"""BPM clamp helpers."""

import os
import sys

PROJECT_ROOT = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
SRC_PATH = os.path.join(PROJECT_ROOT, "src")
if SRC_PATH not in sys.path:
    sys.path.insert(0, SRC_PATH)

from util.audio_detector import AudioBeatDetector  # noqa: E402
from util.bpm_limits import (
    BPM_MAX,
    BPM_MIN,
    clamp_bpm,
    clamp_bpm_optional,
    max_beat_interval_s,
    max_beat_min_ioi_ms,
    min_beat_interval_s,
)


def test_clamp_bpm_bounds():
    assert clamp_bpm(120) == 120.0
    assert clamp_bpm(400) == float(BPM_MAX)
    assert clamp_bpm(20) == float(BPM_MIN)


def test_clamp_bpm_optional():
    assert clamp_bpm_optional(None) is None
    assert clamp_bpm_optional(0) is None
    assert clamp_bpm_optional(350) == float(BPM_MAX)


def test_beat_interval_bounds():
    assert abs(min_beat_interval_s() - 60.0 / BPM_MAX) < 1e-9
    assert abs(max_beat_interval_s() - 60.0 / BPM_MIN) < 1e-9
    assert abs(max_beat_min_ioi_ms() - 60_000.0 / BPM_MAX) < 1e-6


def test_status_clamps_high_bpm():
    det = AudioBeatDetector()
    with det._lock:
        det._status["bpm"] = 350.0
    assert det.status()["bpm"] == float(BPM_MAX)