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

import bpy


ACTIVE_OBJECT = "WebGapAnimMergeActiveObject"
SOURCE_OBJECT = "WebGapAnimMergeSourceObject"
ACTIVE_ACTION = "WebGapAnimMergeActiveAction"
SOURCE_ACTION = "WebGapAnimMergeSourceAction"


def make_object(name, prop_name, action_name, 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[prop_name] = values[1]
    for frame, value in zip((1, 3, 5), values):
        bpy.context.scene.frame_set(frame)
        obj[prop_name] = value
        obj.keyframe_insert(data_path=f'["{prop_name}"]', frame=frame)
    obj.animation_data.action.name = action_name
    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-00198.py -- OUTPUT")
    bpy.ops.wm.read_factory_settings(use_empty=True)
    active = make_object(ACTIVE_OBJECT, "active_merge_target", ACTIVE_ACTION, (1.0, 3.0, 5.0))
    source = make_object(SOURCE_OBJECT, "source_merge_target", SOURCE_ACTION, (10.0, 30.0, 50.0))
    bpy.context.view_layer.objects.active = active
    active.select_set(True)
    source.select_set(True)
    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()