import uuid

import requests
from django.contrib.auth import get_user_model
from django.db import models

# Create your models here.
from django.db.models import Q
from django.db.models.signals import post_save, pre_save
from django.dispatch import receiver
from django.utils import timezone
from solo.models import SingletonModel
from django.utils.translation import ugettext_lazy as _
from stdimage import StdImageField
from stdimage.validators import MaxSizeValidator
from django.db import connection

from PaiementStripe.models import Paiement_stripe
from QrcodeCashless.models import CarteCashless
from TiBillet import settings
import stripe

import logging

logger = logging.getLogger(__name__)


class OptionGenerale(models.Model):
    uuid = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False, unique=True, db_index=True)
    name = models.CharField(max_length=30)
    poids = models.PositiveSmallIntegerField(default=0, verbose_name=_("Poids"))

    def __str__(self):
        return self.name

    class Meta:
        ordering = ('poids',)
        verbose_name = _('Options Generales')
        verbose_name_plural = _('Options Generales')


@receiver(post_save, sender=OptionGenerale)
def poids_option_generale(sender, instance: OptionGenerale, created, **kwargs):
    if created:
        # poids d'apparition
        if instance.poids == 0:
            instance.poids = len(OptionGenerale.objects.all()) + 1

        instance.save()


class Configuration(SingletonModel):
    organisation = models.CharField(max_length=50, verbose_name=_("Nom de l'organisation"))
    short_description = models.CharField(max_length=250, verbose_name=_("Description courte"))

    adress = models.CharField(max_length=250)
    phone = models.CharField(max_length=20)
    email = models.EmailField()

    site_web = models.URLField(blank=True, null=True)

    twitter = models.URLField(blank=True, null=True)
    facebook = models.URLField(blank=True, null=True)
    instagram = models.URLField(blank=True, null=True)

    adhesion_obligatoire = models.BooleanField(default=False)

    name_required_for_ticket = models.BooleanField(default=False, verbose_name=_("Billet nominatifs"))

    carte_restaurant = StdImageField(upload_to='images/',
                                     null=True, blank=True,
                                     validators=[MaxSizeValidator(1920, 1920)],
                                     variations={
                                         'fhd': (1920, 1920),
                                         'hdr': (720, 720),
                                         'med': (480, 480),
                                         'thumbnail': (150, 90),
                                     },
                                     delete_orphans=True,
                                     verbose_name=_('Carte du restaurant')
                                     )

    img = StdImageField(upload_to='images/',
                        null=True, blank=True,
                        # validators=[MaxSizeValidator(1920, 1920)],
                        variations={
                            'fhd': (1920, 1920),
                            'hdr': (720, 720),
                            'med': (480, 480),
                            'thumbnail': (150, 90),
                        },
                        delete_orphans=True,
                        verbose_name='Background'
                        )

    mollie_api_key = models.CharField(max_length=50,
                                      blank=True, null=True)

    stripe_api_key = models.CharField(max_length=110, blank=True, null=True)
    stripe_test_api_key = models.CharField(max_length=110, blank=True, null=True)
    stripe_mode_test = models.BooleanField(default=True)

    activer_billetterie = models.BooleanField(default=True, verbose_name=_("Activer la billetterie"))

    jauge_max = models.PositiveSmallIntegerField(default=50, verbose_name=_("Jauge maximale"))

    option_generale_radio = models.ManyToManyField(OptionGenerale,
                                                   blank=True,
                                                   related_name="radiobutton")

    option_generale_checkbox = models.ManyToManyField(OptionGenerale,
                                                      blank=True,
                                                      related_name="checkbox")

    server_cashless = models.URLField(
        max_length=300,
        blank=True,
        null=True,
        verbose_name=_("Adresse du serveur Cashless")
    )

    key_cashless = models.CharField(
        max_length=41,
        blank=True,
        null=True,
        verbose_name=_("Clé d'API du serveur cashless")
    )


class Product(models.Model):
    uuid = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False, unique=True, db_index=True)

    name = models.CharField(max_length=50)

    publish = models.BooleanField(default=False)

    img = StdImageField(upload_to='images/',
                        null=True, blank=True,
                        validators=[MaxSizeValidator(1920, 1920)],
                        variations={
                            'fhd': (1920, 1920),
                            'hdr': (720, 720),
                            'med': (480, 480),
                            'thumbnail': (150, 90),
                        },
                        delete_orphans=True,
                        verbose_name='Image'
                        )

    BILLET, PACK, RECHARGE_CASHLESS, VETEMENT, MERCH, ADHESION = 'B', 'P', 'R', 'T', 'M', 'A'
    TYPE_CHOICES = [
        (BILLET, _('Billet')),
        (PACK, _("Pack d'objets")),
        (RECHARGE_CASHLESS, _('Recharge cashless')),
        (VETEMENT, _('Vetement')),
        (MERCH, _('Merchandasing')),
        (ADHESION, ('Adhésion')),
    ]

    categorie_article = models.CharField(max_length=3, choices=TYPE_CHOICES, default=BILLET,
                                         verbose_name=_("Type d'article"))

    id_product_stripe = models.CharField(max_length=30, null=True, blank=True)

    def __str__(self):
        return f"{self.name}"

    def get_id_product_stripe(self):
        configuration = Configuration.get_solo()
        if configuration.stripe_api_key and not self.id_product_stripe:
            if configuration.stripe_mode_test:
                stripe.api_key = configuration.stripe_test_api_key
            else:
                stripe.api_key = configuration.stripe_api_key

            if self.img:
                # noinspection PyUnresolvedReferences
                domain_url = connection.tenant.domains.all()[0].domain
                # noinspection PyUnresolvedReferences
                images = [f"https://{domain_url}{self.img.med.url}", ]
            else:
                images = []

            product = stripe.Product.create(
                name=f"{self.name}",
                images=images
            )
            self.id_product_stripe = product.id
            self.save()

            return self.id_product_stripe

        elif self.id_product_stripe:
            return self.id_product_stripe
        else:
            return False

    def reset_id_stripe(self):
        self.id_product_stripe = None
        self.save()


class Price(models.Model):
    uuid = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False, unique=True, db_index=True)

    product = models.ForeignKey(Product, on_delete=models.PROTECT, related_name="prices")

    name = models.CharField(max_length=50)
    prix = models.FloatField()

    NA, DIX, VINGT = 'NA', 'DX', 'VG'
    TVA_CHOICES = [
        (NA, _('Non applicable')),
        (DIX, _("10 %")),
        (VINGT, _('20 %')),
    ]

    vat = models.CharField(max_length=2,
                           choices=TVA_CHOICES,
                           default=NA,
                           verbose_name=_("Taux TVA"),
                           )

    id_price_stripe = models.CharField(max_length=30, null=True, blank=True)

    stock = models.SmallIntegerField(blank=True, null=True)
    max_per_user = models.PositiveSmallIntegerField(default=10)

    def range_max(self):
        return range(self.max_per_user + 1)

    def __str__(self):
        return f"{self.product.name} {self.name}"

    def get_id_price_stripe(self):
        configuration = Configuration.get_solo()
        if configuration.stripe_api_key and not self.id_price_stripe:
            if configuration.stripe_mode_test:
                stripe.api_key = configuration.stripe_test_api_key
            else:
                stripe.api_key = configuration.stripe_api_key

            price = stripe.Price.create(
                unit_amount=int("{0:.2f}".format(self.prix).replace('.', '')),
                currency="eur",
                product=self.product.get_id_product_stripe(),
                nickname=self.name,
            )

            self.id_price_stripe = price.id
            self.save()
            return self.id_price_stripe

        elif self.id_price_stripe:
            return self.id_price_stripe
        else:
            return False

    def reset_id_stripe(self):
        self.id_price_stripe = None
        self.save()


class Event(models.Model):
    uuid = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False, unique=True, db_index=True)

    name = models.CharField(max_length=200)
    datetime = models.DateTimeField()

    short_description = models.CharField(max_length=250)
    long_description = models.TextField(blank=True, null=True)

    products = models.ManyToManyField(Product, blank=True)

    img = StdImageField(upload_to='images/',
                        validators=[MaxSizeValidator(1920, 1920)],
                        variations={
                            'fhd': (1920, 1920),
                            'hdr': (1280, 1280),
                            'crop': (510, 310, True),
                        },
                        delete_orphans=True
                        )

    reservations = models.PositiveSmallIntegerField(default=0)

    CONCERT = "LIV"
    FESTIVAL = "FES"
    REUNION = "REU"
    CONFERENCE = "CON"
    TYPE_CHOICES = [
        (CONCERT, _('Concert')),
        (FESTIVAL, _('Festival')),
        (REUNION, _('Réunion')),
        (CONFERENCE, _('Conférence')),
    ]

    categorie = models.CharField(max_length=3, choices=TYPE_CHOICES, default=CONCERT,
                                 verbose_name=_("Catégorie d'évènement"))

    def complet(self):
        # TODO: Benchmarker et tester si c'est pas mieux dans template
        if self.reservations >= Configuration.get_solo().jauge_max:
            return True
        else:
            return False

    def __str__(self):
        return f"{self.datetime.strftime('%d/%m')} {self.name}"

    class Meta:
        ordering = ('datetime',)
        verbose_name = _('Evenement')
        verbose_name_plural = _('Evenements')


class Reservation(models.Model):
    uuid = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False, unique=True, db_index=True)
    datetime = models.DateTimeField(auto_now=True)

    user_commande = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.PROTECT)

    event = models.ForeignKey(Event,
                              on_delete=models.PROTECT,
                              related_name="reservation")

    CANCELED, UNPAID, PAID, VALID, = 'C', 'N', 'P', 'V'
    TYPE_CHOICES = [
        (CANCELED, _('Annulée')),
        (UNPAID, _('Non payée')),
        (PAID, _('Payée')),
        (VALID, _('Validée')),
    ]

    status = models.CharField(max_length=3, choices=TYPE_CHOICES, default=UNPAID,
                              verbose_name=_("Status de la réservation"))

    paiement = models.OneToOneField(Paiement_stripe, on_delete=models.PROTECT, blank=True, null=True,
                                    related_name='reservation')

    options = models.ManyToManyField(OptionGenerale, blank=True)

    class Meta:
        ordering = ('-datetime',)

    def user_mail(self):
        return self.user_commande.email

    def __str__(self):
        return f"{str(self.uuid).partition('-')[0]} - {self.user_commande.email}"
    # def total_billet(self):
    #     total = 0
    #     for ligne in self.paiements.all():
    #         if ligne.billet:
    #             total += ligne.qty
    #     return total
    #
    # def total_prix(self):
    #     total = 0
    #     for ligne in self.paiements.all():
    #         if ligne.product:
    #             total += ligne.qty * ligne.product.prix
    #
    #     return total
    #
    # def _options_(self):
    #     return " - ".join([f"{option.name}" for option in self.options.all()])
    #


@receiver(post_save, sender=Reservation)
def trigger_reservation(sender, instance: Reservation, created, **kwargs):
    if instance.status == Reservation.PAID:
        if instance.tickets:
            for ticket in instance.tickets.filter(status=Ticket.NOT_ACTIV):
                logger.info(f'trigger_reservation, activation des tickets {ticket} NOT_SCANNED')
                ticket.status = Ticket.NOT_SCANNED
                ticket.save()


class Ticket(models.Model):
    uuid = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False, unique=True, db_index=True)

    first_name = models.CharField(max_length=200)
    last_name = models.CharField(max_length=200)

    reservation = models.ForeignKey(Reservation, on_delete=models.CASCADE, related_name="tickets")

    NOT_ACTIV, NOT_SCANNED, SCANNED = 'N', 'K', 'S'
    SCAN_CHOICES = [
        (NOT_ACTIV, _('Non actif')),
        (NOT_SCANNED, _('Non scanné')),
        (SCANNED, _('scanné')),
    ]

    status = models.CharField(max_length=1, choices=SCAN_CHOICES, default=NOT_ACTIV,
                              verbose_name=_("Status du scan"))

    def event(self):
        return self.reservation.event

    event.allow_tags = True
    event.short_description = 'Évènement'
    event.admin_order_field = 'reservation__event'

    def datetime(self):
        return self.reservation.datetime

    datetime.allow_tags = True
    datetime.short_description = 'Date de reservation'
    datetime.admin_order_field = 'reservation__datetime'

    class meta:
        ordering = ('-datetime',)


class LigneArticle(models.Model):
    uuid = models.UUIDField(primary_key=True, db_index=True, default=uuid.uuid4)
    datetime = models.DateTimeField(auto_now=True)

    price = models.ForeignKey(Price, on_delete=models.CASCADE)

    qty = models.SmallIntegerField()

    carte = models.ForeignKey(CarteCashless, on_delete=models.PROTECT, blank=True, null=True)

    paiement_stripe = models.ForeignKey(Paiement_stripe, on_delete=models.PROTECT, blank=True, null=True)

    CANCELED, UNPAID, PAID, VALID, = 'C', 'N', 'P', 'V'
    TYPE_CHOICES = [
        (CANCELED, _('Annulée')),
        (UNPAID, _('Non payée')),
        (PAID, _('Payée')),
        (VALID, _('Validée par serveur cashless')),
    ]

    status = models.CharField(max_length=3, choices=TYPE_CHOICES, default=UNPAID,
                              verbose_name=_("Status de ligne article"))

    class Meta:
        ordering = ('-datetime',)

    def status_stripe(self):
        if self.paiement_stripe:
            return self.paiement_stripe.status
        else:
            return _('no stripe send')


@receiver(pre_save, sender=LigneArticle)
def trigger_LigneArticle(sender, instance: LigneArticle, update_fields=None, **kwargs):
    # if not created
    if not instance._state.adding:
        old_instance = sender.objects.get(pk=instance.pk)
        new_instance = pre_save_signal_status(old_instance, instance)


@receiver(pre_save, sender=Paiement_stripe)
def trigger_paiement_stripe(sender, instance: Paiement_stripe, update_fields=None, **kwargs):
    # if not create
    if not instance._state.adding:
        old_instance = sender.objects.get(pk=instance.pk)
        new_instance = pre_save_signal_status(old_instance, instance)


########################################################################
######################## SIGNAL PRE & POST SAVE ########################
########################################################################


######################## TRIGGER LIGNE ARTICLE ########################

# post_save ici nécéssaire pour mettre a jour le status du paiement stripe en validé
# si toutes les lignes articles sont VALID.
@receiver(post_save, sender=LigneArticle)
def set_paiement_and_reservation_valid(sender, instance: LigneArticle, **kwargs):
    if instance.status == LigneArticle.VALID:
        lignes_dans_paiement_stripe = instance.paiement_stripe.lignearticle_set.all()
        if len(lignes_dans_paiement_stripe) == len(lignes_dans_paiement_stripe.filter(status=LigneArticle.VALID)):
            # on passe le status du paiement stripe en VALID
            logger.info(f"    TRIGGER LIGNE ARTICLE set_paiement_and_reservation_valid {instance.price} "
                        f"paiement stripe {instance.paiement_stripe} {instance.paiement_stripe.status} à VALID")
            instance.paiement_stripe.status = Paiement_stripe.VALID
            instance.paiement_stripe.save()


def check_paid(old_instance, new_instance):
    # Type :
    old_instance: LigneArticle
    new_instance: LigneArticle
    logger.info(f"    TRIGGER LIGNE ARTICLE check_paid {old_instance.price}")

    if new_instance.price.product.categorie_article in \
            [Product.RECHARGE_CASHLESS, Product.ADHESION]:
        send_to_cashless(new_instance)


def send_to_cashless(instance):
    # Type :
    instance: LigneArticle

    logger.info(f"        send_to_cashless {instance.price}")
    data_for_cashless = {'uuid_commande': instance.paiement_stripe.uuid}
    data_for_cashless['uuid'] = instance.carte.uuid

    if instance.price.product.categorie_article == Product.RECHARGE_CASHLESS:
        data_for_cashless['recharge_qty'] = instance.price.prix

    if instance.price.product.categorie_article == Product.ADHESION:
        data_for_cashless['tarif_adhesion'] = instance.price.prix

    # si il y a des données a envoyer au serveur cashless :
    sess = requests.Session()
    configuration = Configuration.get_solo()
    r = sess.post(
        f'{configuration.server_cashless}/api/billetterie_endpoint',
        headers={
            'Authorization': f'Api-Key {configuration.key_cashless}'
        },
        data=data_for_cashless,
    )

    sess.close()
    logger.info(
        f"        demande au serveur cashless pour un rechargement. réponse : {r.status_code} ")

    if r.status_code == 200:
        instance.status = LigneArticle.VALID
    else:
        logger.error(
            f"erreur réponse serveur cashless {r.status_code} {r.text} pour paiement stripe {instance.price} uuid {instance.uuid}")


######################## TRIGGER PAIEMENT STRIPE ########################


def set_ligne_article_paid(old_instance, new_instance):
    # Type :
    old_instance: Paiement_stripe
    new_instance: Paiement_stripe

    logger.info(f"    TRIGGER PAIEMENT STRIPE set_ligne_article_paid {old_instance}.")
    logger.info(f"        On passe toutes les lignes d'article non validées en payées !")

    lignes_article = new_instance.lignearticle_set.exclude(status=LigneArticle.VALID)
    for ligne_article in lignes_article:
        logger.info(f"            {ligne_article.price} {ligne_article.status} to P]")
        ligne_article.status = LigneArticle.PAID
        ligne_article.save()

    # si ya une reservation, on la met aussi en payée :
    if new_instance.reservation:
        new_instance.reservation.status = Reservation.PAID
        new_instance.reservation.save()


def expire_paiement_stripe(old_instance, new_instance):
    logger.info(f"    TRIGGER PAIEMENT STRIPE expire_paiement_stripe {old_instance.status} to {new_instance.status}")
    pass


def valide_stripe_paiement(old_instance, new_instance):
    logger.info(f"    TRIGGER PAIEMENT STRIPE valide_stripe_paiement {old_instance.status} to {new_instance.status}")
    pass

######################## TRIGGER RESERVATION ########################


def send_billet_to_mail(old_instance, new_instance):
    logger.info(f"    TRIGGER RESERVATION send_billet_to_mail {old_instance.status} to {new_instance.status}")
    pass


######################## MOTEUR TRIGGER ########################

def error_regression(old_instance, new_instance):
    logger.info(f"models_trigger erreur_regression {old_instance.status} to {new_instance.status}")
    logger.error(f"######################## error_regression ########################")
    # raise Exception('Regression de status impossible.')
    pass


# def pass(old_instance, new_instance):

# On déclare les transitions possibles entre différents etats des statuts.
# Exemple première ligne : Si status passe de PENDING vers PAID, alors on lance set_ligne_article_paid
class Transitions():
    ''''''
    '''
        Reservation choices :
        (CANCELED, _('Annulée')),
        (UNPAID, _('Non payée')),
        (PAID, _('Payée')),
        (VALID, _('Validée')),
    '''
    RESERVATION = {
        Reservation.UNPAID: {
            Reservation.PAID : send_billet_to_mail
        },
        Reservation.PAID: {
            LigneArticle.PAID: send_billet_to_mail,
           '_else_': error_regression,
        },
        Reservation.VALID: {
            '_all_': error_regression,
        }
    }
    '''
        Paiement_stripe choices :
        (NON, 'Lien de paiement non créé'),
        (OPEN, 'Envoyée a Stripe'),
        (PENDING, 'En attente de paiement'),
        (EXPIRE, 'Expiré'),
        (PAID, 'Payée'),
        (VALID, 'Payée et validée'),  # envoyé sur serveur cashless
        (CANCELED, 'Annulée'),
    '''
    PAIEMENT_STRIPE = {
        Paiement_stripe.PENDING: {
            Paiement_stripe.PAID: set_ligne_article_paid,
            Paiement_stripe.EXPIRE: expire_paiement_stripe,
            Paiement_stripe.CANCELED: expire_paiement_stripe,
        },
        Paiement_stripe.PAID: {
            Paiement_stripe.PAID: set_ligne_article_paid,
            Paiement_stripe.VALID: valide_stripe_paiement,
            '_else_': error_regression,
        },
        Paiement_stripe.VALID: {
            '_all_': error_regression,
        }
    }
    '''
        LigneArticle Choices :
        (CANCELED, _('Annulée')),
        (UNPAID, _('Non payée')),
        (PAID, _('Payée')),
        (VALID, _('Validée par serveur cashless')),
    '''
    LIGNEARTICLE = {
        LigneArticle.UNPAID: {
            LigneArticle.PAID: check_paid,
        },
        LigneArticle.PAID: {
            LigneArticle.PAID: check_paid,
            # LigneArticle.VALID: valide_stripe_paiement,
            '_else_': error_regression,
        },
        LigneArticle.VALID: {
            '_all_': error_regression,
        }
    }


def pre_save_signal_status(old_instance, new_instance):
    # import ipdb; ipdb.set_trace()
    sender_str = old_instance.__class__.__name__.upper()
    dict_transition = getattr(Transitions, f"{sender_str}", None)
    if dict_transition:
        logger.info(f"dict_transition {sender_str} {new_instance} : {old_instance.status} to {new_instance.status}")
        transitions = dict_transition.get(old_instance.status, None)
        if transitions:
            # Par ordre de préférence :
            trigger_function = transitions.get('_all_', (
                transitions.get(new_instance.status, (
                    transitions.get('_else_', None)
                ))))

            if trigger_function:
                # import ipdb; ipdb.set_trace()

                if not callable(trigger_function):
                    raise Exception(f'Fonction {trigger_function} is not callable. Disdonc !?')
                trigger_function(old_instance, new_instance)