from django.core.mail import EmailMultiAlternatives
from django.template.loader import render_to_string
from django.utils.translation import gettext as _
from django.conf import settings
from django.urls import reverse
from django.contrib.sites.shortcuts import get_current_site

def send_order_confirmation(request, order):
    """
    Sendet eine Bestellbestätigungs-E-Mail an den Kunden
    """
    context = {
        'order': order,
        'logo_url': f"{settings.STATIC_URL}images/logo.png",
        'order_url': request.build_absolute_uri(
            reverse('shop:my_orders')
        )
    }
    
    # HTML-Version
    html_content = render_to_string(
        'shop/emails/order_confirmation.html',
        context
    )
    
    # Text-Version
    text_content = render_to_string(
        'shop/emails/order_confirmation.txt',
        context
    )
    
    subject = _('Order Confirmation - Order #{}').format(order.id)
    from_email = settings.DEFAULT_FROM_EMAIL
    to_email = order.shipping_address.email
    
    msg = EmailMultiAlternatives(
        subject,
        text_content,
        from_email,
        [to_email]
    )
    msg.attach_alternative(html_content, "text/html")
    msg.send()

def send_order_status_update(request, order, update=None):
    """
    Sendet eine E-Mail über Statusänderungen der Bestellung
    """
    context = {
        'order': order,
        'update': update,
        'logo_url': f"{settings.STATIC_URL}images/logo.png",
        'order_url': request.build_absolute_uri(
            reverse('shop:my_orders')
        )
    }
    
    # HTML-Version
    html_content = render_to_string(
        'shop/emails/order_status_update.html',
        context
    )
    
    # Text-Version
    text_content = render_to_string(
        'shop/emails/order_status_update.txt',
        context
    )
    
    subject = _('Order Status Update - Order #{}').format(order.id)
    from_email = settings.DEFAULT_FROM_EMAIL
    to_email = order.shipping_address.email
    
    msg = EmailMultiAlternatives(
        subject,
        text_content,
        from_email,
        [to_email]
    )
    msg.attach_alternative(html_content, "text/html")
    msg.send()

def send_shipping_confirmation(request, order):
    """
    Sendet eine Versandbestätigungs-E-Mail mit Tracking-Nummer
    """
    context = {
        'order': order,
        'logo_url': f"{settings.STATIC_URL}images/logo.png",
        'order_url': request.build_absolute_uri(
            reverse('shop:my_orders')
        )
    }
    
    # HTML-Version
    html_content = render_to_string(
        'shop/emails/shipping_confirmation.html',
        context
    )
    
    # Text-Version
    text_content = render_to_string(
        'shop/emails/shipping_confirmation.txt',
        context
    )
    
    subject = _('Your Order Has Been Shipped - Order #{}').format(order.id)
    from_email = settings.DEFAULT_FROM_EMAIL
    to_email = order.shipping_address.email
    
    msg = EmailMultiAlternatives(
        subject,
        text_content,
        from_email,
        [to_email]
    )
    msg.attach_alternative(html_content, "text/html")
    msg.send()

def send_admin_notification(request, order, notification_type, extra_context=None):
    """
    Sendet eine Benachrichtigung an den Shop-Administrator
    """
    context = {
        'order': order,
        'notification_type': notification_type,
        'logo_url': f"{settings.STATIC_URL}images/logo.png",
        'order_url': request.build_absolute_uri(
            reverse('admin:shop_order_change', args=[order.id])
        )
    }
    
    if extra_context:
        context.update(extra_context)
    
    # HTML-Version
    html_content = render_to_string(
        'shop/emails/admin_notification.html',
        context
    )
    
    # Text-Version
    text_content = render_to_string(
        'shop/emails/admin_notification.txt',
        context
    )
    
    # Betreff basierend auf Benachrichtigungstyp
    subjects = {
        'new_order': _('New Order Received - Order #{}'),
        'payment_failed': _('Payment Failed - Order #{}'),
        'custom_design': _('New Custom Design Order #{}'),
        'fursuit_order': _('New Fursuit Order #{}'),
    }
    
    subject = subjects.get(notification_type, _('Order Notification - Order #{}')).format(order.id)
    
    # E-Mail an alle konfigurierten Admin-E-Mail-Adressen senden
    admin_emails = [email for name, email in settings.ADMINS]
    
    if admin_emails:
        msg = EmailMultiAlternatives(
            subject,
            text_content,
            settings.DEFAULT_FROM_EMAIL,
            admin_emails
        )
        msg.attach_alternative(html_content, "text/html")
        msg.send()

def send_low_stock_notification(request, product):
    """
    Benachrichtigt den Admin über niedrigen Lagerbestand
    """
    context = {
        'product': product,
        'logo_url': f"{settings.STATIC_URL}images/logo.png",
        'product_url': request.build_absolute_uri(
            reverse('admin:shop_product_change', args=[product.id])
        )
    }
    
    # HTML-Version
    html_content = render_to_string(
        'shop/emails/low_stock_notification.html',
        context
    )
    
    # Text-Version
    text_content = render_to_string(
        'shop/emails/low_stock_notification.txt',
        context
    )
    
    subject = _('Low Stock Alert - {}').format(product.name)
    admin_emails = [email for name, email in settings.ADMINS]
    
    if admin_emails:
        msg = EmailMultiAlternatives(
            subject,
            text_content,
            settings.DEFAULT_FROM_EMAIL,
            admin_emails
        )
        msg.attach_alternative(html_content, "text/html")
        msg.send()