goodtimes/manage_subscriptions/views.py

from decimal import Decimal
import json
from django.http import HttpResponseBadRequest, JsonResponse
from django.shortcuts import get_object_or_404, redirect, render
import stripe
from accounts import resource_action
from accounts.models import IAmPrincipal
from django.contrib.auth import login
import jwt
from django.utils import timezone
from django.contrib.auth import get_user_model
from manage_coupons.models import Coupon
from manage_subscriptions.forms import (
    StripeProductForm,
    SubscriptionForm,
    PrincipalSubscriptionForm,
)
from manage_wallets.models import (
    PaymentMethod,
    Transaction,
    TransactionStatus,
    TransactionType,
)
from .models import Plan, StripeProduct, Subscription, PrincipalSubscription
from django.views import generic
from django.contrib.auth.mixins import LoginRequiredMixin
from django.urls import reverse_lazy
from django.contrib import messages
from goodtimes import constants
from django.views.decorators.csrf import csrf_exempt
from django.views.decorators.http import require_POST
from django.conf import settings
from django.views.generic.base import TemplateView
from django.db.models import Q

# Create your views here.


class SubscriptionCreateOrUpdateView(LoginRequiredMixin, generic.View):
    # Set the page_name and resource
    page_name = resource_action.RESOURCE_MANAGE_SUBSCRIPTIONS
    resource = resource_action.RESOURCE_MANAGE_SUBSCRIPTIONS

    # Initialize the action as ACTION_CREATE (can change based on logic)
    action = resource_action.ACTION_CREATE  # Default action

    template_name = "manage_subscriptions/subscription_add.html"
    model = Subscription
    form_class = SubscriptionForm
    success_url = reverse_lazy("manage_subscriptions:subscription_list")
    error_message = "An error occurred while saving the data."

    # Determine the success message dynamically based on whether it's an update or create
    def get_success_message(self):
        self.success_message = (
            constants.RECORD_CREATED if not self.object else constants.RECORD_UPDATED
        )
        return self.success_message

    # Get the object (if exists) based on URL parameter 'pk'
    def get_object(self):
        pk = self.kwargs.get("pk")
        return get_object_or_404(self.model, pk=pk) if pk else None

    # Add page_name and operation to the context
    def get_context_data(self, **kwargs):
        context = {
            "page_name": self.page_name,
            "operation": "Add" if not self.object else "Edit",
        }
        context.update(kwargs)  # Include any additional context data passed to the view
        return context

    def get(self, request, *args, **kwargs):
        self.object = self.get_object()

        # If an object is found, change action to ACTION_UPDATE
        if self.object is not None:
            self.action = resource_action.ACTION_UPDATE

        form = self.form_class(instance=self.object)
        context = self.get_context_data(form=form)
        return render(request, self.template_name, context=context)

    def post(self, request, *args, **kwargs):
        self.object = self.get_object()

        # If an object is found, change action to ACTION_UPDATE
        if self.object is not None:
            self.action = resource_action.ACTION_UPDATE

        form = self.form_class(request.POST, instance=self.object)
        if not form.is_valid():
            print(form.errors)
            context = self.get_context_data(form=form)
            return render(request, self.template_name, context=context)

        # This code ensures that only one free plan can be created by checking for existing free plans before saving a new one.
        if form.cleaned_data.get("is_free"):
            if self.model.objects.filter(Q(is_free=True) & Q(active=True)).exists():
                messages.error(
                    self.request,
                    "A free plan is already available. Please deactivate the existing one before creating a new one.",
                )
                context = self.get_context_data(form=form)
                return render(request, self.template_name, context=context)

        # Processing Stripe price creation and handling free subscription
        success, message = self.handle_stripe_price(form)
        if not success:
            messages.error(self.request, message)
            context = self.get_context_data(form=form)
            return render(request, self.template_name, context=context)

        form.save()
        messages.success(self.request, self.get_success_message())
        return redirect(self.success_url)

    def handle_stripe_price(self, form):
        try:
            stripe.api_key = settings.STRIPE_SECRET_KEY
            stripe_product_id = (
                form.instance.stripe_product.product_id
                if form.instance.stripe_product
                else None
            )
            # creating Stripe price only if the subscription is not free
            if not form.cleaned_data.get("is_free") and stripe_product_id:
                # Getting Stripe Product ID
                stripe_product = form.instance.stripe_product
                plan = form.instance.plan

                # Map the Plan interval to Stripe's recurring interval
                # It will only work if the plan title is 'month', 'year' 'week' or 'day'
                stripe_interval = plan.title
                # Create the Stripe price
                stripe_price = stripe.Price.create(
                    unit_amount=int(
                        form.cleaned_data["amount"] * 100
                    ),  # Amount in cents
                    currency="gbp",  # Adjust the currency as needed
                    recurring={
                        "interval": stripe_interval
                    },  # Use the interval from Plan
                    product=stripe_product.product_id,
                )
                # Assign the Stripe price ID to the subscription
                form.instance.price_id = stripe_price.id
            else:
                form.instance.price_id = None  # No price ID for free subscriptions

            return True, ""  # Success
        except stripe.error.StripeError as e:
            return False, f"Stripe error: {str(e)}"
        except Exception as e:
            return False, f"An error occurred: {str(e)}"


class SubscriptionView(LoginRequiredMixin, generic.ListView):
    page_name = resource_action.RESOURCE_MANAGE_SUBSCRIPTIONS
    resource = resource_action.RESOURCE_MANAGE_SUBSCRIPTIONS
    action = resource_action.ACTION_READ
    model = Subscription
    template_name = "manage_subscriptions/subscription_list.html"
    context_object_name = "subscription_obj"

    def get_queryset(self):
        queryset = (
            super()
            .get_queryset()
            .filter(deleted=False, active=True)
            .prefetch_related("principal_types")
        )
        return queryset.order_by("-created_on")

    def get_context_data(self, **kwargs):
        context = super().get_context_data(**kwargs)
        context["page_name"] = self.page_name
        return context


class SubscriptionDeleteView(LoginRequiredMixin, generic.View):
    page_name = resource_action.RESOURCE_MANAGE_SUBSCRIPTIONS
    resource = resource_action.RESOURCE_MANAGE_SUBSCRIPTIONS
    action = resource_action.ACTION_DELETE
    model = Subscription
    success_url = reverse_lazy("manage_subscriptions:subscription_list")
    success_message = constants.RECORD_DELETED
    error_message = constants.RECORD_NOT_FOUND

    def get(self, request, pk):
        try:
            # Retrieve the subscription object
            subscription = self.model.objects.get(id=pk)

            # Checking if there is a Stripe Price ID associated with the subscription
            stripe_price_id = subscription.price_id
            if stripe_price_id:
                stripe.api_key = settings.STRIPE_SECRET_KEY

                try:
                    # Updating the Stripe price to mark it as inactive
                    stripe.Price.modify(stripe_price_id, active=False)
                except stripe.error.StripeError as e:
                    # Handle Stripe errors
                    messages.error(request, f"Stripe error: {str(e)}")
                    return redirect(self.success_url)

            # Updating the subscription model record
            subscription.deleted = True
            subscription.active = False
            subscription.save()

            messages.success(request, self.success_message)

        except self.model.DoesNotExist:
            messages.error(request, self.error_message)

        return redirect(self.success_url)


class StripeProductCreateOrUpdateView(LoginRequiredMixin, generic.View):
    # Set the page_name and resource
    page_name = resource_action.RESOURCE_MANAGE_SUBSCRIPTIONS
    resource = resource_action.RESOURCE_MANAGE_SUBSCRIPTIONS

    # Initialize the action as ACTION_CREATE (can change based on logic)
    action = resource_action.ACTION_CREATE  # Default action

    template_name = "manage_subscriptions/product_add.html"
    model = StripeProduct
    form_class = StripeProductForm
    success_url = reverse_lazy("manage_subscriptions:stripe_product_list")
    error_message = "An error occurred while saving the data."

    # Determine the success message dynamically based on whether it's an update or create
    def get_success_message(self):
        self.success_message = (
            constants.RECORD_CREATED if not self.object else constants.RECORD_UPDATED
        )
        return self.success_message

    # Get the object (if exists) based on URL parameter 'pk'
    def get_object(self):
        pk = self.kwargs.get("pk")
        return get_object_or_404(self.model, pk=pk) if pk else None

    # Add page_name and operation to the context
    def get_context_data(self, **kwargs):
        context = {
            "page_name": self.page_name,
            "operation": "Add" if not self.object else "Edit",
        }
        context.update(kwargs)  # Include any additional context data passed to the view
        return context

    def get(self, request, *args, **kwargs):
        self.object = self.get_object()

        # If an object is found, change action to ACTION_UPDATE
        if self.object is not None:
            self.action = resource_action.ACTION_UPDATE

        form = self.form_class(instance=self.object)
        context = self.get_context_data(form=form)
        return render(request, self.template_name, context=context)

    def post(self, request, *args, **kwargs):
        self.object = self.get_object()

        # If an object is found, change action to ACTION_UPDATE
        if self.object is not None:
            self.action = resource_action.ACTION_UPDATE

        form = self.form_class(request.POST, instance=self.object)
        if not form.is_valid():
            print(form.errors)
            context = self.get_context_data(form=form)
            return render(request, self.template_name, context=context)

        success, message = self.handle_stripe_product(form)
        if not success:
            messages.error(self.request, message)
            context = self.get_context_data(form=form)
            return render(request, self.template_name, context=context)

        form.save()
        messages.success(self.request, self.get_success_message())
        return redirect(self.success_url)

    def handle_stripe_product(self, form):
        try:
            stripe.api_key = settings.STRIPE_SECRET_KEY

            stripe_product = stripe.Product.create(
                name=form.cleaned_data.get("title"),
                description=form.cleaned_data.get("description"),
            )

            # Save Stripe Product ID to the form instance
            form.instance.product_id = stripe_product.id

            return True, ""  # Success
        except stripe.error.StripeError as e:
            return False, f"Stripe error: {str(e)}"
        except Exception as e:
            return False, f"An error occurred: {str(e)}"


class StripeProductView(LoginRequiredMixin, generic.ListView):
    page_name = resource_action.RESOURCE_MANAGE_SUBSCRIPTIONS
    resource = resource_action.RESOURCE_MANAGE_SUBSCRIPTIONS
    action = resource_action.ACTION_READ
    model = StripeProduct
    template_name = "manage_subscriptions/product_list.html"
    context_object_name = "product_obj"

    def get_queryset(self):
        queryset = super().get_queryset().filter(deleted=False, active=True)
        return queryset.order_by("-created_on")

    def get_context_data(self, **kwargs):
        context = super().get_context_data(**kwargs)
        context["page_name"] = self.page_name
        return context


class StripeProductDeleteView(LoginRequiredMixin, generic.View):
    page_name = resource_action.RESOURCE_MANAGE_SUBSCRIPTIONS
    resource = resource_action.RESOURCE_MANAGE_SUBSCRIPTIONS
    action = resource_action.ACTION_DELETE
    model = StripeProduct
    success_url = reverse_lazy("manage_subscriptions:stripe_product_list")
    success_message = constants.RECORD_DELETED
    error_message = constants.RECORD_NOT_FOUND

    def get(self, request, pk):
        try:
            # Retrieve the subscription object
            product = self.model.objects.get(id=pk)

            # Checking if there is a Stripe Product ID associated with the subscription
            stripe_product_id = product.product_id
            if stripe_product_id:
                stripe.api_key = settings.STRIPE_SECRET_KEY

                try:
                    # Updating the Stripe price to mark it as inactive
                    stripe.Product.modify(stripe_product_id, active=False)
                except stripe.error.StripeError as e:
                    # Handle Stripe errors
                    messages.error(request, f"Stripe error: {str(e)}")
                    return redirect(self.success_url)

            # Updating the subscription model record
            product.deleted = True
            product.active = False
            product.save()

            messages.success(request, self.success_message)

        except self.model.DoesNotExist:
            messages.error(request, self.error_message)

        return redirect(self.success_url)


# class PlanCreateOrUpdateView(LoginRequiredMixin, generic.View):
#     # Set the page_name and resource
#     page_name = resource_action.RESOURCE_MANAGE_SUBSCRIPTIONS
#     resource = resource_action.RESOURCE_MANAGE_SUBSCRIPTIONS

#     # Initialize the action as ACTION_CREATE (can change based on logic)
#     action = resource_action.ACTION_CREATE  # Default action

#     template_name = "manage_subscriptions/plan_add.html"
#     model = Plan
#     form_class = PlanForm
#     success_url = reverse_lazy("manage_subscriptions:plan_list")
#     error_message = "An error occurred while saving the data."

#     # Determine the success message dynamically based on whether it's an update or create
#     def get_success_message(self):
#         self.success_message = (
#             constants.RECORD_CREATED if not self.object else constants.RECORD_UPDATED
#         )
#         return self.success_message

#     # Get the object (if exists) based on URL parameter 'pk'
#     def get_object(self):
#         pk = self.kwargs.get("pk")
#         return get_object_or_404(self.model, pk=pk) if pk else None

#     # Add page_name and operation to the context
#     def get_context_data(self, **kwargs):
#         context = {
#             "page_name": self.page_name,
#             "operation": "Add" if not self.object else "Edit",
#         }
#         context.update(kwargs)  # Include any additional context data passed to the view
#         return context

#     def get(self, request, *args, **kwargs):
#         self.object = self.get_object()

#         # If an object is found, change action to ACTION_UPDATE
#         if self.object is not None:
#             self.action = resource_action.ACTION_UPDATE

#         form = self.form_class(instance=self.object)
#         context = self.get_context_data(form=form)
#         return render(request, self.template_name, context=context)

#     def post(self, request, *args, **kwargs):
#         self.object = self.get_object()

#         # If an object is found, change action to ACTION_UPDATE
#         if self.object is not None:
#             self.action = resource_action.ACTION_UPDATE

#         form = self.form_class(request.POST, instance=self.object)
#         if not form.is_valid():
#             print(form.errors)
#             context = self.get_context_data(form=form)
#             return render(request, self.template_name, context=context)
#         form.save()
#         messages.success(self.request, self.get_success_message())
#         return redirect(self.success_url)


class PlanView(LoginRequiredMixin, generic.ListView):
    page_name = resource_action.RESOURCE_MANAGE_SUBSCRIPTIONS
    resource = resource_action.RESOURCE_MANAGE_SUBSCRIPTIONS
    action = resource_action.ACTION_READ
    model = Plan
    template_name = "manage_subscriptions/plan_list.html"
    context_object_name = "plan_obj"

    def get_queryset(self):
        return super().get_queryset().filter(deleted=False)

    def get_context_data(self, **kwargs):
        context = super().get_context_data(**kwargs)
        context["page_name"] = self.page_name
        return context


# class PlanDeleteView(LoginRequiredMixin, generic.View):
#     page_name = resource_action.RESOURCE_MANAGE_SUBSCRIPTIONS
#     resource = resource_action.RESOURCE_MANAGE_SUBSCRIPTIONS
#     action = resource_action.ACTION_DELETE
#     model = Plan
#     success_url = reverse_lazy("manage_subscriptions:plan_list")
#     success_message = constants.RECORD_DELETED
#     error_message = constants.RECORD_NOT_FOUND

#     def get(self, request, pk):
#         try:
#             type_obj = self.model.objects.get(id=pk)
#             type_obj.deleted = True
#             type_obj.active = False
#             type_obj.save()
#             messages.success(request, self.success_message)
#         except self.model.DoesNotExist:
#             messages.success(request, self.error_message)

#         return redirect(self.success_url)


class PrincipalSubscriptionCreateOrUpdateView(LoginRequiredMixin, generic.View):
    # Set the page_name and resource
    page_name = resource_action.RESOURCE_MANAGE_SUBSCRIPTIONS
    resource = resource_action.RESOURCE_MANAGE_SUBSCRIPTIONS

    # Initialize the action as ACTION_CREATE (can change based on logic)
    action = resource_action.ACTION_CREATE  # Default action

    template_name = "manage_subscriptions/principal_subscription_add.html"
    model = PrincipalSubscription
    form_class = PrincipalSubscriptionForm
    success_url = reverse_lazy("manage_subscriptions:principal_subscriptions_list")
    error_message = "An error occurred while saving the data."

    # Determine the success message dynamically based on whether it's an update or create
    def get_success_message(self):
        self.success_message = (
            constants.RECORD_CREATED if not self.object else constants.RECORD_UPDATED
        )
        return self.success_message

    # Get the object (if exists) based on URL parameter 'pk'
    def get_object(self):
        pk = self.kwargs.get("pk")
        return get_object_or_404(self.model, pk=pk) if pk else None

    # Add page_name and operation to the context
    def get_context_data(self, **kwargs):
        context = {
            "page_name": self.page_name,
            "operation": "Add" if not self.object else "Edit",
        }
        context.update(kwargs)  # Include any additional context data passed to the view
        return context

    def get(self, request, *args, **kwargs):
        self.object = self.get_object()

        # If an object is found, change action to ACTION_UPDATE
        if self.object is not None:
            self.action = resource_action.ACTION_UPDATE

        form = self.form_class(instance=self.object)
        context = self.get_context_data(form=form)
        return render(request, self.template_name, context=context)

    def post(self, request, *args, **kwargs):
        self.object = self.get_object()

        # If an object is found, change action to ACTION_UPDATE
        if self.object is not None:
            self.action = resource_action.ACTION_UPDATE

        form = self.form_class(request.POST, instance=self.object)
        if not form.is_valid():
            print(form.errors)
            context = self.get_context_data(form=form)
            return render(request, self.template_name, context=context)
        form.save()
        messages.success(self.request, self.get_success_message())
        return redirect(self.success_url)


class PrincipalSubscriptionView(LoginRequiredMixin, generic.ListView):
    page_name = resource_action.RESOURCE_PRINCIPAL_SUBSCRIPTIONS
    resource = resource_action.RESOURCE_PRINCIPAL_SUBSCRIPTIONS
    action = resource_action.ACTION_READ
    model = PrincipalSubscription
    template_name = "manage_subscriptions/principal_subscriptions_list.html"
    context_object_name = "principal_subscription_obj"

    def get_queryset(self):
        return super().get_queryset().all()

    def get_context_data(self, **kwargs):
        context = super().get_context_data(**kwargs)
        context["page_name"] = self.page_name
        return context


class PrincipalSubscriptionDeleteView(LoginRequiredMixin, generic.View):
    page_name = resource_action.RESOURCE_MANAGE_SUBSCRIPTIONS
    resource = resource_action.RESOURCE_MANAGE_SUBSCRIPTIONS
    action = resource_action.ACTION_DELETE
    model = PrincipalSubscription
    success_url = reverse_lazy("manage_subscriptions:principal_subscriptions_list")
    success_message = constants.RECORD_DELETED
    error_message = constants.RECORD_NOT_FOUND

    def get(self, request, pk):
        try:
            type_obj = self.model.objects.get(id=pk)
            type_obj.deleted = True
            type_obj.active = False
            type_obj.save()
            messages.success(request, self.success_message)
        except self.model.DoesNotExist:
            messages.success(request, self.error_message)

        return redirect(self.success_url)


class SubscriptionPageView(TemplateView):
    template_name = "stripe_html/index.html"

    def get(self, request, *args, **kwargs):
        # Example of extracting the token from a query parameter or cookie
        token = request.GET.get("token") or request.session.get("jwt")
        print("token: ", token)
        if token:
            request.session["jwt"] = token
            print("request.session: ", request.session)
            try:
                # Decode and validate token
                payload = jwt.decode(token, settings.SECRET_KEY, algorithms=["HS256"])
                print("payload: ", payload)
                try:
                    UserModel = get_user_model()
                    user = UserModel.objects.get(id=payload["user_id"])
                    # Manually specify the authentication backend
                    user.backend = "django.contrib.auth.backends.ModelBackend"
                    # Log the user in
                    login(request, user)
                    print("Logged in user: ", user)

                except IAmPrincipal.DoesNotExist:
                    # Handle expired token
                    return HttpResponseBadRequest("No Principal Found")

            except jwt.ExpiredSignatureError:
                # Handle expired token
                return HttpResponseBadRequest("Expired Signature Error")
            except jwt.InvalidTokenError:
                return HttpResponseBadRequest("Invalid Token Error")

        return super().get(request, *args, **kwargs)

    def get_context_data(self, **kwargs):
        context = super().get_context_data(**kwargs)
        request = self.request
        if request.user.is_authenticated:
            print("request.user: ", request.user)
            subscriptions = Subscription.objects.filter(
                principal_types=request.user.principal_type,
                active=True,
                deleted=False,
                is_free=False,
            )

            if subscriptions.exists():
                context["subscriptions"] = subscriptions
                context["stripeCheckoutUrl"] = settings.STRIPE_CHECKOUT_URL
                context["stripeFinalUrl"] = settings.STRIPE_FINAL_URL
                context["couponValidityCheckUrl"] = settings.COUPON_VALIDITY_CHECK_URL
            else:
                # Handling the case where no subscriptions are found for the principal type.
                context["error"] = "No subscriptions found for your user type."
        return context


@csrf_exempt
def stripe_config(request):
    if request.method == "GET":
        stripe_config = {"publicKey": settings.STRIPE_PUBLISH_KEY}
        return JsonResponse(stripe_config, safe=False)


@csrf_exempt
@require_POST
def validate_coupon(request):
    data = json.loads(request.body)
    coupon_code = data.get("couponCode", None)
    subscription_id = data.get("subscriptionId", None)
    final_amount = None

    try:
        subscription = Subscription.objects.get(id=subscription_id)
    except Subscription.DoesNotExist:
        return JsonResponse({"error": "Subscription not found."}, status=404)

    # If no coupon code is provided, assume no discount and proceed
    if not coupon_code:
        return JsonResponse({"message": "No coupon code provided."}, status=200)

    # Validating Coupon
    try:
        coupon = Coupon.objects.get(coupon_code=coupon_code)

        if not coupon.is_valid():
            return JsonResponse({"error": "Coupon is not valid."}, status=400)

        # Check discount amount
        if coupon.discount_amount and coupon.discount_amount > subscription.amount:
            final_amount = subscription.amount - coupon.discount_amount
            return JsonResponse(
                {"error": "Coupon discount amount exceeds subscription amount."},
                status=400,
            )

        # Check discount percentage
        if coupon.discount_percentage:
            discount = (
                coupon.discount_percentage / Decimal("100")
            ) * subscription.amount
            if discount > subscription.amount:
                return JsonResponse(
                    {
                        "error": "Coupon discount percentage exceeds subscription amount."
                    },
                    status=400,
                )
            final_amount = subscription.amount - discount
        # Retrieving coupon from Stripe if applicable
        if coupon.coupon_id:
            try:
                stripe_coupon = stripe.Coupon.retrieve(coupon.coupon_id)
                print("stripe_coupon: ", stripe_coupon)
                if (
                    stripe_coupon.max_redemptions
                    and stripe_coupon.times_redeemed >= stripe_coupon.max_redemptions
                ):
                    return JsonResponse(
                        {"error": "Coupon max redeems reached."}, status=400
                    )
                return JsonResponse({"data": {"coupon": stripe_coupon, "finalAmount": final_amount}}, status=200)
            except stripe.error.InvalidRequestError:
                return JsonResponse(
                    {"error": f"Invalid coupon code: {coupon_code}"}, status=400
                )
            except stripe.error.StripeError as e:
                return JsonResponse({"error": f"Stripe error: {str(e)}"}, status=400)
        else:
            return JsonResponse(
                {
                    "error": "Coupon is either invalid, expired, or not associated with Stripe."
                },
                status=400,
            )
    except Coupon.DoesNotExist:
        return JsonResponse({"error": "Coupon not found."}, status=404)


@csrf_exempt
@require_POST
def create_checkout_session(request):
    stripe.api_key = settings.STRIPE_SECRET_KEY
    data = json.loads(request.body)
    subscription_id = data.get("subscriptionId")
    coupon_code = data.get("couponCode")
    transaction_amount = data.get("discountAmount")
    principal_id = request.user.id

    try:
        subscription = Subscription.objects.get(id=subscription_id)
    except Subscription.DoesNotExist:
        return JsonResponse({"error": "Subscription not found."}, status=404)

    order_id = f"order_{timezone.localtime().timestamp()}_{request.user.email}"

    # Default transaction amount based on subscription amount
    print("Before Session Data")
    session_data = {
        "payment_method_types": ["card"],
        "success_url": request.build_absolute_uri("/subscriptions/success/"),
        "cancel_url": request.build_absolute_uri("/subscriptions/cancel/"),
        "metadata": {
            "transaction_amount": str(transaction_amount),
            "principal": str(request.user.id),
            "order_id": order_id,
            "subscription_id": str(subscription.id),
            "product_id": str(
                subscription.stripe_product.product_id
                if subscription.stripe_product
                else None
            ),
            "couponCode": coupon_code if coupon_code else None,
        },
    }
    print("session_data: ", session_data)
    # Coupon Handling
    if coupon_code:
        try:
            stripe_coupon = stripe.Coupon.retrieve(coupon_code)
            session_data["discounts"] = [{"coupon": stripe_coupon.id}]
        except stripe.error.InvalidRequestError:
            return JsonResponse(
                {"error": f"Invalid coupon code: {coupon_code}"}, status=400
            )
        except stripe.error.StripeError as e:
            return JsonResponse({"error": f"Stripe error: {str(e)}"}, status=400)

    # Creating the Stripe Checkout Session
    try:
        if subscription.price_id:
            session_data["line_items"] = [
                {
                    "price": subscription.price_id,
                    "quantity": 1,
                }
            ]
            session_data["mode"] = "subscription"
            session_data["subscription_data"] = {
                "metadata": session_data["metadata"],
            }
        else:
            session_data["line_items"] = [
                {
                    "price_data": {
                        "currency": "gbp",
                        "product_data": {
                            "name": subscription.title,
                            "description": subscription.short_description,
                        },
                        "unit_amount": int(subscription.amount * 100),
                    },
                    "quantity": 1,
                }
            ]
            session_data["mode"] = "payment"
        checkout_session = stripe.checkout.Session.create(**session_data)
        return JsonResponse({"sessionId": checkout_session["id"]})
    except Exception as e:
        return JsonResponse({"error": str(e)}, status=500)


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


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