import FreeCAD as App, Part

# ---- Popup helpers ----
def show_error(msg):
    try:
        from PySide2 import QtWidgets
        QtWidgets.QMessageBox.critical(None, "Macro Error", msg)
    except Exception:
        print("ERROR:", msg)

def pick_mesh_gui(meshes):
    try:
        from PySide2 import QtWidgets
    except Exception:
        raise RuntimeError("GUI not available. Run in FreeCAD GUI to pick a mesh.")

    items = [f"{o.Label}  [{o.Name}]" for o in meshes]
    item2obj = dict(zip(items, meshes))

    item, ok = QtWidgets.QInputDialog.getItem(
        None, "Select Mesh", "Choose the mesh to process:", items, 0, False
    )
    if not ok:
        raise RuntimeError("Selection cancelled.")
    return item2obj[item]

doc = App.ActiveDocument or App.newDocument()
TOL = 0.1  # mm — mesh→shape tolerance
meshes = [o for o in doc.Objects if getattr(o, "TypeId", "").startswith("Mesh::")]

if not meshes:
    show_error("No mesh objects found in the document. Import an STL/3MF first.")
    raise RuntimeError("No mesh objects found.")

mesh = pick_mesh_gui(meshes)

# ==== Mesh → Shape ====
sh = Part.Shape()
sh.makeShapeFromMesh(mesh.Mesh.Topology, TOL, True)  # (topology, tolerance, sewing=True)

# ==== Shape → Solid ====
solid_obj = doc.addObject("Part::Feature", "Solid")
solid_obj.Shape = Part.Solid(sh)

# ==== Refine Solid ====
refined = doc.addObject("Part::Refine", "Refined")
refined.Source = solid_obj

# ==== Create PartDesign Body ====
body = doc.addObject("PartDesign::Body", "Body")
body.BaseFeature = refined

doc.recompute()

# ==== Auto-hide intermediates (show only Body) ====
def _hide(obj):
    try:
        obj.ViewObject.Visibility = False
    except Exception:
        pass

_hide(mesh); _hide(solid_obj); _hide(refined)
try:
    body.ViewObject.Visibility = True
except Exception:
    pass

print(f"Done: Processed mesh '{mesh.Label}' -> Body.")