"""Public-surface contract tests for the AZ-408 injector dataclasses.

AZ-406 commits to module locations; AZ-408 owns the concrete dataclass
shapes. These tests assert the API surface (frozen dataclasses, public
``build()`` functions returning typed reports). Behavioural tests live
in their own files (``test_outlier.py``, ``test_blackout_spoof.py``,
``test_multi_segment.py``, ``test_fc_proxy.py``).
"""

from __future__ import annotations

from pathlib import Path

import pytest

from fixtures.injectors.blackout_spoof import BlackoutSpoofPlan, BlackoutSpoofReport
from fixtures.injectors.cold_boot import ColdBootFixture
from fixtures.injectors.cold_boot import load as load_cold_boot
from fixtures.injectors.fc_proxy import BlackoutSpoofProxy, SpoofGpsRecord
from fixtures.injectors.multi_segment import MultiSegmentPlan, MultiSegmentReport
from fixtures.injectors.outlier import OutlierInjectionPlan, OutlierInjectionReport


def test_outlier_plan_dataclass_is_frozen() -> None:
    # Arrange
    plan = OutlierInjectionPlan(
        source_frames_dir=Path("/tmp/frames"),
        tile_cache_dir=Path("/tmp/tile-cache"),
        density="medium",
    )
    # Act / Assert
    with pytest.raises(AttributeError):
        plan.density = "heavy"  # type: ignore[misc]
    assert plan.min_offset_m == 350.0


def test_outlier_plan_density_literal_round_trip() -> None:
    # Arrange / Act
    for density in ("light", "medium", "heavy"):
        plan = OutlierInjectionPlan(
            source_frames_dir=Path("/tmp"),
            tile_cache_dir=Path("/tmp"),
            density=density,  # type: ignore[arg-type]
        )
        # Assert
        assert plan.density == density


def test_outlier_report_is_frozen_dataclass() -> None:
    # Arrange
    report = OutlierInjectionReport(
        out_root=Path("/tmp/out"),
        total_source_frames=100,
        replaced_frame_count=10,
        density="medium",
        min_geodesic_offset_m=400.0,
        max_geodesic_offset_m=900.0,
    )
    # Act / Assert
    with pytest.raises(AttributeError):
        report.replaced_frame_count = 20  # type: ignore[misc]


def test_blackout_spoof_plan_round_trip() -> None:
    # Arrange / Act
    plan = BlackoutSpoofPlan(
        source_frames_dir=Path("/tmp/frames"),
        blackout_seconds=35.0,
        spoof_offset_m=120.0,
        spoof_bearing_deg=90.0,
    )
    # Assert
    assert plan.blackout_seconds == 35.0
    assert plan.max_alignment_err_ms == 40.0  # default per AC-3


def test_blackout_spoof_report_is_frozen_dataclass() -> None:
    # Arrange
    proxy = BlackoutSpoofProxy(window_start_ms=0, window_end_ms=1000, spoof_gps=[])
    # Assert that the report type is constructible (smoke check)
    assert proxy.activation_report is None


def test_multi_segment_plan_defaults() -> None:
    # Arrange / Act
    plan = MultiSegmentPlan(source_frames_dir=Path("/tmp/frames"))
    # Assert
    assert plan.n_segments == 3
    assert plan.segment_seconds == 12.0


def test_multi_segment_report_is_frozen_dataclass() -> None:
    # Arrange
    report = MultiSegmentReport(
        out_root=Path("/tmp/out"),
        segments=[],
        source_duration_ms=300_000,
        total_blackout_frames=300,
        total_blackout_fraction=0.10,
    )
    # Act / Assert
    with pytest.raises(AttributeError):
        report.source_duration_ms = 0  # type: ignore[misc]


def test_spoof_gps_record_is_frozen_dataclass() -> None:
    # Arrange
    rec = SpoofGpsRecord(
        monotonic_ms=1000,
        lat_deg=50.1,
        lon_deg=36.2,
        alt_m=300.0,
        fix_type=3,
        hdop=1.0,
    )
    # Act / Assert
    with pytest.raises(AttributeError):
        rec.lat_deg = 0.0  # type: ignore[misc]


# Cold-boot tests are unchanged from AZ-406 — the cold-boot loader is
# still owned by AZ-419, not AZ-408.


def test_cold_boot_fixture_dataclass_is_frozen() -> None:
    # Arrange
    fx = ColdBootFixture(
        lat_deg=50.0, lon_deg=30.0, alt_m=300.0, yaw_deg=180.0, last_valid_fix_age_s=2.5
    )
    # Act / Assert
    with pytest.raises(AttributeError):
        fx.alt_m = 999.0  # type: ignore[misc]


def test_cold_boot_load_raises_until_az419_lands(tmp_path: Path) -> None:
    # Arrange
    fixture_path = tmp_path / "cold_boot_fixture.json"
    fixture_path.write_text("{}", encoding="utf-8")
    # Act / Assert
    with pytest.raises(NotImplementedError, match="AZ-419"):
        load_cold_boot(fixture_path)