"""Host NeoPixel: keeps RGB buffer and notifies the GUI on `write()`."""

# Set by led-simulator main: callable(list[tuple[int,int,int]]) -> None
PIXEL_SINK = None


class NeoPixel:
    def __init__(self, pin, n):
        self.pin = pin
        self.n = n
        self._buf = [(0, 0, 0)] * n

    def __setitem__(self, index, value):
        if isinstance(value, (list, tuple)) and len(value) >= 3:
            r, g, b = (int(value[0]), int(value[1]), int(value[2]))
            self._buf[index] = (
                max(0, min(255, r)),
                max(0, min(255, g)),
                max(0, min(255, b)),
            )

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

    def fill(self, color):
        c = (0, 0, 0)
        if isinstance(color, (list, tuple)) and len(color) >= 3:
            c = (
                max(0, min(255, int(color[0]))),
                max(0, min(255, int(color[1]))),
                max(0, min(255, int(color[2]))),
            )
        self._buf = [c] * self.n

    def write(self):
        if PIXEL_SINK is not None:
            PIXEL_SINK(list(self._buf))