from django.db import models
from django.utils.translation import gettext_lazy as _
from django.contrib.auth.models import User
from django.utils.text import slugify
from decimal import Decimal
from django.core.validators import MinValueValidator
from django.utils import timezone

# Create your models here.

class FursuitGallery(models.Model):
    name = models.CharField(_('Name'), max_length=200)
    slug = models.SlugField(unique=True)
    description = models.TextField(_('Description'))
    description_en = models.TextField(_('Description (English)'))
    created_at = models.DateTimeField(auto_now_add=True)
    
    def save(self, *args, **kwargs):
        if not self.slug:
            self.slug = slugify(self.name)
        super().save(*args, **kwargs)
    
    class Meta:
        verbose_name = _('Fursuit Gallery')
        verbose_name_plural = _('Fursuit Galleries')
    
    def __str__(self):
        return self.name

class GalleryImage(models.Model):
    gallery = models.ForeignKey(FursuitGallery, on_delete=models.CASCADE, related_name='images')
    image = models.ImageField(upload_to='gallery/')
    title = models.CharField(_('Title'), max_length=200, blank=True)
    description = models.TextField(_('Description'), blank=True)
    order = models.PositiveIntegerField(default=0)
    created_at = models.DateTimeField(auto_now_add=True)
    
    class Meta:
        ordering = ['order', 'created_at']

class Category(models.Model):
    name = models.CharField(_('Name'), max_length=100)
    slug = models.SlugField(_('Slug'), max_length=100, unique=True)
    description = models.TextField(_('Beschreibung'), blank=True)
    image = models.ImageField(_('Bild'), upload_to='categories/', blank=True)
    parent = models.ForeignKey('self', verbose_name=_('Übergeordnete Kategorie'),
                             on_delete=models.CASCADE, null=True, blank=True, 
                             related_name='children')
    
    class Meta:
        verbose_name = _('Kategorie')
        verbose_name_plural = _('Kategorien')
        ordering = ['name']

    def __str__(self):
        return self.name

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

class ProductType(models.Model):
    name = models.CharField(_('Name'), max_length=100)
    has_sizes = models.BooleanField(_('Hat Größen'), default=False)
    has_colors = models.BooleanField(_('Hat Farben'), default=False)
    has_custom_design = models.BooleanField(_('Erlaubt Custom Design'), default=False)
    requires_measurements = models.BooleanField(_('Benötigt Maße'), default=False)

    class Meta:
        verbose_name = _('Produkttyp')
        verbose_name_plural = _('Produkttypen')

    def __str__(self):
        return self.name

class Product(models.Model):
    category = models.ForeignKey(Category, verbose_name=_('Kategorie'),
                               on_delete=models.CASCADE, related_name='products')
    product_type = models.ForeignKey(ProductType, verbose_name=_('Produkttyp'),
                                   on_delete=models.CASCADE)
    name = models.CharField(_('Name'), max_length=200)
    slug = models.SlugField(_('Slug'), max_length=200, unique=True, default='')
    description = models.TextField(_('Beschreibung'))
    price = models.DecimalField(_('Preis'), max_digits=10, decimal_places=2,
                              validators=[MinValueValidator(Decimal('0.01'))],
                              default=Decimal('0.00'))
    stock = models.PositiveIntegerField(_('Lagerbestand'), default=0)
    available = models.BooleanField(_('Verfügbar'), default=True)
    created = models.DateTimeField(_('Erstellt'), default=timezone.now)
    updated = models.DateTimeField(_('Aktualisiert'), auto_now=True)
    image = models.ImageField(_('Hauptbild'), upload_to='products/')
    
    class Meta:
        verbose_name = _('Produkt')
        verbose_name_plural = _('Produkte')
        ordering = ['-created']

    def __str__(self):
        return self.name

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

class ProductImage(models.Model):
    product = models.ForeignKey(Product, verbose_name=_('Produkt'),
                              on_delete=models.CASCADE, related_name='images')
    image = models.ImageField(_('Bild'), upload_to='products/')
    alt_text = models.CharField(_('Alternativer Text'), max_length=200, blank=True)
    is_feature = models.BooleanField(_('Ist Hauptbild'), default=False)
    created = models.DateTimeField(_('Erstellt'), default=timezone.now)

    class Meta:
        verbose_name = _('Produktbild')
        verbose_name_plural = _('Produktbilder')
        ordering = ['-is_feature', '-created']

class ProductVariant(models.Model):
    SIZE_CHOICES = [
        ('XS', 'Extra Small'),
        ('S', 'Small'),
        ('M', 'Medium'),
        ('L', 'Large'),
        ('XL', 'Extra Large'),
        ('XXL', '2X Large'),
        ('XXXL', '3X Large'),
    ]

    product = models.ForeignKey(Product, verbose_name=_('Produkt'),
                              on_delete=models.CASCADE, related_name='variants')
    size = models.CharField(_('Größe'), max_length=10, choices=SIZE_CHOICES, blank=True)
    color = models.CharField(_('Farbe'), max_length=50, blank=True)
    sku = models.CharField(_('Artikelnummer'), max_length=50, unique=True)
    price_adjustment = models.DecimalField(_('Preisanpassung'), 
                                         max_digits=10, decimal_places=2, default=0)
    stock = models.PositiveIntegerField(_('Lagerbestand'), default=0)
    image = models.ImageField(_('Variantenbild'), upload_to='variants/', blank=True)

    class Meta:
        verbose_name = _('Produktvariante')
        verbose_name_plural = _('Produktvarianten')
        unique_together = ['product', 'size', 'color']

    def __str__(self):
        variant_parts = []
        if self.size:
            variant_parts.append(f"Größe: {self.size}")
        if self.color:
            variant_parts.append(f"Farbe: {self.color}")
        return f"{self.product.name} ({', '.join(variant_parts)})"

class CustomDesign(models.Model):
    STATUS_CHOICES = [
        ('pending', _('Ausstehend')),
        ('approved', _('Genehmigt')),
        ('rejected', _('Abgelehnt')),
        ('in_progress', _('In Bearbeitung')),
        ('completed', _('Abgeschlossen')),
    ]

    product = models.ForeignKey(Product, verbose_name=_('Produkt'),
                              on_delete=models.CASCADE, related_name='custom_designs')
    customer = models.ForeignKey('auth.User', verbose_name=_('Kunde'),
                               on_delete=models.CASCADE)
    design_file = models.FileField(_('Design-Datei'), upload_to='designs/')
    notes = models.TextField(_('Anmerkungen'))
    created = models.DateTimeField(_('Erstellt'), default=timezone.now)
    status = models.CharField(_('Status'), max_length=20, choices=STATUS_CHOICES, default='pending')

    class Meta:
        verbose_name = _('Custom Design')
        verbose_name_plural = _('Custom Designs')
        ordering = ['-created']

    def __str__(self):
        return f"Custom Design für {self.product.name} von {self.customer.username}"

class DesignTemplate(models.Model):
    name = models.CharField(_('Name'), max_length=200)
    name_en = models.CharField(_('Name (English)'), max_length=200)
    description = models.TextField(_('Description'))
    description_en = models.TextField(_('Description (English)'))
    image = models.ImageField(upload_to='designs/')
    model_3d = models.FileField(_('3D Model'), upload_to='3d_models/', null=True, blank=True)
    created_at = models.DateTimeField(auto_now_add=True)
    
    def __str__(self):
        return self.name

class CustomerDesign(models.Model):
    user = models.ForeignKey(User, on_delete=models.CASCADE)
    name = models.CharField(_('Design Name'), max_length=200)
    design_file = models.FileField(upload_to='customer_designs/')
    notes = models.TextField(_('Notes'), blank=True)
    created_at = models.DateTimeField(auto_now_add=True)
    
    def __str__(self):
        return f"{self.user.username} - {self.name}"

class Order(models.Model):
    STATUS_CHOICES = [
        ('pending', _('Pending')),
        ('confirmed', _('Confirmed')),
        ('in_progress', _('In Progress')),
        ('completed', _('Completed')),
        ('cancelled', _('Cancelled')),
    ]
    
    PAYMENT_METHODS = [
        ('paypal', 'PayPal'),
        ('credit_card', _('Credit Card')),
        ('bank_transfer', _('Bank Transfer')),
    ]
    
    user = models.ForeignKey(User, on_delete=models.CASCADE)
    product = models.ForeignKey(Product, on_delete=models.CASCADE)
    status = models.CharField(max_length=20, choices=STATUS_CHOICES, default='pending')
    payment_method = models.CharField(max_length=20, choices=PAYMENT_METHODS)
    customer_design = models.ForeignKey(CustomerDesign, on_delete=models.SET_NULL, null=True, blank=True)
    design_template = models.ForeignKey(DesignTemplate, on_delete=models.SET_NULL, null=True, blank=True)
    special_instructions = models.TextField(blank=True)
    
    # Nur für Fursuits
    measurements = models.JSONField(null=True, blank=True)
    
    created_at = models.DateTimeField(auto_now_add=True)
    updated_at = models.DateTimeField(auto_now=True)
    total_price = models.DecimalField(max_digits=10, decimal_places=2, default=Decimal('0.00'))

    def __str__(self):
        return f"Order {self.id} - {self.product.name}"

class OrderProgress(models.Model):
    order = models.ForeignKey(Order, on_delete=models.CASCADE, related_name='progress_updates')
    title = models.CharField(_('Title'), max_length=200)
    description = models.TextField(_('Description'))
    image = models.ImageField(upload_to='progress/', null=True, blank=True)
    created_at = models.DateTimeField(auto_now_add=True)
    
    class Meta:
        ordering = ['-created_at']
    
    def __str__(self):
        return f"Progress update for Order {self.order.id}"

class Cart(models.Model):
    user = models.ForeignKey(User, on_delete=models.CASCADE)
    created_at = models.DateTimeField(auto_now_add=True)
    updated_at = models.DateTimeField(auto_now=True)

    def get_total(self):
        return sum(item.get_subtotal() for item in self.items.all())

    def __str__(self):
        return f"Cart #{self.id} - {self.user.username}"

class CartItem(models.Model):
    cart = models.ForeignKey(Cart, related_name='items', on_delete=models.CASCADE)
    product = models.ForeignKey(Product, on_delete=models.CASCADE)
    quantity = models.PositiveIntegerField(default=1)
    size = models.CharField(max_length=20, blank=True, null=True)
    notes = models.TextField(blank=True, null=True)
    custom_design = models.ImageField(upload_to='custom_designs/', blank=True, null=True)
    added_at = models.DateTimeField(auto_now_add=True)

    def get_subtotal(self):
        return self.product.base_price * self.quantity

    class Meta:
        ordering = ['-added_at']

    def __str__(self):
        return f"{self.quantity}x {self.product.name} in Cart #{self.cart.id}"

class ShippingAddress(models.Model):
    COUNTRY_CHOICES = [
        ('DE', 'Deutschland'),
        ('AT', 'Österreich'),
        ('CH', 'Schweiz'),
    ]
    
    user = models.ForeignKey(User, on_delete=models.CASCADE)
    first_name = models.CharField(_('First Name'), max_length=100)
    last_name = models.CharField(_('Last Name'), max_length=100)
    email = models.EmailField(_('Email'))
    address = models.CharField(_('Address'), max_length=200)
    city = models.CharField(_('City'), max_length=100)
    zip = models.CharField(_('ZIP Code'), max_length=10)
    country = models.CharField(_('Country'), max_length=2, choices=COUNTRY_CHOICES)
    created_at = models.DateTimeField(auto_now_add=True)
    
    def __str__(self):
        return f"{self.first_name} {self.last_name}, {self.city}"
    
    def get_full_address(self):
        return f"{self.address}, {self.zip} {self.city}, {self.get_country_display()}"

class Checkout(models.Model):
    STATUS_CHOICES = [
        ('address', _('Shipping Address')),
        ('payment', _('Payment Method')),
        ('confirm', _('Confirmation')),
        ('completed', _('Completed')),
    ]
    
    user = models.ForeignKey(User, on_delete=models.CASCADE)
    cart = models.OneToOneField(Cart, on_delete=models.CASCADE)
    shipping_address = models.ForeignKey(ShippingAddress, on_delete=models.SET_NULL, null=True)
    payment_method = models.CharField(_('Payment Method'), max_length=20, choices=Order.PAYMENT_METHODS, null=True)
    status = models.CharField(_('Status'), max_length=20, choices=STATUS_CHOICES, default='address')
    created_at = models.DateTimeField(auto_now_add=True)
    updated_at = models.DateTimeField(auto_now=True)
    
    def __str__(self):
        return f"Checkout #{self.id} - {self.user.username}"
    
    def get_total(self):
        cart_total = self.cart.get_total()
        if cart_total < 200:
            return cart_total + Decimal('5.99')
        return cart_total

class PayPalPayment(models.Model):
    order = models.OneToOneField(Order, on_delete=models.CASCADE, related_name='paypal_payment')
    payment_id = models.CharField(_('PayPal Payment ID'), max_length=100)
    payer_id = models.CharField(_('PayPal Payer ID'), max_length=100)
    status = models.CharField(_('Payment Status'), max_length=20, choices=[
        ('pending', _('Pending')),
        ('completed', _('Completed')),
        ('failed', _('Failed')),
        ('refunded', _('Refunded')),
    ])
    amount = models.DecimalField(_('Amount'), max_digits=10, decimal_places=2)
    currency = models.CharField(_('Currency'), max_length=3, default='EUR')
    created_at = models.DateTimeField(auto_now_add=True)
    updated_at = models.DateTimeField(auto_now=True)
    
    def __str__(self):
        return f"PayPal Payment {self.payment_id} for Order #{self.order.id}"

class PaymentError(models.Model):
    order = models.ForeignKey(Order, on_delete=models.CASCADE, related_name='payment_errors')
    error_code = models.CharField(_('Error Code'), max_length=100)
    error_message = models.TextField(_('Error Message'))
    created_at = models.DateTimeField(auto_now_add=True)
    
    def __str__(self):
        return f"Payment Error for Order #{self.order.id}: {self.error_code}"

class ContactMessage(models.Model):
    name = models.CharField(_('Name'), max_length=100)
    email = models.EmailField(_('E-Mail'))
    subject = models.CharField(_('Betreff'), max_length=200)
    message = models.TextField(_('Nachricht'))
    created_at = models.DateTimeField(_('Erstellt am'), auto_now_add=True)
    
    class Meta:
        verbose_name = _('Kontaktnachricht')
        verbose_name_plural = _('Kontaktnachrichten')
        ordering = ['-created_at']
    
    def __str__(self):
        return f"{self.subject} - {self.name}"