"""Unit tests for `ui_components.py` helpers.

These tests avoid any network or Streamlit runtime dependencies.
"""
import base64
import io

from ui_components import (
    detect_audio_media_type,
    ext_for_media_type,
    infer_download_filename,
    format_result_for_display,
)


def _make_wav_bytes(sample_rate=8000, seconds=1):
    import wave, struct

    n = sample_rate * seconds
    buf = io.BytesIO()
    with wave.open(buf, "wb") as wf:
        wf.setnchannels(1)
        wf.setsampwidth(2)
        wf.setframerate(sample_rate)
        wf.writeframes(struct.pack(f"<{n}h", *([0] * n)))
    return buf.getvalue()


def test_detect_wav():
    wav = _make_wav_bytes()
    assert detect_audio_media_type(wav) == "audio/wav"


def test_detect_ogg():
    data = b"OggS" + b"\x00" * 16
    assert detect_audio_media_type(data) == "audio/ogg"


def test_detect_mp3_by_id3():
    data = b"ID3" + b"\x00" * 8
    assert detect_audio_media_type(data) == "audio/mpeg"


def test_ext_mapping():
    assert ext_for_media_type("audio/wav") == ".wav"
    assert ext_for_media_type("audio/ogg") == ".ogg"
    assert ext_for_media_type("audio/mpeg") == ".mp3"


def test_infer_filename():
    assert infer_download_filename("req-123", "audio/wav") == "req-123.wav"


def test_format_result_for_display_minimal():
    r = {"summary": "S", "word_count": 10}
    out = format_result_for_display(r)
    assert out["summary"] == "S"
    assert out["word_count"] == 10
    assert out["transcript"] == ""