum import Enum


class Perm(Enum):
    DOC_ACL = 0b000000000001
    DOC_READ = 0b000000000010
    DOC_DELETE = 0b000000000100
    ROLE_ACL = 0b000000001000
    SUBJECT_NEW = 0b000000010000
    SUBJECT_DOWN = 0b000000100000
    SUBJECT_UP = 0b000001000000
    DOC_NEW = 0b000010000000
    ROLE_NEW = 0b000100000000
    ROLE_DOWN = 0b001000000000
    ROLE_UP = 0b010000000000
    ROLE_MOD = 0b100000000000

    @staticmethod
    def get_perm(bit_array: int):
        for perm in Perm:
            if bit_array == perm.value:
                return perm
        return None

    @staticmethod
    def get_int(perms):
        if isinstance(perms, list):
            return sum([p.value for p in perms if isinstance(p, Perm)])
        return perms.value if isinstance(perms, Perm) else 0

    @staticmethod
    def check_perm(perm, bit_array: int):
        return perm.value & bit_array == perm.value