from datetime import timedelta

from django.core.exceptions import ValidationError
from django.db.models import Max
from django.template.defaultfilters import floatformat
from django.urls import reverse
from django.utils.html import format_html
from django.utils.safestring import mark_safe
from django.utils.translation import gettext_lazy

from judge.contest_format.base import BaseContestFormat
from judge.contest_format.registry import register_contest_format
from judge.utils.timedelta import nice_repr


@register_contest_format("default")
class DefaultContestFormat(BaseContestFormat):
    name = gettext_lazy("Default")

    @classmethod
    def validate(cls, config):
        if config is not None and (not isinstance(config, dict) or config):
            raise ValidationError(
                "default contest expects no config or empty dict as config"
            )

    def __init__(self, contest, config):
        super(DefaultContestFormat, self).__init__(contest, config)

    def update_participation(self, participation):
        cumtime = 0
        points = 0
        format_data = {}

        for result in participation.submissions.values("problem_id").annotate(
            time=Max("submission__date"),
            points=Max("points"),
        ):
            dt = (result["time"] - participation.start).total_seconds()
            if result["points"]:
                cumtime += dt
            format_data[str(result["problem_id"])] = {
                "time": dt,
                "points": result["points"],
            }
            points += result["points"]

        participation.cumtime = max(cumtime, 0)
        participation.score = points
        participation.tiebreaker = 0
        participation.format_data = format_data
        participation.save()

    def display_user_problem(self, participation, contest_problem):
        format_data = (participation.format_data or {}).get(str(contest_problem.id))
        if format_data:
            return format_html(
                '<td class="{state} problem-score-col"><a data-featherlight="{url}" href="#">{points}<div class="solving-time">{time}</div></a></td>',
                state=(
                    (
                        "pretest-"
                        if self.contest.run_pretests_only
                        and contest_problem.is_pretested
                        else ""
                    )
                    + self.best_solution_state(
                        format_data["points"], contest_problem.points
                    )
                ),
                url=reverse(
                    "contest_user_submissions_ajax",
                    args=[
                        self.contest.key,
                        participation.user.user.username,
                        contest_problem.problem.code,
                    ],
                ),
                points=floatformat(
                    format_data["points"], -self.contest.points_precision
                ),
                time=nice_repr(timedelta(seconds=format_data["time"]), "noday"),
            )
        else:
            return mark_safe('<td class="problem-score-col"></td>')

    def display_participation_result(self, participation):
        return format_html(
            '<td class="user-points">{points}<div class="solving-time">{cumtime}</div></td>',
            points=floatformat(participation.score, -self.contest.points_precision),
            cumtime=nice_repr(timedelta(seconds=participation.cumtime), "noday"),
        )

    def get_problem_breakdown(self, participation, contest_problems):
        return [
            (participation.format_data or {}).get(str(contest_problem.id))
            for contest_problem in contest_problems
        ]

    def get_contest_problem_label_script(self):
        return """
            function(n)
                return tostring(math.floor(n + 1))
            end
        """