from __future__ import annotations

from pathlib import Path
from unittest.mock import MagicMock, patch

from scripts.video_analysis.download_video import (
 build_ydl_args,
 download_video,
 validate_output_path,
)


def test_validate_output_path_creates_parent(tmp_path: Path) -> None:
 out = tmp_path / "subdir" / "video.mp4"
 result = validate_output_path(out)
 assert result.is_ok()
 assert out.parent.exists()


def test_validate_output_path_rejects_existing_dir(tmp_path: Path) -> None:
 out = tmp_path / "existing_dir"
 out.mkdir()
 result = validate_output_path(out)
 assert result.is_err()


def test_build_ydl_args_basic(tmp_path: Path) -> None:
 out = tmp_path / "v.mp4"
 args = build_ydl_args("https://youtu.be/VID", out)
 assert "--output" in args
 assert str(out) in args
 assert "https://youtu.be/VID" in args


def test_download_video_success(tmp_path: Path) -> None:
 out = tmp_path / "video.mp4"
 out.write_bytes(b"fake-mp4-content")
 with patch("subprocess.run") as mock_run:
  mock_run.return_value = MagicMock(returncode=0, stdout="", stderr="")
  result = download_video("https://youtu.be/VID", out)
  assert result.is_ok()
  assert (tmp_path / "video.log").exists()


def test_download_video_failure(tmp_path: Path) -> None:
 out = tmp_path / "video.mp4"
 with patch("subprocess.run") as mock_run:
  mock_run.return_value = MagicMock(returncode=1, stdout="", stderr="ERROR: video unavailable")
  result = download_video("https://youtu.be/VID", out)
  assert result.is_err()