"""Amiga monochrome: 320x200, 16 grey levels (the Amiga has true 16 greys)."""
from __future__ import annotations

from ...convert.base import Conversion
from . import _common

WIDTH, HEIGHT = 320, 200
PIXEL_ASPECT = 1.0
NCOL = 16


def convert(img_rgb, palette_name="amiga", dither_mode="floyd",
            intensive=False, base_color=None):
    planes, colors, preview, err = _common.flat_encode(
        img_rgb, NCOL, dither_mode, mono=True, base_color=base_color)
    return Conversion(
        mode="mono", width=WIDTH, height=HEIGHT, pixel_aspect=PIXEL_ASPECT,
        index_image=None,
        data={"planes": planes, "colors": colors, "nplanes": 4, "ham": False},
        data_addr=0, viewer="amiga", preview_rgb=preview, error=err,
        meta={"palette": "amiga", "dither": dither_mode},
    )