import os
import pytest
from unittest.mock import patch, MagicMock
from app.pipeline import video, thumb, storage


@pytest.fixture
def tmp_storage(monkeypatch, tmp_path):
    monkeypatch.setattr(storage, "VIDEO_DATA_DIR", str(tmp_path))
    # 더미 입력 파일들
    audio = tmp_path / "audio.mp3"
    audio.write_bytes(b"\x00" * 100)
    cover_dir = tmp_path / "50"
    cover_dir.mkdir()
    cover = cover_dir / "cover.jpg"
    cover.write_bytes(b"\x00" * 100)
    return tmp_path


@patch("subprocess.run")
def test_generate_video_calls_ffmpeg(mock_run, tmp_storage):
    mock_run.return_value = MagicMock(returncode=0, stderr="")
    out = video.generate(pipeline_id=50, audio_path=str(tmp_storage / "audio.mp3"),
                         cover_path=str(tmp_storage / "50" / "cover.jpg"),
                         genre="lo-fi", duration_sec=120, resolution="1920x1080",
                         style="visualizer")
    assert out["url"].endswith("/50/video.mp4")
    assert out["used_fallback"] is False
    args = mock_run.call_args[0][0]
    assert args[0] == "ffmpeg"
    assert "-i" in args
    assert "showwaves" in " ".join(args)


@patch("subprocess.run")
def test_generate_video_failure_marks_failed(mock_run, tmp_storage):
    mock_run.return_value = MagicMock(returncode=1, stderr="bad codec")
    with pytest.raises(video.VideoGenerationError):
        video.generate(pipeline_id=51, audio_path=str(tmp_storage / "audio.mp3"),
                        cover_path=str(tmp_storage / "50" / "cover.jpg"),
                        genre="lo-fi", duration_sec=120, resolution="1920x1080",
                        style="visualizer")


@patch("subprocess.run")
def test_thumb_extracts_frame(mock_run, tmp_storage):
    mock_run.return_value = MagicMock(returncode=0, stderr="")
    video_path = tmp_storage / "60" / "video.mp4"
    video_path.parent.mkdir()
    video_path.write_bytes(b"\x00" * 100)
    out = thumb.generate(pipeline_id=60, video_path=str(video_path),
                          track_title="Midnight Drive", overlay_text=False)
    assert out["url"].endswith("/60/thumbnail.jpg")
    args = mock_run.call_args[0][0]
    assert args[0] == "ffmpeg"


@patch("subprocess.run")
def test_thumb_failure_raises(mock_run, tmp_storage):
    mock_run.return_value = MagicMock(returncode=1, stderr="bad input")
    video_path = tmp_storage / "61" / "video.mp4"
    video_path.parent.mkdir()
    video_path.write_bytes(b"\x00" * 100)
    with pytest.raises(thumb.ThumbGenerationError):
        thumb.generate(pipeline_id=61, video_path=str(video_path),
                        track_title="X", overlay_text=False)