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

from ldap3 import Connection

from django.shortcuts import render
from django.http import Http404
from django.db.models import Q
from django.conf import settings
from django.contrib.auth.models import User

from kfet.decorators import teamkfet_required
from kfet.models import Account


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


@teamkfet_required
def account_create(request):
    if "q" not in request.GET:
        raise Http404
    q = request.GET.get("q")

    if (len(q) == 0):
        return render(request, "kfet/account_create_autocomplete.html")

    data = {'q': q}

    queries = {}
    search_words = q.split()

    # Fetching data from User, CofProfile and Account tables
    queries['kfet'] = Account.objects
    queries['users_cof'] = User.objects.filter(profile__cof__is_cof=True)
    queries['users_notcof'] = User.objects.filter(profile__cof__is_cof=False)

    for word in search_words:
        queries['kfet'] = queries['kfet'].filter(
                Q(profile__user__username__icontains=word)
                | Q(profile__user__first_name__icontains=word)
                | Q(profile__user__last_name__icontains=word)
            )
        queries['users_cof'] = queries['users_cof'].filter(
            Q(username__icontains=word)
            | Q(first_name__icontains=word)
            | Q(last_name__icontains=word)
        )
        queries['users_notcof'] = queries['users_notcof'].filter(
            Q(username__icontains=word)
            | Q(first_name__icontains=word)
            | Q(last_name__icontains=word)
        )

    # Clearing redundancies
    queries['kfet'] = queries['kfet'].distinct()
    usernames = set(
        queries['kfet'].values_list('profile__user__username', flat=True))
    queries['kfet'] = [
        (account, account.profile.user)
        for account in queries['kfet']
    ]

    queries['users_cof'] = \
        queries['users_cof'].exclude(username__in=usernames).distinct()
    queries['users_notcof'] = \
        queries['users_notcof'].exclude(username__in=usernames).distinct()
    usernames |= set(
        queries['users_cof'].values_list('username', flat=True))
    usernames |= set(
        queries['users_notcof'].values_list('username', 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 search_words]
        ))
        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'] = sum([len(query) for query in queries])

    return render(request, "kfet/account_create_autocomplete.html", data)