import cadence
from cadence import Segment, Word


def test_generate_combined_transcripts(make_track, tmp_path):
    td = make_track(
        name="video.mp4",
        duration=2.0,
        timeline=[Segment(0.0, 2.0, "keep")],
        words=[Word("Hello.", 0.2, 0.5), Word("world.", 0.6, 0.9)],
    )
    out = tmp_path / "captions"

    cadence.generate_combined_transcripts([td], out)

    srt = out.with_suffix(".srt")
    assert srt.exists()
    assert srt.stat().st_size > 0

    llm_transcript = out.with_name(f"{out.stem}_llm_transcript.txt")
    assert llm_transcript.exists()
    assert llm_transcript.stat().st_size > 0

    # Atomic writes must not leave temp files behind.
    assert not list(tmp_path.glob("*.tmp"))