import sys

import bpy


def add_mesh(name, vertices, faces):
    mesh = bpy.data.meshes.new(name)
    mesh.from_pydata(vertices, [], faces)
    mesh.update()
    obj = bpy.data.objects.new(name + "Object", mesh)
    bpy.context.collection.objects.link(obj)
    return obj


def main(output_path: str) -> None:
    bpy.ops.wm.read_factory_settings(use_empty=True)
    add_mesh("OpenQuad", [(-1, -1, 0), (1, -1, 0), (1, 1, 0), (-1, 1, 0)], [(0, 1, 2, 3)])
    add_mesh("OpenNgon", [(0, 1, 0), (1, 0.3, 0), (0.6, -1, 0), (-0.6, -1, 0), (-1, 0.3, 0)], [(0, 1, 2, 3, 4)])
    add_mesh("NonManifold", [(0, 0, 0), (1, 0, 0), (0, 1, 0), (0, 0, 1), (0, -1, 0)], [(0, 1, 2), (0, 3, 1), (0, 1, 4)])
    bpy.ops.wm.save_as_mainfile(filepath=output_path, compress=True)


if __name__ == "__main__":
    if "--" not in sys.argv or len(sys.argv) <= sys.argv.index("--") + 1:
        raise SystemExit("usage: blender -b --python generate-topology-fixture.py -- output.blend")
    main(sys.argv[sys.argv.index("--") + 1])