//! Verification tests. These run against the host audio stack and
//! therefore live behind the `audio-hardware` opt-in feature for CI
//! environments without a usable audio device. Without the feature
//! they fall back to a pure-software synth+WAV round-trip that does
//! not touch cpal.

use std::time::Duration;

use audio_capture_playback_spike::synth_sine_wav;

#[test]
fn synth_produces_valid_wav_with_expected_frame_count() {
    let tmp = tempfile::tempdir().unwrap();
    let path = tmp.path().join("sine.wav");
    let (frames, sr) =
        synth_sine_wav(&path, 440.0, Duration::from_millis(500), 48_000).unwrap();
    assert_eq!(sr, 48_000);
    // 0.5 s × 48 kHz = 24 000 frames (mono).
    assert!(frames >= 23_900 && frames <= 24_100, "got {frames}");

    let reader = hound::WavReader::open(&path).unwrap();
    let spec = reader.spec();
    assert_eq!(spec.channels, 1);
    assert_eq!(spec.sample_rate, 48_000);
    assert_eq!(spec.bits_per_sample, 16);
    assert_eq!(reader.len(), frames as u32);
}

#[test]
fn synth_then_playback_does_not_error_when_output_device_present() {
    use audio_capture_playback_spike::AudioPlayback;
    use cpal::traits::HostTrait;

    // Skip on hosts with no output device. The PoC's exit criterion
    // is satisfied by the verification CLI run captured in
    // VERIFICATION.md; this test is a CI sanity check.
    if cpal::default_host().default_output_device().is_none() {
        eprintln!("SKIP: no default output device");
        return;
    }

    let tmp = tempfile::tempdir().unwrap();
    let path = tmp.path().join("sine.wav");
    synth_sine_wav(&path, 440.0, Duration::from_millis(120), 48_000).unwrap();
    AudioPlayback::play_wav(&path).expect("playback round-trip should not error");
}