"""FOUND-04 class coverage test.

Every one of the 10 disconnect classes has a registered generator emitting
>=1 frame whose dict matches the TelemetryFrame field names.
"""
from __future__ import annotations

from numpy.random import PCG64, Generator

from model.synth.state_machines import GENERATORS

EXPECTED_CLASSES: frozenset[str] = frozenset({
    "auth_8021x_eap_fail",
    "ap_roam_rekey_fail",
    "radius_timeout",
    "captive_portal_expiry",
    "mac_randomization_reject",
    "dhcp_lease_churn",
    "dns_resolver_fail",
    "driver_power_save_wake",
    "rf_sticky_client",
    "isp_upstream_fail",
})

CANONICAL_ORDER = [
    "auth_8021x_eap_fail",
    "ap_roam_rekey_fail",
    "radius_timeout",
    "captive_portal_expiry",
    "mac_randomization_reject",
    "dhcp_lease_churn",
    "dns_resolver_fail",
    "driver_power_save_wake",
    "rf_sticky_client",
    "isp_upstream_fail",
]


def test_all_ten_classes_registered():
    assert set(GENERATORS.keys()) == EXPECTED_CLASSES, (
        "GENERATORS must contain exactly the 10 canonical class slugs; "
        f"got {sorted(GENERATORS.keys())}"
    )


def test_generators_in_canonical_order():
    """Insertion order matters for byte-identicality (RESEARCH Pattern 4 Critical note)."""
    assert list(GENERATORS.keys()) == CANONICAL_ORDER


def test_each_class_emits_valid_frame(expected_field_names):
    rng = Generator(PCG64(42))
    for cls, fn in GENERATORS.items():
        frames = fn(rng)
        assert len(frames) >= 1, f"Class {cls} emitted zero frames"
        sample = frames[0]
        extra = set(sample.keys()) - expected_field_names
        missing = expected_field_names - set(sample.keys())
        assert not extra, f"Class {cls} emitted unknown fields: {extra}"
        assert not missing, f"Class {cls} missing required fields: {missing}"


def test_window_ms_per_class():
    """D-04: 30000 ms for fast events, 120000 ms for driver / sticky-client."""
    rng = Generator(PCG64(42))
    slow_classes = {"driver_power_save_wake", "rf_sticky_client"}
    for cls, fn in GENERATORS.items():
        sample = fn(rng)[0]
        expected_window = 120000 if cls in slow_classes else 30000
        assert sample["window_ms"] == expected_window, (
            f"Class {cls} window_ms={sample['window_ms']}, expected {expected_window} (D-04)"
        )