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'
    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')],
        )

        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))