from datetime import date, timedelta

from django.contrib.auth.decorators import login_required
from django.core.mail import send_mail
from django.db.models import DateTimeField, Q, Value
from django.http import HttpResponseRedirect
from django.template.loader import render_to_string
from django.urls import reverse, reverse_lazy
from django.utils import timezone
from django.utils.decorators import method_decorator
from django.views.generic.detail import DetailView
from django.views.generic.edit import FormView, UpdateView
from django.views.generic.list import ListView

from fiches.forms import (
    AddressFormSet,
    MailFormSet,
    PhoneFormSet,
    ProfileForm,
    SearchForm,
    SocialFormSet,
)
from fiches.models import Department, Profile
from fiches.utils import get_ldap_infos


@method_decorator(login_required, name="dispatch")
class FicheView(DetailView):
    model = Profile
    template_name = "fiches/fiche.html"
    slug_field = "user__username"


@method_decorator(login_required, name="dispatch")
class EditView(UpdateView):
    template_name = "fiches/fiches_modif.html"
    model = Profile
    form_class = ProfileForm

    def get(self, request, *args, **kwargs):
        self.object = self.get_object()
        form_class = self.get_form_class()
        form = self.get_form(form_class)
        phone_form = PhoneFormSet(instance=self.object)
        social_form = SocialFormSet(instance=self.object)
        mail_form = MailFormSet(instance=self.object)
        address_form = AddressFormSet(instance=self.object)
        return self.render_to_response(
            self.get_context_data(
                form=form,
                phone_form=phone_form,
                social_form=social_form,
                mail_form=mail_form,
                address_form=address_form,
            )
        )

    def post(self, request, *args, **kwargs):
        self.object = self.get_object()
        form_class = self.get_form_class()
        form = self.get_form(form_class)
        phone_form = PhoneFormSet(self.request.POST, instance=self.object)
        social_form = SocialFormSet(self.request.POST, instance=self.object)
        mail_form = MailFormSet(self.request.POST, instance=self.object)
        address_form = AddressFormSet(self.request.POST, instance=self.object)
        if (
            form.is_valid()
            and phone_form.is_valid()
            and social_form.is_valid()
            and mail_form.is_valid()
            and address_form.is_valid()
        ):
            return self.form_valid(
                form, phone_form, social_form, mail_form, address_form
            )
        else:
            return self.form_invalid(
                form, phone_form, social_form, mail_form, address_form
            )

    def form_valid(self, form, phone_form, social_form, mail_form, address_form):
        self.object = form.save()
        phone_form.save()
        social_form.save()
        mail_form.save()
        address_form.save()
        send_mail(
            "Fiche annuaire modifée",
            render_to_string(
                "fiches/mail/mail_modif.txt", {"profile": self.get_object()}
            ),
            "klub-dev@ens.psl.eu",
            ["{}@clipper.ens.psl.eu".format(self.get_object().user.username)],
            fail_silently=False,
        )
        return HttpResponseRedirect(self.get_success_url())

    def form_invalid(self, form, phone_form, social_form, mail_form, address_form):
        return self.render_to_response(
            self.get_context_data(
                form=form,
                phone_form=phone_form,
                social_form=social_form,
                mail_form=mail_form,
                address_form=address_form,
            )
        )

    def get_context_data(self, **kwargs):
        context = super().get_context_data(**kwargs)
        today = date.today()
        context["default_birth_date"] = today.replace(
            year=(today.year - 20)
        ).isoformat()
        return context

    def get_object(self):
        return self.request.user.profile

    def get_success_url(self):
        return reverse("fiche", args=(self.get_object().user,))


@method_decorator(login_required, name="dispatch")
class HomeView(FormView):
    model = Profile
    template_name = "fiches/home.html"
    form_class = SearchForm

    def form_valid(self, form):
        name = form.cleaned_data["name"]
        promotion = form.cleaned_data["year"]
        depts = form.cleaned_data["department"]
        result = Profile.objects.filter(
            Q(full_name__icontains=name)
            | Q(nickname__icontains=name)
            | Q(user__username__icontains=name)
        )

        if depts:
            result = result.filter(department__in=depts)

        if promotion:
            result = result.filter(promotion=promotion)

        return self.render_to_response(self.get_context_data(result=result))


@method_decorator(login_required, name="dispatch")
class BirthdayView(ListView):
    model = Profile
    template_name = "fiches/birthday.html"

    def get_context_data(self, **kwargs):
        context = super().get_context_data(**kwargs)
        today = timezone.now()
        context["result"] = list(
            Profile.objects.filter(
                birth_date__day=today.day, birth_date__month=today.month
            ).annotate(day=Value(today, output_field=DateTimeField()))
        )
        for _ in range(1, 7):
            today = today + timedelta(days=1)
            context["result"] += list(
                Profile.objects.filter(
                    birth_date__day=today.day, birth_date__month=today.month
                ).annotate(day=Value(today, output_field=DateTimeField()))
            )
        return context


@method_decorator(login_required, name="dispatch")
class ResetView(UpdateView):
    model = Profile
    template_name = "fiches/reset.html"
    fields = []
    success_url = reverse_lazy("fiche_modif")

    def get_object(self):
        return self.request.user.profile

    def post(self, request, *args, **kwargs):
        if "reset" in request.POST:
            # On réinitialise le profil
            profile = self.get_object()
            base_infos = get_ldap_infos(profile.user.cas_account.cas_login)

            # On supprime les trucs inutiles
            profile.phone_set.all().delete()
            profile.social_set.all().delete()
            profile.mail_set.all().delete()
            profile.address_set.all().delete()
            profile.nickname = ""
            profile.pronoun = ""
            profile.birth_date = None
            profile.past_studies = ""
            profile.experiences = ""
            profile.thurne = ""
            profile.text_field = ""
            profile.picture.delete()

            # On réinitialise avec les infos du LDAP
            if base_infos is not None:
                profile.full_name = base_infos["name"]
                profile.department.clear()
                profile.department.add(Department.objects.get(name=base_infos["dept"]))
                profile.promotion = base_infos["promo"]
            profile.save()

        return HttpResponseRedirect(self.success_url)