"""NotificationService._create_notification purpose-based dedup (unit).

The dedup short-circuit returns before any row is created when a same-purpose
(same sender, type, task, overlapping recipients) notification is still
unacknowledged. The real-DB query shape is exercised by the route/integration
suites; here we assert the branch wiring with a mocked db context.
"""

from __future__ import annotations

from typing import Any
from unittest.mock import AsyncMock, MagicMock, patch
from uuid import uuid4

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


class _FakeDBCtx:
    """Minimal async-context-manager yielding a mocked db handle."""

    def __init__(self, db: object) -> None:
        self._db = db

    async def __aenter__(self) -> object:
        return self._db

    async def __aexit__(self, *exc: object) -> bool:
        return False


def _params() -> CreateNotificationParams:
    return CreateNotificationParams(
        notification_type=NotificationType.ALERT,
        priority=NotificationPriority.NORMAL,
        from_agent="from-1",
        to_agents=["to-1"],
        subject="s",
        body="b",
        related_task_id="t1",
    )


@pytest.mark.asyncio
async def test_create_notification_suppresses_same_purpose_duplicate() -> None:
    """An existing same-purpose unacked notification suppresses a new insert."""
    db = MagicMock()
    db.scalar = AsyncMock(return_value=uuid4())  # a same-purpose duplicate exists
    db.add = MagicMock()
    db.flush = AsyncMock()
    db.commit = AsyncMock()

    svc = NotificationService()
    cc: Any = svc
    cc._resolve_recipients = AsyncMock(return_value=[uuid4()])
    with (
        patch(
            "roboco.services.notification.get_db_context",
            return_value=_FakeDBCtx(db),
        ),
        patch(
            "roboco.services.notification._resolve_agent_uuid",
            AsyncMock(return_value=uuid4()),
        ),
    ):
        await svc._create_notification(_params())

    # Dedup hit → no row created, nothing committed/delivered.
    db.add.assert_not_called()
    db.commit.assert_not_called()
    db.scalar.assert_awaited_once()


@pytest.mark.asyncio
async def test_informational_knowledge_share_not_deduped() -> None:
    """F010: KNOWLEDGE_SHARE (informational, requires_ack=False) must NOT be
    deduped. Each learning broadcast carries distinct content (a new learning);
    a recipient who never acks the prior one (acking is voluntary for
    informational types) would permanently suppress every subsequent
    knowledge-share from the same sender → silent learning-broadcast data loss.
    The dedup's anti-loop rationale only applies to action-required types."""
    db = MagicMock()
    # A same-purpose unacked KNOWLEDGE_SHARE prior exists — but it must NOT
    # suppress the new one.
    db.scalar = AsyncMock(return_value=uuid4())
    # ``db.add`` must give the row an id — the delivery path calls
    # ``require_uuid(notification.id)``.
    db.add = MagicMock(side_effect=lambda obj: setattr(obj, "id", uuid4()))
    db.flush = AsyncMock()
    db.commit = AsyncMock()

    svc = NotificationService()
    cc: Any = svc
    cc._resolve_recipients = AsyncMock(return_value=[uuid4()])
    params = CreateNotificationParams(
        notification_type=NotificationType.KNOWLEDGE_SHARE,
        priority=NotificationPriority.NORMAL,
        from_agent="from-1",
        to_agents=["to-1"],
        subject="New Learning: bug",
        body="a fresh learning the recipient has not seen",
        related_task_id=None,
    )
    with (
        patch(
            "roboco.services.notification.get_db_context",
            return_value=_FakeDBCtx(db),
        ),
        patch(
            "roboco.services.notification._resolve_agent_uuid",
            AsyncMock(return_value=uuid4()),
        ),
        patch(
            "roboco.services.notification_delivery.get_notification_delivery_service",
            lambda _db: MagicMock(deliver=AsyncMock(return_value=None)),
        ),
    ):
        await svc._create_notification(params)

    # Informational ⇒ NOT suppressed: a row was created + committed.
    db.add.assert_called_once()
    db.commit.assert_awaited_once()