# -*- python -*-

# This example demonstrates how settings can be stored
# and be transition from later.

import os
import time


uses_adhoc_opts = True
'''
:bool  `True` if the configuration script parses the ad-hoc settings
'''


# Get --temperature from Blueshift ad-hoc settigns
temperature_to = int(parser.opts['--temperature'][0])

# Get old temperature setting
temperature_from = 6500
storage_file = '/dev/shm/.blueshift-conf-%s-%s' % (os.environ['DISPLAY'], os.environ['USER'])
if os.path.exists(storage_file):
    with open(storage_file, 'rb') as file:
        temperature_from = int(file.read().decode('utf-8', 'replace').split('\n')[0])

# Store new temperature
with open(storage_file, 'wb') as file:
    file.write(str(temperature_to).encode('utf-8'))
    file.flush()

# Calculate transition time
fadein_time = abs(temperature_to - temperature_from) * 5 / (6500 - 3700)
fadein_steps = fadein_time * 10

# Function for setting the colour temperature
def adjust(alpha):
    temp = temperature_to * alpha + temperature_from * (1 - alpha)
    start_over()
    temperature(temp, lambda t : divide_by_maximum(cmf_10deg(t)))
    randr(0)

# Perform transition
if not (panicgate or temperature_to == temperature_from):
    signal.signal(signal.SIGTERM, signal_SIGTERM)
    dtime = fadein_time / fadein_steps
    df = 1 / fadein_steps
    trans = 0
    while running:
        try:
            trans += df
            if trans > 1:
                break
            adjust(trans)
            time.sleep(dtime)
        except KeyboardInterrupt:
            running = False
adjust(1)