"""Apple IIGS SHR monochrome: 320x200 with a single 16-level grey palette (the
richest greyscale in lenser).  ``--mono-base`` tints the ramp toward a colour."""
from __future__ import annotations

from ...convert.base import Conversion
from ...palette import get_palette
from . import _common

WIDTH, HEIGHT = 320, 200
PIXEL_ASPECT = 1.0


def convert(img_rgb, palette_name="iigs", dither_mode="floyd",
            intensive=False, base_color=None):
    base_rgb = None
    if isinstance(base_color, int) and 0 <= base_color < 16:
        base_rgb = get_palette("colodore")[base_color]      # tint hue from C64 pal
    block, preview, err = _common.encode(img_rgb, dither_mode, mono=True,
                                         base_color=base_rgb)
    return Conversion(
        mode="mono", width=WIDTH, height=HEIGHT, pixel_aspect=PIXEL_ASPECT,
        index_image=None, data=block, data_addr=0x2000, viewer="iigs",
        preview_rgb=preview, error=err,
        meta={"palette": "iigs", "dither": dither_mode},
    )