import requests
from django.conf import settings
from django.contrib.auth.decorators import login_required
from django.core.exceptions import ImproperlyConfigured
from django.http import (
    Http404,
    HttpResponse,
    HttpResponseBadRequest,
    HttpResponseForbidden,
    HttpResponseRedirect,
)
from django.utils.translation import gettext as _
from django.views.generic import View

from judge.models import Submission

__all__ = ["rejudge_submission", "DetectTimezone"]


@login_required
def rejudge_submission(request):
    if (
        request.method != "POST"
        or not request.user.has_perm("judge.rejudge_submission")
        or not request.user.has_perm("judge.edit_own_problem")
    ):
        return HttpResponseForbidden()

    if "id" not in request.POST or not request.POST["id"].isdigit():
        return HttpResponseBadRequest()

    try:
        submission = Submission.objects.get(id=request.POST["id"])
    except Submission.DoesNotExist:
        return HttpResponseBadRequest()

    if not request.user.has_perm(
        "judge.edit_all_problem"
    ) and not submission.problem.is_editor(request.profile):
        return HttpResponseForbidden()

    submission.judge(rejudge=True)

    redirect = request.POST.get("path", None)

    return (
        HttpResponseRedirect(redirect)
        if redirect
        else HttpResponse("success", content_type="text/plain")
    )


class DetectTimezone(View):
    def askgeo(self, lat, long):
        if not hasattr(settings, "ASKGEO_ACCOUNT_ID") or not hasattr(
            settings, "ASKGEO_ACCOUNT_API_KEY"
        ):
            raise ImproperlyConfigured()
        data = requests.get(
            "http://api.askgeo.com/v1/%s/%s/query.json?databases=TimeZone&points=%f,%f"
            % (settings.ASKGEO_ACCOUNT_ID, settings.ASKGEO_ACCOUNT_API_KEY, lat, long)
        ).json()
        try:
            return HttpResponse(
                data["data"][0]["TimeZone"]["TimeZoneId"], content_type="text/plain"
            )
        except (IndexError, KeyError):
            return HttpResponse(
                _("Invalid upstream data: %s") % data,
                content_type="text/plain",
                status=500,
            )

    def geonames(self, lat, long):
        if not hasattr(settings, "GEONAMES_USERNAME"):
            raise ImproperlyConfigured()
        data = requests.get(
            "http://api.geonames.org/timezoneJSON?lat=%f&lng=%f&username=%s"
            % (lat, long, settings.GEONAMES_USERNAME)
        ).json()
        try:
            return HttpResponse(data["timezoneId"], content_type="text/plain")
        except KeyError:
            return HttpResponse(
                _("Invalid upstream data: %s") % data,
                content_type="text/plain",
                status=500,
            )

    def default(self, lat, long):
        raise Http404()

    def get(self, request, *args, **kwargs):
        backend = settings.TIMEZONE_DETECT_BACKEND
        try:
            lat, long = float(request.GET["lat"]), float(request.GET["long"])
        except (ValueError, KeyError):
            return HttpResponse(
                _("Bad latitude or longitude"), content_type="text/plain", status=404
            )
        return {"askgeo": self.askgeo, "geonames": self.geonames,}.get(
            backend, self.default
        )(lat, long)