#!/usr/bin/env python3
import pathlib
import sys

import bpy


LIBRARY_NAME = "WebGapLibrary.blend"
OBJECT_NAME = "WebGapLibraryObject"


def reset() -> None:
    bpy.ops.wm.read_factory_settings(use_empty=True)


def create_source(path: pathlib.Path) -> None:
    reset()
    mesh = bpy.data.meshes.new("WebGapLibraryMesh")
    mesh.from_pydata([(-1.0, 0.0, 0.0), (1.0, 0.0, 0.0), (0.0, 1.0, 0.0)], [], [(0, 1, 2)])
    obj = bpy.data.objects.new(OBJECT_NAME, mesh)
    bpy.context.scene.collection.objects.link(obj)
    bpy.ops.wm.save_as_mainfile(filepath=str(path), check_existing=False, compress=True)


def create_fixture(output: pathlib.Path) -> None:
    source = output.with_name(LIBRARY_NAME)
    create_source(source)
    reset()
    with bpy.data.libraries.load(str(source), link=True) as (data_from, data_to):
        if OBJECT_NAME not in data_from.objects:
            raise RuntimeError("source object is missing")
        data_to.objects = [OBJECT_NAME]
    linked = data_to.objects[0]
    if linked is None:
        raise RuntimeError("linked object is missing")
    bpy.context.scene.collection.objects.link(linked)
    bpy.ops.wm.save_as_mainfile(filepath=str(output), check_existing=False, compress=True)


def main(output: pathlib.Path) -> None:
    output.parent.mkdir(parents=True, exist_ok=True)
    create_fixture(output.resolve())


if __name__ == "__main__":
    arguments = sys.argv[sys.argv.index("--") + 1 :]
    if len(arguments) != 1:
        raise SystemExit("usage: blender -b --python M16-GAP-00011.py -- OUTPUT")
    main(pathlib.Path(arguments[0]))