"""Stance must degrade gracefully and score in the intuitive direction."""
import numpy as np

from witnessbox import stance
from witnessbox.stance import analyze, _score


def test_silence_is_neutral_low_certainty():
    y = np.zeros(16000, dtype=np.float32)
    r = analyze(y, 16000)
    assert r.tier == "NEUTRAL" and r.certainty < 0.5


def test_empty_and_none_are_neutral():
    assert analyze(np.array([], dtype=np.float32), 16000).tier == "NEUTRAL"
    assert analyze(None, 16000).tier == "NEUTRAL"


def test_always_returns_valid_result():
    y = (0.2 * np.random.RandomState(0).randn(16000)).astype(np.float32)
    r = analyze(y, 16000)
    assert r.tier in {"CONFIDENT", "NEUTRAL", "HESITANT"}
    assert 0.0 <= r.confidence <= 100.0


def test_score_direction():
    # Fluent + steady should read more confident than halting + swooping.
    fluent, _ = _score(pause_ratio=0.10, rate_hz=4.2, pitch_std_semitones=1.0)
    halting, _ = _score(pause_ratio=0.60, rate_hz=1.5, pitch_std_semitones=5.5)
    assert fluent > halting
    assert stance._tier(fluent) == "CONFIDENT"
    assert stance._tier(halting) == "HESITANT"