import pathlib
import sys

import bpy


def main() -> None:
    if "--" not in sys.argv or len(sys.argv[sys.argv.index("--") + 1 :]) != 2:
        raise SystemExit("usage: blender --background --factory-startup --python generate-asset-preview-identity.py -- INPUT OUTPUT")
    source_arg, output_arg = sys.argv[sys.argv.index("--") + 1 :]
    source = pathlib.Path(source_arg).resolve()
    output = pathlib.Path(output_arg).resolve()
    output.parent.mkdir(parents=True, exist_ok=True)

    image = bpy.data.images.load(str(source), check_existing=False)
    width, height = image.size[:]
    scene = bpy.context.scene
    scene.render.image_settings.file_format = "PNG"
    scene.render.image_settings.color_mode = "RGBA"
    scene.render.image_settings.color_depth = "8"
    scene.render.image_settings.compression = 0
    scene.display_settings.display_device = "sRGB"
    scene.view_settings.view_transform = "Standard"
    scene.view_settings.look = "None"
    scene.view_settings.exposure = 0
    scene.view_settings.gamma = 1
    image.save_render(str(output), scene=scene)
    if not output.is_file() or output.stat().st_size == 0:
        raise RuntimeError("asset preview output was not written")
    print(f"asset-preview-generated width={width} height={height} output={output}")


main()