from django.views.generic import FormView, CreateView, TemplateView, DetailView
from django.http import HttpResponseRedirect
from .forms import BetaAccessForm
from .models import BetaAccess, BetaAccessVMType, BetaAccessVM
from django.contrib import messages
from django.core.urlresolvers import reverse
from django.core.mail import EmailMessage
from utils.mailer import BaseEmail
from django.shortcuts import render
from django.shortcuts import redirect
from django import forms
from django.core.exceptions import ValidationError
from django.views.decorators.cache import cache_control
from django.conf import settings
from utils.forms import BillingAddressForm, UserBillingAddressForm
from membership.models import StripeCustomer
from hosting.models import HostingOrder, HostingBill
from utils.stripe_utils import StripeUtils
from datetime import datetime
from membership.models import CustomUser, StripeCustomer

from opennebula_api.models import OpenNebulaManager
from opennebula_api.serializers import VirtualMachineTemplateSerializer, VirtualMachineSerializer


class LandingProgramView(TemplateView):
    template_name = "datacenterlight/landing.html"


class SuccessView(TemplateView):
    template_name = "datacenterlight/success.html"

    def get(self, request, *args, **kwargs):
        if 'specs' not in request.session or 'user' not in request.session:
            return HttpResponseRedirect(reverse('datacenterlight:index'))
        else :
            del request.session['specs']
            del request.session['user']
        return render(request, self.template_name)

class PricingView(TemplateView):
    template_name = "datacenterlight/pricing.html"

    def get(self, request, *args, **kwargs):
        try:
            manager = OpenNebulaManager()
            templates = manager.get_templates()

            context = {
                'templates': VirtualMachineTemplateSerializer(templates, many=True).data,
            }
        except:
            messages.error(request,
                           'We have a temporary problem to connect to our backend. \
                           Please try again in a few minutes'
                           )
            context = {
                'error': 'connection'
                    }

        return render(request, self.template_name, context)

    def post(self, request):

        cores = request.POST.get('cpu')
        memory = request.POST.get('ram')
        storage = request.POST.get('storage')
        price = request.POST.get('total')

        template_id = int(request.POST.get('config'))

        manager = OpenNebulaManager()
        template = manager.get_template(template_id)

        request.session['template'] = VirtualMachineTemplateSerializer(template).data

        if not request.user.is_authenticated():
            request.session['next'] = reverse('hosting:payment')

        request.session['specs'] = {
            'cpu': cores,
            'memory': memory,
            'disk_size': storage,
            'price': price,
        }

        return redirect(reverse('hosting:payment'))


class BetaAccessView(FormView):
    template_name = "datacenterlight/beta_access.html"
    form_class = BetaAccessForm
    success_message = "Thank you, we will contact you as soon as possible"

    def form_valid(self, form):

        context = {
            'base_url': "{0}://{1}".format(self.request.scheme, self.request.get_host())
        }

        email_data = {
            'subject': 'DatacenterLight Beta Access Request',
            'from_address': '(datacenterlight) datacenterlight Support <support@datacenterlight.ch>',
            'to': form.cleaned_data.get('email'),
            'from': '(datacenterlight) DatacenterLight Support support@datacenterlight.ch',
            'context': context,
            'template_name': 'request_access_confirmation',
            'template_path': 'datacenterlight/emails/'
        }
        email = BaseEmail(**email_data)
        email.send()

        context.update({
            'email': form.cleaned_data.get('email')
        })

        email_data = {
            'subject': 'DatacenterLight Beta Access Request',
            'from_address': '(datacenterlight) datacenterlight Support <support@datacenterlight.ch>',
            'to': 'info@ungleich.ch',
            'context': context,
            'template_name': 'request_access_notification',
            'template_path': 'datacenterlight/emails/'
        }
        email = BaseEmail(**email_data)
        email.send()

        messages.add_message(self.request, messages.SUCCESS, self.success_message)
        return render(self.request, 'datacenterlight/beta_success.html', {})


class BetaProgramView(CreateView):
    template_name = "datacenterlight/beta.html"
    model = BetaAccessVM
    fields = '__all__'
    # form_class = BetaAccessForm
    # success_url = "/datacenterlight#requestform"
    success_message = "Thank you, we will contact you as soon as possible"

    def get_success_url(self):
        success_url = reverse('datacenterlight:beta')
        success_url += "#success"
        return success_url

    def get_context_data(self, **kwargs):
        vms = BetaAccessVMType.objects.all()
        context = super(BetaProgramView, self).get_context_data(**kwargs)

        # templates = OpenNebulaManager().get_templates()
        # data = VirtualMachineTemplateSerializer(templates, many=True).data

        context.update({
            'base_url': "{0}://{1}".format(self.request.scheme, self.request.get_host()),
            'vms': vms
        })
        return context

    def post(self, request, *args, **kwargs):
        data = request.POST
        vms = BetaAccessVM.create(data)

        context = {
            'base_url': "{0}://{1}".format(self.request.scheme, self.request.get_host()),
            'email': data.get('email'),
            'name': data.get('name'),
            'vms': vms
        }

        email_data = {
            'subject': 'DatacenterLight Beta Access Request',
            'from_address': '(datacenterlight) datacenterlight Support <support@datacenterlight.ch>',
            'to': 'info@ungleich.ch',
            'context': context,
            'template_name': 'request_beta_access_notification',
            'template_path': 'datacenterlight/emails/'
        }
        email = BaseEmail(**email_data)
        email.send()

        messages.add_message(self.request, messages.SUCCESS, self.success_message)
        return HttpResponseRedirect(self.get_success_url())


class IndexView(CreateView):
    template_name = "datacenterlight/index.html"
    model = BetaAccess
    form_class = BetaAccessForm
    success_url = "/datacenterlight#requestform"
    success_message = "Thank you, we will contact you as soon as possible"

    @cache_control(no_cache=True, must_revalidate=True, no_store=True)
    def get(self, request, *args, **kwargs):
        if 'specs' in request.session :
            del request.session['specs']
        if 'user' in request.session :
            del request.session['user']
        try:
            manager = OpenNebulaManager()
            templates = manager.get_templates()
            context = {
                'templates': VirtualMachineTemplateSerializer(templates, many=True).data,
            }
        except:
            messages.error(request,
                           'We have a temporary problem to connect to our backend. \
                           Please try again in a few minutes'
                           )
            context = {
                'error': 'connection'
                    }
        return render(request, self.template_name, context)

    def post(self, request):
        cores = request.POST.get('cpu')
        memory = request.POST.get('ram')
        storage = request.POST.get('storage')
        price = request.POST.get('total')
        template_id = int(request.POST.get('config'))
        manager = OpenNebulaManager()
        template = manager.get_template(template_id)
        template_data = VirtualMachineTemplateSerializer(template).data

        name = request.POST.get('name')
        email = request.POST.get('email')
        name_field = forms.CharField()
        email_field = forms.EmailField()
        try:
            name = name_field.clean(name)
        except ValidationError as err:
            messages.add_message(self.request, messages.ERROR, '%(value) is not a proper name.'.format(name))
            return HttpResponseRedirect(reverse('datacenterlight:index'))

        try:
            email = email_field.clean(email)
        except ValidationError as err:
            messages.add_message(self.request, messages.ERROR, '%(value) is not a proper email.'.format(email))
            return HttpResponseRedirect(reverse('datacenterlight:index'))

        specs = {
            'cpu': cores,
            'memory': memory,
            'disk_size': storage,
            'price': price
        }
        
        this_user = {
            'name': name,
            'email': email
        }

        request.session['specs'] = specs
        request.session['template'] = template_data
        request.session['user'] = this_user
        return HttpResponseRedirect(reverse('datacenterlight:payment'))

    def get_success_url(self):
        success_url = reverse('datacenterlight:index')
        success_url += "#requestform"
        return success_url

    def get_context_data(self, **kwargs):
        context = super(IndexView, self).get_context_data(**kwargs)
        context.update({
            'base_url': "{0}://{1}".format(self.request.scheme, self.request.get_host())
        })
        return context

    def form_valid(self, form):

        context = {
            'base_url': "{0}://{1}".format(self.request.scheme, self.request.get_host())
        }

        email_data = {
            'subject': 'DatacenterLight Beta Access Request',
            'from_address': '(datacenterlight) datacenterlight Support <support@datacenterlight.ch>',
            'to': form.cleaned_data.get('email'),
            'from': '(datacenterlight) DatacenterLight Support support@datacenterlight.ch',
            'context': context,
            'template_name': 'request_access_confirmation',
            'template_path': 'datacenterlight/emails/'
        }
        email = BaseEmail(**email_data)
        email.send()

        context.update({
            'email': form.cleaned_data.get('email')
        })

        email_data = {
            'subject': 'DatacenterLight Beta Access Request',
            'from_address': '(datacenterlight) datacenterlight Support <support@datacenterlight.ch>',
            'to': 'info@ungleich.ch',
            'context': context,
            'template_name': 'request_access_notification',
            'template_path': 'datacenterlight/emails/'
        }
        email = BaseEmail(**email_data)
        email.send()

        messages.add_message(self.request, messages.SUCCESS, self.success_message)
        return super(IndexView, self).form_valid(form)


class PaymentOrderView(FormView):
    template_name = 'hosting/payment.html'
    form_class = BillingAddressForm

    def get_context_data(self, **kwargs):
        context = super(PaymentOrderView, self).get_context_data(**kwargs)
        context.update({
            'stripe_key': settings.STRIPE_API_PUBLIC_KEY
        })
        return context

    @cache_control(no_cache=True, must_revalidate=True, no_store=True)
    def get(self, request, *args, **kwargs):
        if 'specs' not in request.session or 'user' not in request.session:
            return HttpResponseRedirect(reverse('datacenterlight:index'))
        return self.render_to_response(self.get_context_data())

    def post(self, request, *args, **kwargs):
        form = self.get_form()
        if form.is_valid():
            # Get billing address data
            billing_address_data = form.cleaned_data
            context = self.get_context_data()
            template = request.session.get('template')
            specs = request.session.get('specs')
            user = request.session.get('user')
            vm_template_id = template.get('id', 1)
            final_price = specs.get('price')
            token = form.cleaned_data.get('token')
            try:
                custom_user = CustomUser.objects.get(email=user.get('email'))
            except CustomUser.DoesNotExist:
                password = CustomUser.get_random_password()
                # Register the user, and do not send emails
                CustomUser.register(user.get('name'), 
                                    password, 
                                    user.get('email'), 
                                    app='dcl', 
                                    base_url=None, send_email=False)


            # Get or create stripe customer
            customer = StripeCustomer.get_or_create(email=user.get('email'),
                                                    token=token)
            if not customer:
                form.add_error("__all__", "Invalid credit card")
                return self.render_to_response(self.get_context_data(form=form))

            # Create Billing Address
            billing_address = form.save()

            # Make stripe charge to a customer
            stripe_utils = StripeUtils()
            charge_response = stripe_utils.make_charge(amount=final_price,
                                                       customer=customer.stripe_id)
            charge = charge_response.get('response_object')

            # Check if the payment was approved
            if not charge:
                context.update({
                    'paymentError': charge_response.get('error'),
                    'form': form
                })
                return render(request, self.template_name, context)

            charge = charge_response.get('response_object')
        
            # Create OpenNebulaManager
            manager = OpenNebulaManager(email=settings.OPENNEBULA_USERNAME,
                                        password=settings.OPENNEBULA_PASSWORD)
            
            # Create a vm using logged user
            vm_id = manager.create_vm(
                template_id=vm_template_id,
                specs=specs,
                vm_name="{email}-{template_name}-{date}".format(
                       email=user.get('email'), 
                       template_name=template.get('name'),
                       date=int(datetime.now().strftime("%s")))
            )
            
            # Create a Hosting Order
            order = HostingOrder.create(
                price=final_price,
                vm_id=vm_id,
                customer=customer,
                billing_address=billing_address
            )
            
            # Create a Hosting Bill
            bill = HostingBill.create(
                customer=customer, billing_address=billing_address)

            # Create Billing Address for User if he does not have one
            if not customer.user.billing_addresses.count():
                billing_address_data.update({
                    'user': customer.user.id
                })
                billing_address_user_form = UserBillingAddressForm(
                    billing_address_data)
                billing_address_user_form.is_valid()
                billing_address_user_form.save()

            # Associate an order with a stripe payment
            order.set_stripe_charge(charge)

            # If the Stripe payment was successed, set order status approved
            order.set_approved()
            
            vm = VirtualMachineSerializer(manager.get_vm(vm_id)).data
            
            context = {
                'name': user.get('name'),
                'email': user.get('email'),
                'cores': specs.get('cpu'),
                'memory': specs.get('memory'),
                'storage': specs.get('disk_size'),
                'price': specs.get('price'),
                'template': template.get('name'),
                'vm.name': vm['name'],
                'vm.id': vm['vm_id'],
                'order.id': order.id
            }
            email_data = {
                'subject': "Data Center Light Order from %s" % context['email'],
                'from_email': '(Data Center Light) Data Center Light Support <support@datacenterlight.ch>',
                'to': ['info@ungleich.ch'],
                'body': "\n".join(["%s=%s" % (k, v) for (k, v) in context.items()]),
                'reply_to': [context['email']],
            }
            email = EmailMessage(**email_data)
            email.send()
            return HttpResponseRedirect(reverse('datacenterlight:order_confirmation', kwargs={'pk': order.id}))
        else:
            return self.form_invalid(form)

class OrderConfirmationView(DetailView):
    template_name = "datacenterlight/order_detail.html"
    context_object_name = "order"
    model = HostingOrder
    def get_context_data(self, **kwargs):
        # Get context
        context = super(DetailView, self).get_context_data(**kwargs)
        obj = self.get_object()
        manager = OpenNebulaManager(email=settings.OPENNEBULA_USERNAME,
                                    password=settings.OPENNEBULA_PASSWORD)
        try:
            vm = manager.get_vm(obj.vm_id)
            context['vm'] = VirtualMachineSerializer(vm).data
            context['next_url'] = reverse('datacenterlight:order_success')
        except WrongIdError:
            messages.error(self.request,
                           'The VM you are looking for is unavailable at the moment. \
                            Please contact Data Center Light support.'
                           )
            self.kwargs['error'] = 'WrongIdError'
            context['error'] = 'WrongIdError'
        except ConnectionRefusedError:
            messages.error(self.request,
                           'In order to create a VM, you need to create/upload your SSH KEY first.'
                           )
        return context