# This file is part of the Glowtables software
# Copyright (C) 2023  Valentin Lorentz
#
# This program is free software: you can redistribute it and/or modify it under the
# terms of the GNU Affero General Public License version 3, as published by the
# Free Software Foundation.
#
# This program is distributed in the hope that it will be useful, but WITHOUT ANY
# WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
# PARTICULAR PURPOSE.  See the GNU Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License along with
# this program.  If not, see <http://www.gnu.org/licenses/>.

"""pytest fixtures"""

# pylint: disable=redefined-outer-name

from typing import Iterable

import pytest
import rdflib

from glowtables.sparql import SparqlBackend


class RdflibSparqlBackend(SparqlBackend):
    """Mock SPARQL backend that queries a local rdflib graph."""

    def __init__(self, graph: rdflib.Graph):
        self._graph = graph

    def query(self, query: str) -> Iterable[tuple]:
        ret = self._graph.query(query)
        return ret


@pytest.fixture()
def rdflib_graph() -> rdflib.Graph:
    """Returns an empty rdflib graph."""
    return rdflib.Graph()


@pytest.fixture()
def rdflib_sparql(rdflib_graph: rdflib.Graph) -> RdflibSparqlBackend:
    """Returns a SPARQL backend instance for ``rdflib_graph``."""
    return RdflibSparqlBackend(rdflib_graph)