import hyperion
import time
import colorsys

# Get the parameters
rotationTime = float(hyperion.args.get('rotation-time', 10.0))
color = hyperion.args.get('color', (255,0,0))
percentage = int(hyperion.args.get('percentage', 10))

# Check parameters
rotationTime = max(0.1, rotationTime)
percentage = max(1, min(percentage, 100))

# Initialize the led data
factor = float(percentage)/100.0
snakeLeds = int(hyperion.ledCount*factor)
ledData = bytearray()

for i in range(hyperion.ledCount-snakeLeds):
	ledData += bytearray((0, 0, 0))

for i in range(1, snakeLeds+1):
	hsv = colorsys.rgb_to_hsv(float(color[0])/float(255), float(color[1])/float(255), float(color[2])/float(255))
	rgb = colorsys.hsv_to_rgb(hsv[0], hsv[1], hsv[2]/float(snakeLeds+1-i))
	ledData += bytearray((int(rgb[0]*255), int(rgb[1]*255), int(rgb[2]*255)))

# Calculate the sleep time and rotation increment
increment = 3
sleepTime = rotationTime / hyperion.ledCount
while sleepTime < 0.05:
	increment *= 2
	sleepTime *= 2
increment %= hyperion.ledCount

# Start the write data loop
while not hyperion.abort():
	hyperion.setColor(ledData)
	ledData = ledData[-increment:] + ledData[:-increment]
	time.sleep(sleepTime)