"""Minimal Presets-like stub for pattern smoke tests (no machine / NeoPixel)."""


class _FakeNeo:
    def __init__(self, count):
        self._count = count
        self.pixels = [(0, 0, 0)] * count

    def fill(self, color):
        self.pixels = [tuple(color) for _ in range(self._count)]

    def __setitem__(self, index, value):
        self.pixels[index] = tuple(value)

    def __getitem__(self, index):
        return self.pixels[index]

    def write(self):
        pass


class FakePresets:
    """Subset of led-driver Presets API used by patterns/*.py."""

    def __init__(self, num_leds=24):
        self.num_leds = num_leds
        self.n = _FakeNeo(num_leds)
        self.b = 255
        self.step = 0

    def apply_brightness(self, color, brightness_override=None):
        local = brightness_override if brightness_override is not None else 255
        effective_brightness = int(local * self.b / 255)
        return tuple(int(c * effective_brightness / 255) for c in color)

    def fill(self, color=None):
        fill_color = color if color is not None else (0, 0, 0)
        for i in range(self.num_leds):
            self.n[i] = fill_color
        self.n.write()

    def off(self):
        self.fill((0, 0, 0))