from celery import shared_task
from distutils.dir_util import copy_tree

from .views import makewificonfig
from .hostname import hostname

import os
import time
import glob
import tempfile
import crypt
import subprocess
import datetime

@shared_task
def mkfirmware(device, path):
    if device.firmware and device.firmware > device.model.firmware and device.firmware > device.changed and glob.glob("%s/%s.bin" % (path, device.id)):
        return True

    BEFORE = os.getcwd()
    DEVICEDIR = "/opt/vpnmanager/device-config/%i/" % device.model.id
    SRCDIR = "/opt/vpnmanager/imagebuilder/%i/" % device.model.id

    tempdir = tempfile.TemporaryDirectory()

    copy_tree(DEVICEDIR, tempdir.name)

    # Write OpenVPN config

    with open(tempdir.name + "/etc/openvpn/client.conf", "w") as vpnconf:
        vpnconf.write(device.vpnconfig)

    # Write secret

    with open(tempdir.name + "/etc/vpnsecret", "w") as secret:
        secret.write('SECRET="%s"\nHOSTNAME="%s"' % (device.secret, hostname))

    # Write password

    with open(tempdir.name + "/etc/shadow", "r") as shadow:
        password = crypt.crypt(device.password, crypt.mksalt(crypt.METHOD_MD5))
        shadowin = shadow.read()

    with open(tempdir.name + "/etc/shadow", "w") as shadowout:
        shadowout.write(shadowin.replace("$PASSWORD", password))

    # Write Wireless config

    with open(tempdir.name + "/etc/config/wireless", "r") as wireless:
        wirein = wireless.read()

    with open(tempdir.name + "/etc/config/wireless", "w") as wireout:
        wire = wirein.replace("$SSID", device.serial)
        wireout.write(wire + "\n" + makewificonfig(device))

    # Create compilation environment

    os.system("rm -rf " + SRCDIR + "/files/")
    os.mkdir(SRCDIR + "/files/")
    os.system("cp -r " + tempdir.name + "/* " + SRCDIR + "/files/")

    tempdir.cleanup()

    os.system("rm " + SRCDIR + "/bin/targets/ar71xx/generic/*")

    # Build image

    os.chdir(SRCDIR)

    try:
        subprocess.call(["/usr/bin/make"])
    except:
        os.chdir(BEFORE)
        return False

    os.chdir(BEFORE)

    os.rename(glob.glob(SRCDIR + "/bin/targets/ar71xx/generic/*squashfs-sysupgrade.bin")[0], "%s/%s.bin" % (path, device.id))
    os.system("rm -rf " + SRCDIR + "/files/")
    os.system("rm " + SRCDIR + "/bin/targets/ar71xx/generic/*")
    device.firmware = datetime.datetime.now()
    device.save()
    return True