import utime


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

    def run(self, preset):
        """Blink pattern: toggles LEDs on/off using preset delay, cycling through colors."""
        # Use provided colors, or default to white if none
        colors = preset.c if preset.c else [(255, 255, 255)]
        color_index = 0
        state = True  # True = on, False = off
        last_update = utime.ticks_ms()

        while True:
            current_time = utime.ticks_ms()
            # Re-read delay each loop so live updates to preset.d take effect
            delay_ms = max(1, int(preset.d))
            if utime.ticks_diff(current_time, last_update) >= delay_ms:
                if state:
                    base_color = colors[color_index % len(colors)]
                    color = self.driver.apply_brightness(base_color, preset.b)
                    self.driver.fill(color)
                    # Advance to next color for the next "on" phase
                    color_index += 1
                else:
                    # "Off" phase: turn all LEDs off
                    self.driver.fill((0, 0, 0))
                state = not state
                last_update = current_time
            # Yield once per tick so other logic can run
            yield