"""voice.py must be import-safe even without kokoro (the 3.13 test venv has
none): the DSP is pure numpy and testable; speak() degrades to None."""
import numpy as np

import voice


def test_dsp_functions_are_pure_numpy():
    x = np.sin(np.linspace(0, 20, 24000)).astype(np.float32)
    up = voice._pitch_up(x, 1.16)
    assert up.dtype == np.float32 and len(up) < len(x)   # pitch-up shortens
    fogged = voice._fog(x, intensity=0.28)
    assert np.max(np.abs(fogged)) <= 0.86                # normalized headroom


def test_speak_returns_none_when_pipeline_unavailable():
    # the 3.13 test venv has no kokoro -> _PIPELINE is None -> silent
    if voice._PIPELINE is None:
        assert voice.speak("the sea. i grew up near the sea.") is None


def test_speak_is_guarded_against_errors(monkeypatch):
    # even if a pipeline exists, a synth error must degrade to None, never raise
    monkeypatch.setattr(voice, "_PIPELINE", object())  # a bogus pipeline
    assert voice.speak("anything") is None


def test_clean_for_tts_strips_dashes():
    assert "—" not in voice._clean_for_tts("i don't— i don't remember")
    assert "-" not in voice._clean_for_tts("a well-kept secret")
    # collapses to single spaces, trims
    assert voice._clean_for_tts("a  —  b") == "a , b"