import uuid

from django.conf import settings
from django.contrib.auth.tokens import default_token_generator
from django.core.files.base import ContentFile
from django.http import HttpResponseRedirect
from django.urls import reverse_lazy, reverse
from django.utils.decorators import method_decorator
from django.utils.http import urlsafe_base64_decode
from django.utils.safestring import mark_safe
from django.views import View
from django.views.generic import CreateView, TemplateView, FormView
from django.utils.translation import gettext_lazy as _
from django.views.decorators.cache import never_cache, cache_control
from django.contrib import messages
from django.shortcuts import render

from dynamicweb2.ldap_manager import LdapManager
from hosting.forms import HostingUserLoginForm, HostingUserSignupForm, ResendActivationEmailForm, \
    PasswordResetRequestForm, UserHostingKeyForm
from hosting.mailer import BaseEmail
from hosting.mixins import LoginViewMixin, ResendActivationLinkViewMixin, PasswordResetViewMixin, \
    PasswordResetConfirmViewMixin
from hosting.models import CustomUser, UserHostingKey

decorators = [never_cache]


class LoginView(LoginViewMixin):
    template_name = "hosting/login.html"
    form_class = HostingUserLoginForm
    success_url = reverse_lazy('hosting:dashboard')


class SignupView(CreateView):
    template_name = 'hosting/signup.html'
    form_class = HostingUserSignupForm
    model = CustomUser
    success_url = reverse_lazy('hosting:dashboard')

    def get_success_url(self):
        next_url = self.request.session.get(
            'next', self.success_url)
        return next_url

    def form_valid(self, form):
        name = form.cleaned_data.get('name')
        email = form.cleaned_data.get('email')
        password = form.cleaned_data.get('password')
        this_base_url = "{0}://{1}".format(self.request.scheme,
                                           self.request.get_host())
        CustomUser.register(name, password, email,
                            app='dcl', base_url=this_base_url)

        return HttpResponseRedirect(reverse_lazy('hosting:signup-validate'))

    @method_decorator(decorators)
    def get(self, request, *args, **kwargs):
        if self.request.user.is_authenticated:
            return HttpResponseRedirect(self.get_success_url())
        return super(SignupView, self).get(request, *args, **kwargs)


class SignupValidateView(TemplateView):
    template_name = "hosting/signup_validate.html"

    def get_context_data(self, **kwargs):
        context = super(SignupValidateView, self).get_context_data(**kwargs)
        login_url = '<a href="' + \
                    reverse('hosting:login') + '">' + str(_('login')) + '</a>'
        home_url = '<a href="' + \
                   reverse('hosting:login') + '">Data Center Light</a>'
        message = '{signup_success_message} {lurl}</a> \
                 <br />{go_back} {hurl}.'.format(
            signup_success_message=_(
                'Thank you for signing up. We have sent an email to you. '
                'Please follow the instructions in it to activate your '
                'account. Once activated, you can login using'),
            go_back=_('Go back to'),
            lurl=login_url,
            hurl=home_url
        )
        context['message'] = mark_safe(message)
        context['section_title'] = _('Sign up')
        return context


class SignupValidatedView(SignupValidateView):
    template_name = "hosting/signup_validate.html"

    def get_context_data(self, **kwargs):
        context = super(SignupValidateView, self).get_context_data(**kwargs)
        validated = CustomUser.validate_url(self.kwargs['validate_slug'])
        login_url = '<a href="' + \
                    reverse('hosting:login') + '">' + str(_('login')) + '</a>'
        section_title = _('Account activation')
        user = CustomUser.objects.filter(
            validation_slug=self.kwargs['validate_slug']).first()
        if validated:
            message = ('{account_activation_string} <br />'
                       ' {login_string} {lurl}.').format(
                account_activation_string=_(
                    "Your account has been activated."),
                login_string=_("You can now"),
                lurl=login_url)
            email_data = {
                'subject': _('Welcome to Data Center Light!'),
                'to': user.email,
                'context': {
                    'base_url': "{0}://{1}".format(
                        self.request.scheme,
                        self.request.get_host()
                    )
                },
                'template_name': 'welcome_user',
                'template_path': 'datacenterlight/emails/',
                'from_address': settings.DCL_SUPPORT_FROM_ADDRESS,
            }
            email = BaseEmail(**email_data)
            email.send()
        else:
            home_url = '<a href="' + \
                       reverse('hosting:login') + \
                       '">Data Center Light</a>'
            message = '{sorry_message} <br />{go_back_to} {hurl}'.format(
                sorry_message=_("Sorry. Your request is invalid."),
                go_back_to=_('Go back to'),
                hurl=home_url
            )
        context['message'] = mark_safe(message)
        context['section_title'] = section_title
        return context

    @method_decorator(decorators)
    def get(self, request, *args, **kwargs):
        if self.request.user.is_authenticated:
            return HttpResponseRedirect(reverse_lazy('hosting:dashboard'))
        return super(SignupValidatedView, self).get(request, *args, **kwargs)


class ResendActivationEmailView(ResendActivationLinkViewMixin):
    template_name = 'hosting/resend_activation_link.html'
    form_class = ResendActivationEmailForm
    success_url = reverse_lazy('hosting:login')
    email_template_path = 'datacenterlight/emails/'
    email_template_name = 'user_activation'


class PasswordResetView(PasswordResetViewMixin):
    site = 'dcl'
    template_name = 'hosting/reset_password.html'
    form_class = PasswordResetRequestForm
    success_url = reverse_lazy('hosting:login')
    template_email_path = 'hosting/emails/'


class PasswordResetConfirmView(PasswordResetConfirmViewMixin):
    template_name = 'hosting/confirm_reset_password.html'
    success_url = reverse_lazy('hosting:login')

    def post(self, request, uidb64=None, token=None, *arg, **kwargs):
        try:
            uid = urlsafe_base64_decode(uidb64)
            user = CustomUser.objects.get(pk=uid)

            # opennebula_client = OpenNebulaManager(
            #     email=user.username,
            #     password=user.password,
            # )

        except (TypeError, ValueError, OverflowError, CustomUser.DoesNotExist):
            user = None
            opennebula_client = None

        form = self.form_class(request.POST)

        if user is not None and default_token_generator.check_token(user,
                                                                    token):
            if form.is_valid():
                ldap_manager = LdapManager()
                new_password = form.cleaned_data['new_password2']

                # Make sure the user have an ldap account already
                user.create_ldap_account(new_password)

                # We are changing password in ldap before changing in database because
                # ldap have more chances of failure than local database
                if ldap_manager.change_password(user.username, new_password):
                    user.set_password(new_password)
                    user.save()

                    messages.success(request, _('Password has been reset.'))

                    # Change opennebula password
                    opennebula_client.change_user_password(user.password)

                    return self.form_valid(form)

            messages.error(
                request, _('Password reset has not been successful.'))
            form.add_error(None,
                           _('Password reset has not been successful.'))
            return self.form_invalid(form)

        else:
            error_msg = _('The reset password link is no longer valid.')
            messages.error(request, _(error_msg))
            form.add_error(None, error_msg)
            return self.form_invalid(form)


class SSHKeyCreateView(FormView):
    form_class = UserHostingKeyForm
    model = UserHostingKey
    template_name = 'hosting/user_key.html'
    login_url = reverse_lazy('hosting:login')
    context_object_name = "virtual_machine"
    success_url = reverse_lazy('hosting:ssh_keys')

    def get_form_kwargs(self):
        kwargs = super(SSHKeyCreateView, self).get_form_kwargs()
        kwargs.update({'request': self.request})
        return kwargs

    def form_valid(self, form):
        form.save()
        if settings.DCL_SSH_KEY_NAME_PREFIX in form.instance.name:
            content = ContentFile(form.cleaned_data.get('private_key'))
            filename = form.cleaned_data.get(
                'name') + '_' + str(uuid.uuid4())[:8] + '_private.pem'
            form.instance.private_key.save(filename, content)
        context = self.get_context_data()

        next_url = self.request.session.get(
            'next',
            reverse_lazy('hosting:create_virtual_machine')
        )

        if 'next' in self.request.session:
            context.update({
                'next_url': next_url
            })
            del (self.request.session['next'])

        if form.cleaned_data.get('private_key'):
            context.update({
                'private_key': form.cleaned_data.get('private_key'),
                'key_name': form.cleaned_data.get('name'),
                'form': UserHostingKeyForm(request=self.request),
            })

        if self.request.user.is_authenticated:
            owner = self.request.user
            # manager = OpenNebulaManager(
            #     email=owner.username,
            #     password=owner.password
            # )
            # keys_to_save = get_all_public_keys(self.request.user)
            # manager.save_key_in_opennebula_user('\n'.join(keys_to_save))
        else:
            self.request.session["new_user_hosting_key_id"] = form.instance.id
        return HttpResponseRedirect(self.success_url)

    def post(self, request, *args, **kwargs):
        form = self.get_form()
        required = 'add_ssh' in self.request.POST
        form.fields['name'].required = required
        form.fields['public_key'].required = required
        if form.is_valid():
            return self.form_valid(form)
        else:
            return self.form_invalid(form)


class AskSSHKeyView(SSHKeyCreateView):
    form_class = UserHostingKeyForm
    template_name = "hosting/add_ssh_key.html"
    success_url = reverse_lazy('hosting:order_confirmation')
    context_object_name = "dcl_vm_buy_add_ssh_key"

    # @cache_control(no_cache=True, must_revalidate=True, no_store=True)
    def get(self, request, *args, **kwargs):
        context = {
            'site_url': reverse_lazy('hosting:login'),
            # 'cms_integration': get_cms_integration('default'),
            'form': UserHostingKeyForm(request=self.request),
            # 'keys': get_all_public_keys(self.request.user)
        }
        return render(request, self.template_name, context)

    def post(self, request, *args, **kwargs):
        self.success_url = self.request.session.get("order_confirm_url")
        return super(AskSSHKeyView, self).post(self, request, *args, **kwargs)


class IndexView(View):
    template_name = "hosting/index.html"

    def get_context_data(self, **kwargs):
        # TODO refactor below
        templates = []
        data = None

        context = {
            'hosting': "nodejs",
            'hosting_long': "NodeJS",
            'domain': "node-hosting.ch",
            'google_analytics': "UA-62285904-7",
            'email': "info@node-hosting.ch",
            'vm_types': data
            # 'vm_types': VirtualMachineType.get_serialized_vm_types(),
        }
        return context

    @method_decorator(decorators)
    def get(self, request, *args, **kwargs):
        context = self.get_context_data()
        return render(request, self.template_name, context)