"""One FBX per part into fbx/: the part at the origin, its moving rod (if any) as a child, its UCX boxes.
Settings as models/pressure-door/build/pd_export.py (Z up, -Y forward, metres)."""
import os
import json
import bpy


def run(out):
    folder = os.path.join(out, "fbx")
    os.makedirs(folder, exist_ok=True)
    roots = [o for o in bpy.data.objects if o.name.startswith("SM_Kit_") and o.parent is None]
    done = []
    for r in sorted(roots, key=lambda o: o.name):
        keep = r.location.copy()
        r.location = (0, 0, 0)
        group = [r] + [c for c in r.children_recursive]
        for o in bpy.context.view_layer.objects:
            o.select_set(o in group)
        bpy.context.view_layer.objects.active = r
        path = os.path.join(folder, r.name + ".fbx")
        bpy.ops.export_scene.fbx(filepath=path, use_selection=True, object_types={"MESH"}, use_mesh_modifiers=False,
                                 mesh_smooth_type="OFF", add_leaf_bones=False, bake_anim=False, axis_forward="-Y",
                                 axis_up="Z", global_scale=1.0, apply_unit_scale=True, apply_scale_options="FBX_SCALE_NONE",
                                 use_space_transform=True, bake_space_transform=False, path_mode="STRIP",
                                 use_metadata=False, use_tspace=True)
        r.location = keep
        done.append(dict(file=os.path.basename(path), objects=[o.name for o in group],
                         kb=round(os.path.getsize(path) / 1024)))
    with open(os.path.join(out, "fbx", "export_list.json"), "w") as f:
        json.dump(done, f, indent=1)
    print("EXPORT", len(done))