import logging

from django.shortcuts import render, redirect
from django.urls import reverse
from django.db import IntegrityError

from lib.anonymize_ip import anonymize_ip

from .models import Signup


logger = logging.getLogger(__name__)


def index(request):
    if request.method == "POST":
        x_forwarded_for = request.META.get('HTTP_X_FORWARDED_FOR')
        if x_forwarded_for:
            ip = x_forwarded_for.split(',')[0]
        else:
            ip = request.META.get('REMOTE_ADDR')
        anonymous_ip = anonymize_ip(ip)

        e = Signup(
          email = request.POST.get("email"),
          anonymized_ip = anonymous_ip,
          user_agent = request.META["HTTP_USER_AGENT"],
        )

        try:
            e.clean_fields()
        except ValidationError as e:
            return e.render(request, "signup/index.html",
                            {"error_message": e.message})

        logging.info("registering email={}".format(request.POST.get("email")))
        try:
            e.save()
        except IntegrityError:
            # email already registered, presumably
            return redirect(reverse("index") + "?already_subscribed")
        except DatabaseError:
            logger.exception("database error when registering an email")
            err =  "Sorry, database error. Please come back later."
            return render(request, "signup/index.html",
                          {"error_message": err})
        return redirect(reverse("index") + "?success")

    return render(request, "signup/index.html", {})