from django.contrib.auth.models import AbstractUser
from django.db import models
from django.utils.translation import gettext_lazy as _

class User(AbstractUser):
    watchlist = models.ManyToManyField('Listing', related_name="user_wishlist", blank=True)

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

class Listing(models.Model):

    class Categories(models.TextChoices):
        APPLI = "Appliances", _("Appliances")
        CLOTH = "Clothes", _("Clothes")
        ELECT = "Electronics", _("Electronics")
        FURNI = "Furniture", _("Furniture")
        OTHER = "Other", _("Other")
        OUTDO = "Outdoors", _("Outdoors")
        SHOES = "Shoes", _("Shoes")
        TOYS = "Toys", _("Toys")

    user = models.ForeignKey(User, on_delete=models.CASCADE, related_name='user_listing')
    title = models.CharField(max_length=100, editable=True)
    description = models.TextField(editable=True)
    start_bid = models.DecimalField(max_digits=6, decimal_places=2, editable=True)
    image = models.URLField()
    category = models.CharField(max_length=20, choices=Categories.choices, default=Categories.OTHER)
    active = models.BooleanField(default=True)
    max_bid = models.ForeignKey('Bid', on_delete=models.PROTECT, blank=True, null=True, editable=True)

    def __str__(self):
        return f"{self.title} ({self.description}) :  ${self.start_bid}"

class Bid(models.Model):
    user = models.ForeignKey(User, on_delete=models.CASCADE, related_name='user_bidding')
    listing_item = models.ForeignKey(Listing, on_delete=models.CASCADE, related_name='auc_listing')
    bid = models.DecimalField(max_digits=6, decimal_places=2)

    def __str__(self):
        return f"{self.user} bid ${self.bid} on {self.listing_item}"
    
    def save(self, *args, **kwargs):
        check_bid = self.listing_item.max_bid
        if self.bid < self.listing_item.start_bid:
            raise ValueError("Bid is too low.")      
        elif check_bid is not None and self.bid <= check_bid.bid:
            raise ValueError("Bid is too low.") 
        
        super().save(*args, **kwargs)
        self.listing_item.max_bid = self
        self.listing_item.save()    
        
class Comment(models.Model):
    user = models.ForeignKey(User, on_delete=models.CASCADE, related_name='user_commenting')
    listing_item = models.ForeignKey(Listing, on_delete=models.CASCADE, related_name='where')
    comment = models.TextField(editable=True)

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