# coding: utf-8

from tastypie.resources import ModelResource
from tastypie.authentication import SessionAuthentication
from tastypie import fields, utils

from django.contrib.gis import geos
from django.urls import reverse

from .models import Lieu, Stage, Normalien, StageMatiere

# API principale pour les lieux
class LieuResource(ModelResource):
    stages = fields.ToManyField("avisstage.api.StageResource",
                                "stages", use_in="detail", full=True)
    
    class Meta:
        queryset = Lieu.objects.all()
        resource_name = "lieu"
        fields = ["nom", "ville", "pays", "coord", "type_lieu", "id"]
        
        #login_required
        authentication = SessionAuthentication()

    # Filtres personnalisés
    def build_filters(self, filters=None, **kwargs):
        if filters is None:
            filters = {}
        orm_filters = super(LieuResource, self).build_filters(filters, **kwargs)

        # Trouver les lieux à proximités d'un point donné
        if "lng" in filters and "lat" in filters:
            lat = float(filters['lat'])
            lng = float(filters['lng'])
            pt = geos.Point((lng,lat), srid=4326)
            self.reference_point = pt
            orm_filters['coord__distance_lte'] = (pt, 50)

        # Filtrer les lieux qui ont déjà des stages
        if "has_stage" in filters:
            orm_filters['stages__public'] = True
            
        return orm_filters

    # Custom apply filters pour ajouter le "distinct"
    def apply_filters(self, request, applicable_filters):
        return self.get_object_list(request).filter(**applicable_filters).distinct()
    
    # Ajout d'informations
    def dehydrate(self, bundle):
        bundle = super(LieuResource, self).dehydrate(bundle)
        
        obj = bundle.obj
        bundle.data['coord'] = {'lat': float(obj.coord.y),
                                'lng': float(obj.coord.x)}

        # Distance au point recherché (inutile en fait)
        #if "lat" in bundle.request.GET and "lng" in bundle.request.GET:
        #    bundle.data['distance'] = self.reference_point.distance(bundle.obj.coord)
        
        # Autres infos utiles
        bundle.data["pays_nom"] = obj.get_pays_display()
        bundle.data["type_lieu_nom"] = obj.type_lieu_fancy
        # TODO use annotate?
        bundle.data["num_stages"] = obj.stages.filter(public=True).count() 

        return bundle

# API sur un stage
class StageResource(ModelResource):
    class Meta:
        queryset = Stage.objects.filter(public=True)
        resource_name = "stage"
        fields = ["sujet", "date_debut", "date_fin", "matieres", "id"]

        #login_required
        authentication = SessionAuthentication()

    # Filtres personnalisés
    def build_filters(self, filters=None, **kwargs):
        if filters is None:
            filters = {}
        orm_filters = super(StageResource, self).build_filters(filters, **kwargs)

        # Récupération des stages à un lieu donné
        if "lieux" in filters:
            flieux = map(int, filters['lieux'].split(','))
            orm_filters['lieux__id__in'] = flieux
        
        return orm_filters

    # Informations à ajouter
    def dehydrate(self, bundle):
        bundle = super(StageResource, self).dehydrate(bundle)
        obj = bundle.obj

        # Affichage des manytomany en condensé
        bundle.data['auteur'] = obj.auteur.nom
        bundle.data['thematiques'] = list(obj.thematiques.all().values_list("name", flat=True))
        bundle.data['matieres'] = list(obj.matieres.all().values_list("nom", flat=True))
        
        # Adresse de la fiche de stage
        bundle.data['url'] = reverse("avisstage:stage", kwargs={"pk": obj.id});
        return bundle

# Auteurs des fiches (TODO supprimer ?)
class AuteurResource(ModelResource):
    stages = fields.ToManyField("avisstage.api.StageResource",
                                "stages", use_in="detail")
    
    class Meta:
        queryset = Normalien.objects.all()
        resource_name = "profil"
        fields = ["id", "nom", "stages"]

        #login_required
        authentication = SessionAuthentication()