"""Finding engine — FACT/REQUIREMENT/INFERENCE, provenance clamp, decisions."""

from __future__ import annotations

from backend.periscopex.finding_engine import (
    DesignerDecision,
    apply_decisions,
    complete_finding,
    finding_fingerprint,
    lookup_rule,
)
from backend.periscopex.models import Finding
from backend.periscopex.validate import assign_finding_ids, _parse_review


def test_recommended_never_error():
    f = Finding(
        designator="U1",
        finding="layout note",
        why="place close",
        status="ERROR",
        rule_id="PE-THM-001",
        source="pcb_power_thermal",
        evidence_status="SUFFICIENT",
        facts="no pour",
        requirement="datasheet layout page",
    )
    complete_finding(f)
    assert f.provenance == "RECOMMENDED"
    assert f.status != "ERROR"
    assert f.finding_class != "RULE"


def test_llm_review_is_never_rule():
    result = _parse_review(
        {
            "findings": [{
                "finding": "strap",
                "why": "datasheet",
                "status": "ERROR",
                "source_page": 2,
                "source_quote": "PSEL must be high for 3.3 V.",
                "recommendation": "Tie PSEL high.",
            }],
            "checked_areas": [],
        },
        "U1",
        "PART",
    )
    f = result.findings[0]
    complete_finding(f)
    assert f.finding_class == "REVIEW"
    assert f.facts
    assert f.requirement
    assert f.status == "ERROR"


def test_insufficient_evidence_does_not_stay_error():
    f = Finding(
        designator="U1",
        finding="narrow trace",
        why="",
        status="ERROR",
        source="pcb_power_thermal",
        rule_id="PE-PWR-001",
        evidence_status="INSUFFICIENT",
    )
    complete_finding(f)
    assert f.status != "ERROR"
    assert "Insufficient evidence" in f.inference
    assert f.finding_class != "RULE" or f.evidence_status == "INSUFFICIENT"


def test_decision_suppresses_rescan_nag():
    f = Finding(
        designator="U1",
        finding="PSEL low",
        why="must be high",
        status="ERROR",
        rule_id="PE-MUX-001",
        source="pin_mux_check",
        net="PSEL",
        aspect="config",
        facts="PSEL net is GND",
        requirement="PSEL high for 3V3",
    )
    complete_finding(f)
    assert f.status == "ERROR"
    d = DesignerDecision(
        decision_id="DEC-1",
        fingerprint=finding_fingerprint(f),
        rule_id="PE-MUX-001",
        designator="U1",
        net="PSEL",
        aspect="config",
        intent="wontfix",
        reason="PSEL low intentional",
    )
    apply_decisions([f], [d])
    assert f.suppressed is True
    assert f.status == "INFO"
    assert f.finding_class == "INFO"
    assert "PSEL low intentional" in f.inference


def test_schematic_assign_ids_fills_engine_fields():
    f = Finding(
        designator="U3",
        finding="NC tied",
        why="NC must float",
        status="ERROR",
        rule_id="PE-NC-001",
        source="nc_pin_check",
    )
    assign_finding_ids([f])
    assert f.finding_id == "U3-001"
    assert f.facts == "NC tied"
    assert f.requirement
    assert f.provenance == "MANDATORY"
    assert f.finding_class == "RULE"
    assert f.confidence is not None


def test_same_object_pcb_and_schema():
    assert lookup_rule("PE-NC-001").domain == "schema"
    assert lookup_rule("PE-LAY-001").domain == "pcb"
    sch = Finding(designator="U1", finding="x", status="INFO", rule_id="PE-NC-001", source="nc_pin_check")
    pcb = Finding(designator="U1", finding="y", status="INFO", rule_id="PE-LAY-001", source="pcb_net_match")
    complete_finding(sch)
    complete_finding(pcb)
    for obj in (sch, pcb):
        assert obj.facts
        assert obj.finding_class
        assert obj.provenance
        assert obj.evidence_status
        assert (obj.action or "").strip()


def test_empty_recommendation_gets_action():
    f = Finding(designator="U1", finding="note", status="INFO", source="review")
    complete_finding(f)
    assert f.action.strip()
    assert f.recommendation.strip() == f.action.strip()


def test_recommended_rc_cap_is_review_not_rule():
    f = Finding(
        designator="C1",
        finding="10n vs 100n",
        why="datasheet typical 100n",
        status="WARNING",
        rule_id="PE-DEC-002",
        source="passive_rail_check",
    )
    complete_finding(f)
    assert f.finding_class == "REVIEW"
    assert f.provenance == "RECOMMENDED"
    assert f.status != "ERROR"