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

import bpy


OLD_ACTION = "WebGapAnimReplaceNewOldAction"


def make_object(name, action, values):
    mesh = bpy.data.meshes.new(f"{name}Mesh")
    mesh.from_pydata(
        [(-1.0, -1.0, 0.0), (1.0, -1.0, 0.0), (1.0, 1.0, 0.0), (-1.0, 1.0, 0.0)],
        [],
        [(0, 1, 2, 3)],
    )
    obj = bpy.data.objects.new(name, mesh)
    bpy.context.scene.collection.objects.link(obj)
    obj.animation_data_create()
    obj.animation_data.action = action
    for frame, value in zip((1, 3, 5), values):
        obj["replace_target"] = value
        obj.keyframe_insert(data_path='["replace_target"]', frame=frame)
    return obj


def main():
    arguments = sys.argv[sys.argv.index("--") + 1 :]
    if len(arguments) != 1:
        raise SystemExit("usage: blender -b --factory-startup --python M16-GAP-00203.py -- OUTPUT")
    bpy.ops.wm.read_factory_settings(use_empty=True)
    old_action = bpy.data.actions.new(OLD_ACTION)
    old_a = make_object("WebGapAnimReplaceNewOldA", old_action, (1.0, 3.0, 5.0))
    old_b = make_object("WebGapAnimReplaceNewOldB", old_action, (2.0, 4.0, 6.0))
    old_action.use_fake_user = True
    bpy.context.view_layer.objects.active = old_a
    old_a.select_set(True)
    old_b.select_set(False)
    bpy.context.scene.frame_start = 1
    bpy.context.scene.frame_end = 5
    bpy.context.scene.frame_set(3)
    bpy.ops.wm.save_as_mainfile(
        filepath=str(pathlib.Path(arguments[0]).resolve()), check_existing=False, compress=True
    )


if __name__ == "__main__":
    main()