# -*- mode: python; coding: utf-8 -*-
# Re2o est un logiciel d'administration développé initiallement au rezometz. Il
# se veut agnostique au réseau considéré, de manière à être installable en
# quelques clics.
#
# Copyright © 2017  Gabriel Détraz
# Copyright © 2017  Goulven Kermarec
# Copyright © 2017  Augustin Lemesle
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

# -*- coding: utf-8 -*-
# David Sinquin, Gabriel Détraz, Goulven Kermarec
"""
Regroupe les fonctions transversales utiles

Fonction :
    - récupérer tous les utilisateurs actifs
    - récupérer toutes les machines
    - récupérer tous les bans
    etc
"""


from __future__ import unicode_literals

from django.utils import timezone
from django.db.models import Q
from django.core.paginator import Paginator, EmptyPage, PageNotAnInteger

from cotisations.models import Cotisation, Facture, Vente
from machines.models import Interface, Machine
from users.models import Adherent, User, Ban, Whitelist

# Mapping of srtftime format for better understanding
# https://docs.python.org/3.6/library/datetime.html#strftime-strptime-behavior
datetime_mapping={
    '%a': '%a',
    '%A': '%A',
    '%w': '%w',
    '%d': 'dd',
    '%b': '%b',
    '%B': '%B',
    '%m': 'mm',
    '%y': 'yy',
    '%Y': 'yyyy',
    '%H': 'HH',
    '%I': 'HH(12h)',
    '%p': 'AMPM',
    '%M': 'MM',
    '%S': 'SS',
    '%f': 'µµ',
    '%z': 'UTC(+/-HHMM)',
    '%Z': 'UTC(TZ)',
    '%j': '%j',
    '%U': 'ww',
    '%W': 'ww',
    '%c': '%c',
    '%x': '%x',
    '%X': '%X',
    '%%': '%%',
}


def convert_datetime_format(format):
    i=0
    new_format = ""
    while i < len(format):
        if format[i] == '%':
            char = format[i:i+2]
            new_format += datetime_mapping.get(char, char)
            i += 2
        else:
            new_format += format[i]
            i += 1
    return new_format


def all_adherent(search_time=None):
    """ Fonction renvoyant tous les users adherents. Optimisee pour n'est
    qu'une seule requete sql
    Inspecte les factures de l'user et ses cotisation, regarde si elles
    sont posterieur à now (end_time)"""
    if search_time is None:
        search_time = timezone.now()
    return User.objects.filter(
        facture__in=Facture.objects.filter(
            vente__in=Vente.objects.filter(
                Q(type_cotisation='All') | Q(type_cotisation='Adhesion'),
                cotisation__in=Cotisation.objects.filter(
                    vente__in=Vente.objects.filter(
                        facture__in=Facture.objects.all().exclude(valid=False)
                    )
                ).filter(date_end__gt=search_time)
            )
        )
    ).distinct()


def all_baned(search_time=None):
    """ Fonction renvoyant tous les users bannis """
    if search_time is None:
        search_time = timezone.now()
    return User.objects.filter(
        ban__in=Ban.objects.filter(
            date_end__gt=search_time
        )
    ).distinct()


def all_whitelisted(search_time=None):
    """ Fonction renvoyant tous les users whitelistes """
    if search_time is None:
        search_time = timezone.now()
    return User.objects.filter(
        whitelist__in=Whitelist.objects.filter(
            date_end__gt=search_time
        )
    ).distinct()


def all_has_access(search_time=None):
    """  Renvoie tous les users beneficiant d'une connexion
    : user adherent ou whiteliste et non banni """
    if search_time is None:
        search_time = timezone.now()
    return User.objects.filter(
        Q(state=User.STATE_ACTIVE) &
        ~Q(ban__in=Ban.objects.filter(date_end__gt=search_time)) &
        (Q(whitelist__in=Whitelist.objects.filter(date_end__gt=search_time)) |
         Q(facture__in=Facture.objects.filter(
             vente__in=Vente.objects.filter(
                 cotisation__in=Cotisation.objects.filter(
                     Q(type_cotisation='All') | Q(type_cotisation='Connexion'),
                     vente__in=Vente.objects.filter(
                         facture__in=Facture.objects.all()
                         .exclude(valid=False)
                     )
                 ).filter(date_end__gt=search_time)
             )
         )))
    ).distinct()


def filter_active_interfaces(interface_set):
    """Filtre les machines autorisées à sortir sur internet dans une requête"""
    return (interface_set
            .filter(
                machine__in=Machine.objects.filter(
                    user__in=all_has_access()
                ).filter(active=True)
            ).select_related('domain')
            .select_related('machine')
            .select_related('type')
            .select_related('ipv4')
            .select_related('domain__extension')
            .select_related('ipv4__ip_type')
            .distinct())


def filter_complete_interfaces(interface_set):
    """Appel la fonction précédente avec un prefetch_related ipv6 en plus"""
    return filter_active_interfaces(interface_set).prefetch_related('ipv6list')


def all_active_interfaces(full=False):
    """Renvoie l'ensemble des machines autorisées à sortir sur internet """
    if full:
        return filter_complete_interfaces(Interface.objects)
    else:
        return filter_active_interfaces(Interface.objects)


def all_active_assigned_interfaces(full=False):
    """ Renvoie l'ensemble des machines qui ont une ipv4 assignées et
    disposant de l'accès internet"""
    return all_active_interfaces(full=full).filter(ipv4__isnull=False)


def all_active_interfaces_count():
    """ Version light seulement pour compter"""
    return Interface.objects.filter(
        machine__in=Machine.objects.filter(
            user__in=all_has_access()
        ).filter(active=True)
    )


def all_active_assigned_interfaces_count():
    """ Version light seulement pour compter"""
    return all_active_interfaces_count().filter(ipv4__isnull=False)


class SortTable:
    """ Class gathering uselful stuff to sort the colums of a table, according
    to the column and order requested. It's used with a dict of possible
    values and associated model_fields """

    # All the possible possible values
    # The naming convention is based on the URL or the views function
    # The syntax to describe the sort to apply is a dict where the keys are
    # the url value and the values are a list of model field name to use to
    # order the request. They are applied in the order they are given.
    # A 'default' might be provided to specify what to do if the requested col
    # doesn't match any keys.

    USERS_INDEX = {
        'user_name': ['name'],
        'user_surname': ['surname'],
        'user_pseudo': ['pseudo'],
        'user_room': ['room'],
        'default': ['state', 'pseudo']
    }
    USERS_INDEX_BAN = {
        'ban_user': ['user__pseudo'],
        'ban_start': ['date_start'],
        'ban_end': ['date_end'],
        'default': ['-date_end']
    }
    USERS_INDEX_WHITE = {
        'white_user': ['user__pseudo'],
        'white_start': ['date_start'],
        'white_end': ['date_end'],
        'default': ['-date_end']
    }
    USERS_INDEX_SCHOOL = {
        'school_name': ['name'],
        'default': ['name']
    }
    MACHINES_INDEX = {
        'machine_name': ['name'],
        'default': ['pk']
    }
    COTISATIONS_INDEX = {
        'cotis_user': ['user__pseudo'],
        'cotis_paiement': ['paiement__moyen'],
        'cotis_date': ['date'],
        'cotis_id': ['id'],
        'default': ['-date']
    }
    COTISATIONS_CONTROL = {
        'control_name': ['user__adherent__name'],
        'control_surname': ['user__surname'],
        'control_paiement': ['paiement'],
        'control_date': ['date'],
        'control_valid': ['valid'],
        'control_control': ['control'],
        'control_id': ['id'],
        'control_user-id': ['user__id'],
        'default': ['-date']
    }
    TOPOLOGIE_INDEX = {
        'switch_dns': ['interface__domain__name'],
        'switch_ip': ['interface__ipv4__ipv4'],
        'switch_loc': ['switchbay__name'],
        'switch_ports': ['number'],
        'switch_stack': ['stack__name'],
        'default': ['switchbay', 'stack', 'stack_member_id']
    }
    TOPOLOGIE_INDEX_PORT = {
        'port_port': ['port'],
        'port_room': ['room__name'],
        'port_interface': ['machine_interface__domain__name'],
        'port_related': ['related__switch__name'],
        'port_radius': ['radius'],
        'port_vlan': ['vlan_force__name'],
        'default': ['port']
    }
    TOPOLOGIE_INDEX_ROOM = {
        'room_name': ['name'],
        'default': ['name']
    }
    TOPOLOGIE_INDEX_BUILDING = {
        'building_name': ['name'],
        'default': ['name']
    }
    TOPOLOGIE_INDEX_BORNE = {
        'ap_name': ['interface__domain__name'],
        'ap_ip': ['interface__ipv4__ipv4'],
        'ap_mac': ['interface__mac_address'],
        'default': ['interface__domain__name']
    }
    TOPOLOGIE_INDEX_STACK = {
        'stack_name': ['name'],
        'stack_id': ['stack_id'],
        'default': ['stack_id'],
    }
    TOPOLOGIE_INDEX_MODEL_SWITCH = {
        'model-switch_name': ['reference'],
        'model-switch_contructor': ['constructor__name'],
        'default': ['reference'],
    }
    TOPOLOGIE_INDEX_SWITCH_BAY = {
        'switch-bay_name': ['name'],
        'switch-bay_building': ['building__name'],
        'default': ['name'],
    }
    TOPOLOGIE_INDEX_CONSTRUCTOR_SWITCH = {
        'constructor-switch_name': ['name'],
        'default': ['name'],
    }
    LOGS_INDEX = {
        'sum_date': ['revision__date_created'],
        'default': ['-revision__date_created'],
    }
    LOGS_STATS_LOGS = {
        'logs_author': ['user__name'],
        'logs_date': ['date_created'],
        'default': ['-date_created']
    }

    @staticmethod
    def sort(request, col, order, values):
        """ Check if the given values are possible and add .order_by() and
        a .reverse() as specified according to those values """
        fields = values.get(col, None)
        if not fields:
            fields = values.get('default', [])
        request = request.order_by(*fields)
        if values.get(col, None) and order == 'desc':
            return request.reverse()
        else:
            return request


def re2o_paginator(request, query_set, pagination_number):
    """Paginator script for list display in re2o.
    :request:
    :query_set: Query_set to paginate
    :pagination_number: Number of entries to display"""
    paginator = Paginator(query_set, pagination_number)
    page = request.GET.get('page')
    try:
        results = paginator.page(page)
    except PageNotAnInteger:
        # If page is not an integer, deliver first page.
        results = paginator.page(1)
    except EmptyPage:
        # If page is out of range (e.g. 9999), deliver last page of results.
        results = paginator.page(paginator.num_pages)
    return results


def remove_user_room(room):
    """ Déménage de force l'ancien locataire de la chambre """
    try:
        user = Adherent.objects.get(room=room)
    except Adherent.DoesNotExist:
        return
    user.room = None
    user.save()


def get_input_formats_help_text(input_formats):
    """Returns a help text about the possible input formats"""
    if len(input_formats) > 1:
        help_text_template="Format: {main} {more}"
    else:
        help_text_template="Format: {main}"
    more_text_template="<i class=\"fa fa-question-circle\" title=\"{}\"></i>"
    help_text = help_text_template.format(
        main=convert_datetime_format(input_formats[0]),
        more=more_text_template.format(
            '\n'.join(map(convert_datetime_format, input_formats))
        )
    )
    return help_text