"""Rule and preference creates surface the records they overlap (#4134).

Rules and preferences share one table and one ranking, so a preference that
restates a rule splits one instruction in two — and when only the preference
places, binding guidance arrives labelled optional. The title gate could not
see it: a second record about the same moment is exactly the one written
under a different title.

These tests pin three things:

- WHAT is compared: the new record's rule_document (the shape the corpus is
  embedded as), against BOTH kinds, in the scope the new record will rank in.
- THAT it advises rather than blocks. The measurement above
  dedup._RULE_OVERLAP_FLOOR found distinct neighbours scoring as high as a
  true restatement, so a block would refuse legitimate records.
- WHERE it runs: all three create doors, before the create, so the new record
  cannot match itself.

`find_overlapping_rules` is bound here at import time, before conftest's
autouse `_no_rule_overlap` replaces the module attribute, so the service tests
exercise the real function and stub the search beneath it.
"""
from __future__ import annotations

import ast
import inspect
import pathlib
from unittest.mock import AsyncMock, patch

import pytest

from scribe.services import dedup
from scribe.services.dedup import (
    RuleOverlap,
    find_overlapping_rules,
    overlap_response,
)
from tests.helpers import fake_rule
from tests.helpers import plain_rule_detail as _plain_detail

pytestmark = pytest.mark.usefixtures("_bind_user")

SEARCH = "scribe.services.dedup.embeddings_svc.semantic_search_rules"
TOOLS = "scribe.mcp.tools.rulebooks"

# Long enough to clear _MIN_BODY_FOR_SEMANTIC in the rule_document shape.
TRIGGER = (
    "About to push a commit to dev and stop to ask whether pushing is allowed, "
    "or ending a turn with a question about landing work that was already "
    "committed on the branch the operator treats as home."
)
STATEMENT = "Push to dev after committing without asking first."


# ── what is compared ──────────────────────────────────────────────────────


@pytest.mark.asyncio
async def test_the_query_is_the_embedded_document_shape():
    search = AsyncMock(return_value=[])
    with patch(SEARCH, search):
        await find_overlapping_rules(7, "Push without asking", STATEMENT, TRIGGER)
    query = search.call_args.args[1]
    title, body = dedup.embeddings_svc.rule_document(
        "Push without asking", STATEMENT, TRIGGER,
    )
    assert query == f"{title}\n\n{body}"
    assert "When to apply:" in query


@pytest.mark.asyncio
async def test_both_kinds_are_searched():
    """The harm is ACROSS kinds; a kind filter would hide exactly it."""
    search = AsyncMock(return_value=[])
    with patch(SEARCH, search):
        await find_overlapping_rules(7, "t", STATEMENT, TRIGGER)
    assert search.call_args.kwargs.get("kind") is None


@pytest.mark.asyncio
async def test_a_global_record_is_compared_with_every_rule_the_caller_owns():
    search = AsyncMock(return_value=[])
    with patch(SEARCH, search):
        await find_overlapping_rules(7, "t", STATEMENT, TRIGGER)
    kw = search.call_args.kwargs
    assert kw["everywhere"] is True
    assert kw["project_id"] is None


@pytest.mark.asyncio
async def test_a_project_rule_is_compared_with_what_it_will_rank_against():
    search = AsyncMock(return_value=[])
    with patch(SEARCH, search):
        await find_overlapping_rules(7, "t", STATEMENT, TRIGGER, project_id=5)
    kw = search.call_args.kwargs
    assert kw["project_id"] == 5
    assert kw["everywhere"] is False


@pytest.mark.asyncio
async def test_the_floor_is_the_measured_one():
    search = AsyncMock(return_value=[])
    with patch(SEARCH, search):
        await find_overlapping_rules(7, "t", STATEMENT, TRIGGER)
    assert search.call_args.kwargs["threshold"] == dedup._RULE_OVERLAP_FLOOR


def test_the_floor_sits_below_the_measured_restatement():
    """A reworded duplicate of a real rule scored 0.850 (the measurement above
    _RULE_OVERLAP_FLOOR). A floor at or above that misses the case the check
    exists for; this fails if someone raises it there by analogy with the
    blocking gates' 0.90+."""
    assert dedup._RULE_OVERLAP_FLOOR < 0.85


@pytest.mark.asyncio
async def test_a_short_document_is_not_searched():
    search = AsyncMock(return_value=[])
    with patch(SEARCH, search):
        out = await find_overlapping_rules(7, "t", "s", "when")
    assert out == []
    search.assert_not_called()


@pytest.mark.asyncio
async def test_a_failed_search_lets_the_create_through():
    with patch(SEARCH, AsyncMock(side_effect=RuntimeError("no embedder"))):
        out = await find_overlapping_rules(7, "t", STATEMENT, TRIGGER)
    assert out == []


@pytest.mark.asyncio
async def test_hits_carry_their_kind():
    hits = [
        (0.8504, fake_rule(id=1, title="`dev` is home", kind="rule")),
        (0.81, fake_rule(id=9, title="Report pushes", kind="preference", project_id=3)),
    ]
    with patch(SEARCH, AsyncMock(return_value=hits)):
        out = await find_overlapping_rules(7, "t", STATEMENT, TRIGGER)
    assert out == [
        RuleOverlap(1, "`dev` is home", "rule", None, 0.85),
        RuleOverlap(9, "Report pushes", "preference", 3, 0.81),
    ]


# ── what it says ──────────────────────────────────────────────────────────


def test_no_overlap_adds_nothing():
    assert overlap_response([], "rule") == {}


def test_the_note_names_the_record_to_read_and_both_outcomes():
    out = overlap_response(
        [RuleOverlap(1, "`dev` is home", "rule", None, 0.85)], "preference",
    )
    assert out["overlaps"] == [{
        "id": 1, "title": "`dev` is home", "kind": "rule",
        "project_id": None, "similarity": 0.85,
    }]
    note = out["overlap_note"]
    assert "Created" in note                 # it did not block
    assert "update_rule" in note             # the top match's own door
    assert "delete this preference" in note  # the new record's kind
    assert "keep both" in note               # distinct records are legitimate


# ── where it runs ─────────────────────────────────────────────────────────


def _rule_one_overlaps():
    return [RuleOverlap(1, "`dev` is home", "rule", None, 0.85)]


@pytest.mark.asyncio
async def test_create_rule_checks_before_creating_and_reports():
    order: list[str] = []
    find = AsyncMock(side_effect=lambda *a, **k: order.append("find") or _rule_one_overlaps())
    create = AsyncMock(side_effect=lambda **k: order.append("create") or fake_rule(id=50))
    with patch(f"{TOOLS}.dedup_svc.find_duplicate_rule", AsyncMock(return_value=None)), \
         patch(f"{TOOLS}.dedup_svc.find_overlapping_rules", find), \
         patch(f"{TOOLS}.rulebooks_svc.create_rule", create), _plain_detail():
        from scribe.mcp.tools.rulebooks import create_rule
        out = await create_rule(
            topic_id=10, title="Push without asking", statement=STATEMENT,
            when_to_apply=TRIGGER,
        )
    assert order == ["find", "create"]
    assert find.call_args.args == (7, "Push without asking", STATEMENT, TRIGGER)
    assert out["id"] == 50
    assert out["overlaps"][0]["id"] == 1


@pytest.mark.asyncio
async def test_create_project_rule_checks_in_its_project():
    find = AsyncMock(return_value=_rule_one_overlaps())
    with patch(f"{TOOLS}.dedup_svc.find_duplicate_rule", AsyncMock(return_value=None)), \
         patch(f"{TOOLS}.dedup_svc.find_overlapping_rules", find), \
         patch(f"{TOOLS}.rulebooks_svc.create_project_rule",
               AsyncMock(return_value=fake_rule(id=51, project_id=5, topic_id=None))), \
         _plain_detail():
        from scribe.mcp.tools.rulebooks import create_project_rule
        out = await create_project_rule(
            project_id=5, title="Push without asking", statement=STATEMENT,
            when_to_apply=TRIGGER,
        )
    assert find.call_args.kwargs == {"project_id": 5}
    assert "overlap_note" in out


@pytest.mark.asyncio
async def test_create_preference_checks_and_names_itself_a_preference():
    find = AsyncMock(return_value=_rule_one_overlaps())
    with patch(f"{TOOLS}.dedup_svc.find_duplicate_rule", AsyncMock(return_value=None)), \
         patch(f"{TOOLS}.dedup_svc.find_overlapping_rules", find), \
         patch(f"{TOOLS}.rulebooks_svc.create_rule",
               AsyncMock(return_value=fake_rule(id=52, kind="preference"))), \
         _plain_detail():
        from scribe.mcp.tools.rulebooks import create_preference
        out = await create_preference(
            topic_id=10, title="Push without asking", statement=STATEMENT,
            when_to_apply=TRIGGER, arose_from_id=42,
        )
    find.assert_awaited_once()
    assert "delete this preference" in out["overlap_note"]


@pytest.mark.asyncio
async def test_a_create_with_no_overlap_reads_as_before():
    with patch(f"{TOOLS}.dedup_svc.find_duplicate_rule", AsyncMock(return_value=None)), \
         patch(f"{TOOLS}.dedup_svc.find_overlapping_rules", AsyncMock(return_value=[])), \
         patch(f"{TOOLS}.rulebooks_svc.create_rule",
               AsyncMock(return_value=fake_rule(id=53))), _plain_detail():
        from scribe.mcp.tools.rulebooks import create_rule
        out = await create_rule(
            topic_id=10, title="t", statement=STATEMENT, when_to_apply=TRIGGER,
        )
    assert "overlaps" not in out and "overlap_note" not in out


CREATE_DOORS = ("create_rule", "create_project_rule", "create_preference")


def test_every_rule_create_door_asks():
    """Structural, so a fourth create door fails here rather than shipping
    with the title gate alone. Keyed on the doors that call
    find_duplicate_rule: any door gated by title must also be checked by
    meaning, because the title gate is the one that cannot see this."""
    root = pathlib.Path(__file__).resolve().parents[1] / "src" / "scribe"
    tree = ast.parse((root / "mcp" / "tools" / "rulebooks.py").read_text())
    title_gated, overlap_checked = set(), set()
    for fn in tree.body:
        if not isinstance(fn, ast.AsyncFunctionDef):
            continue
        for node in ast.walk(fn):
            if isinstance(node, ast.Attribute):
                if node.attr == "find_duplicate_rule":
                    title_gated.add(fn.name)
                elif node.attr == "find_overlapping_rules":
                    overlap_checked.add(fn.name)
    assert title_gated >= set(CREATE_DOORS), "registry drifted from the module"
    assert title_gated <= overlap_checked, (
        f"title-gated but never checked by meaning: "
        f"{sorted(title_gated - overlap_checked)}"
    )


def test_the_stale_premise_is_gone():
    """find_duplicate_rule claimed rules were not a semantic-retrieval surface
    — false since rules were embedded, and the reason this gap survived."""
    doc = inspect.getdoc(dedup.find_duplicate_rule) or ""
    assert "aren't a semantic-retrieval" not in doc
    assert "find_overlapping_rules" in doc