from pydantic import BaseModel


class Belief(BaseModel):
    """
    Represents a single belief in the BDI system.

    :ivar name: The functor or name of the belief (e.g., 'user_said').
    :ivar arguments: A list of string arguments for the belief, or None if the belief has no
        arguments.
    """

    name: str
    arguments: list[str] | None


class BeliefMessage(BaseModel):
    """
    A container for communicating beliefs between agents.

    :ivar create: Beliefs to create.
    :ivar delete: Beliefs to delete.
    :ivar replace: Beliefs to replace. Deletes all beliefs with the same name, replacing them with
        one new belief.
    """

    create: list[Belief] = []
    delete: list[Belief] = []
    replace: list[Belief] = []

    def has_values(self) -> bool:
        return len(self.create) > 0 or len(self.delete) > 0 or len(self.replace) > 0