from django.core.validators import MinValueValidator
from django.db import models
from django.urls import reverse
from django.utils.text import slugify


class ProductCategory(models.Model):
    name = models.CharField(max_length=120, unique=True)
    slug = models.SlugField(max_length=140, unique=True, blank=True)
    description = models.TextField(blank=True)
    accent = models.CharField(max_length=20, default="#00D1FF")
    icon = models.CharField(max_length=40, default="bi-cpu")
    is_active = models.BooleanField(default=True)
    sort_order = models.PositiveIntegerField(default=0)

    class Meta:
        ordering = ["sort_order", "name"]
        verbose_name = "categoría de producto"
        verbose_name_plural = "categorías de productos"

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

    def __str__(self):
        return self.name


class Product(models.Model):
    category = models.ForeignKey(ProductCategory, on_delete=models.PROTECT, related_name="products")
    name = models.CharField(max_length=160)
    slug = models.SlugField(max_length=180, unique=True, blank=True)
    short_description = models.CharField(max_length=240)
    description = models.TextField()
    price_from = models.DecimalField(max_digits=10, decimal_places=2, validators=[MinValueValidator(0)])
    delivery_time = models.CharField(max_length=80, default="A convenir")
    is_featured = models.BooleanField(default=False)
    is_active = models.BooleanField(default=True)
    created_at = models.DateTimeField(auto_now_add=True)
    updated_at = models.DateTimeField(auto_now=True)

    class Meta:
        ordering = ["category__sort_order", "name"]
        verbose_name = "producto/servicio"
        verbose_name_plural = "productos y servicios"

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

    def get_absolute_url(self):
        return reverse("product_detail", kwargs={"slug": self.slug})

    def __str__(self):
        return self.name


class PaymentConfirmation(models.Model):
    METHOD_TRANSFERMOVIL = "transfermovil"
    METHOD_ENZONA = "enzona"
    METHOD_QR = "qr"
    METHOD_BANK = "transferencia"
    PAYMENT_METHODS = [
        (METHOD_TRANSFERMOVIL, "Transfermóvil"),
        (METHOD_ENZONA, "Enzona"),
        (METHOD_QR, "Código QR"),
        (METHOD_BANK, "Transferencia bancaria"),
    ]

    STATUS_PENDING = "pendiente"
    STATUS_APPROVED = "aprobado"
    STATUS_REJECTED = "rechazado"
    STATUS_CHOICES = [
        (STATUS_PENDING, "Pendiente"),
        (STATUS_APPROVED, "Aprobado"),
        (STATUS_REJECTED, "Rechazado"),
    ]

    product = models.ForeignKey(Product, on_delete=models.SET_NULL, null=True, blank=True, related_name="payment_confirmations")
    customer_name = models.CharField(max_length=140)
    customer_phone = models.CharField(max_length=40)
    customer_email = models.EmailField(blank=True)
    amount = models.DecimalField(max_digits=10, decimal_places=2, validators=[MinValueValidator(1)])
    method = models.CharField(max_length=30, choices=PAYMENT_METHODS)
    reference = models.CharField(max_length=120)
    note = models.TextField(blank=True)
    receipt = models.FileField(upload_to="payment_receipts/", blank=True)
    status = models.CharField(max_length=20, choices=STATUS_CHOICES, default=STATUS_PENDING)
    admin_note = models.TextField(blank=True)
    created_at = models.DateTimeField(auto_now_add=True)
    reviewed_at = models.DateTimeField(null=True, blank=True)

    class Meta:
        ordering = ["-created_at"]
        verbose_name = "confirmación de pago"
        verbose_name_plural = "confirmaciones de pago"

    def __str__(self):
        return f"{self.customer_name} · {self.get_method_display()} · {self.amount}"