#!/usr/bin/python3
import os
import string
import subprocess
import sys
import time

import ox
import sacn

from .pi import random
from . import config


# Screen 1-5, Control, 6,7
'''
> 
    _*10 patterns / cues that correspond to 10 digit:*_
    0 = Cue list 1 = 1x flash (on, off)
    1 = Cue list 2 = 2x flashes (on, off, on, off)
    2 = Cue list 3 = 3x flashes (on, off, on, off, on, off)
    ...and so on...
    8 = Cue list 9 = 9x flashes
    9 = Cue list 10 = 10x flashes

    The basic timing for 1x flash is:

        - Flash on over 0s
        - Hold on for 0.2s
        - Flash off over 0s
        - Hold off for 0.2s

'''
def channels(screen, control):
    screen = int(screen * 255)
    control = int(control * 255)
    return {'1': screen, '2': screen, '3': screen, '4': screen, '5': screen, '6': control, '7': control}


LIGHTS = {
    0: (channels(1, 0.0), 9),
    1: (channels(0, 0.1), 8),
    2: (channels(0, 0.2), 7),
    3: (channels(0, 0.3), 6),
    4: (channels(0, 0.4), 5),
    5: (channels(0, 0.5), 4),
    6: (channels(0, 0.6), 3),
    7: (channels(0, 0.7), 2),
    8: (channels(0, 0.8), 1),
    9: (channels(0, 0.9), 0.1),
}


CURRENT_STATE = [0] * 16


# avoid overload and turn light on with a fade
def fade_to(sender, start, end, duration, channels=16, universe=1):
    distance = end - start
    steps = int(duration * 10)
    if not steps:
        steps = 2
    step = duration/steps
    delta = distance/steps
    current = start
    value = current
    switch = 0
    while steps:
        switch += 1
        value += delta
        n = int(round(value))
        if n != current:
            current = n
            old = sender[1].dmx_data[:channels]
            target = [n] * channels
            if switch % 2:
                a = target
                b = old
            else:
                a = old
                b = target
            sender[universe].dmx_data = [a[x] if x % 2 else b[x] for x in range(channels)]
        time.sleep(step)
        steps -= 1


def flash(flashes):
    step = 0.2
    flash_duration = 0.02
    base = 0
    brightness = config.lights_brightness
    universe = 1
    channels = 16

    sender = sacn.sACNsender()
    sender.start()
    sender.activate_output(universe)
    sender[universe].multicast = True
    sender[universe].dmx_data = [0] * channels
    while flashes:
        fade_to(sender, base, brightness, flash_duration, channels, universe)
        time.sleep(step)
        sender[1].dmx_data = [0] * channels
        time.sleep(step)
        flashes -= 1
    sender[universe].dmx_data = [0] * channels
    time.sleep(step)
    sender.stop()


def switch(state, seq):
    import lanbox
    lb = lanbox.Lanbox()
    lb.layerGo(state)


if __name__ == '__main__':
    path = sys.argv[1]
    no_sleep = len(sys.argv) > 2 and sys.argv[2] == "no-sleep"

    n = int(os.path.getctime(path) - 1495280000) % 1000
    info = ox.avinfo(path)
    duration = info.get('duration', 0)

    seq = random(n * 100)
    pos = 0
    lights = []
    letter_offset = 0
    letter = path.split('/')[-1][0].lower()
    if config.letter_offset:
        letter_offset = 11 + string.ascii_lowercase.index(letter) * 10
    while pos < duration - 15:
        sleep = seq() + 15
        light = seq()
        if pos + sleep > duration:
            break
        if not no_sleep:
            time.sleep(sleep)
        print("letter", letter, "offset", letter_offset, "light", light, "cue", letter_offset + light)
        if config.lanbox:
            switch(light + letter_offset, seq)
        else:
            flash(light + 1)
        pos += sleep