import bpy
import sys
import os

argv = sys.argv
argv = argv[argv.index("--") + 1:]

glb_input = argv[0]
obj_output = argv[1]


def clean():
    bpy.ops.object.select_all(action='SELECT')
    bpy.ops.object.delete(use_global=False)


clean()

bpy.ops.import_scene.gltf(filepath=glb_input)

meshes = [o for o in bpy.context.scene.objects if o.type == "MESH"]

if not meshes:
    raise RuntimeError("No mesh objects found in GLB/GLTF.")

bpy.ops.object.select_all(action='DESELECT')

for o in meshes:
    o.select_set(True)

bpy.context.view_layer.objects.active = meshes[0]

if len(meshes) > 1:
    bpy.ops.object.join()

obj = bpy.context.view_layer.objects.active
obj.select_set(True)

os.makedirs(os.path.dirname(obj_output), exist_ok=True)

bpy.ops.wm.obj_export(
    filepath=obj_output,
    export_selected_objects=True,
    export_normals=True,
    export_uv=True,
)

print("OBJ exported:", obj_output)