"""FT-N-04 — Visual blackout + spoofed GPS combined failsafe (AZ-426 / AC-3.5, AC-NEW-8).

Three sub-cases (5 s / 15 s / 35 s) at the ladder of windows
prescribed by AC-3.5 + AC-NEW-8, replayed via the AZ-408
``blackout_spoof`` injector + the FC-inbound spoof proxy, and
validated by ``runner.helpers.blackout_spoof_evaluator``.

Gated on the same upstream replay helpers as the other negative
scenarios (``frame_source_replay``, ``fdr_reader``,
``mavproxy_tlog_reader``, ``sitl_observer``, ``fc_proxy`` runtime
binding). When those helpers are still stubbed the scenario test
skips while
``e2e/_unit_tests/helpers/test_blackout_spoof_evaluator.py`` covers
the AC-1..AC-8 evaluator logic.
"""

from __future__ import annotations

from pathlib import Path

import pytest

from fixtures.injectors.blackout_spoof import BlackoutSpoofReport
from runner.helpers import blackout_spoof_evaluator as bse

_WINDOW_LADDER_S = (5.0, 15.0, 35.0)


@pytest.fixture(scope="module")
def _harness_helpers_implemented() -> bool:
    from runner.helpers import fdr_reader, mavproxy_tlog_reader, sitl_observer
    from runner.helpers.frame_source_replay import FrameSourceReplayer

    try:
        replayer = FrameSourceReplayer(sink=_NullSink())  # type: ignore[arg-type]
        try:
            replayer.replay_video(Path("/tmp/non-existent.mp4"))
        except NotImplementedError:
            return False
        try:
            list(fdr_reader.iter_records(Path("/tmp/non-existent")))
        except NotImplementedError:
            return False
        try:
            list(mavproxy_tlog_reader.iter_messages(Path("/tmp/non-existent.tlog")))
        except NotImplementedError:
            return False
        try:
            sitl_observer.read_gps_health_samples()  # type: ignore[attr-defined]
            sitl_observer.read_consistency_check_events()  # type: ignore[attr-defined]
        except (AttributeError, NotImplementedError):
            return False
        return True
    except Exception:
        return False


class _NullSink:
    def write_frame(self, jpeg_bytes: bytes, timestamp_ms: int) -> None:
        return None


@pytest.mark.parametrize(
    "blackout_spoof_derkachi",
    [{"window_seconds": s, "seed": 0} for s in _WINDOW_LADDER_S],
    indirect=True,
    ids=[f"{int(s)}s" for s in _WINDOW_LADDER_S],
)
@pytest.mark.traces_to(
    "AC-3.5,AC-NEW-8,AC-1,AC-2,AC-3,AC-4,AC-5,AC-6,AC-7,AC-8,AC-9"
)
def test_ft_n_04_blackout_spoof(
    fc_adapter: str,
    vio_strategy: str,
    blackout_spoof_derkachi: BlackoutSpoofReport,
    evidence_dir,  # type: ignore[no-untyped-def]
    run_id: str,
    nfr_recorder,  # type: ignore[no-untyped-def]
    _harness_helpers_implemented: bool,
) -> None:
    if not _harness_helpers_implemented:
        pytest.skip(
            "FT-N-04 full replay requires runner.helpers.{frame_source_replay,"
            "fdr_reader,mavproxy_tlog_reader,sitl_observer,fc_proxy} — currently "
            "AZ-441 / AZ-407 / AZ-416 leftovers. AC-1..AC-8 evaluator logic "
            "covered by e2e/_unit_tests/helpers/test_blackout_spoof_evaluator.py."
        )

    from runner.helpers import fdr_reader, mavproxy_tlog_reader, sitl_observer
    from runner.helpers.frame_source_replay import FrameSourceReplayer

    schedule = blackout_spoof_derkachi.schedule
    window = bse.BlackoutWindow(
        onset_monotonic_ms=schedule.window_start_ms,
        end_monotonic_ms=schedule.window_end_ms,
    )
    is_35s = abs(window.duration_s - 35.0) < 0.5

    # 1. Drive replay (frames + paired fc-proxy spoof injection).
    FrameSourceReplayer(_resolve_frame_sink()).replay_video(
        blackout_spoof_derkachi.out_root / "frames"
    )
    _drive_fc_proxy(blackout_spoof_derkachi.out_root / "schedule.json")

    # 2. Collect FDR estimates + spoof-rejected events.
    fdr_root = Path(evidence_dir).parent / f"run-{run_id}" / "fdr"
    estimates: list[bse.OutboundEstimateSample] = []
    spoof_events: list[bse.SpoofRejectedEvent] = []
    for rec in fdr_reader.iter_records(fdr_root):
        if rec.record_type == "outbound_estimate":
            p = rec.payload
            estimates.append(
                bse.OutboundEstimateSample(
                    monotonic_ms=int(rec.monotonic_ms),
                    source_label=str(p["source_label"]),  # type: ignore[arg-type]
                    cov_semi_major_m=float(p["cov_semi_major_m"]),  # type: ignore[arg-type]
                    horiz_accuracy=float(p.get("horiz_accuracy", p["cov_semi_major_m"])),  # type: ignore[arg-type]
                    fix_type=int(p.get("fix_type", -1)),  # type: ignore[arg-type]
                )
            )
        elif rec.record_type == "spoof_rejected":
            spoof_events.append(
                bse.SpoofRejectedEvent(
                    monotonic_ms=int(rec.monotonic_ms),
                    reason=str(rec.payload.get("reason", "")),  # type: ignore[arg-type]
                )
            )

    # 3. Collect STATUSTEXTs from mavproxy tlog.
    tlog_path = Path(evidence_dir).parent / f"run-{run_id}" / "mavproxy.tlog"
    statustexts = [
        bse.StatustextSample(
            monotonic_ms=int(m.timestamp_us // 1000),
            text=str(m.fields.get("text", "")),
        )
        for m in mavproxy_tlog_reader.iter_messages(tlog_path)
        if m.msg_type == "STATUSTEXT"
    ]

    # 4. Collect FC-side GPS health + consistency-check events (recovery gate).
    gps_health = [
        bse.GpsHealthSample(
            monotonic_ms=int(s.monotonic_ms),
            healthy=bool(s.healthy),
            spoofed=bool(s.spoofed),
        )
        for s in sitl_observer.read_gps_health_samples()  # type: ignore[attr-defined]
    ]
    consistency = [
        bse.ConsistencyCheckEvent(
            monotonic_ms=int(c.monotonic_ms), passed=bool(c.passed)
        )
        for c in sitl_observer.read_consistency_check_events()  # type: ignore[attr-defined]
    ]

    # 5. Evaluate.
    report = bse.evaluate(
        window,
        estimates=estimates,
        statustexts=statustexts,
        spoof_events=spoof_events,
        gps_health=gps_health,
        consistency_checks=consistency,
        frame_period_ms=_resolve_frame_period_ms(),
        is_35s_window=is_35s,
    )
    out_csv = (
        evidence_dir
        / f"ft-n-04-{int(window.duration_s)}s-{fc_adapter}-{vio_strategy}.csv"
    )
    bse.write_csv_evidence(out_csv, report)

    # 6. NFR metrics + AC assertions.
    nfr_recorder.record_metric(
        f"ft_n_04.{int(window.duration_s)}s.switch_latency_ms",
        float(report.switch_latency.first_dead_reckoned_offset_ms or 0),
        ac_id="AC-1",
    )
    nfr_recorder.record_metric(
        f"ft_n_04.{int(window.duration_s)}s.spoof_rejected_count",
        float(report.spoof_rejection.spoof_rejected_count),
        ac_id="AC-2",
    )
    nfr_recorder.record_metric(
        f"ft_n_04.{int(window.duration_s)}s.honest_accuracy_violation_count",
        float(report.honest_accuracy.violation_count),
        ac_id="AC-4",
    )
    if report.statustext_rate.observed_hz is not None:
        nfr_recorder.record_metric(
            f"ft_n_04.{int(window.duration_s)}s.statustext_imu_only_hz",
            report.statustext_rate.observed_hz,
            ac_id="AC-5",
        )
    if is_35s:
        nfr_recorder.record_metric(
            "ft_n_04.35s.cov2d_at_ms",
            float(report.escalation.cov2d_crossed_at_ms or 0),
            ac_id="AC-6",
        )
        nfr_recorder.record_metric(
            "ft_n_04.35s.failsafe_trigger_at_ms",
            float(report.escalation.cov500_or_30s_crossed_at_ms or 0),
            ac_id="AC-7",
        )

    assert report.switch_latency.passes, (
        f"AC-1: dead_reckoned label not within ≤{bse.SWITCH_LATENCY_MS} ms / "
        f"1 frame of blackout onset; "
        f"offset={report.switch_latency.first_dead_reckoned_offset_ms} ms, "
        f"frame_period={report.switch_latency.frame_period_ms} ms"
    )
    assert report.spoof_rejection.passes, (
        f"AC-2: spoof rejection failed; "
        f"rejected_count={report.spoof_rejection.spoof_rejected_count}, "
        f"re_anchored_count={report.spoof_rejection.satellite_anchored_inside_window}"
    )
    assert report.covariance_monotonic.passes, (
        f"AC-3: cov_semi_major_m decreased at "
        f"{report.covariance_monotonic.first_decreasing_at_ms} ms"
    )
    assert report.honest_accuracy.passes, (
        f"AC-4: horiz_accuracy under-reporting "
        f"({report.honest_accuracy.violation_count} violations of "
        f"{report.honest_accuracy.sample_count} samples)"
    )
    assert report.statustext_rate.passes, (
        f"AC-5: VISUAL_BLACKOUT_IMU_ONLY rate "
        f"{report.statustext_rate.observed_hz} Hz outside "
        f"[{bse.STATUSTEXT_RATE_MIN_HZ}, {bse.STATUSTEXT_RATE_MAX_HZ}] Hz"
    )
    if is_35s:
        assert report.escalation.passes_ac6, (
            f"AC-6: fix_type not degraded after cov crossed "
            f"{bse.ESCALATION_COV_2D_M} m at "
            f"{report.escalation.cov2d_crossed_at_ms} ms"
        )
        assert report.escalation.passes_ac7, (
            f"AC-7: failsafe escalation incomplete; "
            f"horiz_999={report.escalation.horiz_accuracy_999}, "
            f"failsafe_statustext_offset_ms="
            f"{report.escalation.failsafe_statustext_offset_ms}"
        )
    assert report.recovery_gate.passes, (
        f"AC-8: recovery gate failed; "
        f"recovery_at_ms={report.recovery_gate.recovery_at_ms}, "
        f"stable_period_s={report.recovery_gate.stable_period_s}, "
        f"consistency_check_passed={report.recovery_gate.consistency_check_passed}"
    )


def _resolve_frame_sink():  # type: ignore[no-untyped-def]
    raise NotImplementedError(
        "frame sink resolution is owned by AZ-441 / runner.helpers.frame_source_replay"
    )


def _drive_fc_proxy(schedule_path: Path) -> None:
    raise NotImplementedError(
        "FC-inbound spoof proxy driver is owned by AZ-441 / runner.helpers.fc_proxy_runtime"
    )


def _resolve_frame_period_ms() -> int:
    raise NotImplementedError(
        "Frame period resolution is owned by AZ-441 / runner.helpers.frame_source_replay"
    )