# 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.

from django.db import models
from django.forms import ModelForm, Form
from django.contrib.contenttypes.models import ContentType
from django.contrib.contenttypes.fields import GenericForeignKey
from django.core.exceptions import ValidationError
import reversion

from machines.models import Vlan

def make_port_related(port):
    related_port = port.related
    related_port.related = port
    related_port.save()
    
def clean_port_related(port):
    related_port = port.related_port
    related_port.related = None
    related_port.save()

class Switch(models.Model):
    PRETTY_NAME = "Switch / Commutateur"

    switch_interface = models.OneToOneField('machines.Interface', on_delete=models.CASCADE)
    location = models.CharField(max_length=255)
    number = models.IntegerField()
    details = models.CharField(max_length=255, blank=True)

    def __str__(self):
        return str(self.location) + ' ' + str(self.switch_interface)

class Port(models.Model):
    PRETTY_NAME = "Port de switch"
    STATES_BASE = (
            ('NO', 'NO'),
            ('STRICT', 'STRICT'),
            ('BLOQ', 'BLOQ'),
            ('COMMON', 'COMMON'),
            )
    try:
        STATES = STATES_BASE + tuple([(str(id), str(id)) for id in list(Vlan.objects.values_list('vlan_id', flat=True).order_by('vlan_id'))])
    except:
        STATES = STATES_BASE 

    switch = models.ForeignKey('Switch', related_name="ports")
    port = models.IntegerField()
    room = models.ForeignKey('Room', on_delete=models.PROTECT, blank=True, null=True)
    machine_interface = models.ForeignKey('machines.Interface', on_delete=models.SET_NULL, blank=True, null=True)
    related = models.OneToOneField('self', null=True, blank=True, related_name='related_port')
    radius = models.CharField(max_length=32, choices=STATES, default='NO')
    details = models.CharField(max_length=255, blank=True)

    class Meta:
        unique_together = ('switch', 'port')

    def clean(self):
        if hasattr(self, 'switch'):
            if self.port > self.switch.number:
                raise ValidationError("Ce port ne peut exister, numero trop élevé")
        if self.room and self.machine_interface or self.room and self.related or self.machine_interface and self.related:
            raise ValidationError("Chambre, interface et related_port sont mutuellement exclusifs")
        if self.related==self:
            raise ValidationError("On ne peut relier un port à lui même")
        if self.related and not self.related.related:
            if self.related.machine_interface or self.related.room:
                raise ValidationError("Le port relié est déjà occupé, veuillez le libérer avant de créer une relation")
            else:
                make_port_related(self)
        elif hasattr(self, 'related_port'):
            clean_port_related(self)

    def __str__(self):
        return str(self.switch) + " - " + str(self.port)

class Room(models.Model):
    PRETTY_NAME = "Chambre/ Prise murale"

    name = models.CharField(max_length=255, unique=True)
    details = models.CharField(max_length=255, blank=True)

    def __str__(self):
        return str(self.name)