# -*- coding: utf-8 -*-
from __future__ import unicode_literals

import os
import urllib2

from django.http import StreamingHttpResponse, HttpResponseServerError
from django.shortcuts import render_to_response, get_object_or_404
from django.views.generic.detail import DetailView
from django.views.generic.edit import UpdateView
from django.conf import settings
from django.contrib.messages.views import SuccessMessageMixin
from django.contrib.auth.decorators import login_required
from django.utils.decorators import method_decorator

from coin.members.models import Member

from .models import VPNConfiguration


class VPNView(SuccessMessageMixin, UpdateView):
    model = VPNConfiguration
    fields = ["ipv4_endpoint", "ipv6_endpoint", "comment"]
    success_message = "Configuration enregistrée avec succès !"

    @method_decorator(login_required)
    def dispatch(self, *args, **kwargs):
        return super(VPNView, self).dispatch(*args, **kwargs)

    def get_object(self):
        if self.request.user.is_superuser:
            return get_object_or_404(VPNConfiguration, pk=self.kwargs.get("pk"))
        # For normal users, ensure the VPN belongs to them.
        return get_object_or_404(
            VPNConfiguration,
            pk=self.kwargs.get("pk"),
            offersubscription__member=self.request.user,
        )


class VPNGeneratePasswordView(VPNView):
    """This generates a random password, saves it in hashed form, and returns
    it to the user in cleartext.
    """

    def get_context_data(self, **kwargs):
        context = super(VPNGeneratePasswordView, self).get_context_data(**kwargs)
        # Generate a new random password and save it
        password = Member.objects.make_random_password()
        self.object.password = password
        # This will hash the password automatically
        self.object.full_clean()
        self.object.save()
        context["password"] = password
        return context


@login_required
def get_graph(request, vpn_id, period="daily"):
    """ This get the graph for the associated vpn_id and time period
    """
    if request.user.is_superuser:
        vpn = get_object_or_404(VPNConfiguration, pk=vpn_id)
    else:
        # For normal users, ensure the VPN belongs to them
        vpn = get_object_or_404(
            VPNConfiguration, pk=vpn_id, offersubscription__member=request.user
        )

    time_periods = {
        "hourly": "-1hour",
        "daily": "-24hours",
        "weekly": "-8days",
        "monthly": "-32days",
        "yearly": "-13months",
    }
    if period not in time_periods:
        period = "daily"

    graph_url = os.path.join(
        settings.GRAPHITE_SERVER,
        "render/?width=586&height=308&from=%(period)s&"
        "target=alias%%28scaleToSeconds%%28vpn1.%(login)s.downrxbytes%%2C1%%29%%2C%%20%%22Download%%22%%29&"
        "target=alias%%28scaleToSeconds%%28vpn1.%(login)s.uptxbytes%%2C1%%29%%2C%%20%%22Upload%%22%%29&"
        "title=VPN%%20Usage%%20%(login)s"
        % {"period": time_periods[period], "login": vpn.login},
    )
    try:
        return StreamingHttpResponse(
            urllib2.urlopen(graph_url), content_type="image/png"
        )
    except urllib2.URLError:
        return HttpResponseServerError()