from __future__ import annotations

import unittest
from types import SimpleNamespace
from unittest.mock import AsyncMock, patch
from uuid import uuid4

from fastapi import HTTPException
from pydantic import SecretStr

from .contracts.supervision_research import (
    LearnerAttentionSignal,
    LedgerEvidencePointer,
)
from .routes import supervision_research
from .services import supervision_research_store


def _pointer() -> LedgerEvidencePointer:
    return LedgerEvidencePointer(
        ledger="measurement_event",
        event_id=str(uuid4()),
        session_id=str(uuid4()),
        route_hint="/sessions/{session_id}/measurements",
    )


def _signal() -> LearnerAttentionSignal:
    return LearnerAttentionSignal(
        signal_id="oas-g6-signal-attention-one",
        learner_ref="learner-alpha",
        signal_type="deterioration",
        severity="high",
        state="active",
        uncertainty=0.2,
        observed_sequence=1,
        evidence=(_pointer(),),
    )


class SupervisionResearchStoreIdempotencyTests(unittest.IsolatedAsyncioTestCase):
    async def test_same_submission_returns_stable_snapshot_without_children(self) -> None:
        submission_id = uuid4()
        snapshot_id = uuid4()
        learner_id = uuid4()
        conn = AsyncMock()
        conn.fetchrow.return_value = {
            "snapshot_id": snapshot_id,
            "content_hash": "a" * 64,
        }
        with patch.object(
            supervision_research_store, "_canonical_hash", return_value="a" * 64
        ):
            result = await supervision_research_store.append_attention_snapshot(
                conn,
                submission_id=submission_id,
                snapshot_id=snapshot_id,
                cohort_id="cohort-a",
                signals=[_signal()],
                learner_ids_by_ref={"learner-alpha": learner_id},
            )
        self.assertEqual(result["snapshot_id"], snapshot_id)
        self.assertTrue(result["idempotent_replay"])
        self.assertFalse(result["clinical_claim_allowed"])
        self.assertEqual(conn.execute.await_count, 1)

    async def test_changed_submission_is_conflict(self) -> None:
        conn = AsyncMock()
        conn.fetchrow.return_value = {
            "snapshot_id": uuid4(),
            "content_hash": "b" * 64,
        }
        with patch.object(
            supervision_research_store, "_canonical_hash", return_value="a" * 64
        ):
            with self.assertRaises(
                supervision_research_store.SupervisionResearchConflictError
            ):
                await supervision_research_store.append_attention_snapshot(
                    conn,
                    submission_id=uuid4(),
                    snapshot_id=uuid4(),
                    cohort_id="cohort-a",
                    signals=[_signal()],
                    learner_ids_by_ref={"learner-alpha": uuid4()},
                )


class SupervisionResearchInternalAuthenticationTests(
    unittest.IsolatedAsyncioTestCase
):
    TOKEN = "g6-supervision-research-token-at-least-32-characters"

    async def _assert_rejected_before_db(
        self,
        dependency,
        provider_name: str,
        configured: str | None,
        presented: str | None,
        expected_status: int,
    ) -> None:
        reached = False

        async def fake_provider():
            nonlocal reached
            reached = True
            yield AsyncMock()

        settings = SimpleNamespace(
            supervision_research_internal_token=SecretStr(configured or "")
        )
        with (
            patch.object(supervision_research, provider_name, fake_provider),
        ):
            generator = dependency(settings=settings, presented_token=presented)
            with self.assertRaises(HTTPException) as captured:
                await anext(generator)
        self.assertEqual(captured.exception.status_code, expected_status)
        self.assertFalse(reached)

    async def test_supervisor_missing_configuration_is_503_before_db(self) -> None:
        await self._assert_rejected_before_db(
            supervision_research.supervision_research_internal_supervisor_db,
            "_supervisor_db_provider",
            None,
            None,
            503,
        )

    async def test_research_short_configuration_is_503_before_db(self) -> None:
        await self._assert_rejected_before_db(
            supervision_research.supervision_research_internal_research_db,
            "_research_db_provider",
            "short",
            None,
            503,
        )

    async def test_missing_header_is_401_before_db(self) -> None:
        await self._assert_rejected_before_db(
            supervision_research.supervision_research_internal_supervisor_db,
            "_supervisor_db_provider",
            self.TOKEN,
            None,
            401,
        )

    async def test_wrong_header_is_403_before_db(self) -> None:
        await self._assert_rejected_before_db(
            supervision_research.supervision_research_internal_research_db,
            "_research_db_provider",
            self.TOKEN,
            "wrong-token",
            403,
        )

    async def test_valid_tokens_reach_only_requested_ai_provider(self) -> None:
        supervisor_conn = AsyncMock()
        research_conn = AsyncMock()

        async def fake_supervisor():
            yield supervisor_conn

        async def fake_research():
            yield research_conn

        with (
            patch.object(
                supervision_research, "_supervisor_db_provider", fake_supervisor
            ),
            patch.object(supervision_research, "_research_db_provider", fake_research),
        ):
            supervisor = (
                supervision_research.supervision_research_internal_supervisor_db(
                    settings=SimpleNamespace(
                        supervision_research_internal_token=SecretStr(self.TOKEN)
                    ),
                    presented_token=self.TOKEN
                )
            )
            research = supervision_research.supervision_research_internal_research_db(
                settings=SimpleNamespace(
                    supervision_research_internal_token=SecretStr(self.TOKEN)
                ),
                presented_token=self.TOKEN
            )
            self.assertIs(await anext(supervisor), supervisor_conn)
            self.assertIs(await anext(research), research_conn)
            await supervisor.aclose()
            await research.aclose()


class SupervisionResearchBoundaryTests(unittest.TestCase):
    def test_changed_submission_maps_to_http_409(self) -> None:
        with self.assertRaises(HTTPException) as captured:
            supervision_research._raise_store_error(
                supervision_research_store.SupervisionResearchConflictError(
                    "changed content"
                )
            )
        self.assertEqual(captured.exception.status_code, 409)

    def test_write_response_schemas_have_no_aggregate_score_fields(self) -> None:
        forbidden = {"total", "total_score", "overall_score", "global_score"}
        models = (
            supervision_research.AttentionSnapshotResponse,
            supervision_research.CurriculumGapResponse,
            supervision_research.TeacherDisagreementResponse,
            supervision_research.EvaluationComparisonResponse,
            supervision_research.Phase3ManifestResponse,
        )
        for model in models:
            self.assertTrue(
                forbidden.isdisjoint(model.model_fields),
                f"forbidden score field in {model.__name__}",
            )

    def test_teacher_request_forbids_transcript_payload(self) -> None:
        schema_fields = supervision_research.TeacherDisagreementRequest.model_fields
        self.assertNotIn("transcript", schema_fields)
        self.assertNotIn("raw_transcript", schema_fields)
        self.assertNotIn("utterance_text", schema_fields)


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