# Based on NeoPixel library and strandtest example by Tony DiCola (tony@tonydicola.com)
# To be used with a 12x1 NeoPixel LED stripe.
# Place the LEDs in a circle an watch the time go by ...
# red = hours
# blue = minutes 1-5
# green = seconds
# (To run the program permanently and with autostart use systemd.)

import time
import datetime
import math
from sys import argv

from neopixel import *

# LED strip configuration:
LED_COUNT = 120      # Number of LED pixels.
LED_PIN = 18      # GPIO pin connected to the pixels (must support PWM!).
LED_FREQ_HZ = 800000  # LED signal frequency in hertz (usually 800khz)
LED_DMA = 5       # DMA channel to use for generating signal (try 5)
LED_BRIGHTNESS = 255  # Set to 0 for darkest and 255 for brightest
# True to invert the signal (when using NPN transistor level shift)
LED_INVERT = False


def colorWipe(strip, color, wait_ms=50):
    """Wipe color across display a pixel at a time."""
    for i in range(strip.numPixels()):
        strip.setPixelColor(i, color)
        strip.show()
        time.sleep(wait_ms/1000.0)

def theaterChase(strip, color, wait_ms=50, iterations=10):
    """Movie theater light style chaser animation."""
    for j in range(iterations):
        for q in range(3):
            for i in range(0, strip.numPixels(), 3):
                strip.setPixelColor(i+q, color)
            strip.show()
            time.sleep(wait_ms/1000.0)
            for i in range(0, strip.numPixels(), 3):
                strip.setPixelColor(i+q, 0)

def wheel(pos):
    """Generate rainbow colors across 0-255 positions."""
    if pos < 85:
        return Color(pos * 3, 255 - pos * 3, 0)
    elif pos < 170:
        pos -= 85
        return Color(255 - pos * 3, 0, pos * 3)
    else:
        pos -= 170
        return Color(0, pos * 3, 255 - pos * 3)

def rainbow(strip, wait_ms=20, iterations=1):
    """Draw rainbow that fades across all pixels at once."""
    for j in range(256*iterations):
        for i in range(strip.numPixels()):
            strip.setPixelColor(i, wheel((i+j) & 255))
        strip.show()
        time.sleep(wait_ms/1000.0)

def rainbowCycle(strip, wait_ms=20, iterations=5):
    """Draw rainbow that uniformly distributes itself across all pixels."""
    for j in range(256*iterations):
        for i in range(strip.numPixels()):
            strip.setPixelColor(i, wheel((int(i * 256 / strip.numPixels()) + j) & 255))
        strip.show()
        time.sleep(wait_ms/1000.0)

def theaterChaseRainbow(strip, wait_ms=50):
    """Rainbow movie theater light style chaser animation."""
    for j in range(256):
        for q in range(3):
            for i in range(0, strip.numPixels(), 2):
                strip.setPixelColor(i+q, wheel((i+j) % 255))
            strip.show()
            time.sleep(wait_ms/1000.0)
            for i in range(0, strip.numPixels(), 2):
                strip.setPixelColor(i+q, 0)

if __name__ == '__main__':
    # Create NeoPixel object with appropriate configuration.
    strip = Adafruit_NeoPixel(
        LED_COUNT, LED_PIN, LED_FREQ_HZ, LED_DMA, LED_INVERT, LED_BRIGHTNESS)
    # Intialize the library (must be called once before other functions).
    strip.begin()

    if argv[-1] == 'on':
        for lvl in range(210):
            for i in range(strip.numPixels()):
                strip.setPixelColor(i, Color(lvl, lvl, lvl))
            strip.show()
            time.sleep(0.01)
    elif argv[-1] == 'off':
        for lvl in reversed(range(210)):
            for i in range(strip.numPixels()):
                strip.setPixelColor(i, Color(lvl, lvl, lvl))
            strip.show()
            time.sleep(0.01)
    else:
        rainbow(strip, wait_ms=5, iterations=1000)
