"""Test pattern: strip i has (i+1) LEDs on at the start (indices 0..i) plus the midpoint LED on. 50% red."""

BRIGHTNESS = 0.50

RED = (255, 0, 0)


def _scale(color, factor):
    return tuple(int(c * factor) for c in color)


class Test:
    def __init__(self, driver):
        self.driver = driver

    def run(self, preset):
        strips = self.driver.strips
        red = _scale(RED, BRIGHTNESS)
        for strip_idx, strip in enumerate(strips):
            n = strip.num_leds
            mid = self.driver.strip_midpoints[strip_idx]  # from STRIP_CONFIG
            strip.fill((0, 0, 0))
            # First (strip_idx + 1) LEDs on: indices 0..strip_idx
            for i in range(min(strip_idx + 1, n)):
                strip.set(i, red)
            # Midpoint LED on
            strip.set(mid, red)
            strip.show()