from django.shortcuts import render, get_object_or_404, redirect
from django.http import HttpResponse
from django.contrib.auth.forms import AuthenticationForm, PasswordChangeForm, AdminPasswordChangeForm
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 django.contrib.auth.models import User
from django.contrib.auth.decorators import login_required, user_passes_test
from django.db.models.signals import post_save
from django.dispatch import receiver
from django.conf import settings
from django.contrib.auth.forms import PasswordResetForm
from django.urls import reverse

from .models import Device, Organization, Network, Model, Wifi, UserStatus
from .signals import *
from .forms import *
from .device import makewificonfig, heartbeathandler
from .tasks import mkfirmware

from distutils.dir_util import copy_tree
from celery.exceptions import TimeoutError

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

def is_superuser(user):
    return user.is_superuser

def is_staff(user):
    return user.is_staff

@login_required
def index(request):
    return redirect(reverse("devices"))

@csrf_exempt
def heartbeat(request):
    device = get_object_or_404(Device, secret=request.POST.get("secret", ""))
    ip = request.POST.get("ip", "")

    return HttpResponse(heartbeathandler(device, ip))

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


@csrf_exempt
def hosts(request):
    device = get_object_or_404(Device, secret=request.POST.get("secret", ""))
    sigRebootDevice(device.serial, None, False)
    device.reboot = False
    device.save()
    return render(request, "manager/hosts", {"device": device})

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

    device = get_object_or_404(Device, secret=request.POST.get("secret", ""))

    try:
        if not mkfirmware.apply_async((device, FWDIR), serializer='pickle').get(timeout=300):
            return HttpResponse(status=503)
    except TimeoutError:
        return HttpResponse(status=503)

    sigUpdateDevice(device.serial, None, False)
    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:
        try:
            device = Device.objects.get(id=device_id, organization__in=request.user.organization_set.all())
        except:
            device = None

        ajax = '{\n "status": '

        if not device:
            ajax += "-1"

        else:
            try:
                if device.curip:
                    socket.inet_aton(device.curip)
            except Exception as e:
                ajax += "-3"
            else:
                try:
                    ajax += str(1 if (device.curip and (timezone.now() - device.lasttime).total_seconds() < 300 and not os.WEXITSTATUS(os.system("ping -c1 -w1 " + device.curip + " > /dev/null 2>&1"))) else 2 if (True if not device.lasttime else (timezone.now() - device.lasttime).total_seconds() > 120) and (timezone.now() - device.lastbeat).total_seconds() < 60 else 0)
                except Exception as e:
                    ajax += str(e)
                    ajax += "-4"
                else:
                    ajax += ',\n "serial": "%s"' % device.serial
                    ajax += ',\n "name": "%s"' % device.name if device.name else ""
                    ajax += ',\n "ip": "%s"' % device.curip if device.curip else ""
                    ajax += ',\n "time": "%s"' % (None if not device.lasttime else str(int(time.mktime(timezone.make_naive(device.lasttime, timezone.get_current_timezone()).timetuple())) * 1000))
                    ajax += ',\n "lastbeat": "%s"' % (None if not device.lastbeat else str(int(time.mktime(timezone.make_naive(device.lastbeat, timezone.get_current_timezone()).timetuple())) * 1000))
                    ajax += ',\n "reboot": %i' % (1 if device.reboot else 0)
                    ajax += ',\n "update": %i' % (1 if device.update else 0)

                    ajax += ',\n "network": {'
                    ajax += '\n  "intip": "%s"' % device.network.intip
                    ajax += ',\n  "extip": "%s"' % device.network.extip
                    ajax += ',\n  "name": "%s"' % (device.network.name if device.network.name else "") 
                    ajax += '\n }'

    else:
        ajax += "-2"

    ajax += "\n}"
    return HttpResponse(ajax, content_type="application/json")

@login_required
def devices(request, code=200, exception=None):
    return render(request, "manager/index.html", {"title": "Device Administration", "exception": exception}, status=code)

@login_required
def editdevice(request, device_id):
   device = get_object_or_404(Device, id=device_id, organization__in=request.user.organization_set.all())
   subnets = Network.objects.filter(organization=device.organization)
   wifis = Wifi.objects.filter(organization=device.organization)

   form = DeviceForm(request.POST if request.method == "POST" else None, instance=device)

   form.fields["mac"].disabled = True
   form.fields["serial"].disabled = True
   form.fields["secret"].disabled = True
   form.fields["model"].disabled = True
   form.fields["password"].disabled = True

   if request.method == "POST" and form.is_valid():
        form.save()
        return redirect(reverse("devices"))

   return render(request, "manager/form.html", { "title": "Edit Device", "form": form })

@user_passes_test(is_superuser)
def makeuser(request):
    if request.POST.get("username", ""):
       user = User.objects.create_user(
               username=request.POST.get("username", ""), 
               password=str(uuid.uuid4().hex), 
               first_name=request.POST.get("firstname", ""), 
               last_name=request.POST.get("lastname", ""),
               is_staff=request.POST.get("staff", "0") == "True", 
               is_superuser=request.POST.get("superuser", "0") == "True", 
               email=request.POST.get("email", "")
               )
       
       user.organization_set.set(set(request.POST.getlist("orga", [])))

       form = PasswordResetForm({"email": user.email})

       if form.is_valid():
        form.save(
            request=request,
            use_https=True,
            email_template_name='registration/add_user.html')

       return redirect(reverse("users"))

    else:
       return render(request, "manager/adduser.html", {"title": "Add User"})

@login_required
def edituser(request, user_id):
   if request.user.is_staff or request.user.id == user_id:
       orgas = request.user.organization_set.all()
       user = request.user if request.user.id == user_id else User.objects.distinct().get(id=user_id, organization__in=orgas)

       if not user:
           return redirect(reverse("users"))

       if request.POST.get("form", ""):
           newfirst = request.POST.get("firstname", "")
           newlast = request.POST.get("lastname", "")
           if newlast != user.last_name or newfirst != user.first_name:
            sigRenameUser(user.username, request.user.username, "%s %s" % (user.first_name, user.last_name), "%s %s" % (newfirst, newlast))
            user.first_name = request.POST.get("firstname", "")
            user.last_name = request.POST.get("lastname", "")

           if request.user.is_staff or request.user.is_superuser:
               newstaff = request.POST.get("staff", "0") == "True"
               if newstaff != user.is_staff:
                sigStaffUser(user.username, request.user.username, newstaff)
                user.is_staff = newstaff

           if request.user.is_superuser:
               newsuper = request.POST.get("superuser", "0") == "True"
               if newsuper != user.is_superuser:
                sigSuperUser(user.username, request.user.username, newsuper)
                user.is_superuser = newsuper

               neworgas = set(request.POST.getlist("orga", []))
               oldorgas = set(user.organization_set.all())
               if neworgas != oldorgas:
                   sigOrgaUser(user.username, request.user.username, oldorgas, neworgas)
                   user.organization_set.set(neworgas)

           newmail = request.POST.get("email", "")
           if newmail != user.email:
            sigMailUser(user.username, request.user.username, user.email, newmail)
            user.email = newmail

           user.save()

           return redirect(reverse("users"))

       return render(request, "manager/edituser.html",
               {   
                   "title": "Edit User",
                   "auser": user
                   }
               )

   else:
       return redirect(reverse("two_factor:login", kwargs={'next': request.path}))

@login_required
def editwifi(request, wifi_id):
    wifi = get_object_or_404(Wifi, id=wifi_id, organization__in=request.user.organization_set.all())
    form = WifiForm(request.POST if request.method == "POST" else None, instance=wifi)
    form.fields["organization"].queryset = request.user.organization_set.all()
    if request.method == "POST" and form.is_valid():
        form.save()
        return redirect(reverse("wifi"))

    return render(request, "manager/form.html", { "title": "Edit WiFi", "form": form })

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

    device = get_object_or_404(Device, id=device_id)
    files = glob.glob("%s/%s.bin" % (FWDIR, device_id))

    if not ((files and datetime.datetime.fromtimestamp(os.path.getmtime(files[0]), timezone.get_current_timezone()) > device.model.firmware) or mkfirmware.apply_async((device, FWDIR), serializer='pickle').get(timeout=300)):
        return HttpResponse(status=503)

    sigUpdateDevice(device.serial, None, False)
    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

@login_required
def rebootdevice(request, device_id):
    device = get_object_or_404(Device, id=device_id, organization__in=request.user.organization_set.all())

    if not device.reboot:
       sigRebootDevice(device.serial, request.user.username, True)
       device.reboot = True
       device.save()

    return redirect(reverse("devices"))

@user_passes_test(is_staff)
def updatedevice(request, device_id):
    device = get_object_or_404(Device, id=device_id, organization__in=request.user.organization_set.all())

    if not device.update:
        sigUpdateDevice(device.serial, request.user.username, True)
        device.update = True
        device.save()

    return redirect(reverse("devices"))

@user_passes_test(is_superuser)
def deletedevice(request, device_id):
    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(reverse("devices"))

@user_passes_test(is_staff)
def deletewifi(request, wifi_id):
    wifi = get_object_or_404(Wifi, id=wifi_id, organization__in=request.user.organization_set.all())
    wifi.delete()
    return redirect(reverse("wifi"))

@user_passes_test(is_superuser)
def deleteuser(request, user_id):
    user = get_object_or_404(User, id=user_id)
    user.delete()
    return redirect(reverse("users"))

@user_passes_test(is_superuser)
def deletenetwork(request, network_id):
    network = get_object_or_404(Network, id=network_id)
    network.delete()
    return redirect(reverse("networks"))

@user_passes_test(is_superuser)
def deleteorga(request, orga_id):
    orga = get_object_or_404(Organization, id=orga_id)
    orga.delete()
    return redirect(reverse("organizations"))

@login_required
def makewifi(request):
    form = WifiForm(request.POST if request.method == "POST" else None, initial={"organization": request.user.userstatus.orga} if request.method == "GET" else None)
    form.fields["organization"].queryset = request.user.organization_set.all()
    if request.method == "POST" and form.is_valid():
        form.save()
        return redirect(reverse("wifi"))
            
    return render(request, "manager/form.html", { "title": "Add WiFi", "form": form })

@user_passes_test(is_superuser)
def makenetwork(request):
    if request.method == "POST":
        form = NetworkForm(request.POST)
        if form.is_valid():
            form.save()
            return redirect(reverse("networks"))

    else:
        form = NetworkForm()

    return render(request, "manager/form.html", { "title": "Add Network", "form": form })

@user_passes_test(is_superuser)
def editnetwork(request, network_id):
    net = get_object_or_404(Network, id=network_id)
    form = NetworkForm(request.POST if request.method == "POST" else None, instance=net)
    form.fields["intip"].disabled = True
    form.fields["extip"].disabled = True

    if request.method == "POST" and form.is_valid():
        form.save()
        return redirect(reverse("networks"))

    return render(request, "manager/form.html", { "title": "Edit Network", "form": form })

@login_required
def setactiveorga(request, orga_id):
    request.user.userstatus.orga = get_object_or_404(Organization, id=orga_id, users=request.user)
    request.user.userstatus.save()
    return HttpResponse("")

@user_passes_test(is_superuser)
def makeorganization(request):
    if request.method == "POST":
        form = OrgaForm(request.POST)
        if form.is_valid():
            orga = form.save()
            request.user.organization_set.add(orga)
            Network.objects.get(intip="No VPN").organization.add(orga)
            return redirect(reverse("organizations"))

    else:
        form = OrgaForm()

    return render(request, "manager/form.html", { "title": "Add Organization", "form": form })

@user_passes_test(is_superuser)
def editorganization(request, orga_id):
    orga = get_object_or_404(Organization, id=orga_id)
    if request.method == "POST":
        form = OrgaForm(request.POST, instance=orga)
        if form.is_valid():
            form.save()
            return redirect(reverse("organizations"))

    else:
        form = OrgaForm(instance=orga)

    return render(request, "manager/form.html", { "title": "Change Organization", "form": form })

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

   device_serial = request.POST.get("serial", "").replace(" ", "_")
   device_name = request.POST.get("name", "")
   device_organization = request.POST.get("organization", "")
   device_model = request.POST.get("model", "")
   device_ssid = request.POST.get("ssid", device_serial)
   device_key = request.POST.get("key", "")
   device_mac = request.POST.get("mac", "")

   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,
           ssid=device_ssid,
           key=device_key,
           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(),
           mac = device_mac or None,
           changed = timezone.now()
           )

   return redirect(reverse("devices"))

@receiver(post_save, sender=settings.AUTH_USER_MODEL)
def createUserStatus(sender, instance, created, **kwargs):
    if created:
        UserStatus.objects.create(user=instance)

@receiver(post_save, sender=settings.AUTH_USER_MODEL)
def saveUserStatus(sender, instance, **kwargs):
    try:
        instance.userstatus.save()
    except:
        UserStatus.objects.create(user=instance)

def errorhandler(request, code, exception):
    if code == 403:
        exception.human = "You have no permission to access the requested page."
    elif code == 400:
        exception.human = "Something seems to be wrong with the request you sent. Please try again."
    elif code == 404:
        exception.human = "Sorry, we were unable to find the page you requested. Please check the address and try again."
    elif code == 500:
        exception.human = "Sorry, something seems to be wrong on our end. Please try again later or contact support if the problem persists."

    return devices(request, code=code, exception=exception)

def handler400(request, exception):
    return errorhandler(request, 400, exception)

def handler403(request, exception):
    return errorhandler(request, 403, exception)

def handler404(request, exception):
    return errorhandler(request, 404, exception)

def handler500(request):
    return errorhandler(request, 500, Exception("Please check the server logs for additional information."))