# coding: utf-8

from django.shortcuts import render, redirect, get_object_or_404
from django.contrib.auth.decorators import login_required

from django import forms
from django.db.models import Q

from .documents import StageDocument
from .models import Stage
from .statics import TYPE_LIEU_OPTIONS, TYPE_STAGE_OPTIONS, NIVEAU_SCOL_OPTIONS

from datetime import date

# Recherche
class SearchForm(forms.Form):
    generique = forms.CharField(required=False)
    sujet = forms.CharField(label=u'À propos de', required=False)
    contexte = forms.CharField(label=u'Contexte (lieu, encadrant⋅e⋅s, structure)',
                               required=False)
    
    apres_annee = forms.IntegerField(label=u'Après cette année', required=False)
    avant_annee = forms.IntegerField(label=u'Avant cette année', required=False)

    type_stage = forms.ChoiceField(label="Type de stage", choices=([('', u'')]
                                            + list(TYPE_STAGE_OPTIONS)),
                                   required=False)
    niveau_scol = forms.ChoiceField(label="Année d'étude", choices=([('', u'')]
                                            + list(NIVEAU_SCOL_OPTIONS)),
                                    required=False)
    
    type_lieu = forms.ChoiceField(label=u"Type de lieu d'accueil",
                                  choices=([('', u'')]
                                           + list(TYPE_LIEU_OPTIONS)),
                                  required=False)
    tri = forms.ChoiceField(label=u'Tri par',
                            choices=[('pertinence', u'Pertinence'),
                                     ('-date_maj',u'Dernière mise à jour')],
                            required=False, initial='pertinence')


def cherche(**kwargs):
    filtres = Q(public=True)
    dsl = StageDocument.search()

    use_dsl = False

    def field_relevant(field, test_string=True):
        return field in kwargs and \
            kwargs[field] is not None and \
            ((not test_string) or kwargs[field].strip() != '')

    #
    # Recherche libre
    #
    
    # Champ générique : recherche dans tous les champs
    if field_relevant("generique"):
        #print "Filtre generique", kwargs['generique']
        dsl = dsl.query(
            "match",
            _all={"query": kwargs["generique"],
                  "fuzziness": "auto"})
        use_dsl = True

    # Sujet -> Recherche dan les noms de sujets et les thématiques
    if field_relevant("sujet"):
        dsl = dsl.query("multi_match",
                         query = kwargs["sujet"],
                         fields = ['sujet^2', 'thematiques', 'matieres'],
                         fuzziness = "auto")
        use_dsl = True

    # Contexte -> Encadrants, structure, lieu
    if field_relevant("contexte"):
        dsl = dsl.query("multi_match",
                        query = kwargs["contexte"],
                        fields = ['encadrants', 'structure^2',
                                  'lieux.nom', 'lieux.pays', 'lieux.ville'],
                        fuzziness = "auto")
        use_dsl = True

    #
    # Filtres directs db
    #
    
    # Dates
    if field_relevant('avant_annee', False):
        dte = date(kwargs['avant_annee']+1, 1, 1)
        filtres &= Q(date_fin__lt=dte)

    if field_relevant('apres_annee', False):
        dte = date(kwargs['apres_annee'], 1, 1)
        filtres &= Q(date_debut__gte=dte)

    # Type de stage
    if field_relevant('type_stage'):
        filtres &= Q(type_stage=kwargs["type_stage"])
        
    if field_relevant('niveau_scol'):
        filtres &= Q(niveau_scol=kwargs["niveau_scol"])

    # Type de lieu
    if field_relevant('type_lieu'):
        filtres &= Q(lieux__type_lieu=kwargs["type_lieu"])

        
    # Application
    if use_dsl:
        filtres &= Q(id__in=[s.meta.id for s in dsl.scan()])

    #print filtres
    resultat = Stage.objects.filter(filtres)
    tri = 'pertinence'

    if not use_dsl:
        kwargs['tri'] = '-date_maj'
        
    if field_relevant('tri') and kwargs['tri'] != 'pertinence':
        tri = kwargs['tri']
        resultat = resultat.order_by(kwargs['tri'])

    return resultat, tri

@login_required
def recherche(request):
    form = SearchForm()
    return render(request, 'avisstage/recherche/recherche.html',
                  {"form": form})

@login_required
def recherche_resultats(request):
    stages = []
    tri = ''
    vue = 'vue-liste'
    lieux = []
    if request.method == "GET":
        form = SearchForm(request.GET)
        if form.is_valid():
            stages, tri = cherche(**form.cleaned_data)
            stages = stages.prefetch_related('lieux', 'auteur', 'matieres', 'thematiques')
            lieux = [[stageid, lieuid] for (stageid, lieuid) in stages.values_list('id', 'lieux') if lieuid is not None]
    else:
        form = SearchForm()
    if stages:
        vue = 'vue-hybride'
    return render(request, 'avisstage/recherche/resultats.html',
                  {"form": form, "stages":stages,
                   "tri": tri, "vue": vue, "lieux": lieux})