"""Regression — like-notification dedup (repeated like must not spam).

``toggle_like`` returns ``(like_count, changed)`` and both callers
(HTTP router + MCP ``feed_react_post``) gate ``notify_like_added`` on
``changed``. Before the fix, every repeated like call (double-click,
LLM retry loop) re-delivered an "X liked your post" inbox notification
to the author.
"""
from __future__ import annotations

import pytest
from sqlalchemy.ext.asyncio import AsyncSession

from app.domains.feed.service import FeedService


@pytest.mark.asyncio
async def test_double_like_notifies_exactly_once(
    client,
    db_session: AsyncSession,
    admin_user,
    employee_user,
    monkeypatch,
) -> None:
    author, _ = admin_user
    liker, liker_token = employee_user

    # Eager-load org_memberships — ``create_user_post`` resolves the
    # author's primary department and a sync lazy-load would raise
    # MissingGreenlet under the async session.
    await db_session.refresh(author, attribute_names=["org_memberships"])
    post, _ = await FeedService(db_session).create_user_post(
        author=author, body="hello world", visibility="public",
        category="general", mentioned_person_ids=[], attachments=[],
    )
    await db_session.commit()

    calls: list[str] = []

    async def _spy(db, *, post_id: str, liker) -> None:
        calls.append(post_id)

    monkeypatch.setattr(
        "app.domains.feed.notifications.notify_like_added", _spy,
    )

    headers = {"Authorization": f"Bearer {liker_token}"}
    r1 = await client.post(f"/api/v1/feed/posts/{post.id}/like", headers=headers)
    r2 = await client.post(f"/api/v1/feed/posts/{post.id}/like", headers=headers)
    assert r1.status_code == 200 and r2.status_code == 200
    assert r1.json()["data"]["like_count"] == 1
    assert r2.json()["data"]["like_count"] == 1

    # Exactly one notification: the duplicate like changed nothing.
    assert calls == [post.id]

    # Unlike never notifies.
    r3 = await client.delete(f"/api/v1/feed/posts/{post.id}/like", headers=headers)
    assert r3.status_code == 200
    assert calls == [post.id]