import io, numpy as np, soundfile as sf, pytest
from unittest.mock import MagicMock, patch

def make_wav(duration=30.0, sr=22050) -> bytes:
    t = np.linspace(0, duration, int(sr * duration))
    y = (np.sin(2 * np.pi * 440 * t) * 0.5).astype(np.float32)
    buf = io.BytesIO()
    sf.write(buf, y, sr, format="WAV")
    return buf.getvalue()

@pytest.fixture
def client():
    import app.main as main_module
    from fastapi.testclient import TestClient

    mock_enc = MagicMock()
    mock_enc.encode_batch.return_value = np.random.randn(11, 768)
    with patch("app.main.MERTEncoder", return_value=mock_enc):
        # Reset cached encoder so get_encoder() calls the patched MERTEncoder()
        main_module._encoder = None
        yield TestClient(main_module.app)
    # Cleanup: reset encoder after test
    main_module._encoder = None

def test_analyze_200(client):
    r = client.post("/analyze", files={"file": ("t.wav", make_wav(), "audio/wav")})
    assert r.status_code == 200

def test_response_structure(client):
    data = client.post("/analyze", files={"file": ("t.wav", make_wav(), "audio/wav")}).json()
    assert {"segments","duration","dominant_key","dominant_mode"} <= data.keys()
    assert len(data["segments"]) > 0

def test_segment_has_guitar_info(client):
    seg = client.post("/analyze", files={"file": ("t.wav", make_wav(), "audio/wav")}).json()["segments"][0]
    assert len(seg["scale_notes"]) == 7
    assert len(seg["pentatonic_notes"]) == 5
    assert len(seg["fretboard_positions"]) > 0

def test_rejects_non_audio(client):
    r = client.post("/analyze", files={"file": ("t.txt", b"nope", "text/plain")})
    assert r.status_code == 422