# coding: utf-8

from django.shortcuts import render, redirect, get_object_or_404

from django.views.generic import DetailView, ListView
from django.views.generic.edit import UpdateView, CreateView
from django import forms
from django.urls import reverse
from django.contrib.admin.views.decorators import staff_member_required
from django.contrib.auth.decorators import login_required
from braces.views import LoginRequiredMixin
from django.http import JsonResponse, HttpResponseForbidden, Http404
from django.core.mail import send_mail
from django.db.models import Q, Count
from collections import Counter, defaultdict

from .models import Normalien, Stage, Lieu, AvisLieu, AvisStage
from .forms import StageForm, LieuForm, AvisStageForm, AvisLieuForm, FeedbackForm
from .utils import en_scolarite

from .views_search import *

import random, math

#
# LECTURE
#

# Page d'accueil
def index(request):
    num_stages = Stage.objects.filter(public=True).count()
    return render(request, 'avisstage/index.html',
                  {"num_stages": num_stages})

# Espace personnel
@login_required
def perso(request):
    return render(request, 'avisstage/perso.html')

# 403 Archicubes
@login_required
def archicubes_interdits(request):
    return render(request, 'avisstage/403-archicubes.html')

# Profil
#login_required
class ProfilView(LoginRequiredMixin, DetailView):
    model = Normalien
    template_name = 'avisstage/detail/profil.html'

    # Récupération du profil
    def get_object(self):
        
        # Restriction d'accès pour les archicubes
        if (en_scolarite(self.request.user) or
            self.kwargs.get('username') == self.request.user.username):
            return get_object_or_404(
                Normalien, user__username=self.kwargs.get('username'))
        else:
            raise Http404

# Stage
#login_required
class StageView(LoginRequiredMixin, DetailView):
    model = Stage
    template_name = 'avisstage/detail/stage.html'

    # Restriction aux stages publics ou personnels
    def get_queryset(self):
        filtre = Q(auteur__user_id=self.request.user.id)
        
        # Restriction d'accès pour les archicubes
        if en_scolarite(self.request.user):
            filtre |= Q(public=True)

        return Stage.objects.filter(filtre)


# FAQ
def faq(request):
    return render(request, 'avisstage/faq.html')

#
# EDITION
#

# Profil
#login_required
class ProfilEdit(LoginRequiredMixin, UpdateView):
    model = Normalien
    fields = ['nom', 'promotion', 'contactez_moi', 'bio']
    template_name = 'avisstage/formulaires/profil.html'

    # Limitation à son propre profil
    def get_object(self):
        return self.request.user.profil
    
    def get_success_url(self):
        return reverse('avisstage:perso')

# Stage
@login_required
def manage_stage(request, pk=None):
    # Objet de base
    last_maj = None
    if pk is None:
        stage = Stage(auteur=request.user.profil)
        avis_stage = AvisStage(stage=stage)
        c_del = False
        last_creation = Stage.objects.filter(auteur=request.user.profil)\
                                     .order_by("-date_creation")[:1]
        if len(last_creation) != 0:
            last_maj = last_creation[0].date_creation
    else:
        try:
            stage = Stage.objects.filter(auteur=request.user.profil).get(pk=pk)
        except Stage.DoesNotExist:
            return HttpResponseForbidden()
        last_maj = stage.date_maj
        avis_stage, _ = AvisStage.objects.get_or_create(stage=stage)
        c_del = True

    # Formset pour les avis des lieux
    AvisLieuFormSet = forms.inlineformset_factory(
        Stage, AvisLieu, form=AvisLieuForm, can_delete=c_del, extra=0)

    if request.method == "POST":
        # Lecture des données
        form = StageForm(request.POST, request=request, instance=stage, prefix="stage")
        avis_stage_form = AvisStageForm(request.POST,
                                        instance=avis_stage, prefix="avis")
        avis_lieu_formset = AvisLieuFormSet(request.POST, instance=stage,
                                         prefix="lieux")

        # Validation et enregistrement
        if (form.is_valid() and
            avis_stage_form.is_valid() and
            avis_lieu_formset.is_valid()):
            stage = form.save()
            avis_stage_form.instance.stage = stage
            avis_stage_form.save()
            avis_lieu_formset.save()
            #print(request.POST)
            if "continuer" in request.POST:
                if pk is None:
                    return redirect(reverse('avisstage:stage_edit',kwargs={'pk':stage.id}))
            else:
                return redirect(reverse('avisstage:stage',
                                        kwargs={'pk':stage.id}))
    else:
        form = StageForm(instance=stage, prefix="stage")
        avis_stage_form = AvisStageForm(instance=avis_stage, prefix="avis")
        avis_lieu_formset = AvisLieuFormSet(instance=stage, prefix="lieux")

    # Affichage du formulaire
    return render(request, "avisstage/formulaires/stage.html",
                  {'form': form, 'avis_stage_form': avis_stage_form,
                   'avis_lieu_formset': avis_lieu_formset,
                   'creation': pk is None, "last_maj": last_maj})

# Ajout d'un lieu de stage
#login_required

# Stage
@login_required
def save_lieu(request):
    normalien = request.user.profil
    
    if request.method == "POST":
        pk = request.POST.get("id", None)
        #print(request.POST)
        jitter = False
        if pk is None or pk == '':
            lieu = Lieu()
        else:
            # Modification du lieu
            lieu = get_object_or_404(Lieu, pk=pk)

            # On regarde si les stages associés à ce lieu "appartiennent" tous à l'utilisateur
            not_same_user = lieu.stages.exclude(auteur=normalien).count()

            # Si d'autres personnes ont un stage à cet endroit, on crée un nouveau lieu, un peu à côté
            if not_same_user > 0:
                lieu = Lieu()
                # Servira à bouger un peu le lieu
                jitter = True
        
        # Lecture des données
        form = LieuForm(request.POST, instance=lieu)

        # Validation et enregistrement
        if form.is_valid():
            lieu = form.save(commit=False)
            if jitter:
                cdx, cdy = lieu.coord.get_coords()
                ang = random.random() * 6.29;
                rad = (random.random() + 0.5) * 3e-4
                cdx += math.cos(ang) * rad;
                cdy += math.sin(ang) * rad;
                lieu.coord.set_coords((cdx, cdy))
                lieu.save()

            # Élimination des doublons
            if pk is None or pk == "":
                olieux = Lieu.objects.filter(nom=lieu.nom, coord__distance_lte=(lieu.coord, 10))
                for olieu in olieux:
                    if olieu.type_lieu == lieu.type_lieu and \
                       olieu.ville == lieu.ville and \
                       olieu.pays == lieu.pays:
                        return JsonResponse({"success": True, "id": olieu.id})
            
            lieu.save()
            return JsonResponse({"success": True, "id": lieu.id})
        else:
            return JsonResponse({"success": False,
                                 "errors": form.errors})
    else:
        return JsonResponse({"erreur": "Aucune donnée POST"})

class LieuAjout(LoginRequiredMixin, CreateView):
    model = Lieu
    form_class = LieuForm
    template_name = 'avisstage/formulaires/lieu.html'

    # Retourne d'un JSON si requête AJAX
    def form_valid(self, form):
        if self.request.GET.get("format", "") == "json":
            self.object = form.save()
            return JsonResponse({"success": True,
                                 "id": self.object.id})
        else:
            super(LieuAjout, self).form_valid(form)

    def form_invalid(self, form):
        if self.request.GET.get("format", "") == "json":
            return JsonResponse({"success": False,
                                 "errors": form.errors})
        else:
            super(LieuAjout, self).form_valid(form)

# Passage d'un stage en mode public
@login_required
def publier_stage(request, pk):
    if request.method != "POST":
        return HttpResponseForbidden()
    stage = get_object_or_404(Stage, pk=pk)

    # Stage non possédé par l'utilisateur
    if stage.auteur != request.user.profil:
        return HttpResponseForbidden()

    # Mise à jour du statut
    if "publier" in request.POST:
        stage.public = True
    else:
        stage.public = False

    stage.save()
    
    return redirect(reverse("avisstage:stage", kwargs={"pk": pk}))

#
# FEEDBACK
#

@login_required
def feedback(request):
    if request.method == "POST":
        form = FeedbackForm(request.POST)
        if form.is_valid():
            objet   = form.cleaned_data['objet']
            message = form.cleaned_data['message']
            send_mail(
                "[experiENS] "+ objet,
                message,
                request.user.username + "@clipper.ens.fr",
                ['champeno@clipper.ens.fr'],
                fail_silently=False,
            )
            if request.GET.get("format", None) == "json":
                return JsonResponse({"success": True})
            return redirect(reverse("avisstage:index"))
        else:
            if request.GET.get("format", None) == "json":
                return JsonResponse({"success": False,
                                     "errors": form.errors})
    else:
        form = FeedbackForm()
    raise Http404()


#
# STATISTIQUES
#

@login_required
@staff_member_required
def statistiques(request):
    nstages = Stage.objects.count()
    npubstages = Stage.objects.filter(public=True).count()
    nbymatiere_raw = Stage.objects.values('matieres__nom', 'public').annotate(scount=Count('matieres__nom'))
    nbymatiere = defaultdict(dict)
    for npm in nbymatiere_raw:
        nbymatiere[npm["matieres__nom"]]["publics" if npm["public"] else "drafts"] = npm["scount"]
    for mat, npm in nbymatiere.items():
        npm["matiere"] = mat
    nbymatiere = sorted(list(nbymatiere.values()), key=lambda npm: -npm.get("publics", 0))
    nbylength = [("Vide", Stage.objects.filter(len_avis_stage__lt=5).count(),
                  Stage.objects.filter(len_avis_lieux__lt=5).count()),
                 ("Court", Stage.objects.filter(len_avis_stage__lt=30, len_avis_stage__gt=4).count(),
                  Stage.objects.filter(len_avis_lieux__lt=30, len_avis_lieux__gt=4).count()),
                 ("Moyen", Stage.objects.filter(len_avis_stage__lt=100, len_avis_stage__gt=29).count(),
                  Stage.objects.filter(len_avis_lieux__lt=100, len_avis_lieux__gt=29).count()),
                 ("Long", Stage.objects.filter(len_avis_stage__gt=99).count(),
                  Stage.objects.filter(len_avis_lieux__gt=99).count())]
    nusers = Normalien.objects.count()
    nauts = Normalien.objects.filter(stages__isnull=False).distinct().count()
    nbyaut = Counter(Normalien.objects.filter(stages__isnull=False).annotate(scount=Count('stages')).values_list('scount', flat="True")).items()
    nlieux = Lieu.objects.filter(stages__isnull=False).distinct().count()
    return render(request, 'avisstage/moderation/statistiques.html',
                  {'num_stages': nstages,
                   'num_stages_pub': npubstages,
                   'num_par_matiere': nbymatiere,
                   'num_users': nusers,
                   'num_auteurs': nauts,
                   'num_par_auteur': nbyaut,
                   'num_lieux_utiles': nlieux,
                   'num_par_longueur': nbylength,
                  })