import braintree
from django.contrib.auth.decorators import login_required
from django.contrib import messages
from django.http import HttpResponseForbidden, JsonResponse
from django.shortcuts import redirect, render
from django.views.decorators.http import require_POST

from hc.accounts.models import Profile
from .models import Subscription


@login_required
def get_client_token(request):
    sub = Subscription.objects.get(user=request.user)
    client_token = braintree.ClientToken.generate({
        "customer_id": sub.customer_id
    })

    return JsonResponse({"client_token": client_token})


def pricing(request):
    sub = None
    if request.user.is_authenticated():
        try:
            sub = Subscription.objects.get(user=request.user)
        except Subscription.DoesNotExist:
            sub = Subscription(user=request.user)
            sub.save()

    first_charge = False
    if "first_charge" in request.session:
        first_charge = True
        del request.session["first_charge"]

    ctx = {
        "page": "pricing",
        "sub": sub,
        "first_charge": first_charge
    }

    return render(request, "payments/pricing.html", ctx)


def log_and_bail(request, result):
    for error in result.errors.deep_errors:
        messages.error(request, error.message)
    else:
        messages.error(request, result.message)

    return redirect("hc-pricing")


@login_required
@require_POST
def create_plan(request):
    plan_id = request.POST["plan_id"]
    assert plan_id in ("P5", "P20")

    sub = Subscription.objects.get(user=request.user)

    # Cancel the previous plan
    if sub.subscription_id:
        braintree.Subscription.cancel(sub.subscription_id)
        sub.subscription_id = ""
        sub.plan_id = ""
        sub.save()

    # Create Braintree customer record
    if not sub.customer_id:
        result = braintree.Customer.create({
            "email": request.user.email
        })
        if not result.is_success:
            return log_and_bail(request, result)

        sub.customer_id = result.customer.id
        sub.save()

    # Create Braintree payment method
    if "payment_method_nonce" in request.POST:
        result = braintree.PaymentMethod.create({
            "customer_id": sub.customer_id,
            "payment_method_nonce": request.POST["payment_method_nonce"]
        })

        if not result.is_success:
            return log_and_bail(request, result)

        sub.payment_method_token = result.payment_method.token
        sub.save()

    # Create Braintree subscription
    result = braintree.Subscription.create({
        "payment_method_token": sub.payment_method_token,
        "plan_id": plan_id,
    })

    if not result.is_success:
        return log_and_bail(request, result)

    sub.subscription_id = result.subscription.id
    sub.plan_id = plan_id
    sub.save()

    # Update user's profile
    profile = Profile.objects.for_user(request.user)
    if plan_id == "P5":
        profile.ping_log_limit = 1000
        profile.save()
    elif plan_id == "P20":
        profile.ping_log_limit = 10000
        profile.save()

    request.session["first_charge"] = True
    return redirect("hc-pricing")


@login_required
@require_POST
def cancel_plan(request):
    sub = Subscription.objects.get(user=request.user)

    braintree.Subscription.cancel(sub.subscription_id)
    sub.subscription_id = ""
    sub.plan_id = ""
    sub.save()

    return redirect("hc-pricing")


@login_required
def billing(request):
    sub = Subscription.objects.get(user=request.user)

    transactions = braintree.Transaction.search(braintree.TransactionSearch.customer_id == sub.customer_id)
    ctx = {"transactions": transactions}

    return render(request, "payments/billing.html", ctx)


@login_required
def invoice(request, transaction_id):
    sub = Subscription.objects.get(user=request.user)
    transaction = braintree.Transaction.find(transaction_id)
    if transaction.customer_details.id != sub.customer_id:
        return HttpResponseForbidden()

    ctx = {"tx": transaction}
    return render(request, "payments/invoice.html", ctx)