"""Shared fixtures.

Inc 0 binds no modelling API, so shapes for the tests are built the long way:
a compound assembled through BRep_Builder, and shapes read back from the
committed .brep fixtures (tests/data), which were produced by the *stock*
wheel — see tools/gen_fixtures.py.
"""

from __future__ import annotations

import io
import json
import pathlib

import pytest
from OCP.BinTools import BinTools
from OCP.TopoDS import TopoDS_Shape

DATA = pathlib.Path(__file__).parent / "data"


def load_brep(path: pathlib.Path) -> TopoDS_Shape:
    shape = TopoDS_Shape()
    with path.open("rb") as fh:
        BinTools.Read_s(shape, io.BytesIO(fh.read()))
    return shape


@pytest.fixture(scope="session")
def manifest() -> dict:
    path = DATA / "manifest.json"
    if not path.exists():
        pytest.skip("fixtures not generated — run tools/gen_fixtures.py")
    return json.loads(path.read_text())


@pytest.fixture(scope="session")
def fixture_shapes(manifest) -> dict[str, TopoDS_Shape]:
    return {name: load_brep(DATA / f"{name}.brep") for name in manifest["shapes"]}


@pytest.fixture
def a_face(fixture_shapes):
    """First face of the meshed box fixture."""
    from OCP.TopAbs import TopAbs_FACE
    from OCP.TopExp import TopExp
    from OCP.TopTools import TopTools_IndexedMapOfShape

    faces = TopTools_IndexedMapOfShape()
    TopExp.MapShapes_s(fixture_shapes["box_meshed"], TopAbs_FACE, faces)
    return faces.FindKey(1)