from django.shortcuts import render, get_object_or_404, redirect
from django.http import HttpResponse
from django.contrib.auth.forms import AuthenticationForm
from django.db.models import Q
from django.views.decorators.csrf import csrf_exempt
from django.utils import timezone
from django.core.files import File
from django.db.models.fields.files import FieldFile

from .models import Device, Organization, Network, Model, Wifi

from distutils.dir_util import copy_tree

import glob
import sys
import subprocess
import os
import socket
import tempfile
import crypt
import tarfile
import datetime

def index(request):
    if request.user.is_authenticated:
        return redirect("/devices")
    else:
        return redirect("/accounts/login")

@csrf_exempt
def heartbeat(request):
    device = get_object_or_404(Device, secret=request.POST.get("secret", ""))
    ip = request.POST.get("ip", "")
    
    if device.update:
        device.reboot = False
        code = """
. /etc/vpnsecret
if /usr/bin/wget -O/tmp/update.bin https://admin360.kumi.host/update --post-data "secret=$SECRET" --no-check-certificate 2>/var/log/wget;
 then
  /sbin/sysupgrade -F -n /tmp/update.bin
fi
"""

    elif device.lastbeat < device.changed:
        code = """
. /etc/vpnsecret
if /usr/bin/wget -O/tmp/wireless.in https://admin360.kumi.host/wireless --post-data "secret=$SECRET" --no-check-certificate 2>/var/log/wget;
 then
  while read p
   do
    echo $p >/tmp/wireless.line
    if /bin/grep wifi-iface /tmp/wireless.line && ! /bin/grep radio /tmp/wireless.line;
     then
      break
    fi
    echo $p >>/tmp/wireless.og
  done </etc/config/wireless
  /bin/cat /tmp/wireless.in >>/tmp/wireless.og
  /bin/cp /tmp/wireless.og /etc/config/wireless
  /sbin/uci commit /etc/config/wireless
  /bin/rm /tmp/wireless.*
fi
"""
        device.lastbeat = timezone.now()

    elif device.reboot:
        code = "/sbin/reboot"

    else:
        code = ""
        device.lastbeat = timezone.now()
        if ip:
            device.lasttime = timezone.now()
            device.curip = ip

    device.save()

    return HttpResponse(code)

def makewificonfig(device):
    output = ""
    i = 1
    for wifi in device.wifi.all():
        output += """config wifi-iface
        option network 'wwan%i'
        option ssid '%s'
        option encryption 'psk2'
        option device 'radio1'
        option mode 'sta'
        option key '%s'
""" % (i, wifi.ssid, wifi.key)
        i += 1

    return output

@csrf_exempt
def wireless(request):
    device = get_object_or_404(Device, secret=request.POST.get("secret", ""))
    return HttpResponse(makewificonfig(device))


@csrf_exempt
def hosts(request):
    device = get_object_or_404(Device, secret=request.POST.get("secret", ""))
    device.reboot = False
    device.save()
    return render(request, "manager/hosts", {"device": device})

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

    if glob.glob(SRCDIR + "/.kumilock"):
        return False

    with open(SRCDIR + "/.kumilock", "w") as lock:
        lock.write("")

    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"' % device.secret)
    
    # 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))
    
    '''
    # Generate .tar.gz file

    with tarfile.open(tempdir.name + ".tar.gz", "w:gz") as tar:
        tar.add(tempdir.name, arcname=os.path.sep)

    with open(tempdir.name + ".tar.gz", "rb") as download:
        response = HttpResponse(download.read(), content_type="application/tar+gzip")
        response['Content-Disposition'] = 'inline; filename=' + os.path.basename(device.serial + ".tar.gz")
        return response
    '''

    # 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.remove(SRCDIR + "/.kumilock")
        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.remove(SRCDIR + "/.kumilock")
    os.system("rm -rf " + SRCDIR + "/files/")
    os.system("rm " + SRCDIR + "/bin/targets/ar71xx/generic/*")
    device.firmware = datetime.datetime.now()
    device.save()
    return True

@csrf_exempt
def update(request):
    FWDIR = "/opt/vpnmanager/images/"

    device = get_object_or_404(Device, secret=request.POST.get("secret", ""))
    
    if not mkfirmware(device, FWDIR):
        return HttpResponse(status=503)

    device.update = False
    device.save()

    with open("%s/%s.bin" % (FWDIR, device.id), "rb") as download:
        response = HttpResponse(download.read(), content_type="application/octet-stream")
        response['Content-Disposition'] = 'inline; filename=%s.bin' % device.serial
        return response

def ping(request, device_id):
    if request.user.is_authenticated:
        device = None
        ajax = '{\n "status": '

        for organization in Organization.objects.filter(users=request.user):
            device = device or Device.objects.filter(id=device_id, organization=organization)

        if not device:
            ajax += "-1"

        else:
            try:
                socket.inet_aton(device[0].curip)
                ajax += str(int(not os.WEXITSTATUS(os.system("ping -c1 -w1 " + device[0].curip + " > /dev/null 2>&1"))))
                ajax += ',\n "serial": "%s"' % device[0].serial
                ajax += ',\n "name": "%s"' % device[0].name if device[0].name else ""
                ajax += ',\n "ip": "%s"' % device[0].curip
                ajax += ',\n "time": "%s"' % device[0].lasttime
                ajax += ',\n "lastbeat": "%s"' % device[0].lastbeat
                ajax += ',\n "reboot": %i' % (1 if device[0].reboot else 0)
                ajax += ',\n "update": %i' % (1 if device[0].update else 0)

                ajax += ',\n "network": {'
                ajax += '\n  "intip": "%s"' % device[0].network.intip
                ajax += ',\n  "extip": "%s"' % device[0].network.extip
                ajax += ',\n  "name": "%s"' % device[0].network.name
                ajax += '\n }'

            except:
                ajax += "-3"

    else:
        ajax += "-2"

    ajax += "\n}"
    return HttpResponse(ajax, content_type="application/json")
    
def devices(request):
    if request.user.is_authenticated:
        user = request.user
        devices = set()
        wifis = set()
        orga = ", ".join([x.__str__() for x in Organization.objects.filter(users=user)])

        for organization in Organization.objects.filter(users=user):
            for device in Device.objects.filter(organization=organization):
                devices.add(device)
            for wifi in Wifi.objects.filter(organization=organization):
                wifis.add(wifi)

        return render(request, "manager/index.html",
                {
                    "title": "Device Administration",
                    "user": user,
                    "organization": orga,
                    "devices": sorted(devices, key=lambda x: x.__str__()),
                    "wifis":  wifis
                    }
                )
    else:
        return redirect("/")

def editdevice(request, device_id):
    if request.user.is_authenticated:
       device = None
       subnets = set()
       wifis = set()
       
       for organization in Organization.objects.filter(users=request.user):
          device = device or Device.objects.filter(id=device_id, organization=organization)
       if not device:
           return redirect("/")

       for subnet in Network.objects.filter(organizations=device[0].organization):
           subnets.add(subnet)

       for wifi in Wifi.objects.filter(organization=device[0].organization):
           wifis.add(wifi)


       if request.POST.get("subnet", ""):
           subnet = Network.objects.filter(intip=request.POST.get("subnet", device[0].network.intip if device[0].network else "No VPN"))

           if subnet[0] in subnets:
            device[0].name = request.POST.get("name", "")
            device[0].network = subnet[0]
            device[0].reboot = True if request.POST.get("reboot", "0") == "True" else False
            device[0].update = True if request.POST.get("update", "0") == "True" else False
            device[0].wifi.set(request.POST.getlist("wifi", []))
            device[0].changed = timezone.now()
            device[0].save()

            return redirect("/")

       return render(request, "manager/edit.html",
                {
                    "title": "Edit Device",
                    "device": device[0],
                    "subnets": subnets,
                    "user": request.user,
                    "wifis": wifis,
                    "curfis": Wifi.objects.filter(device=device[0])
                    }
                )

    else:
        return redirect("/")

def editwifi(request, wifi_id):
    if not request.user.is_authenticated:
        return redirect("/")

    wifi = None

    for organization in Organization.objects.filter(users=request.user):
        wifi = wifi or Wifi.objects.filter(id=wifi_id, organization=organization)

    if not wifi:
        return redirect("/")

    if request.POST.get("serial", ""):
        wifi[0].serial = request.POST.get("serial", "")
        wifi[0].ssid = request.POST.get("ssid", "")
        wifi[0].key = request.POST.get("key", "")
        wifi[0].save()

        return redirect("/")

    return render(request, "manager/editwifi.html",
            {
                "title": "Edit WiFi",
                "wifi": wifi[0]
                }
            )

def getconfig(request, device_id):
    FWDIR = "/opt/vpnmanager/images/"

    if not request.user.is_superuser:
        return redirect("/")

    device = get_object_or_404(Device, id=device_id)

    if not mkfirmware(device, FWDIR):
        return HttpResponse("Something went wrong generating the firmware image. The server may be busy, please try again later.")
        
    device.update = False
    device.save()

    with open("%s/%s.bin" % (FWDIR, device.id), "rb") as download:
        response = HttpResponse(download.read(), content_type="application/octet-stream")
        response['Content-Disposition'] = 'inline; filename=%s.bin' % device.serial
        return response

def rebootdevice(request, device_id):
    if request.user.is_authenticated:
       device = None
       for organization in Organization.objects.filter(users=request.user):
          device = device or Device.objects.filter(id=device_id, organization=organization)

       if device:
          device[0].reboot = True
          device[0].save()

    return redirect("/")

def updatedevice(request, device_id):
    if request.user.is_staff:
        device = None
        for organization in Organization.objects.filter(users=request.user):
            device = device or Device.objects.filter(id=device_id, organization=organization)

        if device:
            device[0].update = True
            device[0].save()

    return redirect("/")

def deletedevice(request, device_id):
    if request.user.is_superuser:
        CADIR = "/etc/openvpn/ca/"
        BEFORE = os.getcwd()

        device = get_object_or_404(Device, id=device_id)

        os.chdir(CADIR)

        subprocess.call(CADIR + "/revoke " + device.serial, shell=True)
        os.system("rm " + CADIR + "/keys/" + device.serial + ".{crt,csr,key}")

        os.chdir(BEFORE)

        device.delete()

    return redirect("/")

def makewifi(request):
    wifi_serial = request.POST.get("serial", "")
    wifi_ssid = request.POST.get("ssid", "")
    wifi_key = request.POST.get("key", "")
    wifi_organization = request.POST.get("organization", "")

    if not request.user.is_staff:
        return redirect("/")

    if not wifi_serial:
        orga = Organization.objects.filter(users=request.user)

        return render(request, "manager/addwifi.html",
                {
                    "title": "Add WiFi",
                    "organizations": orga
                    }
                )

    wifi = Wifi.objects.create(
            serial = wifi_serial,
            ssid = wifi_ssid,
            key = wifi_key,
            organization = Organization.objects.filter(id=wifi_organization)[0]
            )

    return redirect("/")

def makedevice(request):
   CADIR = "/etc/openvpn/ca/"
   CONFIGDIR = "/etc/openvpn/client-configs/"
   BEFORE = os.getcwd()

   device_serial = request.POST.get("serial", "")
   device_name = request.POST.get("name", "")
   device_organization = request.POST.get("organization", "")
   device_model = request.POST.get("model", "")

   if not request.user.is_superuser:
        return redirect("/")

   if not device_serial:
        orga = Organization.objects.all()
        models = Model.objects.all()
   
        return render(request, "manager/add.html",
                {
                    "title": "Add Device",
                    "organizations": orga,
                    "models": models
                    }
                )

   if glob.glob(CADIR + "/keys/" + device_serial + "*"):
        return HttpResponse("This key already exists.")

   os.chdir(CADIR)

   if subprocess.call(CADIR + "/generate-key " + device_serial, shell=True):
        os.chdir(BEFORE)
        return HttpResponse("Something went wrong trying to generate the key.")

   if glob.glob(CONFIGDIR + "/files/" + device_serial + "*"):
       os.chdir(BEFORE)
       return HttpResponse("This configuration file already exists.")

   os.chdir(CONFIGDIR)

   if subprocess.call(CONFIGDIR + "/make_config " + device_serial, shell=True):
       os.chdir(BEFORE)
       return HttpResponse("Something went wrong trying to generate the config file.")

   os.chdir(BEFORE)

   device = Device.objects.create(
           serial=device_serial,
           name=device_name,
           model=Model.objects.filter(id=device_model)[0],
           network=Network.objects.filter(intip="No VPN")[0],
           organization=Organization.objects.filter(id=device_organization)[0],
           vpnconfig = open(CONFIGDIR + "/files/" + device_serial + ".ovpn").read()
           )

   return redirect("/")