"""Executed by Blender, never by Unreal. Export an evaluated, joined static mesh."""
import argparse
from pathlib import Path
import sys

import bpy


def main():
    parser = argparse.ArgumentParser()
    parser.add_argument("--output", required=True)
    parser.add_argument("--collection", default="Character")
    args = parser.parse_args(sys.argv[sys.argv.index("--") + 1:])
    collection = bpy.data.collections.get(args.collection)
    if collection is None:
        raise RuntimeError(f"Brak kolekcji {args.collection!r} w zapisanym pliku blend.")
    meshes = [obj for obj in collection.all_objects if obj.type == "MESH"]
    if not meshes:
        raise RuntimeError("Kolekcja Character nie zawiera siatek.")
    bpy.ops.object.select_all(action="DESELECT")
    depsgraph = bpy.context.evaluated_depsgraph_get()
    copies = []
    for obj in meshes:
        evaluated = obj.evaluated_get(depsgraph)
        data = bpy.data.meshes.new_from_object(evaluated, depsgraph=depsgraph)
        duplicate = bpy.data.objects.new(obj.name + "_export", data)
        bpy.context.scene.collection.objects.link(duplicate)
        duplicate.matrix_world = obj.matrix_world.copy()
        duplicate.select_set(True)
        copies.append(duplicate)
    bpy.context.view_layer.objects.active = copies[0]
    bpy.ops.object.join()
    joined = bpy.context.object
    joined.name = "Character"
    # Origin at world zero: stable pivot, independent of which body part is first.
    bpy.context.scene.cursor.location = (0, 0, 0)
    bpy.ops.object.origin_set(type="ORIGIN_CURSOR")
    output = Path(args.output).resolve()
    output.parent.mkdir(parents=True, exist_ok=True)
    bpy.ops.export_scene.gltf(filepath=str(output), export_format="GLB", use_selection=True,
                              export_animations=False, export_materials="EXPORT", export_yup=True)
    print("WORKSHOP_EXPORTED=" + str(output))


if __name__ == "__main__":
    main()