"""Tests for the usage signal (#2085) — was a surfaced record ever pulled?

Covers the payload shaping and the two contracts that make this safe to leave in
the hot path: telemetry never raises, and telemetry never blocks. Plus the thing
the feature exists for — that the write-path PLACE arm is now recorded, since
before this it surfaced snippets while leaving no trace anywhere.
"""
from unittest.mock import AsyncMock, MagicMock, patch

import pytest

from scribe.services import note_usage
from scribe.services.note_usage import (
    empty_usage,
    record_pulled,
    record_surfaced,
    usage_for_notes,
)


def _note(nid, title, user_id=1):
    n = MagicMock()
    n.id, n.title, n.user_id = nid, title, user_id
    n.note_type = "snippet"
    return n


# --- recording ------------------------------------------------------------


async def test_record_surfaced_writes_one_row_per_note():
    with patch.object(note_usage, "_schedule") as sched:
        record_surfaced(user_id=7, note_ids=[11, 12], source="auto_inject")
    rows = sched.call_args[0][0]
    assert [r["note_id"] for r in rows] == [11, 12]
    assert {r["event"] for r in rows} == {"surfaced"}
    assert {r["source"] for r in rows} == {"auto_inject"}
    assert {r["user_id"] for r in rows} == {7}


async def test_record_pulled_writes_a_single_row():
    with patch.object(note_usage, "_schedule") as sched:
        record_pulled(user_id=7, note_id=11, source="mcp_get_snippet")
    rows = sched.call_args[0][0]
    assert rows == [
        {"user_id": 7, "note_id": 11, "event": "pulled", "source": "mcp_get_snippet"}
    ]


async def test_empty_menu_schedules_nothing():
    """No notes surfaced is not an event — it must not cost a write."""
    with patch.object(note_usage, "_insert_events") as ins:
        record_surfaced(user_id=1, note_ids=[], source="auto_inject")
    ins.assert_not_called()


async def test_recording_never_raises_on_bad_input():
    """Telemetry sits in the hot path of every retrieval. A malformed id must
    cost a data point, never the operator's request."""
    with patch.object(note_usage, "_schedule"):
        record_surfaced(user_id=1, note_ids=["not-an-int"], source="auto_inject")
        record_pulled(user_id=1, note_id=None, source="mcp_get_note")


async def test_recording_without_an_event_loop_is_skipped_not_raised():
    """Called from a sync context outside the app (a script, a test helper),
    there is no loop to schedule on. Skip rather than blow up."""
    with patch.object(
        note_usage.asyncio, "get_running_loop", side_effect=RuntimeError
    ):
        record_pulled(user_id=1, note_id=5, source="mcp_get_note")


# --- readout --------------------------------------------------------------


async def test_usage_for_notes_zero_fills_every_requested_id():
    """The caller renders this shape unconditionally, so a note with no events
    must come back as zeroes, not as a missing key."""
    session = MagicMock()
    session.execute = AsyncMock(return_value=MagicMock(all=MagicMock(return_value=[])))
    ctx = MagicMock()
    ctx.__aenter__ = AsyncMock(return_value=session)
    ctx.__aexit__ = AsyncMock(return_value=False)
    with patch.object(note_usage, "async_session", return_value=ctx):
        out = await usage_for_notes([3, 4])
    assert out == {3: empty_usage(), 4: empty_usage()}


async def test_usage_for_notes_splits_counts_by_event():
    from datetime import datetime, timezone

    ts = datetime(2026, 7, 28, tzinfo=timezone.utc)
    rows = [(3, "surfaced", 9, ts), (3, "pulled", 2, ts)]
    session = MagicMock()
    session.execute = AsyncMock(
        return_value=MagicMock(all=MagicMock(return_value=rows))
    )
    ctx = MagicMock()
    ctx.__aenter__ = AsyncMock(return_value=session)
    ctx.__aexit__ = AsyncMock(return_value=False)
    with patch.object(note_usage, "async_session", return_value=ctx):
        out = await usage_for_notes([3])
    assert out[3]["surfaced_count"] == 9
    assert out[3]["pull_count"] == 2
    assert out[3]["last_pulled_at"] == ts.isoformat()


async def test_usage_readout_failure_degrades_to_zeroes():
    """A telemetry readout must not be able to break the list it decorates."""
    with patch.object(note_usage, "async_session", side_effect=RuntimeError("boom")):
        out = await usage_for_notes([3])
    assert out == {3: empty_usage()}


async def test_no_ids_short_circuits_without_a_query():
    with patch.object(note_usage, "async_session") as sess:
        assert await usage_for_notes([]) == {}
    sess.assert_not_called()


# --- the gap this closes --------------------------------------------------


@pytest.mark.parametrize(
    "marker, expected_source",
    [("here", "write_path_place"), ("nearby", "write_path_place")],
)
async def test_write_path_place_arm_is_recorded(marker, expected_source):
    """The place arm carries no score, so it has no home in retrieval_logs — it
    surfaced snippets while leaving no trace anywhere. That was the blocker
    #2082 recorded against this task; this is the assertion that it's closed."""
    from scribe.services import plugin_context

    here = [{"id": 42, "title": "helper", "user_id": 1, "note_type": "snippet"}]
    with (
        patch.object(
            plugin_context,
            "get_writepath_config",
            AsyncMock(return_value={"enabled": True, "threshold": 0.55, "top_k": 3}),
        ),
        patch.object(
            plugin_context.snippets_svc,
            "list_snippets",
            AsyncMock(side_effect=[(here, 1), ([], 0)]),
        ),
        patch.object(
            plugin_context, "semantic_search_notes", AsyncMock(return_value=[])
        ),
        patch.object(plugin_context, "owner_names_for", AsyncMock(return_value={})),
        patch.object(plugin_context, "record_retrieval"),
        patch.object(plugin_context, "record_surfaced") as surfaced,
    ):
        out = await plugin_context.build_write_path_hint(
            1, "src/a.py", code="def f(): pass"
        )

    assert out["note_ids"] == [42]
    sources = {c.kwargs["source"] for c in surfaced.call_args_list}
    assert expected_source in sources


async def test_auto_inject_records_what_survived_the_margin_gate():
    """Not what the ranker returned — retrieval_logs already holds that. These
    two numbers must not silently mean different things per surface."""
    from scribe.services import plugin_context

    hits = [(0.90, _note(1, "kept")), (0.40, _note(2, "cut by the margin gate"))]
    with (
        patch.object(
            plugin_context,
            "get_autoinject_config",
            AsyncMock(return_value={"enabled": True, "threshold": 0.3, "top_k": 5}),
        ),
        patch.object(
            plugin_context, "semantic_search_notes", AsyncMock(return_value=hits)
        ),
        patch.object(plugin_context, "owner_names_for", AsyncMock(return_value={})),
        patch.object(plugin_context, "record_retrieval"),
        patch.object(plugin_context, "record_surfaced") as surfaced,
    ):
        await plugin_context.build_autoinject_hint(1, "a query")

    assert surfaced.call_args.kwargs["note_ids"] == [1]
    assert surfaced.call_args.kwargs["source"] == "auto_inject"