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

def main(output):
    bpy.ops.wm.read_factory_settings(use_empty=True)
    legacy = bpy.data.curves.new("WebGapCurvesSeed", "CURVE")
    legacy.dimensions = "3D"
    spline = legacy.splines.new("BEZIER")
    spline.bezier_points.add(3)
    for point, co in zip(spline.bezier_points, ((-1.5, 0, 0), (-0.5, 0.3, 0.5), (0.5, 0, 0), (1.5, 0.3, 0.5))):
        point.co = co
        point.handle_left_type = "AUTO"
        point.handle_right_type = "AUTO"
    object_ = bpy.data.objects.new("WebGapCurvesObject", legacy)
    bpy.context.collection.objects.link(object_)
    bpy.context.view_layer.objects.active = object_
    object_.select_set(True)
    bpy.ops.object.convert(target="CURVES")
    if legacy != object_.data: bpy.data.curves.remove(legacy, do_unlink=True)
    object_.data.name = "WebGapCurves"
    radius = object_.data.attributes.get("radius") or object_.data.attributes.new("radius", "FLOAT", "POINT")
    for index, item in enumerate(radius.data): item.value = 0.03 + index * 0.005
    bpy.ops.wm.save_as_mainfile(filepath=output, compress=True)

if __name__ == "__main__":
    args = sys.argv[sys.argv.index("--") + 1:]
    if len(args) != 1: raise SystemExit("usage: blender -b --python generate-curves-fixture.py -- OUTPUT")
    main(args[0])