"""Tests for the Regulatory Reasoning Engine.

Covers the five typical machine-builder scenarios and the ten acceptance
questions from the build spec (§15). Engine tests are pure (no DB); the
endpoint smoke tests mount only the reasoning router.
"""

from __future__ import annotations

from datetime import date

import pytest
from fastapi import FastAPI
from fastapi.testclient import TestClient

from compliance.reasoning import (
    assess_interpretation,
    derive_obligations,
    discover_scope,
    normalize_claim,
    reason_implementation_claim,
)
from compliance.reasoning.enums import (
    ApplicabilityStatus,
    ClaimCoverage,
    InterpretationVerdict,
)
from compliance.reasoning.schemas import ProductProfile
from compliance.reasoning.enums import ManufacturerRole


# ---------------------------------------------------------------------------
# Fixtures / builders
# ---------------------------------------------------------------------------
def sps_profile(**overrides) -> ProductProfile:
    base = dict(
        product_name="SPS mit HMI",
        product_type=["SPS", "HMI", "Schaltschrank"],
        has_software=True,
        has_remote_access=True,
        has_cloud_connection=True,
        eu_market=True,
        manufacturer_role=ManufacturerRole.MANUFACTURER,
    )
    base.update(overrides)
    return ProductProfile(**base)


def _reg_ids(scope, attr):
    return [getattr(r, "regulation_id") for r in getattr(scope, attr)]


# ---------------------------------------------------------------------------
# 1. Gilt CRA für eine SPS mit Fernwartung?
# ---------------------------------------------------------------------------
def test_cra_applies_to_sps_with_remote_access():
    scope = discover_scope(sps_profile())
    cra = [r for r in scope.applicable_regulations if r.regulation_id == "CRA"]
    assert cra and cra[0].applicability_status == ApplicabilityStatus.APPLICABLE
    assert cra[0].confidence.value == "high"
    assert any("digitale Elemente" in f or "Fernzugriff" in f for f in cra[0].trigger_facts) or cra[0].trigger_facts


# ---------------------------------------------------------------------------
# 2. Katalogprodukt 2027 weiter verkauft -> CRA gilt; "nur neue Produkte" zu eng
# ---------------------------------------------------------------------------
def test_cra_applies_to_finished_catalog_product():
    profile = sps_profile(placed_on_market_after=date(2027, 1, 1), lifecycle_phase="placing_on_market")
    scope = discover_scope(profile)
    assert "CRA" in _reg_ids(scope, "applicable_regulations")


def test_interpretation_only_new_products_is_too_narrow():
    result = assess_interpretation("Wir glauben, der CRA gilt nur für neue Produkte.")
    assert result.assessment == InterpretationVerdict.TOO_NARROW
    assert "CRA" in result.affected_regulations
    assert result.corrected_interpretation
    assert result.legal_basis_refs


# ---------------------------------------------------------------------------
# 3. Reicht eine SBOM allein? -> nein, nur teilweise
# ---------------------------------------------------------------------------
def test_sbom_alone_is_not_enough():
    resp = reason_implementation_claim(sps_profile(), "Wir haben SBOMs.")
    sbom = [m for m in resp.mappings if m.obligation_id == "sbom_creation"]
    assert sbom and sbom[0].claim_coverage == ClaimCoverage.POTENTIALLY_ADDRESSES
    # but other obligations are surfaced as gaps -> claim does not address everything
    assert any(m.claim_coverage != ClaimCoverage.POTENTIALLY_ADDRESSES for m in resp.mappings)
    assert "Nachweise" in resp.summary


# ---------------------------------------------------------------------------
# 4. Ist ein reaktiver Updateprozess ausreichend? -> nur teilweise
# ---------------------------------------------------------------------------
def test_reactive_update_process_is_partial():
    resp = reason_implementation_claim(
        sps_profile(), "Wir machen Updates, wenn Kunden Fehler melden."
    )
    upd = [m for m in resp.mappings if m.obligation_id == "provide_security_updates"]
    assert upd and upd[0].claim_coverage == ClaimCoverage.PARTIALLY_ADDRESSES
    assert "reactive" in resp.claim.qualifiers
    assert any("Schwachstellenüberwachung" in e for e in upd[0].missing_elements)


# ---------------------------------------------------------------------------
# 5. Wann überschneiden sich CRA und MaschinenVO?
# ---------------------------------------------------------------------------
def test_cra_and_machinery_overlap_on_cyber_safety():
    profile = sps_profile(is_machine=True, has_safety_function=True)
    resp = derive_obligations(profile)
    ids = [o.obligation_id for o in resp.applicable_obligations]
    assert "machine_protection_against_corruption" in ids
    assert "vuln_handling_process" in ids
    vuln_overlap = [o for o in resp.overlaps if o.overlap_group_id == "VULNERABILITY_HANDLING"]
    assert vuln_overlap
    assert "machine_protection_against_corruption" in vuln_overlap[0].obligations


# ---------------------------------------------------------------------------
# 6. Wann ist Data Act zusätzlich relevant?
# ---------------------------------------------------------------------------
def test_data_act_relevant_when_product_generates_data():
    scope = discover_scope(sps_profile(generates_usage_data=True))
    assert "DataAct" in _reg_ids(scope, "applicable_regulations")
    obs = derive_obligations(sps_profile(generates_usage_data=True))
    assert any(o.source_regulation == "DataAct" for o in obs.applicable_obligations)


def test_data_act_uncertain_when_data_unknown():
    scope = discover_scope(sps_profile())  # generates_usage_data=None
    assert "DataAct" in _reg_ids(scope, "uncertain_regulations")


# ---------------------------------------------------------------------------
# 7. Welche Pflichten gelten nicht ohne Funkmodul?
# ---------------------------------------------------------------------------
def test_no_radio_module_excludes_red():
    scope = discover_scope(sps_profile(has_radio_module=False))
    assert "RED" in _reg_ids(scope, "excluded_regulations")
    assert "RED" not in _reg_ids(scope, "applicable_regulations")


def test_radio_unknown_makes_red_uncertain():
    scope = discover_scope(sps_profile())  # has_radio_module=None
    assert "RED" in _reg_ids(scope, "uncertain_regulations")


# ---------------------------------------------------------------------------
# 8. Welche Fakten fehlen für eine NIS2-Bewertung?
# ---------------------------------------------------------------------------
def test_nis2_missing_facts():
    scope = discover_scope(sps_profile())
    nis2 = [r for r in scope.uncertain_regulations if r.regulation_id == "NIS2"]
    assert nis2
    joined = " ".join(nis2[0].missing_facts).lower()
    assert "unternehmensgröße" in joined and "sektor" in joined


# ---------------------------------------------------------------------------
# 9. Welche Nachweise decken mehrere Pflichten gleichzeitig? (USP)
# ---------------------------------------------------------------------------
def test_evidence_covers_multiple_obligations():
    resp = derive_obligations(sps_profile())
    multi = resp.evidence_for_multiple
    assert multi  # at least one evidence type spans >1 obligation
    assert all(len(ids) > 1 for ids in multi.values())
    assert "policy" in multi  # the CRA process docs share a policy evidence


# ---------------------------------------------------------------------------
# 10. Auslegungen: zu eng / zu weit / plausibel / unbekannt
# ---------------------------------------------------------------------------
def test_interpretation_unknown_returns_uncertain():
    result = assess_interpretation("Der Mond beeinflusst unsere Updatezyklen.")
    assert result.assessment == InterpretationVerdict.UNCERTAIN
    assert result.corrected_interpretation


def test_interpretation_open_source_partially_correct():
    result = assess_interpretation("Open Source ist ausgenommen, also betrifft uns der CRA nicht.")
    assert result.assessment == InterpretationVerdict.PARTIALLY_CORRECT


# ---------------------------------------------------------------------------
# Registry-alignment + contract guards
# ---------------------------------------------------------------------------
def test_cra_obligations_reuse_registry_ids_not_minted():
    resp = derive_obligations(sps_profile())
    anchored = [o for o in resp.applicable_obligations if o.registry_anchor]
    assert "sbom_creation" in [o.obligation_id for o in anchored]
    assert "provide_security_updates" in [o.obligation_id for o in anchored]
    # machine obligations are proposed, never claimed as registry-owned
    machine = [o for o in resp.applicable_obligations if o.source_regulation == "MaschinenVO"]
    assert all(o.proposed and not o.registry_anchor for o in machine)


def test_required_evidence_only_uses_shared_catalog():
    from compliance.reasoning.rules_types import EVIDENCE_CATALOG
    from compliance.reasoning.rules_obligations import ALL_OBLIGATIONS

    for rule in ALL_OBLIGATIONS:
        assert set(rule.required_evidence) <= EVIDENCE_CATALOG


def test_claim_normalizer_is_deterministic():
    a = normalize_claim("Wir haben einen Update-Prozess.")
    b = normalize_claim("Wir haben einen Update-Prozess.")
    assert a.claim_id == b.claim_id
    assert "secure_updates" in a.claimed_capability


def test_unspecific_claim_asks_for_detail():
    resp = reason_implementation_claim(sps_profile(), "Wir sind sicher aufgestellt.")
    assert resp.mappings == [] or all(
        m.claim_coverage == ClaimCoverage.INSUFFICIENT_INFORMATION for m in resp.mappings
    )
    assert "unspezifisch" in resp.summary.lower()


def test_claim_reasoning_carries_no_compliance_verdict():
    """Welt-1 boundary: claim mapping must never read as a conformity verdict."""
    resp = reason_implementation_claim(
        sps_profile(), "Wir haben SBOMs und einen Update-Prozess."
    )
    # claim-relative vocabulary only
    for m in resp.mappings:
        assert m.claim_coverage in set(ClaimCoverage)
    # no compliance wording leaks into summary or explanations
    assert "erfüllt" not in resp.summary
    assert all("erfüllt" not in m.explanation for m in resp.mappings)
    # explicit disclaimer separating ClaimCoverage (Welt 1) from ComplianceStatus (Welt 2)
    assert resp.disclaimer
    assert "ComplianceStatus" in resp.disclaimer and "Nachweis" in resp.disclaimer


# ---------------------------------------------------------------------------
# Endpoint smoke tests
# ---------------------------------------------------------------------------
@pytest.fixture(scope="module")
def client():
    from compliance.api.reasoning_routes import router

    app = FastAPI()
    app.include_router(router)
    return TestClient(app)


def test_endpoint_scope(client):
    r = client.post("/reasoning/scope", json={"product_profile": {"product_name": "X", "has_software": True, "eu_market": True, "manufacturer_role": "manufacturer"}})
    assert r.status_code == 200
    body = r.json()
    assert "CRA" in [x["regulation_id"] for x in body["regulatory_scope"]["applicable_regulations"]]


def test_endpoint_obligations(client):
    r = client.post(
        "/reasoning/obligations",
        json={"product_profile": {"product_name": "X", "has_software": True, "has_remote_access": True, "eu_market": True, "manufacturer_role": "manufacturer"}},
    )
    assert r.status_code == 200
    assert r.json()["applicable_obligations"]


def test_endpoint_implementation(client):
    r = client.post(
        "/reasoning/implementation-reasoning",
        json={"product_profile": {"product_name": "X", "has_software": True, "eu_market": True, "manufacturer_role": "manufacturer"}, "customer_claim": "Wir haben SBOMs."},
    )
    assert r.status_code == 200
    body = r.json()
    assert body["mappings"]
    assert body["disclaimer"]


def test_endpoint_interpretation(client):
    r = client.post(
        "/reasoning/interpretation-assessment",
        json={"customer_interpretation": "CRA gilt nur für neue Produkte."},
    )
    assert r.status_code == 200
    assert r.json()["assessment"] == "too_narrow"