import stripe
from django.http import HttpResponse, HttpResponseBadRequest
from django.core.mail import send_mail
from django.conf import settings
from django.contrib.auth.decorators import login_required
from django.shortcuts import get_object_or_404
from django.shortcuts import redirect
from django.shortcuts import render
from django.views import View
from django.views.generic import TemplateView
from django.views.decorators.csrf import csrf_exempt

from alphabetlearning.resources.models import Resource
from alphabetlearning.users.models import User

from .models import CartItem
from .models import Price
from .models import Product
from .models import ShoppingCart

# TODO get the cart integrated with Stripe
# Steps to convert our Cart into something that can be used with Stripe:
#
#    - Fix the total in the cart
#    - X Sort out the webhook
#    - Associate the purchases with the users profile page
#    - We need a profile page!
#        - Link in navbar (when logged in)
#    - Fix the email and make it nice
#    - Associate each of our resources with a Product item
#        - this should be done in the create resource page
#        - or we can do it manually for the time being
#    - X Check that we can add resources to the cart
#    - X When the user hits the cart page, each associated product is pulled from the database
#    - X prices are extracted from the products accordingly
#    - X use the form from the landingpage.html as the checkout button to call the create-checkout-session
#    - Add delete buttons the checkout page, etc


stripe.api_key = settings.STRIPE_SECRET_KEY

def create_line_items(resources):
   price_objs = [r.price_obj.first() for r in resources]
   stripe_price_ids = [p.stripe_price_id for p in price_objs]
   return [{"quantity": 1, "price": s} for s in stripe_price_ids]
   pass

class CreateCheckoutSessionView(View):
    def post(self, request, *args, **kwargs):
        #price = Price.objects.get(id=self.kwargs["pk"])
        cart = ShoppingCart.objects.get(id=self.kwargs["pk"])
        resources = [i.resource for i in cart.items.all()]
        total = sum([r.price_obj.first().price for r in resources])
        domain = "http://localhost:8000"
        checkout_session = stripe.checkout.Session.create(
            payment_method_types=["card"],
            customer_email=request.user.email,
            line_items=create_line_items(resources),
            mode="payment",
            success_url=domain + "/payments/success/",
            cancel_url=domain + "/payments/cancel/",
        )
        return redirect(checkout_session.url, code=303)


class SuccessView(TemplateView):
    template_name = "payments/success.html"


class CancelView(TemplateView):
    template_name = "payments/cancel.html"


class ProductLandingPageView(TemplateView):
    template_name = "payments/landingpage.html"

    def get_context_data(self, **kwargs):
        resource = Resource.objects.get(id=91)
        prices = Price.objects.filter(resource=resource)
        context = super(ProductLandingPageView, self).get_context_data(**kwargs)
        context.update({"resource": resource, "prices": prices})
        return context


@login_required
def add_to_cart(request, resource_id):
    resource = get_object_or_404(Resource, id=resource_id)
    cart, created = ShoppingCart.objects.get_or_create(user=request.user)
    cart_item, created = CartItem.objects.get_or_create(cart=cart, resource=resource)
    # cart_item.quantity += 1
    cart_item.save()
    return redirect("payments:cart_detail")


@login_required
def cart_detail(request):
    cart, created = ShoppingCart.objects.get_or_create(user=request.user)
    resources = [i.resource for i in cart.items.all()]
    try:
        total = sum([r.price_obj.first().price for r in resources])
    except AttributeError:
        return HttpResponseBadRequest(f"There is no price assigned to at least one of the resources you have added to the basket. Please contact Alphabet Learning Support.")
    context = {
            "cart": cart,
            "resources": resources,
            "total": total
    }
    return render(request, "payments/cart_detail.html", context)


# def cart_detail(request):
#     cart, created = ShoppingCart.objects.get_or_create(user=request.user)
#     return render(request, "payments/cart_detail.html", {"cart": cart})


@login_required
def checkout(request):
    cart = ShoppingCart.objects.get(user=request.user)
    total = sum(item.get_total_price() for item in cart.items.all())

    if request.method == "POST":
        # Create Stripe PaymentIntent
        intent = stripe.PaymentIntent.create(
            amount=int(total * 100),  # Stripe amount is in cents
            currency="usd",
            automatic_payment_methods={"enabled": True},
        )

        # Redirect to Stripe checkout or handle payment confirmation
        return render(request, "cart/checkout_success.html")

    return render(request, "cart/checkout.html", {"cart": cart, "total": total})


@csrf_exempt
def stripe_webhook(request):
    payload = request.body
    sig_header = request.META["HTTP_STRIPE_SIGNATURE"]
    event = None

    # verify that the request came from STRIPE
    try:
        event = stripe.Webhook.construct_event(payload, sig_header, settings.STRIPE_WEBHOOK_SECRET)
    except ValueError as e:
        return HttpResponse(status=400)
    except stripe.error.SignatureVerificationError as e:
        return HttpResponse(status=400)

    if event["type"] == "checkout.session.completed":
        session = event["data"]["object"]
        customer_email = session["customer_details"]["email"]
        payment_intent = session["payment_intent"]

        # TODO Add the items to the users profile page
        # This should be done before deleting the cart otherwise we have no record of what they bought

        # TODO clear their shopping cart - we need to obtain their user ID
        user = User.objects.get(email=customer_email)
        ShoppingCart.objects.get(user=user).delete()
        print(f"Deleted cart for {user}")

        # TODO add the transaction to our local history? Or just use Stripe?


        # TODO send an email to the customer
        send_mail(
                "Thank you for your purchase",
                "You have bought something nice - enjoy it",
                settings.DEFAULT_FROM_EMAIL,
                [customer_email],
                fail_silently=False,
        )


    return HttpResponse(status=200)