from django.db import models

from django.contrib.auth.models import User

class Tag(models.Model):
    name = models.CharField(max_length=30)
    color = models.CharField(max_length=30, default="#f2f2f2")
    created_at = models.DateField(auto_now_add=True)
    owner = models.ForeignKey(User, related_name="tags", on_delete=models.CASCADE, null=True)

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


class ShopTag(models.Model):
    name = models.CharField(max_length=30)
    color = models.CharField(max_length=30, default="#9e9e9e")
    created_at = models.DateField(auto_now_add=True)
    owner = models.ForeignKey(User, related_name="shop_tags", on_delete=models.CASCADE, null=True)

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


class Shop(models.Model):
    name = models.CharField(max_length=30)
    created_at = models.DateField(auto_now_add=True)
    tags = models.ManyToManyField(ShopTag, blank=True)
    owner = models.ForeignKey(User, related_name="shops", on_delete=models.CASCADE, null=True)

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


class Product(models.Model):
    name = models.CharField(max_length=30)
    created_at = models.DateField(auto_now_add=True)
    owner = models.ForeignKey(User, related_name="products", on_delete=models.CASCADE, null=True)
    default_tags = models.ManyToManyField(Tag, blank=True)

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


class Receipt(models.Model):
    shop = models.ForeignKey(Shop, related_name="receipts", on_delete=models.CASCADE, blank=True)
    created_at = models.DateField(auto_now_add=True)
    date = models.DateField(auto_now_add=False)
    owner = models.ForeignKey(User, related_name="receipts", on_delete=models.CASCADE, null=True)
    total_price = models.FloatField(default=float(0.00))

    def __str__(self):
        return f"{self.shop} | {self.total_price} zł | {self.owner.username}"
    

class ProductOnBill(models.Model):
    name = models.CharField(max_length=30)
    created_at = models.DateField(auto_now_add=True)
    price = models.DecimalField(max_digits=5, decimal_places=2)
    receipt = models.ForeignKey(Receipt, related_name="products", on_delete=models.CASCADE)
    tags = models.ManyToManyField(Tag, blank=True)
    owner = models.ForeignKey(User, related_name="products_on_bills", on_delete=models.CASCADE, null=True)

    def __str__(self):
        return f"{self.name} | {self.price} zł | {self.owner.username}"