from django.shortcuts import render, get_object_or_404, redirect
from django.contrib.auth.decorators import login_required
from django.db.models import Q
from django.contrib.auth.forms import UserCreationForm
from django.contrib.auth import login
from .models import Course, Instructor, WishlistItem

def course_list(request):
    query = request.GET.get('q', '')
    level = request.GET.get('level', '')
    
    courses = Course.objects.all()
    
    if query:
        courses = courses.filter(
            Q(title__icontains=query) | Q(description__icontains=query)
        )
    
    if level:
        courses = courses.filter(level=level)
    
    context = {
        'courses': courses,
        'query': query,
        'level': level,
        'levels': ['Beginner', 'Intermediate', 'Advanced']
    }
    return render(request, 'core/index.html', context)

def course_detail(request, slug):
    course = get_object_or_404(Course, slug=slug)
    is_in_wishlist = False
    if request.user.is_authenticated:
        is_in_wishlist = WishlistItem.objects.filter(user=request.user, course=course).exists()
    
    context = {
        'course': course,
        'is_in_wishlist': is_in_wishlist
    }
    return render(request, 'core/course_detail.html', context)

def instructor_detail(request, pk):
    instructor = get_object_or_404(Instructor, pk=pk)
    return render(request, 'core/instructor_detail.html', {'instructor': instructor})

@login_required
def wishlist(request):
    items = WishlistItem.objects.filter(user=request.user)
    return render(request, 'core/wishlist.html', {'items': items})

@login_required
def toggle_wishlist(request, course_id):
    course = get_object_or_404(Course, id=course_id)
    wishlist_item, created = WishlistItem.objects.get_or_create(user=request.user, course=course)
    
    if not created:
        wishlist_item.delete()
    
    return redirect(request.META.get('HTTP_REFERER', 'home'))

def checkout_placeholder(request, course_id):
    course = get_object_or_404(Course, id=course_id)
    return render(request, 'core/checkout_placeholder.html', {'course': course})

def signup(request):
    if request.method == 'POST':
        form = UserCreationForm(request.POST)
        if form.is_valid():
            user = form.save()
            login(request, user)
            return redirect('home')
    else:
        form = UserCreationForm()
    return render(request, 'registration/signup.html', {'form': form})