# -*- python -*-

# This example demonstrates how the currents settings
# can be read and transitioned from.


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 current colour curves
randr_get(0)()
r_, g_, b_ = r_curve[:], g_curve[:], b_curve[:]
start_over()


# Calculate divergence
temperature(temperature_to, lambda t : divide_by_maximum(cmf_10deg(t)))
f = lambda xy : abs(xy[0] - xy[1])
divergence = max([max(map(f, zip(x, y))) for x, y in curves(r_, g_, b_)])


# Get the end state colour curves
r, g, b = r_curve[:], g_curve[:], b_curve[:]


# Calculate transition time
fadein_time = divergence * 5
fadein_steps = fadein_time * 10

# Function for setting the colour temperature
def adjust(alpha):
    f = lambda on : on[0] * (1 - alpha) + on[1] * alpha
    ccc = curves((r_, r), (g_, g), (b_, b))
    ccc = [(out, list(map(f, zip(old, new)))) for out, (old, new) in ccc]
    for out, curve in ccc:
        out[:] = curve
    randr(0)

# Perform transition
if divergence and not panicgate:
    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)