from datetime import timedelta

from django.contrib.auth import get_user_model
from django.test import TestCase
from django.urls import reverse
from django.utils import timezone

from fupogfakta.models import (
    Category,
    GameSession,
    LieAnswer,
    Player,
    Question,
    RoundConfig,
    RoundQuestion,
)

User = get_user_model()


class LobbyFlowTests(TestCase):
    def setUp(self):
        self.host = User.objects.create_user(username="host", password="secret123")

    def test_create_session_requires_login(self):
        response = self.client.post(reverse("lobby:create_session"))

        self.assertEqual(response.status_code, 302)
        self.assertEqual(GameSession.objects.count(), 0)

    def test_host_can_create_session(self):
        self.client.login(username="host", password="secret123")

        response = self.client.post(reverse("lobby:create_session"))

        self.assertEqual(response.status_code, 201)
        body = response.json()
        self.assertEqual(body["session"]["status"], GameSession.Status.LOBBY)
        self.assertEqual(len(body["session"]["code"]), 6)

        session = GameSession.objects.get(code=body["session"]["code"])
        self.assertEqual(session.host, self.host)

    def test_player_can_join_with_code(self):
        session = GameSession.objects.create(host=self.host, code="ABCD23")

        response = self.client.post(
            reverse("lobby:join_session"),
            data={"code": "abcd23", "nickname": "Luna"},
            content_type="application/json",
        )

        self.assertEqual(response.status_code, 201)
        body = response.json()
        self.assertEqual(body["session"]["code"], "ABCD23")
        self.assertEqual(body["player"]["nickname"], "Luna")
        self.assertTrue(Player.objects.filter(session=session, nickname="Luna").exists())

    def test_join_rejects_duplicate_nickname_case_insensitive(self):
        session = GameSession.objects.create(host=self.host, code="QWER12")
        Player.objects.create(session=session, nickname="Luna")

        response = self.client.post(
            reverse("lobby:join_session"),
            data={"code": "QWER12", "nickname": "lUna"},
            content_type="application/json",
        )

        self.assertEqual(response.status_code, 409)
        self.assertEqual(response.json()["error"], "Nickname already taken")

    def test_join_rejects_non_joinable_session(self):
        GameSession.objects.create(host=self.host, code="ZXCV98", status=GameSession.Status.FINISHED)

        response = self.client.post(
            reverse("lobby:join_session"),
            data={"code": "ZXCV98", "nickname": "Kai"},
            content_type="application/json",
        )

        self.assertEqual(response.status_code, 400)
        self.assertEqual(response.json()["error"], "Session is not joinable")

    def test_session_detail_returns_players(self):
        session = GameSession.objects.create(host=self.host, code="LMNO45")
        Player.objects.create(session=session, nickname="Mia", score=7)
        Player.objects.create(session=session, nickname="Bo", score=2)

        response = self.client.get(reverse("lobby:session_detail", kwargs={"code": "lmno45"}))

        self.assertEqual(response.status_code, 200)
        payload = response.json()
        self.assertEqual(payload["session"]["players_count"], 2)
        self.assertEqual([p["nickname"] for p in payload["players"]], ["Bo", "Mia"])


class StartRoundTests(TestCase):
    def setUp(self):
        self.host = User.objects.create_user(username="host", password="secret123")
        self.other_user = User.objects.create_user(username="other", password="secret123")
        self.session = GameSession.objects.create(host=self.host, code="ABCD23")
        self.category = Category.objects.create(name="Historie", slug="historie", is_active=True)
        Question.objects.create(
            category=self.category,
            prompt="Hvilket år faldt muren?",
            correct_answer="1989",
            is_active=True,
        )

    def test_host_can_start_round_with_selected_category(self):
        self.client.login(username="host", password="secret123")

        response = self.client.post(
            reverse("lobby:start_round", kwargs={"code": self.session.code}),
            data={"category_slug": self.category.slug},
            content_type="application/json",
        )

        self.assertEqual(response.status_code, 201)
        body = response.json()
        self.assertEqual(body["session"]["status"], GameSession.Status.LIE)
        self.assertEqual(body["round"]["number"], 1)
        self.assertEqual(body["round"]["category"]["slug"], self.category.slug)

        self.session.refresh_from_db()
        self.assertEqual(self.session.status, GameSession.Status.LIE)
        round_config = RoundConfig.objects.get(session=self.session, number=1)
        self.assertEqual(round_config.category, self.category)

    def test_start_round_requires_host(self):
        self.client.login(username="other", password="secret123")

        response = self.client.post(
            reverse("lobby:start_round", kwargs={"code": self.session.code}),
            data={"category_slug": self.category.slug},
            content_type="application/json",
        )

        self.assertEqual(response.status_code, 403)
        self.assertEqual(response.json()["error"], "Only host can start round")

    def test_start_round_requires_existing_active_category_with_questions(self):
        self.client.login(username="host", password="secret123")

        response = self.client.post(
            reverse("lobby:start_round", kwargs={"code": self.session.code}),
            data={"category_slug": "ukendt"},
            content_type="application/json",
        )
        self.assertEqual(response.status_code, 404)

        empty_category = Category.objects.create(name="Sport", slug="sport", is_active=True)
        response = self.client.post(
            reverse("lobby:start_round", kwargs={"code": self.session.code}),
            data={"category_slug": empty_category.slug},
            content_type="application/json",
        )
        self.assertEqual(response.status_code, 400)
        self.assertEqual(response.json()["error"], "Category has no active questions")

    def test_start_round_rejects_non_lobby_session(self):
        self.client.login(username="host", password="secret123")
        self.session.status = GameSession.Status.GUESS
        self.session.save(update_fields=["status"])

        response = self.client.post(
            reverse("lobby:start_round", kwargs={"code": self.session.code}),
            data={"category_slug": self.category.slug},
            content_type="application/json",
        )

        self.assertEqual(response.status_code, 400)
        self.assertEqual(response.json()["error"], "Round can only be started from lobby")


class LieSubmissionTests(TestCase):
    def setUp(self):
        self.host = User.objects.create_user(username="host", password="secret123")
        self.session = GameSession.objects.create(host=self.host, code="ABCD23", status=GameSession.Status.LIE)
        self.category = Category.objects.create(name="Geografi", slug="geografi", is_active=True)
        self.question = Question.objects.create(
            category=self.category,
            prompt="Hvad er hovedstaden i Australien?",
            correct_answer="Canberra",
            is_active=True,
        )
        RoundConfig.objects.create(
            session=self.session,
            number=1,
            category=self.category,
            lie_seconds=45,
        )
        self.player = Player.objects.create(session=self.session, nickname="Luna")

    def test_host_can_show_question_and_get_lie_deadline(self):
        self.client.login(username="host", password="secret123")

        response = self.client.post(reverse("lobby:show_question", kwargs={"code": self.session.code}))

        self.assertEqual(response.status_code, 201)
        payload = response.json()
        self.assertEqual(payload["config"]["lie_seconds"], 45)
        self.assertIn("lie_deadline_at", payload["round_question"])
        self.assertTrue(RoundQuestion.objects.filter(session=self.session, round_number=1).exists())

    def test_player_can_submit_lie_before_deadline(self):
        round_question = RoundQuestion.objects.create(
            session=self.session,
            round_number=1,
            question=self.question,
            correct_answer=self.question.correct_answer,
        )

        response = self.client.post(
            reverse(
                "lobby:submit_lie",
                kwargs={"code": self.session.code, "round_question_id": round_question.id},
            ),
            data={"player_id": self.player.id, "text": "Sydney"},
            content_type="application/json",
        )

        self.assertEqual(response.status_code, 201)
        self.assertTrue(LieAnswer.objects.filter(round_question=round_question, player=self.player).exists())

    def test_submit_lie_rejects_after_time_window(self):
        round_question = RoundQuestion.objects.create(
            session=self.session,
            round_number=1,
            question=self.question,
            correct_answer=self.question.correct_answer,
        )
        round_question.shown_at = timezone.now() - timedelta(seconds=46)
        round_question.save(update_fields=["shown_at"])

        response = self.client.post(
            reverse(
                "lobby:submit_lie",
                kwargs={"code": self.session.code, "round_question_id": round_question.id},
            ),
            data={"player_id": self.player.id, "text": "Melbourne"},
            content_type="application/json",
        )

        self.assertEqual(response.status_code, 400)
        self.assertEqual(response.json()["error"], "Lie submission window has closed")

    def test_submit_lie_rejects_duplicate_submission(self):
        round_question = RoundQuestion.objects.create(
            session=self.session,
            round_number=1,
            question=self.question,
            correct_answer=self.question.correct_answer,
        )
        LieAnswer.objects.create(round_question=round_question, player=self.player, text="Perth")

        response = self.client.post(
            reverse(
                "lobby:submit_lie",
                kwargs={"code": self.session.code, "round_question_id": round_question.id},
            ),
            data={"player_id": self.player.id, "text": "Brisbane"},
            content_type="application/json",
        )

        self.assertEqual(response.status_code, 409)
        self.assertEqual(response.json()["error"], "Lie already submitted for this player")

class MixAnswersTests(TestCase):
    def setUp(self):
        self.host = User.objects.create_user(username="host", password="secret123")
        self.other_user = User.objects.create_user(username="other", password="secret123")
        self.session = GameSession.objects.create(host=self.host, code="ABCD23", status=GameSession.Status.LIE)
        self.category = Category.objects.create(name="Historie", slug="historie", is_active=True)
        self.question = Question.objects.create(
            category=self.category,
            prompt="Hvilken by er Danmarks hovedstad?",
            correct_answer="København",
            is_active=True,
        )
        RoundConfig.objects.create(session=self.session, number=1, category=self.category)
        self.round_question = RoundQuestion.objects.create(
            session=self.session,
            round_number=1,
            question=self.question,
            correct_answer="København",
        )
        self.player_one = Player.objects.create(session=self.session, nickname="Luna")
        self.player_two = Player.objects.create(session=self.session, nickname="Mads")

    def test_host_can_mix_answers_and_transition_to_guess(self):
        LieAnswer.objects.create(round_question=self.round_question, player=self.player_one, text="Aarhus")
        LieAnswer.objects.create(round_question=self.round_question, player=self.player_two, text="Odense")

        self.client.login(username="host", password="secret123")
        response = self.client.post(
            reverse(
                "lobby:mix_answers",
                kwargs={"code": self.session.code, "round_question_id": self.round_question.id},
            )
        )

        self.assertEqual(response.status_code, 200)
        payload = response.json()
        answer_texts = [entry["text"] for entry in payload["answers"]]
        self.assertEqual(set(answer_texts), {"København", "Aarhus", "Odense"})
        self.assertEqual(payload["session"]["status"], GameSession.Status.GUESS)

        self.session.refresh_from_db()
        self.assertEqual(self.session.status, GameSession.Status.GUESS)

    def test_mix_answers_requires_host(self):
        self.client.login(username="other", password="secret123")

        response = self.client.post(
            reverse(
                "lobby:mix_answers",
                kwargs={"code": self.session.code, "round_question_id": self.round_question.id},
            )
        )

        self.assertEqual(response.status_code, 403)
        self.assertEqual(response.json()["error"], "Only host can mix answers")

    def test_mix_answers_deduplicates_case_insensitive_lies(self):
        LieAnswer.objects.create(round_question=self.round_question, player=self.player_one, text="københavn")
        LieAnswer.objects.create(round_question=self.round_question, player=self.player_two, text="Aarhus")

        self.client.login(username="host", password="secret123")
        response = self.client.post(
            reverse(
                "lobby:mix_answers",
                kwargs={"code": self.session.code, "round_question_id": self.round_question.id},
            )
        )

        self.assertEqual(response.status_code, 200)
        answer_texts = [entry["text"] for entry in response.json()["answers"]]
        self.assertEqual(set(answer_texts), {"København", "Aarhus"})