"""Bar phase (beat-in-bar) tracking for audio beat detection."""

import os
import sys

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

from tests.beat_detect import BarPhaseTracker  # noqa: E402


def test_bar_phase_increments_on_non_kick_beats():
    tr = BarPhaseTracker(beats_per_bar=4)
    r1 = tr.on_beat(1.0, "snare", 1.3, bpm=120.0)
    assert r1["bar_beat"] == 1
    r2 = tr.on_beat(1.5, "snare", 1.2, bpm=120.0)
    assert r2["bar_beat"] == 2
    r3 = tr.on_beat(2.0, "hat", 1.1, bpm=120.0)
    assert r3["bar_beat"] == 3


def test_kick_near_bar_boundary_resets_to_downbeat():
    tr = BarPhaseTracker(beats_per_bar=4)
    tr.on_beat(0.0, "kick", 1.4, bpm=120.0)
    tr.on_beat(0.5, "snare", 1.2, bpm=120.0)
    tr.on_beat(1.0, "snare", 1.2, bpm=120.0)
    tr.on_beat(1.5, "snare", 1.2, bpm=120.0)
    r = tr.on_beat(2.0, "kick", 1.5, bpm=120.0)
    assert r["bar_beat"] == 1
    assert r["is_downbeat"] is True


def test_anchor_downbeat_sets_confidence():
    tr = BarPhaseTracker(beats_per_bar=4)
    tr.anchor_downbeat(10.0)
    assert tr.bar_beat == 1
    assert tr.confidence >= 0.85


def test_reset_tempo_preserves_bar_phase():
    from argparse import Namespace

    from tests.beat_detect import BeatDetectRuntime  # noqa: E402

    args = Namespace(
        mode="custom",
        hop_size=256,
        win_mult=2,
        min_band_hz=45.0,
        max_band_hz=180.0,
        energy_weight=0.7,
        flux_weight=0.3,
        threshold_multiplier=1.35,
        ema_alpha=0.08,
        min_ioi_ms=100.0,
        bpm_window=8,
        aubio_method="default",
        aubio_threshold=0.12,
        beats_per_bar=4,
    )
    rt = BeatDetectRuntime(args)
    rt.setup(44100)
    rt.bar_phase.on_beat(0.0, "kick", 1.5, bpm=120.0)
    rt.bar_phase.on_beat(0.5, "snare", 1.2, bpm=120.0)
    assert rt.bar_phase.bar_beat == 2
    rt.reset_tempo_state()
    assert rt.bar_phase.bar_beat == 2
    rt.reset_state()
    assert rt.bar_phase.bar_beat == 1