from django.urls import reverse
from django.views.decorators.csrf import csrf_exempt
from django.shortcuts import render, get_object_or_404, redirect
from django.http.response import HttpResponse

from tpv.forms import UpdateEmailForm
from tpv.models import PaymentTransaction
from tpv.redsys import RedsysClient
from tpv.utils import pay_transaction, validate_payment_for_transaction
from tpv.signals import redsys_payment_accepted, redsys_payment_rejected


def payment_accepted(request, transaction):
    transaction = get_object_or_404(PaymentTransaction, hash=transaction)

    return render(
        request,
        template_name="tpv/order_created.html",
        context={
            "order": transaction,
        },
    )


def payment_rejected(request, transaction):
    transaction = get_object_or_404(PaymentTransaction, hash=transaction)

    return render(
        request,
        template_name="tpv/order_created.html",
        context={
            "order": transaction,
        },
    )


@csrf_exempt
def webhook(request, transaction):
    transaction = get_object_or_404(PaymentTransaction, hash=transaction)

    try:
        amount_paid = validate_payment_for_transaction(request, transaction)
        pay_transaction(transaction, amount_paid)
        redsys_payment_accepted.send_robust(
            PaymentTransaction.__class__, hash=transaction.hash
        )

        return HttpResponse(status=200)
    except Exception as e:
        transaction.status = PaymentTransaction.StatusChoices.ERROR
        transaction.observations = str(e)
        transaction.save()
        redsys_payment_rejected.send_robust(
            PaymentTransaction.__class__, hash=transaction.hash
        )

        return HttpResponse(status=409)


def transaction_created(request, transaction):
    transaction = get_object_or_404(PaymentTransaction, hash=transaction)

    client = RedsysClient()
    parameters = client.get_body_for_transaction(transaction)

    return render(
        request,
        template_name="tpv/order_created.html",
        context={
            "form": UpdateEmailForm({"contact_email": transaction.contact_email}),
            "action": reverse(
                "tpv:order_created", kwargs={"transaction": transaction.hash}
            ),
            "order": transaction,
            "signature_version": parameters.get("Ds_SignatureVersion"),
            "merchant_parameters": parameters.get("Ds_MerchantParameters"),
            "signature": parameters.get("Ds_Signature"),
            "redsys_target_url": client.get_target_url(),
        },
    )