from __future__ import annotations

from pathlib import Path
import sys

PROJECT_ROOT = Path(__file__).resolve().parent.parent
if str(PROJECT_ROOT) not in sys.path:
    sys.path.insert(0, str(PROJECT_ROOT))

from step_editor.model import StepModel


DEFAULT_MODEL = PROJECT_ROOT / "assets" / "models" / "cube_10mm.step"


def _first_plane_face(model: StepModel) -> int:
    for face_id in range(len(model.faces)):
        info = model.face_info(face_id)
        if info.get("surface") == "plane":
            return face_id
    raise SystemExit("no plane Face found")


def _assert_plan(label: str, plan: dict[str, object], status: str, risk: str | None = None) -> None:
    actual_status = str(plan.get("status", ""))
    actual_risk = str(plan.get("risk", ""))
    if actual_status != status:
        raise SystemExit(f"{label} expected status={status}, got {actual_status}: {plan}")
    if risk is not None and actual_risk != risk:
        raise SystemExit(f"{label} expected risk={risk}, got {actual_risk}: {plan}")


def main() -> int:
    model = StepModel.load(DEFAULT_MODEL)
    face_id = _first_plane_face(model)

    shallow = model.push_pull_plan(face_id, -1.0)
    _assert_plan("shallow inward cut", shallow, "ready", "low")
    if abs(float(shallow.get("push_pull_inward_material_depth") or 0.0) - 10.0) > 1e-5:
        raise SystemExit(f"shallow cut should report 10mm inward material depth: {shallow}")
    if abs(float(shallow.get("push_pull_inward_cut_ratio") or 0.0) - 0.1) > 1e-5:
        raise SystemExit(f"shallow cut should report 0.1 inward cut ratio: {shallow}")

    near_through = model.push_pull_plan(face_id, -9.0)
    _assert_plan("near-through inward cut", near_through, "caution", "high")
    if float(near_through.get("push_pull_inward_cut_ratio") or 0.0) < 0.85:
        raise SystemExit(f"near-through cut should report a high inward cut ratio: {near_through}")

    through = model.push_pull_plan(face_id, -10.0)
    _assert_plan("through inward cut", through, "blocked", "blocked")
    message = str(through.get("message") or through.get("blockers") or "")
    if "材料厚度" not in message and "切空" not in message:
        raise SystemExit(f"through cut blocker should explain material depth: {through}")
    try:
        model.push_pull_face(face_id, -10.0)
    except ValueError:
        pass
    else:
        raise SystemExit("push_pull_face should reject an inward cut that reaches full material depth")

    print("Face push/pull limit guards ok")
    return 0


if __name__ == "__main__":
    raise SystemExit(main())