from django.db.models import F, Q
from django.http import Http404, JsonResponse
from django.shortcuts import get_object_or_404
from django.utils.encoding import smart_text
from django.views.generic.list import BaseListView

from chat_box.utils import encrypt_url

from judge.jinja2.gravatar import gravatar
from judge.models import Comment, Contest, Organization, Problem, Profile


def _get_user_queryset(term):
    qs = Profile.objects
    if term.endswith(" "):
        qs = qs.filter(user__username=term.strip())
    else:
        qs = qs.filter(user__username__icontains=term)
    return qs


class Select2View(BaseListView):
    paginate_by = 20

    def get(self, request, *args, **kwargs):
        self.request = request
        self.term = kwargs.get("term", request.GET.get("term", ""))
        self.object_list = self.get_queryset()
        context = self.get_context_data()

        return JsonResponse(
            {
                "results": [
                    {
                        "text": smart_text(self.get_name(obj)),
                        "id": obj.pk,
                    }
                    for obj in context["object_list"]
                ],
                "more": context["page_obj"].has_next(),
            }
        )

    def get_name(self, obj):
        return str(obj)


class UserSelect2View(Select2View):
    def get_queryset(self):
        return (
            _get_user_queryset(self.term)
            .annotate(username=F("user__username"))
            .only("id")
        )

    def get_name(self, obj):
        return obj.username


class OrganizationSelect2View(Select2View):
    def get_queryset(self):
        return Organization.objects.filter(name__icontains=self.term)


class ProblemSelect2View(Select2View):
    def get_queryset(self):
        return (
            Problem.get_visible_problems(self.request.user)
            .filter(Q(code__icontains=self.term) | Q(name__icontains=self.term))
            .distinct()
        )


class ContestSelect2View(Select2View):
    def get_queryset(self):
        return Contest.get_visible_contests(self.request.user).filter(
            Q(key__icontains=self.term) | Q(name__icontains=self.term)
        )


class CommentSelect2View(Select2View):
    def get_queryset(self):
        return Comment.objects.filter(page__icontains=self.term)


class UserSearchSelect2View(BaseListView):
    paginate_by = 20

    def get_queryset(self):
        return _get_user_queryset(self.term)

    def get(self, request, *args, **kwargs):
        self.request = request
        self.kwargs = kwargs
        self.term = kwargs.get("term", request.GET.get("term", ""))
        self.gravatar_size = request.GET.get("gravatar_size", 128)
        self.gravatar_default = request.GET.get("gravatar_default", None)

        self.object_list = self.get_queryset().values_list(
            "pk", "user__username", "user__email", "display_rank"
        )

        context = self.get_context_data()

        return JsonResponse(
            {
                "results": [
                    {
                        "text": username,
                        "id": username,
                        "gravatar_url": gravatar(
                            email, self.gravatar_size, self.gravatar_default
                        ),
                        "display_rank": display_rank,
                    }
                    for pk, username, email, display_rank in context["object_list"]
                ],
                "more": context["page_obj"].has_next(),
            }
        )

    def get_name(self, obj):
        return str(obj)


class ContestUserSearchSelect2View(UserSearchSelect2View):
    def get_queryset(self):
        contest = get_object_or_404(Contest, key=self.kwargs["contest"])
        if not contest.is_accessible_by(
            self.request.user
        ) or not contest.can_see_full_scoreboard(self.request.user):
            raise Http404()

        return Profile.objects.filter(
            contest_history__contest=contest, user__username__icontains=self.term
        ).distinct()


class TicketUserSelect2View(UserSearchSelect2View):
    def get_queryset(self):
        return Profile.objects.filter(
            tickets__isnull=False, user__username__icontains=self.term
        ).distinct()


class AssigneeSelect2View(UserSearchSelect2View):
    def get_queryset(self):
        return Profile.objects.filter(
            assigned_tickets__isnull=False, user__username__icontains=self.term
        ).distinct()


class ChatUserSearchSelect2View(BaseListView):
    paginate_by = 20

    def get_queryset(self):  # TODO: add block
        return _get_user_queryset(self.term)

    def get(self, request, *args, **kwargs):
        self.request = request
        self.kwargs = kwargs
        self.term = kwargs.get("term", request.GET.get("term", ""))
        self.gravatar_size = request.GET.get("gravatar_size", 128)
        self.gravatar_default = request.GET.get("gravatar_default", None)

        self.object_list = self.get_queryset().values_list(
            "pk", "user__username", "user__email", "display_rank"
        )

        context = self.get_context_data()

        return JsonResponse(
            {
                "results": [
                    {
                        "text": username,
                        "id": encrypt_url(request.profile.id, pk),
                        "gravatar_url": gravatar(
                            email, self.gravatar_size, self.gravatar_default
                        ),
                        "display_rank": display_rank,
                    }
                    for pk, username, email, display_rank in context["object_list"]
                ],
                "more": context["page_obj"].has_next(),
            }
        )

    def get_name(self, obj):
        return str(obj)