# tests/test_export_service.py — unit tests for export stitch service
from __future__ import annotations

import pytest


@pytest.mark.asyncio
async def test_stitch_single_file(tmp_path):
    """Single file: should copy without invoking ffmpeg."""
    from app.services.export import stitch

    src = tmp_path / "segment.wav"
    src.write_bytes(b"WAV DATA")
    out = str(tmp_path / "output.wav")

    result = await stitch([str(src)], out)
    assert result == out
    assert open(out, "rb").read() == b"WAV DATA"


@pytest.mark.asyncio
async def test_stitch_empty_raises(tmp_path):
    from app.services.export import stitch

    with pytest.raises(ValueError, match="No audio paths"):
        await stitch([], str(tmp_path / "out.wav"))


def test_make_export_path():
    from app.services.export import make_export_path

    p = make_export_path("data", "chain-abc", "mp3")
    assert p == "data/chains/chain-abc/export.mp3"
    assert make_export_path("data", "chain-abc", "wav").endswith(".wav")