"""TI-99/4A TMS9918A Video Display Processor palette (15 colours + transparent)."""

from __future__ import annotations

import numpy as np

from ..palette import srgb_to_lab

# TMS9918A colours, index 0 = transparent (we never use it for pixels).
# Common measured RGB values.
TMS9918 = np.array([
    (0x00, 0x00, 0x00),   # 0  transparent (treated as black for matching)
    (0x00, 0x00, 0x00),   # 1  black
    (0x21, 0xc8, 0x42),   # 2  medium green
    (0x5e, 0xdc, 0x78),   # 3  light green
    (0x54, 0x55, 0xed),   # 4  dark blue
    (0x7d, 0x76, 0xfc),   # 5  light blue
    (0xd4, 0x52, 0x4d),   # 6  dark red
    (0x42, 0xeb, 0xf5),   # 7  cyan
    (0xfc, 0x55, 0x54),   # 8  medium red
    (0xff, 0x79, 0x78),   # 9  light red
    (0xd4, 0xc1, 0x54),   # 10 dark yellow
    (0xe6, 0xce, 0x80),   # 11 light yellow
    (0x21, 0xb0, 0x3b),   # 12 dark green
    (0xc9, 0x5b, 0xba),   # 13 magenta
    (0xcc, 0xcc, 0xcc),   # 14 grey
    (0xff, 0xff, 0xff),   # 15 white
], dtype=np.float64)

# Palette indices usable as pixel colours (1..15).
USABLE = list(range(1, 16))


def get_palette() -> np.ndarray:
    return TMS9918


def palette_lab() -> np.ndarray:
    return srgb_to_lab(TMS9918)