"""Regression tests for two metadata-merge gaps surfaced from /precedents:

1. chair_name was filled ONLY for source_kind='internal_committee', so ועדת-ערר
   decisions uploaded via the EXTERNAL precedent path (source_kind='external_upload',
   source_type='appeals_committee' — e.g. 1132-09-24, a Tel-Aviv decision pulled
   from נבו) never got their chair extracted even though it sits in the signature.

2. practice_area (the /precedents radio facet) was never set by extraction — it was
   passed to the LLM as read-only context only. Committee/court uploads that left it
   blank stayed blank, so the radio rendered nothing selected. It is now derived
   deterministically from the case_number prefix (authoritative for ועדת-ערר dockets)
   with the LLM's content classification as the fallback for court dockets whose
   prefix doesn't encode a domain.

Runs fully OFFLINE — monkeypatches the ``db`` calls ``apply_to_record`` makes.
"""

from __future__ import annotations

import asyncio
from uuid import uuid4

import pytest

from legal_mcp.services import db, precedent_metadata_extractor as pme


def _run(coro):
    loop = asyncio.new_event_loop()
    try:
        return loop.run_until_complete(coro)
    finally:
        loop.close()


def _wire_db(monkeypatch, record: dict) -> dict:
    """Stub the db calls apply_to_record makes; return a dict that captures the
    kwargs passed to update_case_law."""
    captured: dict = {}

    async def _get(_cid):
        return dict(record)

    async def _update(_cid, **fields):
        captured.update(fields)
        return {**record, **fields}

    async def _collides(_cn, _cid):
        return False

    monkeypatch.setattr(db, "get_case_law", _get)
    monkeypatch.setattr(db, "update_case_law", _update)
    monkeypatch.setattr(db, "case_number_collides", _collides)
    # citation_formatted is pre-set in every fixture below, so the deterministic
    # formatter is never reached — stub defensively anyway.
    monkeypatch.setattr(db, "format_precedent_citation", lambda *a, **k: "")
    return captured


def test_external_committee_decision_gets_chair_name(monkeypatch):
    """source_kind=external_upload + source_type=appeals_committee → chair filled."""
    record = {
        "source_kind": "external_upload",
        "source_type": "appeals_committee",
        "case_number": "1132-09-24",
        "chair_name": "",
        "district": "תל אביב",
        "practice_area": "rishuy_uvniya",
        "citation_formatted": "ערר ... 1132-09-24",
    }
    captured = _wire_db(monkeypatch, record)
    suggested = {"chair_name": "מיכל דגני הלברשטם", "district": "תל אביב"}
    out = _run(pme.apply_to_record(uuid4(), suggested))
    assert out["updated"] is True
    assert captured.get("chair_name") == "מיכל דגני הלברשטם"


def test_court_ruling_never_gets_chair_name(monkeypatch):
    """A court ruling is not a committee decision — chair must stay empty even if
    the model slips and returns one."""
    record = {
        "source_kind": "external_upload",
        "source_type": "court_ruling",
        "precedent_level": "עליון",
        "case_number": 'ע"א 4768/22',
        "chair_name": "",
        "district": "",
        "practice_area": "betterment_levy",
        "citation_formatted": 'ע"א 4768/22',
    }
    captured = _wire_db(monkeypatch, record)
    suggested = {"chair_name": "פלוני אלמוני"}
    _run(pme.apply_to_record(uuid4(), suggested))
    assert "chair_name" not in captured


def test_practice_area_derived_from_case_number_prefix(monkeypatch):
    """8xxx docket → betterment_levy, deterministically, even if the LLM
    suggested nothing (or something else)."""
    record = {
        "source_kind": "external_upload",
        "source_type": "appeals_committee",
        "case_number": "8126-03-25",
        "chair_name": "פלונית",
        "district": "ירושלים",
        "practice_area": "",
        "citation_formatted": "ערר ... 8126-03-25",
    }
    captured = _wire_db(monkeypatch, record)
    out = _run(pme.apply_to_record(uuid4(), {}))
    assert out["updated"] is True
    assert captured.get("practice_area") == "betterment_levy"


def test_practice_area_falls_back_to_llm_for_court_docket(monkeypatch):
    """A Supreme-Court docket prefix (4xxx) encodes no domain → use the LLM's
    content classification."""
    record = {
        "source_kind": "external_upload",
        "source_type": "court_ruling",
        "precedent_level": "עליון",
        "case_number": 'ע"א 4768/22',
        "chair_name": "",
        "district": "",
        "practice_area": "",
        "citation_formatted": 'ע"א 4768/22',
    }
    captured = _wire_db(monkeypatch, record)
    out = _run(pme.apply_to_record(uuid4(), {"practice_area": "betterment_levy"}))
    assert captured.get("practice_area") == "betterment_levy"


def test_practice_area_not_overwritten_when_present(monkeypatch):
    """An existing practice_area (chair-set or earlier derivation) is preserved —
    the prefix derivation only fills the blank."""
    record = {
        "source_kind": "external_upload",
        "source_type": "appeals_committee",
        "case_number": "8126-03-25",  # prefix would say betterment_levy
        "chair_name": "פלונית",
        "district": "ירושלים",
        "practice_area": "compensation_197",  # but a human said 197 — keep it
        "citation_formatted": "ערר ... 8126-03-25",
    }
    captured = _wire_db(monkeypatch, record)
    _run(pme.apply_to_record(uuid4(), {"practice_area": "rishuy_uvniya"}))
    assert "practice_area" not in captured


def test_invalid_llm_practice_area_is_dropped(monkeypatch):
    """The LLM returning a non-domain value (legacy 'appeals_committee' / free text)
    must not be written — and with no usable prefix, practice_area stays blank."""
    record = {
        "source_kind": "external_upload",
        "source_type": "court_ruling",
        "precedent_level": "עליון",
        "case_number": 'ע"א 4768/22',
        "chair_name": "",
        "district": "",
        "practice_area": "",
        "citation_formatted": 'ע"א 4768/22',
    }
    captured = _wire_db(monkeypatch, record)
    _run(pme.apply_to_record(uuid4(), {"practice_area": "appeals_committee"}))
    assert "practice_area" not in captured