from django.contrib.gis.db import models
from django.utils import timezone
from django.contrib.gis.db.models.functions import Distance
from django.dispatch import receiver
from django.db.models.signals import post_save

from clients.models import ClientProfile
from partners.models import Establishment, RoomCategory

from dbsettings.functions import getValue

from datetime import timedelta

import uuid

class LengthChoices(models.IntegerChoices):
    ANY = 0
    SHORT = 1
    LONG = 2

class Inquiry(models.Model):
    uuid = models.UUIDField(default=uuid.uuid4, unique=True)
    client = models.ForeignKey(ClientProfile, models.PROTECT, null=True, blank=True)
    destination_name = models.CharField(max_length=128)
    destination_coords = models.PointField()
    destination_radius = models.IntegerField()
    arrival = models.DateField()
    min_nights = models.IntegerField(default=0, choices=LengthChoices.choices)
    budget = models.DecimalField(max_digits=10, decimal_places=2)
    adults = models.IntegerField()
    children = models.IntegerField()
    comment = models.TextField(null=True, blank=True)
    activated = models.DateTimeField(null=True, blank=True)
    bidding_end = models.DateTimeField(null=True, blank=True)
    auction_end = models.DateTimeField(null=True, blank=True)
    expiry = models.DateTimeField(null=True, blank=True)
    gateway = models.CharField(max_length=128, null=True, blank=True)

    @property
    def is_paid(self):
        if not self.invoice:
            return False

        return self.invoice.is_paid

    def activate(self):
        if self.activated:
            return False

        self.activated = timezone.now()
        self.bidding_end = self.activated + timedelta(hours=int(getValue("auction.bidding_period", 24)))
        self.auction_end = self.bidding_end + timedelta(hours=int(getValue("auction.selection_period", 24)))
        self.save()

    def process_payment(self):
        if self.invoice.is_paid:
            self.activate()

    @property
    def expired(self):
        return self.expiry and (self.expiry < timezone.now())

    @property
    def in_bidding(self):
        return self.active and (self.bidding_end > timezone.now())

    @property
    def in_selection(self):
        return self.active and (self.auction_end > timezone.now()) and not self.in_bidding

    @property
    def active(self):
        try:
            return bool(self.activated) and not self.expired
        except:
            return False

    @property
    def accepted(self):
        try:
            return Offer.objects.get(inquiry=self, accepted__isnull=False)
        except Offer.DoesNotExist:
            return False

class Offer(models.Model):
    uuid = models.UUIDField(default=uuid.uuid4, unique=True)
    inquiry = models.ForeignKey(Inquiry, models.PROTECT)
    roomcategory = models.ForeignKey(RoomCategory, models.PROTECT)
    departure = models.DateField()
    comment = models.TextField(null=True, blank=True)
    accepted = models.DateTimeField(null=True, blank=True)
    hidden = models.BooleanField(default=False)

    @property
    def establishment(self):
        return self.roomcategory.establishment

    @property
    def nights(self):
        return (self.departure - self.inquiry.arrival).days

    @property
    def distance(self):
        return self.inquiry.destination_coords.distance(self.roomcategory.establishment.coords)

@receiver(post_save, sender=Inquiry)
def inquiry_expiry(sender, instance, created, **kwargs):
    if not instance.expiry:
        instance.expiry = min(instance.arrival, (timezone.now() + timedelta(hours=int(getValue("auction.payment_period", 168)))).date())
        instance.save()