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

    def __str__(self):
        bit = 0
        value = self.value
        while not value & 0b1:
            bit += 1
            value >>= 1
        return f"{self.name}({bit})"

    @staticmethod
    def from_str(perm_name):
        for perm in Perm:
            if perm.name == perm_name:
                return perm

    @staticmethod
    def get_perms(bit_array: int, return_str=False):
        perms = []
        bit = 0b1
        for perm in Perm:
            if (bit_array & bit) == (perm.value & 0b1):
                perms.append(perm)
            bit >>= 1
        return [str(p) for p in perms] if return_str else perms

    @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(perms_array: int, perm_to_check: int):
        return perms_array & perm_to_check == perm_to_check

class PermOperation(Enum):
    ADD = 0
    REMOVE = 1

    @staticmethod
    def calc(bit_array: int, perm: Perm, operation) -> int:
        if operation == PermOperation.ADD:
            return bit_array | perm.value
        return bit_array & ~perm.value