"""The create gate's similarity bars are settings, clamped and fail-open (#4385)."""
from unittest.mock import AsyncMock, patch

import pytest

from scribe.services.dedup import (
    _GATE_MIN_BLOCK,
    _GATE_MIN_OVERLAP,
    GATE_DEFAULT_THRESHOLDS,
    _gate_setting,
)

# Bound at import, before the autouse stub in conftest replaces the module
# attribute — so these tests exercise the real read.
_real_gate_setting = _gate_setting


def _setting(value):
    return patch("scribe.services.settings.get_setting", AsyncMock(return_value=value))


@pytest.mark.asyncio
async def test_a_set_value_is_used():
    with _setting("0.95"):
        assert await _real_gate_setting(7, "note_copy", _GATE_MIN_BLOCK) == 0.95


@pytest.mark.asyncio
async def test_a_block_bar_cannot_be_set_low_enough_to_refuse_everything():
    with _setting("0.1"):
        assert await _real_gate_setting(7, "general", _GATE_MIN_BLOCK) == _GATE_MIN_BLOCK


@pytest.mark.asyncio
async def test_the_overlap_floor_has_its_own_lower_clamp():
    with _setting("0.1"):
        assert await _real_gate_setting(7, "note_overlap", _GATE_MIN_OVERLAP) == _GATE_MIN_OVERLAP


@pytest.mark.asyncio
async def test_an_unparseable_value_falls_back_to_the_default():
    with _setting("lots"):
        got = await _real_gate_setting(7, "snippet", _GATE_MIN_BLOCK)
    assert got == GATE_DEFAULT_THRESHOLDS["snippet"]


@pytest.mark.asyncio
async def test_an_unreadable_setting_falls_back_to_the_default():
    with patch("scribe.services.settings.get_setting",
               AsyncMock(side_effect=RuntimeError("db down"))):
        got = await _real_gate_setting(7, "lesson", _GATE_MIN_BLOCK)
    assert got == GATE_DEFAULT_THRESHOLDS["lesson"]


@pytest.mark.asyncio
async def test_the_overlap_floor_never_sits_above_the_block_bar():
    from scribe.services.dedup import gate_bars

    async def _set(user_id, key, lo):
        return {"note_copy": 0.85, "note_overlap": 0.90}[key]

    with patch("scribe.services.dedup._gate_setting", AsyncMock(side_effect=_set)):
        assert await gate_bars(7, "note") == (0.85, 0.85)


@pytest.mark.asyncio
async def test_a_kind_outside_the_copy_band_reads_no_overlap_floor():
    from scribe.services.dedup import gate_bars

    seen = []

    async def _set(user_id, key, lo):
        seen.append(key)
        return GATE_DEFAULT_THRESHOLDS[key]

    with patch("scribe.services.dedup._gate_setting", AsyncMock(side_effect=_set)):
        assert await gate_bars(7, "process") == (0.90, 0.90)
    assert seen == ["general"]