"""Shared constants for ComfyUI-GameDev nodes."""


def _build_vga_256_palette():
    """Build VGA-256 palette using the same method as GlitchNodes Pixel8Bit.

    Palette recipe:
    - 6x6x6 RGB cube with levels {0, 51, 102, 153, 204, 255}
    - 40-step grayscale ramp across 0..255
    - Remove exact duplicates while preserving first occurrence order
    """
    levels = [0, 51, 102, 153, 204, 255]
    palette = []

    for r in levels:
        for g in levels:
            for b in levels:
                palette.append((r, g, b))

    for i in range(40):
        value = int(round((255.0 * i) / 39.0))
        palette.append((value, value, value))

    deduped = []
    seen = set()
    for color in palette:
        if color in seen:
            continue
        seen.add(color)
        deduped.append(color)

    return deduped


VGA_256_COLORS = _build_vga_256_palette()