from django.urls import reverse
from django.utils.html import format_html
from django.utils.translation import gettext as _

from judge.models import Submission
from judge.utils.problems import get_result_data
from judge.utils.raw_sql import join_sql_subquery
from judge.views.submission import ForceContestMixin, ProblemSubmissions

__all__ = ["RankedSubmissions", "ContestRankedSubmission"]


class RankedSubmissions(ProblemSubmissions):
    tab = "best_submissions_list"
    page_type = "best_submissions_list"
    dynamic_update = False

    def get_queryset(self):
        if self.in_contest:
            contest_join = """INNER JOIN judge_contestsubmission AS cs ON (sub.id = cs.submission_id)
                              INNER JOIN judge_contestparticipation AS cp ON (cs.participation_id = cp.id)"""
            points = "cs.points"
            constraint = "AND cp.contest_id = %s"
        else:
            contest_join = ""
            points = "sub.points"
            constraint = ""
        queryset = (
            super(RankedSubmissions, self)
            ._get_queryset()
            .filter(user__is_unlisted=False)
        )
        join_sql_subquery(
            queryset,
            subquery="""
                SELECT sub.id AS id
                FROM (
                    SELECT sub.user_id AS uid, MAX(sub.points) AS points
                    FROM judge_submission AS sub {contest_join}
                    WHERE sub.problem_id = %s AND {points} > 0 {constraint}
                    GROUP BY sub.user_id
                ) AS highscore STRAIGHT_JOIN (
                    SELECT sub.user_id AS uid, sub.points, MIN(sub.time) as time
                    FROM judge_submission AS sub {contest_join}
                    WHERE sub.problem_id = %s AND {points} > 0 {constraint}
                    GROUP BY sub.user_id, {points}
                ) AS fastest ON (highscore.uid = fastest.uid AND highscore.points = fastest.points)
                    STRAIGHT_JOIN judge_submission AS sub
                        ON (sub.user_id = fastest.uid AND sub.time = fastest.time) {contest_join}
                WHERE sub.problem_id = %s AND {points} > 0 {constraint}
                GROUP BY sub.user_id
            """.format(
                points=points, contest_join=contest_join, constraint=constraint
            ),
            params=[self.problem.id, self.contest.id] * 3
            if self.in_contest
            else [self.problem.id] * 3,
            alias="best_subs",
            join_fields=[("id", "id")],
            related_model=Submission,
        )

        if self.in_contest:
            return queryset.order_by("-contest__points", "time")
        else:
            return queryset.order_by("-points", "time")

    def get_title(self):
        return _("Best solutions for %s") % self.problem_name

    def get_content_title(self):
        return format_html(
            _('Best solutions for <a href="{1}">{0}</a>'),
            self.problem_name,
            reverse("problem_detail", args=[self.problem.code]),
        )

    def _get_result_data(self):
        return get_result_data(
            super(RankedSubmissions, self)._get_queryset().order_by()
        )


class ContestRankedSubmission(ForceContestMixin, RankedSubmissions):
    def get_title(self):
        if self.problem.is_accessible_by(self.request.user):
            return _("Best solutions for %(problem)s in %(contest)s") % {
                "problem": self.problem_name,
                "contest": self.contest.name,
            }
        return _("Best solutions for problem %(number)s in %(contest)s") % {
            "number": self.get_problem_number(self.problem),
            "contest": self.contest.name,
        }

    def get_content_title(self):
        if self.problem.is_accessible_by(self.request.user):
            return format_html(
                _('Best solutions for <a href="{1}">{0}</a> in <a href="{3}">{2}</a>'),
                self.problem_name,
                reverse("problem_detail", args=[self.problem.code]),
                self.contest.name,
                reverse("contest_view", args=[self.contest.key]),
            )
        return format_html(
            _('Best solutions for problem {0} in <a href="{2}">{1}</a>'),
            self.get_problem_number(self.problem),
            self.contest.name,
            reverse("contest_view", args=[self.contest.key]),
        )

    def _get_result_data(self):
        return get_result_data(
            Submission.objects.filter(
                problem_id=self.problem.id,
                contest__participation__contest_id=self.contest.id,
            )
        )
