from django.shortcuts import render, get_object_or_404, redirect
from django.http import HttpResponse, Http404
from django.utils import timezone
from django.contrib import messages
from .models import Subscriber, EmailLog
import logging

logger = logging.getLogger(__name__)


def unsubscribe(request, token):
    """Handle unsubscribe requests using the unique token"""
    try:
        subscriber = get_object_or_404(Subscriber, unsubscribe_token=token)
        
        if request.method == 'POST':
            subscriber.is_active = False
            subscriber.save()
            
            context = {
                'success': True,
                'email': subscriber.email
            }
            return render(request, 'mailing/unsubscribe_success.html', context)
        
        context = {
            'subscriber': subscriber
        }
        return render(request, 'mailing/unsubscribe_confirm.html', context)
        
    except Subscriber.DoesNotExist:
        context = {
            'error': True
        }
        return render(request, 'mailing/unsubscribe_error.html', context)


def track_email_open(request, tracking_id):
    """Track email opens using a 1x1 pixel image"""
    try:
        email_log = EmailLog.objects.get(tracking_id=tracking_id)
        
        # Only record the first open
        if not email_log.opened_at:
            email_log.opened_at = timezone.now()
            email_log.save()
            
            # Update campaign statistics
            campaign = email_log.campaign
            campaign.total_opened += 1
            campaign.save()
            
            logger.info(f"Email opened: {email_log.subscriber.email} for campaign {email_log.campaign.name}")
        
    except EmailLog.DoesNotExist:
        logger.warning(f"Tracking ID not found: {tracking_id}")
    
    # Return a 1x1 transparent pixel
    pixel_data = b'\x47\x49\x46\x38\x39\x61\x01\x00\x01\x00\x80\x00\x00\x00\x00\x00\x00\x00\x00\x21\xF9\x04\x01\x00\x00\x00\x00\x2C\x00\x00\x00\x00\x01\x00\x01\x00\x00\x02\x02\x04\x01\x00\x3B'
    return HttpResponse(pixel_data, content_type='image/gif')


def track_email_click(request, tracking_id):
    """Track email clicks and redirect to the original URL"""
    try:
        email_log = EmailLog.objects.get(tracking_id=tracking_id)
        
        # Only record the first click
        if not email_log.clicked_at:
            email_log.clicked_at = timezone.now()
            email_log.save()
            
            # Update campaign statistics
            campaign = email_log.campaign
            campaign.total_clicked += 1
            campaign.save()
            
            logger.info(f"Email clicked: {email_log.subscriber.email} for campaign {email_log.campaign.name}")
        
        # Get the original URL from the query parameter
        original_url = request.GET.get('url', '/')
        return redirect(original_url)
        
    except EmailLog.DoesNotExist:
        logger.warning(f"Tracking ID not found: {tracking_id}")
        return redirect('/')  # Redirect to home if tracking fails