"""Mattel Intellivision STIC 16-colour palette (MAME `intv` values).

Verified against MAME pixel reads (white=7 #FFFCFF, brown/olive=11 #546E00,
magenta=15 #B51A58).  In Color-Stack mode the per-card FOREGROUND is limited to
the first 8 colours (3 bits); the BACKGROUND (colour-stack entry) may be any of
the 16.
"""

from __future__ import annotations

import numpy as np

from ..palette import srgb_to_lab

STIC = np.array([
    (0x00, 0x00, 0x00),   # 0  black
    (0x00, 0x2D, 0xFF),   # 1  blue
    (0xFF, 0x3D, 0x10),   # 2  red
    (0xC9, 0xCF, 0xAB),   # 3  tan
    (0x38, 0x6B, 0x3F),   # 4  dark green
    (0x00, 0xA7, 0x56),   # 5  green
    (0xFA, 0xEA, 0x50),   # 6  yellow
    (0xFF, 0xFC, 0xFF),   # 7  white
    (0xBD, 0xAC, 0xC8),   # 8  grey
    (0x24, 0xB8, 0xFF),   # 9  cyan
    (0xFF, 0xB4, 0x1F),   # 10 orange
    (0x54, 0x6E, 0x00),   # 11 brown / olive
    (0xFF, 0x4E, 0x57),   # 12 pink
    (0xA4, 0x96, 0xFF),   # 13 light blue
    (0x75, 0xCC, 0x80),   # 14 yellow-green
    (0xB5, 0x1A, 0x58),   # 15 magenta
], dtype=np.float64)

# Foreground colours usable per card in Color-Stack mode (3-bit field).
FG_USABLE = list(range(8))
# Background (colour-stack) may be any of the 16.
BG_USABLE = list(range(16))


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


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