"""CPC Mode 0: 160x200, 16 colours from the 27-colour palette (the flagship
photo mode -- wide pixels but the most colour)."""
from __future__ import annotations

from ...convert.base import Conversion, perceptual_error
from . import _common

WIDTH, HEIGHT = 160, 200
PIXEL_ASPECT = 2.0          # 160x200 on a 4:3 screen -> pixels twice as wide
NCOL = 16


def convert(img_rgb, palette_name="cpc", dither_mode="floyd",
            intensive=False, base_color=None):
    pen, inks, idx, img_lab, plab, prgb = _common.render(img_rgb, NCOL, dither_mode)
    screen = _common.PACK[0](pen)
    return Conversion(
        mode="mode0", width=WIDTH, height=HEIGHT, pixel_aspect=PIXEL_ASPECT,
        index_image=idx, data=screen, data_addr=0xC000, viewer="cpc",
        preview_rgb=prgb[idx], error=perceptual_error(idx, img_lab, plab),
        meta={"palette": "cpc", "dither": dither_mode, "cpc_mode": 0, "inks": inks},
    )