"""US-006 (PRD 5.18) — enrich_suggestions = pre-filtru NUL + k-NN pe corpus etichetat.

Ordinea de precedenta: pre-filtru NUL -> (daca NUL: fara cod) altfel GOLD partajat >
exact (SILVER) > k-NN embeddings. k-NN sub prag -> abtinere. Vecin k-NN NUL -> supresie.
Invariant #13: nimic din asta nu intra in resolve_prestatii/load_mapping.
"""

from __future__ import annotations

import os
import tempfile

import pytest


@pytest.fixture()
def env(monkeypatch):
    tmp = tempfile.mkdtemp()
    monkeypatch.setenv("AUTOPASS_DB_PATH", os.path.join(tmp, "us006.db"))
    monkeypatch.setenv("AUTOPASS_WEB_AUTH_REQUIRED", "false")
    monkeypatch.setenv("AUTOPASS_EMBEDDINGS_ENABLED", "true")
    from app.config import get_settings
    get_settings.cache_clear()
    from app.db import init_db
    init_db()
    yield monkeypatch
    get_settings.cache_clear()


@pytest.fixture()
def conn(env):
    from app.db import get_connection
    c = get_connection()
    yield c
    c.close()


def _silver(conn, denumire_norm, cod, is_nul=0):
    conn.execute(
        "INSERT OR IGNORE INTO mapping_suggestions "
        "(denumire_normalizata, cod_prestatie, is_nul, source, confidence) VALUES (?, ?, ?, 'llm_seed', 0.7)",
        (denumire_norm, cod, is_nul),
    )
    conn.commit()


def _mock_embedding(monkeypatch, cod, sim, is_nul=False):
    import app.embeddings as emb
    monkeypatch.setattr(emb, "has_corpus", lambda: True)
    monkeypatch.setattr(emb, "suggest_nearest",
                        lambda text, top_k=1: [{"cod": cod, "is_nul": is_nul, "similaritate": sim}])


def test_prefiltru_nul_supreseaza_inainte_de_knn(conn, monkeypatch):
    # Embedding-ul AR sugera un cod, dar pre-filtrul NUL trebuie sa scurtcircuiteze.
    chemat = {"da": False}
    import app.embeddings as emb
    monkeypatch.setattr(emb, "has_corpus", lambda: True)

    def spion(text, top_k=1):
        chemat["da"] = True
        return [{"cod": "OE-1", "is_nul": False, "similaritate": 0.99}]

    monkeypatch.setattr(emb, "suggest_nearest", spion)
    from app.mapping import enrich_suggestions
    out = enrich_suggestions(conn, "13 X ITP")
    assert out["sugestie_principala"] is None      # non-operatie -> fara cod
    assert out["surse"]["nul"] is True
    assert chemat["da"] is False                    # k-NN nici macar interogat


def test_precedenta_gold_exact_embedding(conn, monkeypatch):
    from app.shared_store import record_human_validation
    from app.mapping import enrich_suggestions, normalize_for_match
    den = "OPERATIE DE TEST UNICA"
    norm = normalize_for_match(den)

    # Toate trei sursele dau coduri diferite.
    record_human_validation(conn, den, "OE-1")     # GOLD partajat
    _silver(conn, norm, "OE-2")                     # SILVER exact
    _mock_embedding(monkeypatch, "OE-3", 0.99)      # embedding
    conn.commit()

    out = enrich_suggestions(conn, den)
    assert out["sugestie_principala"] == {"cod_prestatie": "OE-1", "sursa": "gold_partajat"}

    # Fara GOLD -> castiga SILVER.
    conn.execute("DELETE FROM shared_mappings")
    conn.commit()
    out = enrich_suggestions(conn, den)
    assert out["sugestie_principala"]["sursa"] == "silver"
    assert out["sugestie_principala"]["cod_prestatie"] == "OE-2"

    # Fara GOLD si fara SILVER -> castiga embedding.
    conn.execute("DELETE FROM mapping_suggestions")
    conn.commit()
    out = enrich_suggestions(conn, den)
    assert out["sugestie_principala"] == {"cod_prestatie": "OE-3", "sursa": "embedding"}


def test_prag_similaritate(conn, monkeypatch):
    from app.mapping import enrich_suggestions, EMB_MIN_SIMILARITATE
    _mock_embedding(monkeypatch, "OE-3", EMB_MIN_SIMILARITATE + 0.01)
    out = enrich_suggestions(conn, "CEVA NEVAZUT")
    assert out["surse"]["embedding"] == "OE-3"


def test_abtinere_sub_prag(conn, monkeypatch):
    from app.mapping import enrich_suggestions, EMB_MIN_SIMILARITATE
    _mock_embedding(monkeypatch, "OE-3", EMB_MIN_SIMILARITATE - 0.01)
    out = enrich_suggestions(conn, "CEVA NEVAZUT")
    assert out["surse"]["embedding"] is None        # sub prag -> abtinere
    assert out["sugestie_principala"] is None


def test_vecin_knn_nul_supreseaza(conn, monkeypatch):
    from app.mapping import enrich_suggestions
    _mock_embedding(monkeypatch, None, 0.99, is_nul=True)   # vecin NUL peste prag
    out = enrich_suggestions(conn, "CEVA CARE SEAMANA CU GUNOI")
    assert out["surse"]["embedding"] is None        # NUL -> nu produce cod
    assert out["surse"]["nul"] is True
    assert out["sugestie_principala"] is None


def test_invariant_13_resolve_neatins(conn):
    """Regresie #13: SILVER populat NU produce auto-rezolvare in resolve_prestatii."""
    from app.mapping import resolve_prestatii, normalize_for_match
    _silver(conn, normalize_for_match("OPERATIE X"), "OE-1")
    resolved, unmapped = resolve_prestatii(
        [{"cod_op_service": "OPERATIE X", "denumire": "OPERATIE X"}], mapping={}, valid_codes={"OE-1"}
    )
    assert resolved[0]["cod_prestatie"] is None     # ramane nemapat, NU ia codul din SILVER
    assert unmapped and unmapped[0]["cod_op_service"] == "OPERATIE X"