from __future__ import annotations

import argparse
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_near_size(model: StepModel, width: float, height: float, tolerance: float) -> int:
    for face_id in range(len(model.faces)):
        info = model.face_info(face_id)
        if info.get("surface") != "plane":
            continue
        face_width = float(info.get("local_face_width") or 0.0)
        face_height = float(info.get("local_face_height") or 0.0)
        direct = abs(face_width - width) <= tolerance and abs(face_height - height) <= tolerance
        swapped = abs(face_width - height) <= tolerance and abs(face_height - width) <= tolerance
        if direct or swapped:
            return face_id
    raise SystemExit(f"no plane Face near {width:g} x {height:g}")


def _plane_sizes(model: StepModel) -> list[tuple[float, float, float]]:
    sizes: list[tuple[float, float, float]] = []
    for face_id in range(len(model.faces)):
        info = model.face_info(face_id)
        if info.get("surface") != "plane":
            continue
        area = float(info.get("area") or 0.0)
        width = float(info.get("local_face_width") or 0.0)
        height = float(info.get("local_face_height") or 0.0)
        sizes.append((round(area, 6), round(width, 6), round(height, 6)))
    return sorted(sizes)


def _has_plane_size(model: StepModel, width: float, height: float, tolerance: float) -> bool:
    for _area, face_width, face_height in _plane_sizes(model):
        direct = abs(face_width - width) <= tolerance and abs(face_height - height) <= tolerance
        swapped = abs(face_width - height) <= tolerance and abs(face_height - width) <= tolerance
        if direct or swapped:
            return True
    return False


def main() -> int:
    parser = argparse.ArgumentParser(description="Verify Face resize semantics on the cube test model.")
    parser.add_argument("model", nargs="?", default=str(DEFAULT_MODEL), help="STEP model path.")
    parser.add_argument("--axis", default="width", choices=["width", "height"])
    parser.add_argument("--source-size", type=float, default=10.0)
    parser.add_argument("--other-size", type=float, default=10.0)
    parser.add_argument("--target-size", type=float, default=15.0)
    parser.add_argument("--strategy", default="local", choices=["local", "owning"])
    parser.add_argument("--tolerance", type=float, default=1e-5)
    args = parser.parse_args()

    model = StepModel.load(Path(args.model))
    face_id = _first_plane_face_near_size(model, args.source_size, args.other_size, args.tolerance)
    before = model.stats()

    if args.strategy == "local":
        plan = model.face_size_local_resize_plan(face_id, args.target_size, args.axis)
        result = model.resize_face_size_local(face_id, args.target_size, args.axis)
        expected_strategy = f"local-face-{args.axis}-only-deform"
    else:
        plan = model.face_size_owning_scale_plan(face_id, args.target_size, args.axis)
        result = model.resize_face_size_owning_scale(face_id, args.target_size, args.axis)
        expected_strategy = f"axis-scale-owning-shape-from-face-{args.axis}"

    resolved_strategy = str(plan.get("resize_strategy", ""))
    if resolved_strategy != expected_strategy:
        raise SystemExit(f"expected {expected_strategy}, got {resolved_strategy or '<none>'}")

    after = model.stats()
    if after.solids != before.solids:
        raise SystemExit(f"solid count changed: before={before.solids}, after={after.solids}")
    if after.faces < before.faces:
        raise SystemExit(f"face count decreased: before={before.faces}, after={after.faces}")

    width = args.target_size if args.axis == "width" else args.other_size
    height = args.other_size if args.axis == "width" else args.target_size
    if not _has_plane_size(model, width, height, args.tolerance):
        raise SystemExit(f"no resulting plane Face near {width:g} x {height:g}")

    print(f"model={Path(args.model)}")
    print(f"face_id={face_id}")
    print(f"strategy={args.strategy}")
    print(f"axis={args.axis}")
    print(f"resolved_strategy={resolved_strategy}")
    print(f"rebuild_mode={plan.get('owning_face_size_rebuild_mode', '')}")
    print(f"before={before}")
    print(f"after={after}")
    print(f"plane_sizes={_plane_sizes(model)}")
    print(result.encode("ascii", "backslashreplace").decode("ascii"))
    return 0


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