#!/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 = Screen LED @ 100% fade time = 9s (cue list 1)
> 1 = LED Control @ 10% fade time = 8s  (cue list 2)
> 2 = LED Control @ 20% fade time = 7s  (cue list 3)
> 3 = LED Control @ 30% fade time = 6s  (cue list 4)
> 4 = LED Control @ 40% fade time = 5s  (cue list 5)
> 5 = LED Control @ 50% fade time = 4s  (cue List 6)
> 6 = LED Control @ 60% fade time = 3s  (cue list 7)
> 7 = LED Control @ 70% fade time = 2s  (cue list 8)
> 8 = LED Control @ 80% fade time = 1s  (cue list 9)
> 9 = LED Control @ 90% fade time = 0s  (cue list 10)
'''
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


def send(state):
    sender = sacn.sACNsender()
    sender.start()
    universe = 1
    sender.activate_output(universe)
    sender[1].multicast = True
    n = 16
    while n:
        sender[1].dmx_data = [value] * n
        time.sleep(1)
        n -= 1

    sender[1].dmx_data = [0]
    time.sleep(10)  # send the data for 10 seconds


def fade_to(target, duration):
    global CURRENT_STATE
    sender = sacn.sACNsender()
    sender.start()
    universe = 1
    sender.activate_output(universe)
    sender[1].multicast = True
    current = CURRENT_STATE[0]
    distance = target - current
    steps = int(duration * 10)
    step = duration/steps
    delta = distance/steps
    value = current
    switch = 0
    while steps:
        switch += 1
        value += delta
        n = int(round(value))
        if n != current:
            current = n
            old = sender[1].dmx_data[:16]
            target = [n] * 16
            if switch % 2:
                a = target
                b = old
            else:
                a = old
                b = target
            sender[1].dmx_data = [a[x] if x % 2 else b[x] for x in range(16)]
            CURRENT_STATE = sender[1].dmx_data[:16]
        time.sleep(step)
        steps -= 1
    CURRENT_STATE = sender[1].dmx_data = [0] * 16
    time.sleep(1)
    sender.stop()


def switch(state):
    if config.lanbox:
        import lanbox
        lb = lanbox.Lanbox()
        lb.layerGo(state)
    else:
        lights, duration = LIGHTS[state]
        brightness = lights['7']
        fade_to(brightness, duration)

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)
        switch(light + letter_offset)
        pos += sleep