from django.db import models
from django.forms import ModelForm, Form
from django import forms
import re

from django.utils import timezone
from django.contrib.auth.models import AbstractBaseUser, BaseUserManager

from topologie.models import Room


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


def linux_user_check(login):
    """ Validation du pseudo pour respecter les contraintes unix"""
    UNIX_LOGIN_PATTERN = re.compile("^[a-z_][a-z0-9_-]*[$]?$")
    return UNIX_LOGIN_PATTERN.match(login)


def linux_user_validator(login):
    if not linux_user_check(login):
        raise forms.ValidationError(
                ", ce pseudo ('%(label)s') contient des carractères interdits",
                params={'label': login},
        )


def get_admin_right():
    try:
        admin_right = ListRight.objects.get(listright="admin")
    except ListRight.DoesNotExist:
        admin_right = ListRight(listright="admin")
        admin_right.save()
    return admin_right


class UserManager(BaseUserManager):
    def _create_user(self, pseudo, name, surname, email, password=None, su=False):
        if not pseudo:
            raise ValueError('Users must have an username')

        if not linux_user_check(pseudo):
            raise ValueError('Username shall only contain [a-z0-9_-]')

        user = self.model(
            pseudo=pseudo,
            name=name,
            surname=surname,
            email=self.normalize_email(email),
        )

        user.set_password(password)
        user.save(using=self._db)
        if su:
            user.make_admin()
        return user

    def create_user(self, pseudo, name, surname, email, password=None):
        """
        Creates and saves a User with the given pseudo, name, surname, email,
        and password.
        """
        return self._create_user(pseudo, name, surname, email, password, False)

    def create_superuser(self, pseudo, name, surname, email, password):
        """
        Creates and saves a superuser with the given pseudo, name, surname,
        email, and password.
        """
        return self._create_user(pseudo, name, surname, email, password, True)


class User(AbstractBaseUser):
    STATE_ACTIVE = 0
    STATE_DEACTIVATED = 1
    STATE_ARCHIVED = 2
    STATES = (
            (0, 'STATE_ACTIVE'),
            (1, 'STATE_DEACTIVATED'),
            (2, 'STATE_ARCHIVED'),
            )

    name = models.CharField(max_length=255)
    surname = models.CharField(max_length=255)
    pseudo = models.CharField(max_length=32, unique=True, help_text="Doit contenir uniquement des lettres, chiffres, ou tirets", validators=[linux_user_validator])
    email = models.EmailField()
    school = models.ForeignKey('School', on_delete=models.PROTECT, null=False, blank=False)
    comment = models.CharField(help_text="Commentaire, promo", max_length=255, blank=True)
    room = models.OneToOneField('topologie.Room', on_delete=models.PROTECT, blank=True, null=True)
    pwd_ntlm = models.CharField(max_length=255)
    state = models.IntegerField(choices=STATES, default=STATE_ACTIVE)
    registered = models.DateTimeField(auto_now_add=True)

    USERNAME_FIELD = 'pseudo'
    REQUIRED_FIELDS = ['name', 'surname', 'email']

    objects = UserManager()

    @property
    def is_active(self):
        return self.state == self.STATE_ACTIVE

    @property
    def is_staff(self):
        return self.is_admin

    @property
    def is_admin(self):
        try:
            Right.objects.get(user=self, right__listright='admin')
        except Right.DoesNotExist:
            return False
        return True

    @is_admin.setter
    def is_admin(self, value):
        if value and not self.is_admin:
            self.make_admin()
        elif not value and self.is_admin:
            self.un_admin()

    def get_full_name(self):
        return '%s %s' % (self.name, self.surname)

    def get_short_name(self):
        return self.name

    def has_perm(self, perm, obj=None):
        # Simplest version
        return True

    def has_module_perms(self, app_label):
        # Simplest version again
        return True

    def make_admin(self):
        """ Make User admin """
        user_admin_right = Right(user=self, right=get_admin_right())
        user_admin_right.save()

    def un_admin(self):
        try:
            user_right = Right.objects.get(user=self,right=get_admin_right())
        except Right.DoesNotExist:
            return
        user_right.delete()

    def __str__(self):
        return self.pseudo


class Right(models.Model):
    user = models.ForeignKey('User', on_delete=models.PROTECT)
    right = models.ForeignKey('ListRight', on_delete=models.PROTECT)

    class Meta:
        unique_together = ("user", "right")

    def __str__(self):
        return str(self.user) + " - " + str(self.right)


class School(models.Model):
    name = models.CharField(max_length=255)

    def __str__(self):
        return self.name


class ListRight(models.Model):
    listright = models.CharField(max_length=255, unique=True)

    def __str__(self):
        return self.listright


class Ban(models.Model):
    user = models.ForeignKey('User', on_delete=models.PROTECT)
    raison = models.CharField(max_length=255)
    date_start = models.DateTimeField(auto_now_add=True)
    date_end = models.DateTimeField(help_text='%d/%m/%y %H:%M:%S')

    def __str__(self):
        return str(self.user) + ' ' + str(self.raison)


class Whitelist(models.Model):
    user = models.ForeignKey('User', on_delete=models.PROTECT)
    raison = models.CharField(max_length=255)
    date_start = models.DateTimeField(auto_now_add=True)
    date_end = models.DateTimeField(help_text='%d/%m/%y %H:%M:%S')

    def __str__(self):
        return str(self.user) + ' ' + str(self.raison)


class InfoForm(ModelForm):
    force = forms.BooleanField(label="Forcer le déménagement ?", initial=False, required=False)

    def __init__(self, *args, **kwargs):
        super(InfoForm, self).__init__(*args, **kwargs)
        self.fields['name'].label = 'Nom'
        self.fields['surname'].label = 'Prénom'
        self.fields['school'].label = 'Établissement'
        self.fields['comment'].label = 'Commentaire'
        self.fields['room'].label = 'Chambre'
        self.fields['room'].empty_label = "Pas de chambre"
        self.fields['school'].empty_label = "Séléctionner un établissement"

    def clean_force(self):
        if self.cleaned_data.get('force', False):
            remove_user_room(self.cleaned_data.get('room'))
        return

    class Meta:
        model = User
        fields = [
            'name',
            'surname',
            'pseudo',
            'email',
            'school',
            'comment',
            'room',
        ]


class UserForm(InfoForm):
    class Meta(InfoForm.Meta):
        fields = '__all__'


class PasswordForm(ModelForm):
    class Meta:
        model = User
        fields = ['password', 'pwd_ntlm']


class StateForm(ModelForm):
    class Meta:
        model = User
        fields = ['state']


class SchoolForm(ModelForm):
    class Meta:
        model = School
        fields = ['name']

    def __init__(self, *args, **kwargs):
        super(SchoolForm, self).__init__(*args, **kwargs)
        self.fields['name'].label = 'Établissement à ajouter'


class DelSchoolForm(ModelForm):
    schools = forms.ModelMultipleChoiceField(queryset=School.objects.all(), label="Etablissements actuels",  widget=forms.CheckboxSelectMultiple)

    class Meta:
        exclude = ['name']
        model = School


class RightForm(ModelForm):
    def __init__(self, *args, **kwargs):
        super(RightForm, self).__init__(*args, **kwargs)
        self.fields['right'].label = 'Droit'
        self.fields['right'].empty_label = "Choisir un nouveau droit"

    class Meta:
        model = Right
        fields = ['right']


class DelRightForm(ModelForm):
    rights = forms.ModelMultipleChoiceField(queryset=Right.objects.all(), label="Droits actuels",  widget=forms.CheckboxSelectMultiple)

    class Meta:
        model = Right
        exclude = ['user', 'right']


class BanForm(ModelForm):
    def __init__(self, *args, **kwargs):
        super(BanForm, self).__init__(*args, **kwargs)
        self.fields['date_end'].label = 'Date de fin'

    class Meta:
        model = Ban
        exclude = ['user']

    def clean_date_end(self):
        date_end = self.cleaned_data['date_end']
        if date_end < timezone.now():
            raise forms.ValidationError("Triple buse, la date de fin ne peut pas être avant maintenant... Re2o ne voyage pas dans le temps")
        return date_end


class WhitelistForm(ModelForm):
    def __init__(self, *args, **kwargs):
        super(WhitelistForm, self).__init__(*args, **kwargs)
        self.fields['date_end'].label = 'Date de fin'

    class Meta:
        model = Whitelist
        exclude = ['user']

    def clean_date_end(self):
        date_end = self.cleaned_data['date_end']
        if date_end < timezone.now():
            raise forms.ValidationError("Triple buse, la date de fin ne peut pas être avant maintenant... Re2o ne voyage pas dans le temps")
        return date_end


class ProfilForm(Form):
    user = forms.CharField(label='Ok', max_length=100)