from dataclasses import dataclass
from enum import auto, Enum
from typing import Any


class Datatype(Enum):
    NONE = auto()
    NULL = auto()
    COMMENT = auto()
    STRING = auto()
    INTEGER = auto()
    FLOAT = auto()
    COMPLEX = auto()


@dataclass
class Data:
    type: Datatype
    value: Any


@dataclass
class Variable:
    name: str
    type: Datatype
    value: Data

    def __setattr__(self, name, value):
        if name == "value" and isinstance(value, Data):
            if self.type == value.type:
                object.__setattr__(self, name, value)
            else:
                raise ValueError(
                    "Type inequality; cannot assign value of "
                    f"type {value.type} to variable of type {self.type}"
                )
        else:
            object.__setattr__(self, name, value)


NONE_TYPE = Variable(None, Datatype.NONE, None)

VAR_MATCH = {
    r"null": Datatype.NULL,
    r"\/\/.+": Datatype.COMMENT,
    r"\".+\"": Datatype.STRING,
    r"-?\d+\.?\d{0,}?\+\d+\.?\d{0,}?i": Datatype.COMPLEX,
    r"-?\d+\.\d{0,}": Datatype.FLOAT,
    r"-?\d+": Datatype.INTEGER,
}