"""CircuitPython NeoPixel LED utility.

Uses the neopixel library and time.monotonic() to run breathing and rainbow animations.
"""

import math
import time
import neopixel

class BoardLED:
    def __init__(self, pin):
        # Initialize 1 NeoPixel on the specified pin
        self.np = neopixel.NeoPixel(pin, 1, brightness=1.0, auto_write=False)
        self.base_color = (0, 0, 0)
        self.off()

    def set_color(self, r, g, b):
        self.base_color = (r, g, b)
        self.np[0] = (r, g, b)
        self.np.show()

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

    def update_breathing(self, speed_factor=1.0):
        if self.base_color == (0, 0, 0):
            return
        t = time.monotonic() * speed_factor
        # Sine wave from 0.05 to 1.0
        factor = 0.525 + 0.475 * math.sin(t * math.pi)
        br = int(self.base_color[0] * factor)
        bg = int(self.base_color[1] * factor)
        bb = int(self.base_color[2] * factor)
        self.np[0] = (br, bg, bb)
        self.np.show()

    def update_rainbow(self, speed_factor=0.2):
        t = time.monotonic() * speed_factor
        r = int(127.5 * (1.0 + math.sin(t * 2.0 * math.pi)))
        g = int(127.5 * (1.0 + math.sin(t * 2.0 * math.pi + 2.0 * math.pi / 3.0)))
        b = int(127.5 * (1.0 + math.sin(t * 2.0 * math.pi + 4.0 * math.pi / 3.0)))
        self.np[0] = (r, g, b)
        self.np.show()