"""Env-flagged low-latency knobs (hop/queue, hold, enhance scope)."""
from latency import (
    audio_queue_size_ms,
    effective_enhance_mode,
    video_hold_seconds,
    video_stream_kwargs,
)


def test_audio_queue_defaults_to_legacy_floor():
    assert audio_queue_size_ms(0.1, audio_queue_ms=None) == 150
    assert audio_queue_size_ms(0.2, audio_queue_ms=None) == 250


def test_audio_queue_env_overrides_floor():
    assert audio_queue_size_ms(0.1, audio_queue_ms=60) == 60
    assert audio_queue_size_ms(0.05, audio_queue_ms=60) == 60


def test_video_hold_matches_hop_when_audio_present():
    assert video_hold_seconds(0.1, has_audio=True, video_hold_s=None) == 0.1
    assert video_hold_seconds(0.05, has_audio=True, video_hold_s=None) == 0.05


def test_video_hold_zero_without_audio():
    assert video_hold_seconds(0.1, has_audio=False, video_hold_s=None) == 0.0
    assert video_hold_seconds(0.1, has_audio=False, video_hold_s=0.2) == 0.0


def test_video_hold_env_overrides_including_zero():
    assert video_hold_seconds(0.1, has_audio=True, video_hold_s=0.0) == 0.0
    assert video_hold_seconds(0.1, has_audio=True, video_hold_s=0.05) == 0.05


def test_enhance_speaker_only_rally_disables_c920s():
    assert effective_enhance_mode(
        "auto", "cam-01", speaker_only=True, speaker_camera="rally",
    ) == "off"
    assert effective_enhance_mode(
        "auto", "rally", speaker_only=True, speaker_camera="rally",
    ) == "auto"


def test_enhance_speaker_only_inactive_leaves_mode():
    assert effective_enhance_mode(
        "auto", "cam-07", speaker_only=False, speaker_camera="cam-01",
    ) == "auto"


def test_enhance_speaker_only_ignored_when_speaker_is_active():
    assert effective_enhance_mode(
        "auto", "cam-07", speaker_only=True, speaker_camera="active",
    ) == "auto"


def test_video_stream_legacy_unbounded_native():
    assert video_stream_kwargs(capacity=0, format_name="") == {}


def test_video_stream_latest_bgra():
    assert video_stream_kwargs(capacity=1, format_name="bgra") == {
        "capacity": 1,
        "format": "bgra",
    }