"""Build an Atari 7800 cartridge (.a78) from a conversion."""
from __future__ import annotations

import os

from .viewer import assemble

_EXTS = (".a78", ".bin")


def export_a78(conv, output_path, source_path=None, display="forever",
               seconds=0, video="ntsc"):
    if not output_path.lower().endswith(_EXTS):
        output_path += ".a78"
    title = os.path.splitext(os.path.basename(source_path or output_path))[0]
    rom = assemble.build_cart(bytes(conv.data), title=title)
    with open(output_path, "wb") as f:
        f.write(rom)
    return output_path