#
# This file is distributed under the MIT License. See LICENSE.md for details.
#

from typing import Optional

from revng.pypeline.model import ReadOnlyModel
from revng.pypeline.object import Kind, ObjectID, ObjectSet
from revng.pypeline.utils.registry import get_singleton

from .exceptions import MalformedRequestError

Epoch = int


def compute_objects(
    model: ReadOnlyModel,
    kind: Kind,
    objects: Optional[list[str]],
) -> ObjectSet:
    """
    If objects is not None, deserialize all objects, otherwise return all the objects producible of
    the given Kind.
    """
    # If the user did not provide any objects for this container,
    # we will use all objects of the given kind from the model.
    if objects is None or len(objects) == 0:
        return model.all_objects(kind)
    # Otherwise we have to parse the objects provided by the user.

    # Parse the objects into ObjectSet
    obj_type = get_singleton(ObjectID)  # type: ignore [type-abstract]
    objset = set()
    for obj in objects:
        if not isinstance(obj, str):
            raise MalformedRequestError(f'Object "{obj}" must be a string, got "{type(obj)}"')

        # Deserialize the object ID
        try:
            obj_id = obj_type.deserialize(obj)
        except ValueError as e:
            raise MalformedRequestError(f'Invalid object ID "{obj}": {e}')

        objset.add(obj_id)

    return ObjectSet(kind, objset)