from __future__ import annotations

import unittest

from sqlalchemy import create_engine
from sqlalchemy.orm import Session, sessionmaker

from govoplan_core.db.base import Base
from govoplan_poll.backend.db.models import Poll, PollOption, PollResponse
from govoplan_poll.backend.schemas import PollAnswerInput, PollCreateRequest, PollOptionInput, PollSubmitResponseRequest
from govoplan_poll.backend.service import PollError, create_poll, open_poll, poll_result_summary_by_id, submit_poll_response


class PollServiceTests(unittest.TestCase):
    def setUp(self) -> None:
        self.engine = create_engine("sqlite:///:memory:")
        Base.metadata.create_all(self.engine, tables=[Poll.__table__, PollOption.__table__, PollResponse.__table__])
        self.Session = sessionmaker(bind=self.engine)
        self.session: Session = self.Session()

    def tearDown(self) -> None:
        self.session.close()
        Base.metadata.drop_all(self.engine, tables=[PollResponse.__table__, PollOption.__table__, Poll.__table__])
        self.engine.dispose()

    def test_single_choice_response_can_update_existing_respondent(self) -> None:
        poll = create_poll(
            self.session,
            tenant_id="tenant-1",
            user_id="user-1",
            payload=PollCreateRequest(
                title="Lunch",
                kind="single_choice",
                options=[PollOptionInput(key="a", label="A"), PollOptionInput(key="b", label="B")],
            ),
        )
        open_poll(self.session, tenant_id="tenant-1", poll_id=poll.id)

        first = submit_poll_response(
            self.session,
            tenant_id="tenant-1",
            poll_id=poll.id,
            payload=PollSubmitResponseRequest(respondent_id="person-1", answers=[PollAnswerInput(option_key="a")]),
        )
        second = submit_poll_response(
            self.session,
            tenant_id="tenant-1",
            poll_id=poll.id,
            payload=PollSubmitResponseRequest(respondent_id="person-1", answers=[PollAnswerInput(option_key="b")]),
        )
        summary = poll_result_summary_by_id(self.session, tenant_id="tenant-1", poll_id=poll.id)

        self.assertEqual(first.id, second.id)
        self.assertEqual(summary["response_count"], 1)
        self.assertEqual(summary["leading_option_ids"], [second.answers[0]["option_id"]])

    def test_anonymous_response_requires_poll_policy(self) -> None:
        poll = create_poll(
            self.session,
            tenant_id="tenant-1",
            user_id=None,
            payload=PollCreateRequest(
                title="Decision",
                kind="yes_no",
            ),
        )
        open_poll(self.session, tenant_id="tenant-1", poll_id=poll.id)

        with self.assertRaisesRegex(PollError, "Anonymous responses are not allowed"):
            submit_poll_response(
                self.session,
                tenant_id="tenant-1",
                poll_id=poll.id,
                payload=PollSubmitResponseRequest(answers=[PollAnswerInput(option_key="yes")]),
            )

    def test_ranked_choice_summary_uses_borda_score(self) -> None:
        poll = create_poll(
            self.session,
            tenant_id="tenant-1",
            user_id="user-1",
            payload=PollCreateRequest(
                title="Priority",
                kind="ranked_choice",
                options=[
                    PollOptionInput(key="alpha", label="Alpha"),
                    PollOptionInput(key="beta", label="Beta"),
                    PollOptionInput(key="gamma", label="Gamma"),
                ],
            ),
        )
        open_poll(self.session, tenant_id="tenant-1", poll_id=poll.id)

        submit_poll_response(
            self.session,
            tenant_id="tenant-1",
            poll_id=poll.id,
            payload=PollSubmitResponseRequest(
                respondent_id="one",
                answers=[
                    PollAnswerInput(option_key="alpha"),
                    PollAnswerInput(option_key="beta"),
                    PollAnswerInput(option_key="gamma"),
                ],
            ),
        )
        submit_poll_response(
            self.session,
            tenant_id="tenant-1",
            poll_id=poll.id,
            payload=PollSubmitResponseRequest(
                respondent_id="two",
                answers=[
                    PollAnswerInput(option_key="beta"),
                    PollAnswerInput(option_key="alpha"),
                    PollAnswerInput(option_key="gamma"),
                ],
            ),
        )
        summary = poll_result_summary_by_id(self.session, tenant_id="tenant-1", poll_id=poll.id)
        scores = {result["option_key"]: result["score"] for result in summary["option_results"]}

        self.assertEqual(scores["alpha"], 5)
        self.assertEqual(scores["beta"], 5)
        self.assertEqual(scores["gamma"], 2)
        expected_leaders = {
            result["option_id"]
            for result in summary["option_results"]
            if result["option_key"] in {"alpha", "beta"}
        }
        self.assertEqual(set(summary["leading_option_ids"]), expected_leaders)

    def test_availability_summary_counts_available_and_maybe(self) -> None:
        poll = create_poll(
            self.session,
            tenant_id="tenant-1",
            user_id="user-1",
            payload=PollCreateRequest(
                title="Find a slot",
                kind="availability",
                allow_anonymous=True,
                options=[
                    PollOptionInput(key="slot-1", label="Monday", value={"start": "2026-07-13T09:00:00Z"}),
                    PollOptionInput(key="slot-2", label="Tuesday", value={"start": "2026-07-14T09:00:00Z"}),
                ],
            ),
        )
        open_poll(self.session, tenant_id="tenant-1", poll_id=poll.id)

        submit_poll_response(
            self.session,
            tenant_id="tenant-1",
            poll_id=poll.id,
            payload=PollSubmitResponseRequest(
                answers=[
                    PollAnswerInput(option_key="slot-1", value="available"),
                    PollAnswerInput(option_key="slot-2", value="maybe"),
                ]
            ),
        )
        submit_poll_response(
            self.session,
            tenant_id="tenant-1",
            poll_id=poll.id,
            payload=PollSubmitResponseRequest(
                answers=[
                    PollAnswerInput(option_key="slot-1", value="unavailable"),
                    PollAnswerInput(option_key="slot-2", value="available"),
                ]
            ),
        )
        summary = poll_result_summary_by_id(self.session, tenant_id="tenant-1", poll_id=poll.id)
        values = {result["option_key"]: result["values"] for result in summary["option_results"]}

        self.assertEqual(summary["response_count"], 2)
        self.assertEqual(values["slot-1"], {"available": 1, "unavailable": 1})
        self.assertEqual(values["slot-2"], {"maybe": 1, "available": 1})


if __name__ == "__main__":
    unittest.main()