from django.test import TestCase

from scores.models import Score, Version


class BestPerUsernameTests(TestCase):
    @classmethod
    def setUpTestData(cls) -> None:
        cls.version = Version.objects.create(name="default")
        cls.other = Version.objects.create(name="other")

        Score.objects.create(username="legrems", points=120, version=cls.version)
        Score.objects.create(username="Legrems", points=119, version=cls.version)
        Score.objects.create(username="legrems", points=50, version=cls.version)
        Score.objects.create(username="alice", points=200, version=cls.version)
        # Same user, different version: must not collide across versions.
        Score.objects.create(username="legrems", points=999, version=cls.other)

    def _best(self) -> list[Score]:
        return list(Score.objects.filter(version=self.version).best_per_username().with_rank())

    def test_keeps_only_highest_per_case_insensitive_username(self) -> None:
        results = self._best()

        self.assertEqual(len(results), 2)
        by_name = {s.username.lower(): s for s in results}
        self.assertEqual(by_name["legrems"].points, 120)
        self.assertEqual(by_name["alice"].points, 200)

    def test_ranks_recomputed_over_deduplicated_set(self) -> None:
        results = self._best()
        ranks = {s.username.lower(): s.rank for s in results}

        self.assertEqual(ranks["alice"], 1)
        self.assertEqual(ranks["legrems"], 2)

    def test_lower_scores_remain_in_db(self) -> None:
        self.assertEqual(Score.objects.filter(version=self.version).count(), 4)