# 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
from django.core.mail import send_mail
from django.db.models import Q, Count
from collections import Counter

from avisstage.models import Normalien, Stage, Lieu, AvisLieu, AvisStage
from avisstage.forms import StageForm, LieuForm, AvisStageForm, AvisLieuForm, FeedbackForm
from avisstage.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')

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

    # Récupération du profil
    def get_object(self):
        return Normalien.objects.get(user__username=self.kwargs.get('username'))

# 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) | Q(public=True)
        return Stage.objects.filter(filtre)


# Liste des stages par dernière modification
#login_required
class StageListe(LoginRequiredMixin, ListView):
    model = Stage
    template_name = 'avisstage/recherche/stage.html'
    
    def get_queryset(self):
        return Stage.objects.filter(public=True).order_by('-date_maj')

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

#
# EDITION
#

# Profil
#login_required
class ProfilEdit(LoginRequiredMixin, UpdateView):
    model = Normalien
    fields = ['nom', 'promotion', 'mail', '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
    if pk is None:
        stage = Stage(auteur=request.user.profil)
        avis_stage = AvisStage(stage=stage)
        c_del = False
    else:
        try:
            stage = Stage.objects.filter(auteur=request.user.profil).get(pk=pk)
        except Stage.DoesNotExist:
            return HttpResponseForbidden()
        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})

# 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()
            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()
            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()
    return render(request, 'avisstage/formulaire/feedback.html', {"form": form})


#
# STATISTIQUES
#

@login_required
@staff_member_required
def statistiques(request):
    nstages = Stage.objects.count()
    npubstages = Stage.objects.filter(public=True).count()
    nbymatiere = Stage.objects.values('matieres__nom').annotate(scount=Count('matieres__nom'))
    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})