# -*- coding: utf-8 -*-

from ldap3 import Connection

from django import shortcuts
from django.http import Http404
from django.db.models import Q
from django.contrib.auth.models import User, Group
from .decorators import buro_required
from django.conf import settings


class Clipper(object):
    def __init__(self, clipper, fullname):
        self.clipper = clipper
        self.fullname = fullname


@buro_required
def autocomplete(request):
    if "q" not in request.GET:
        raise Http404
    q = request.GET['q']
    data = {'q': q}
    cof_members = Group.objects.get(name="cof_members")

    queries = {}
    bits = q.split()

    # Fetching data from User and Profile tables
    queries['members'] = User.objects.filter(groups=cof_members)
    queries['users'] = User.objects.exclude(groups=cof_members)
    for bit in bits:
        queries['members'] = queries['members'].filter(
                 Q(first_name__icontains=bit)
                 | Q(last_name__icontains=bit)
                 | Q(username__icontains=bit)
                 | Q(profile__login_clipper__icontains=bit))
        queries['users'] = queries['users'].filter(
            Q(first_name__icontains=bit)
            | Q(last_name__icontains=bit)
            | Q(username__icontains=bit))
    queries['members'] = queries['members'].distinct()
    queries['users'] = queries['users'].distinct()

    # Clearing redundancies
    usernames = (
        set(queries['members'].values_list('profile__login_clipper',
                                           flat='True'))
        | set(queries['users'].values_list('profile__login_clipper',
                                           flat='True'))
    )

    # Fetching data from the SPI
    if hasattr(settings, 'LDAP_SERVER_URL'):
        # Fetching
        ldap_query = '(|{:s})'.format(''.join(
            ['(cn=*{bit:s}*)(uid=*{bit:s}*)'.format(bit=bit)
             for bit in bits]
        ))
        with Connection(settings.LDAP_SERVER_URL) as conn:
            conn.search(
                'dc=spi,dc=ens,dc=fr', ldap_query,
                attributes=['uid', 'cn']
            )
            queries['clippers'] = conn.entries
        # Clearing redundancies
        queries['clippers'] = [
            Clipper(clipper.uid, clipper.cn)
            for clipper in queries['clippers']
            if str(clipper.uid) not in usernames
        ]

    # Resulting data
    data.update(queries)
    data['options'] = any(bool(query) for query in queries.values())

    return shortcuts.render(request, "cof/autocomplete_user.html", data)