from decimal import Decimal
from uuid import uuid4

from django.conf import settings
from django.contrib.auth import get_user_model
from django.db import models
from django.utils import timezone
from django.utils.text import gettext_lazy as _
from django.utils.text import slugify

User = get_user_model()


class TimestampedModel(models.Model):
    creation_date = models.DateTimeField(
        auto_now_add=True, verbose_name=_("fecha de creación")
    )
    last_modification_date = models.DateTimeField(
        auto_now=True, verbose_name=_("fecha de última modificación")
    )

    class Meta:
        abstract = True


class Tag(models.Model):
    name = models.CharField(max_length=16)

    def __str__(self):
        return self.name

    class Meta:
        verbose_name = _("etiqueta")
        verbose_name_plural = _("etiquetas")
        ordering = ("name",)


class Product(TimestampedModel):
    sku = models.CharField(
        max_length=64,
        blank=False,
        null=False,
        unique=True,
        verbose_name=_("código de referencia"),
    )
    name = models.CharField(
        max_length=96,
        blank=False,
        null=False,
        verbose_name=_("nombre"),
    )
    description = models.TextField(
        blank=True,
        default="",
        verbose_name=_("descripción"),
    )
    stock = models.DecimalField(
        max_digits=13,
        decimal_places=4,
        default=Decimal("0"),
        verbose_name=_("stock"),
    )
    is_digital_asset = models.BooleanField(
        default=False, verbose_name=_("es un activo digital")
    )
    url = models.URLField(blank=True, verbose_name=_("URL de descarga"))
    images = models.ManyToManyField(
        "files.FileUpload", blank=True, verbose_name=_("imágenes")
    )
    tags = models.ManyToManyField("shop.Tag", blank=True, verbose_name=_("etiquetas"))
    brand = models.ForeignKey(
        "shop.Brand",
        blank=True,
        null=True,
        on_delete=models.SET_NULL,
        verbose_name=_("marca"),
    )
    slug = models.SlugField(
        default="", blank=True, null=True, max_length=128, verbose_name=_("Slug")
    )
    hidden = models.BooleanField(default=False, db_index=True, verbose_name=_("oculto"))

    def __str__(self):
        return self.name

    def save(
        self,
        *args,
        **kwargs,
    ):
        if not self.pk:
            self.slug = slugify(self.name)[:128]
        super().save(*args, **kwargs)

    @property
    def price(self):
        return self.prices.filter(current=True).first()

    class Meta:
        verbose_name = _("producto")
        verbose_name_plural = _("productos")
        ordering = ("id",)


class ProductPrice(TimestampedModel):
    price = models.DecimalField(
        max_digits=11, decimal_places=2, verbose_name=_("precio")
    )
    date = models.DateTimeField(default=timezone.now, verbose_name=_("fecha"))
    product = models.ForeignKey(
        "shop.Product",
        on_delete=models.CASCADE,
        verbose_name=_("producto"),
        related_name="prices",
    )
    tax = models.ForeignKey(
        "shop.Tax",
        on_delete=models.PROTECT,
        verbose_name=_("impuesto aplicable"),
    )
    price_with_tax = models.DecimalField(
        max_digits=11,
        decimal_places=2,
        blank=True,
        null=True,
        verbose_name=_("precio con impuestos"),
    )
    current = models.BooleanField(default=False, verbose_name=_("es el precio actual"))

    def __str__(self):
        return f"{self.price} - {self.tax.code}"

    def save(self, *args, **kwargs):
        tax_value = self.price * Decimal(self.tax.value / 100)
        self.price_with_tax = round(self.price + tax_value, 2)
        super().save()

    class Meta:
        verbose_name = _("precio de producto")
        verbose_name_plural = _("precio de producto")
        ordering = ("-date",)


class ProductBatch(TimestampedModel):
    code = models.CharField(
        max_length=32, unique=True, db_index=True, verbose_name=_("código")
    )
    product = models.ForeignKey(
        "shop.Product", on_delete=models.PROTECT, verbose_name=_("producto")
    )
    quantity = models.DecimalField(
        max_digits=13,
        decimal_places=4,
        default=Decimal("1"),
        verbose_name=_("cantidad"),
    )
    expiration_date = models.DateField(
        blank=True, null=True, verbose_name=_("fecha de caducidad / consumo preferente")
    )
    provider = models.ForeignKey(
        "shop.Provider",
        on_delete=models.SET_NULL,
        blank=True,
        null=True,
        verbose_name=_("proveedor"),
    )

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

    class Meta:
        verbose_name = _("remesa de producto")
        verbose_name_plural = _("remesas de productos")


class Tax(TimestampedModel):
    code = models.CharField(
        max_length=8, blank=False, unique=True, verbose_name=_("código de impuesto")
    )
    value = models.PositiveIntegerField(
        null=False, blank=False, verbose_name=_("valor entero (porcentaje)")
    )

    def __str__(self):
        return f"{self.code} - {self.value}%"

    class Meta:
        verbose_name = _("impuesto")
        verbose_name_plural = _("impuestos")
        ordering = ("id",)


class Provider(TimestampedModel):
    vat_id = models.CharField(
        max_length=32,
        blank=False,
        unique=True,
        verbose_name=_("documento de identidad"),
    )
    name = models.CharField(max_length=64, blank=False, verbose_name=_("nombre"))

    email = models.EmailField(blank=False, verbose_name=_("e-mail de contacto"))
    phone = models.CharField(
        max_length=16,
        blank=True,
        null=True,
        default="",
        verbose_name=_("Teléfono de contacto"),
    )

    address = models.CharField(max_length=255, blank=False, verbose_name=_("dirección"))
    city = models.CharField(max_length=64, blank=False, verbose_name=_("ciudad"))
    state = models.CharField(max_length=64, blank=False, verbose_name=_("región"))
    country = models.CharField(max_length=64, blank=False, verbose_name=_("país"))
    zip = models.CharField(max_length=32, blank=False, verbose_name=_("código postal"))

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

    class Meta:
        verbose_name = _("proveedor")
        verbose_name_plural = _("proveedores")


class Brand(TimestampedModel):
    name = models.CharField(
        max_length=100, unique=True, blank=False, null=False, verbose_name=_("nombre")
    )

    class Meta:
        verbose_name = _("marca")
        verbose_name_plural = _("marcas")


class OrderLine(TimestampedModel):
    order = models.ForeignKey(
        "shop.Order",
        on_delete=models.CASCADE,
        related_name="lines",
        verbose_name=_("pedido"),
    )
    product = models.ForeignKey(
        "shop.Product",
        on_delete=models.CASCADE,
        null=False,
        blank=False,
        verbose_name=_("producto"),
    )
    quantity = models.DecimalField(
        max_digits=13,
        decimal_places=4,
        default=Decimal("1"),
        null=False,
        blank=False,
        verbose_name=_("cantidad"),
    )

    # Precio del producto en el momento en el que se crea el pedido
    price = models.DecimalField(
        max_digits=13, decimal_places=4, verbose_name=_("precio")
    )

    # base_total = quantity * price
    base_total = models.DecimalField(
        max_digits=13,
        decimal_places=4,
        default=Decimal("0"),
        null=False,
        blank=False,
        verbose_name=_("total sin impuestos"),
    )

    # Valor entero del impuesto en el momento en el que se crea el pedido
    tax_value = models.PositiveIntegerField(
        null=False, blank=False, verbose_name=_("valor de impuestos")
    )

    # taxes = price * quantity * (tax_value / 100)
    taxes = models.DecimalField(
        max_digits=13, decimal_places=4, verbose_name=_("impuestos")
    )

    # total = base_total + taxes
    total = models.DecimalField(
        max_digits=13, decimal_places=4, verbose_name=_("total")
    )

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

    class Meta:
        verbose_name = _("línea de pedido")
        verbose_name_plural = _("líneas de pedido")


class Order(TimestampedModel):
    class Statuses(models.TextChoices):
        STATUS_PENDING = "PEN", _("pendiente de pago")
        STATUS_PAID = "PAI", _("pagado")
        STATUS_READY = "RDY", _("preparado")
        STATUS_TO_BE_SENT = "TBS", _("listo para ser enviado")
        STATUS_SENT = "SNT", _("enviado")
        STATUS_DELIVERED = "DLV", _("entregado")
        STATUS_FINISHED = "FIN", _("finalizado")
        STATUS_CANCELED = "CAN", _("cancelado")
        STATUS_RETURNED = "RTN", _("devuelto")

    uuid = models.UUIDField(default=uuid4, verbose_name=_("UUID"), db_index=True)

    status = models.CharField(
        max_length=3, default=Statuses.STATUS_PENDING, verbose_name=_("estado")
    )

    base_total = models.DecimalField(
        default=Decimal("0"),
        max_digits=13,
        decimal_places=2,
        verbose_name=_("base imponible"),
    )
    total = models.DecimalField(
        default=Decimal("0"), max_digits=13, decimal_places=2, verbose_name=_("total")
    )

    user = models.ForeignKey(User, on_delete=models.PROTECT, verbose_name=_("cliente"))

    # Billing information
    billing_address = models.CharField(
        max_length=255, blank=False, verbose_name=_("dirección de facturación")
    )
    billing_city = models.CharField(
        max_length=64, blank=False, verbose_name=_("ciudad de facturación")
    )
    billing_state = models.CharField(
        max_length=64, blank=False, verbose_name=_("región de facturación")
    )
    billing_country = models.CharField(
        max_length=64, blank=False, verbose_name=_("país de facturación")
    )
    billing_zip = models.CharField(
        max_length=32, blank=False, verbose_name=_("código postal de facturación")
    )

    # Shipping information
    shipping_address = models.CharField(
        max_length=255, blank=False, verbose_name=_("dirección")
    )
    shipping_city = models.CharField(
        max_length=64, blank=False, verbose_name=_("ciudad")
    )
    shipping_state = models.CharField(
        max_length=64, blank=False, verbose_name=_("región")
    )
    shipping_country = models.CharField(
        max_length=64, blank=False, verbose_name=_("país")
    )
    shipping_zip = models.CharField(
        max_length=32, blank=False, verbose_name=_("código postal")
    )
    contact_phone = models.CharField(
        max_length=32, blank=True, verbose_name=_("teléfono de contacto")
    )

    def calculate_total_from_lines(self):
        self.base_total = self.lines.aggregate(base_total=models.Sum("base_total")).get(
            "base_total"
        )
        self.total = self.lines.aggregate(base_total=models.Sum("total")).get(
            "base_total"
        )

        self.save()

    class Meta:
        verbose_name = _("pedido")
        verbose_name_plural = _("pedidos")


class Cart(models.Model):
    uuid = models.UUIDField(default=uuid4, primary_key=True, verbose_name=_("uuid"))
    user = models.ForeignKey(
        User,
        on_delete=models.CASCADE,
        verbose_name=_("usuario"),
        blank=True,
        null=True,
    )
    creation_date = models.DateTimeField(
        auto_now_add=True, verbose_name=_("fecha de creación")
    )

    class Meta:
        verbose_name = _("carrito")
        verbose_name_plural = _("carritos")


class CartItem(models.Model):
    cart = models.ForeignKey(
        "shop.Cart",
        on_delete=models.CASCADE,
        related_name="items",
        verbose_name=_("carrito"),
    )
    product = models.ForeignKey(
        "shop.Product", on_delete=models.CASCADE, verbose_name=_("producto")
    )
    quantity = models.PositiveIntegerField(default=1, verbose_name=_("cantidad"))

    class Meta:
        verbose_name = _("línea de carrito")
        verbose_name_plural = _("líneas de carrito")


class CustomerAddress(models.Model):
    class Types(models.TextChoices):
        BILLING = "BILL", _("facturación")
        SHIPPING = "SHIP", _("envío")

    user = models.ForeignKey(User, on_delete=models.CASCADE, null=True, verbose_name=_("usuario"))
    vat_id = models.CharField(
        max_length=16,
        blank=True,
        null=True,
        default="",
        verbose_name=_("número de identificación fiscal"),
    )
    full_name = models.CharField(
        max_length=128, blank=False, null=False, verbose_name=_("dirección")
    )
    address = models.CharField(
        max_length=128, blank=False, null=False, verbose_name=_("dirección")
    )
    address_town = models.CharField(
        max_length=64, blank=False, null=False, verbose_name=_("localidad")
    )
    address_zip = models.CharField(
        max_length=16, blank=False, null=False, verbose_name=_("código postal")
    )
    address_state = models.CharField(
        max_length=64, blank=False, null=False, verbose_name=_("provincia")
    )
    address_country = models.CharField(
        max_length=64,
        default=settings.SHOP_COUNTRY,
        blank=False,
        null=False,
        verbose_name=_("país"),
    )
    address_phone = models.CharField(
        max_length=16, blank=True, null=True, default="", verbose_name=_("teléfono")
    )

    address_type = models.CharField(
        max_length=4,
        choices=Types.choices,
        default=Types.SHIPPING,
        verbose_name=_("tipo de dirección"),
    )
    default = models.BooleanField(default=True, verbose_name=_("por defecto"))
    hidden = models.BooleanField(default=False, db_index=True, verbose_name=_("oculto"))

    class Meta:
        verbose_name = _("dirección de cliente")
        verbose_name_plural = _("direcciones de cliente")


class ShippingMethod(models.Model):
    name = models.CharField(max_length=64, verbose_name=_("nombre"))
    description = models.CharField(
        max_length=256, default="", blank=True, verbose_name=_("description")
    )
    url = models.URLField(default="", blank=True, verbose_name=_("url"))
    shipping_product = models.ForeignKey(
        "shop.Product", on_delete=models.CASCADE, verbose_name=_("producto de envío")
    )
    enabled = models.BooleanField(default=True, verbose_name=_("habilitado"))

    class Meta:
        verbose_name = _("método de envío")
        verbose_name_plural = _("métodos de envío")