"""Build a BBC Micro DFS disk (.ssd) from a conversion."""
from __future__ import annotations

from . import ssd
from .viewer.assemble import LOAD_ADDR, build_viewer


def export_ssd(conv, output_path, source_path=None, display="forever",
               seconds=0, video="pal") -> str:
    """Two DFS files: the !BOOT loader (sets mode + palette, *LOADs IMG) and the
    IMG screen data.  Boot option 2 (*RUN !BOOT) so SHIFT+BREAK autostarts it."""
    if not output_path.lower().endswith(".ssd"):
        output_path += ".ssd"
    m = conv.meta
    viewer = build_viewer(m["bbc_mode"], m["ncol"], m["physicals"], m["base"],
                          display=display, seconds=seconds, video=video)
    # !BOOT autostarts on SHIFT+BREAK (real hardware); PIC is the same loader
    # under a name with no '!' so it can be *RUN from a command line / emulator.
    files = [
        ("!BOOT", LOAD_ADDR, LOAD_ADDR, viewer),
        ("PIC", LOAD_ADDR, LOAD_ADDR, viewer),
        ("IMG", m["base"], m["base"], conv.data),
    ]
    return ssd.write_ssd(output_path, files, title="8BITLENSER", boot_option=2)