"""NotificationService coverage — mock the DB context.

The service uses `get_db_context()` internally rather than taking a session.
We patch it to a fake context that records inserted notification rows so we
can assert each `send_*` helper builds the right `CreateNotificationParams`
without spinning up a Postgres + Redis stack.
"""

from __future__ import annotations

from contextlib import asynccontextmanager
from typing import TYPE_CHECKING, Any, cast

if TYPE_CHECKING:
    from collections.abc import AsyncIterator
from unittest.mock import AsyncMock, MagicMock, patch
from uuid import UUID, uuid4

import pytest
from roboco.models import NotificationPriority, NotificationType
from roboco.models.notification import CreateNotificationParams
from roboco.services.notification import (
    NotificationService,
    _resolve_agent_uuid,
)


class _FakeDb:
    """Stand-in for AsyncSession that records inserts and pretends to flush."""

    def __init__(self, *, agent_uuid: UUID | None = None) -> None:
        self.added: list = []
        self.committed = False
        self._agent_uuid = agent_uuid

    def add(self, obj: Any) -> None:
        self.added.append(obj)
        # The notification row needs an `id` for delivery_service.deliver().
        obj.id = uuid4()

    async def flush(self) -> None:
        return None

    async def commit(self) -> None:
        self.committed = True

    async def execute(self, *_args: Any, **_kwargs: Any) -> Any:
        # Two paths use this: agent slug→UUID resolution and the
        # notification_delivery service's own DB queries. We return a
        # MagicMock that supports `scalar_one_or_none()` returning either
        # an agent (with .id) or None depending on the configured agent_uuid.
        result = MagicMock()
        if self._agent_uuid:
            agent = MagicMock()
            agent.id = self._agent_uuid
            agent.slug = "test-agent"
            result.scalar_one_or_none.return_value = agent
        else:
            result.scalar_one_or_none.return_value = None
        result.scalars.return_value.all.return_value = []
        return result

    async def scalar(self, *_args: Any, **_kwargs: Any) -> Any:
        # _create_notification's purpose-dedup lookup runs db.scalar(); model
        # "no existing duplicate" so creation proceeds.
        return None


@asynccontextmanager
async def _fake_ctx(db: _FakeDb) -> AsyncIterator[_FakeDb]:
    yield db


@pytest.fixture
def svc() -> NotificationService:
    return NotificationService()


@pytest.mark.asyncio
async def test_resolve_agent_uuid_returns_none_for_blank() -> None:
    db = _FakeDb()
    assert await _resolve_agent_uuid(cast("Any", db), None) is None
    assert await _resolve_agent_uuid(cast("Any", db), "") is None


@pytest.mark.asyncio
async def test_resolve_agent_uuid_passes_through_uuid() -> None:
    aid = uuid4()
    db = _FakeDb()
    assert await _resolve_agent_uuid(cast("Any", db), aid) == aid


@pytest.mark.asyncio
async def test_resolve_agent_uuid_parses_uuid_string() -> None:
    aid = uuid4()
    db = _FakeDb()
    assert await _resolve_agent_uuid(cast("Any", db), str(aid)) == aid


@pytest.mark.asyncio
async def test_resolve_agent_uuid_resolves_slug() -> None:
    expected = uuid4()
    db = _FakeDb(agent_uuid=expected)
    resolved = await _resolve_agent_uuid(cast("Any", db), "be-dev-1")
    assert resolved == expected


@pytest.mark.asyncio
async def test_resolve_agent_uuid_returns_none_for_unknown_slug() -> None:
    db = _FakeDb(agent_uuid=None)
    assert await _resolve_agent_uuid(cast("Any", db), "ghost") is None


class _PatchDbContext:
    """Patch get_db_context + notification_delivery in one block."""

    def __init__(self, db: _FakeDb) -> None:
        self.db = db
        delivery_mock = MagicMock()
        delivery_mock.deliver = AsyncMock(return_value=None)
        self._patches: list[Any] = [
            patch(
                "roboco.services.notification.get_db_context",
                lambda: _fake_ctx(db),
            ),
            patch(
                "roboco.services.notification_delivery.get_notification_delivery_service",
                lambda _db: delivery_mock,
            ),
        ]

    def __enter__(self) -> None:
        for p in self._patches:
            p.start()

    def __exit__(self, *_args: Any) -> None:
        for p in self._patches:
            p.stop()


def _patch_db_context(db: _FakeDb) -> _PatchDbContext:
    return _PatchDbContext(db)


@pytest.mark.asyncio
async def test_send_blocker_notification(svc: NotificationService) -> None:
    aid = uuid4()
    db = _FakeDb(agent_uuid=aid)
    with _patch_db_context(db):
        await svc.send_blocker_notification(
            task_id="t1",
            blocker_reason="reason",
            from_agent="system",
            to_pm="cell-pm",
        )
    assert any("Task t1" in row.subject for row in db.added)


@pytest.mark.asyncio
async def test_send_qa_ready_notification(svc: NotificationService) -> None:
    aid = uuid4()
    db = _FakeDb(agent_uuid=aid)
    with _patch_db_context(db):
        await svc.send_qa_ready_notification(
            task_id="t1", from_agent="be-dev-1", to_qa="be-qa"
        )
    assert any("ready for QA" in row.subject for row in db.added)


@pytest.mark.asyncio
async def test_send_docs_ready_notification(svc: NotificationService) -> None:
    aid = uuid4()
    db = _FakeDb(agent_uuid=aid)
    with _patch_db_context(db):
        await svc.send_docs_ready_notification(
            task_id="t1", from_agent="be-qa", to_documenter="be-doc"
        )
    assert any("needs documentation" in row.subject for row in db.added)


@pytest.mark.asyncio
async def test_send_handoff_notification(svc: NotificationService) -> None:
    aid = uuid4()
    db = _FakeDb(agent_uuid=aid)
    with _patch_db_context(db):
        await svc.send_handoff_notification(
            task_id="t1",
            handoff_id="h1",
            from_agent="be-pm",
            to_documenter="be-doc",
        )
    assert any("Handoff required" in row.subject for row in db.added)


@pytest.mark.asyncio
async def test_send_qa_failed_notification(svc: NotificationService) -> None:
    aid = uuid4()
    db = _FakeDb(agent_uuid=aid)
    with _patch_db_context(db):
        await svc.send_qa_failed_notification(
            task_id="t1", qa_notes="fix this", to_developer="be-dev-1"
        )
    assert any("QA Failed" in row.subject for row in db.added)


@pytest.mark.asyncio
async def test_send_a2a_notification(svc: NotificationService) -> None:
    """priority=URGENT writes the row + the [URGENT] cosmetic prefix.

    Pre-P3-Task-9 this used `urgent: True`; the contract is now a
    tristate `priority` so HIGH can survive end-to-end. See
    tests/integration/test_a2a_priority_tristate.py for the full
    HIGH/NORMAL coverage.
    """
    aid = uuid4()
    db = _FakeDb(agent_uuid=aid)
    with _patch_db_context(db):
        await svc.send_a2a_notification(
            task_id="t1",
            a2a_context={
                "from_agent": "be-dev-1",
                "to_agent": "fe-dev-1",
                "skill": "react",
                "message": "hi",
                "priority": NotificationPriority.URGENT,
            },
        )
    # Urgent prefix appears in subject.
    assert any("URGENT" in row.subject for row in db.added)
    assert any(row.priority == NotificationPriority.URGENT for row in db.added)


@pytest.mark.asyncio
async def test_send_board_review_complete_notification(
    svc: NotificationService,
) -> None:
    """Board-review-complete handoff is an APPROVAL notification to the CEO
    carrying the task_id (cluster C5 / finding #2)."""
    aid = uuid4()
    db = _FakeDb(agent_uuid=aid)
    with _patch_db_context(db):
        await svc.send_board_review_complete_notification(task_id="t1")
    assert any("Board review complete" in row.subject for row in db.added)
    assert any(row.type == NotificationType.APPROVAL for row in db.added)
    assert any(row.priority == NotificationPriority.HIGH for row in db.added)
    assert any(row.related_task_id == "t1" for row in db.added)


@pytest.mark.asyncio
async def test_send_ack_notification(svc: NotificationService) -> None:
    aid = uuid4()
    db = _FakeDb(agent_uuid=aid)
    with _patch_db_context(db):
        await svc.send_ack_notification(
            from_agent="main-pm",
            to_agent="ceo",
            body="please review",
            priority=NotificationPriority.HIGH,
        )
    assert db.added  # Notification row recorded.


@pytest.mark.asyncio
async def test_create_notification_skips_when_from_agent_unresolvable(
    svc: NotificationService,
) -> None:
    """Unresolvable from_agent → log and skip, no row inserted."""
    db = _FakeDb(agent_uuid=None)  # All slug lookups return None.
    with _patch_db_context(db):
        await svc._create_notification(
            CreateNotificationParams(
                notification_type=NotificationType.BLOCKER_ESCALATION,
                priority=NotificationPriority.HIGH,
                from_agent="ghost-agent",
                to_agents=["be-pm"],
                subject="x",
                body="y",
            )
        )
    assert db.added == []


@pytest.mark.asyncio
async def test_create_notification_skips_when_no_resolvable_recipients(
    svc: NotificationService,
) -> None:
    """All recipients unresolvable → skip with warn."""
    aid = uuid4()

    # First call resolves from_agent, subsequent slug lookups still hit our
    # fake — which always returns the same agent. Use a fake that returns the
    # configured agent only on the first lookup.
    class _OnceFake(_FakeDb):
        def __init__(self) -> None:
            super().__init__(agent_uuid=aid)
            self._calls = 0

        async def execute(self, *_args: Any, **_kwargs: Any) -> Any:
            self._calls += 1
            result = MagicMock()
            if self._calls == 1:
                # from_agent resolution succeeds
                agent = MagicMock()
                agent.id = aid
                result.scalar_one_or_none.return_value = agent
            else:
                result.scalar_one_or_none.return_value = None
            result.scalars.return_value.all.return_value = []
            return result

    db = _OnceFake()
    with _patch_db_context(db):
        await svc._create_notification(
            CreateNotificationParams(
                notification_type=NotificationType.BLOCKER_ESCALATION,
                priority=NotificationPriority.HIGH,
                from_agent="be-pm",
                to_agents=["ghost1", "ghost2"],
                subject="x",
                body="y",
            )
        )
    assert db.added == []
