"""Tests for scripts.twitter_threads.download_media: naming and HTTP download contract."""
from __future__ import annotations

from pathlib import Path
from unittest.mock import patch, MagicMock
from urllib.error import URLError

import pytest

from scripts.twitter_threads.error_types import PostMetrics, PostData, ThreadData
from scripts.twitter_threads.download_media import media_names_for_post, download_media


class _FakeResp:
 def __init__(self, data: bytes) -> None:
  self._data = data
 def read(self) -> bytes:
  return self._data
 def __enter__(self) -> "_FakeResp":
  return self
 def __exit__(self, *a: object) -> bool:
  return False


def _post(post_id: str, media_urls: tuple[str, ...]) -> PostData:
 metrics = PostMetrics(reply_count=0, repost_count=0, like_count=0, view_count=None)
 return PostData(post_id=post_id, author="Tim", handle="NOTimothyLottes", text="t", timestamp="2024-02-01T00:00:00Z", media_urls=media_urls, reply_to_id=None, quote_of_id=None, metrics=metrics)


def test_media_names_for_post() -> None:
 post = _post("123", ("https://pbs.twimg.com/media/A?format=jpg&name=large", "https://pbs.twimg.com/media/B?format=png&name=large"))
 assert media_names_for_post(post) == ["123_img1.jpg", "123_img2.png"]


def test_media_names_video() -> None:
 post = _post("123", ("https://video.twimg.com/ext_tw_video/1/pu/vid/1280x720/1234567890.mp4",))
 assert media_names_for_post(post) == ["123_vid1.mp4"]


def test_download_naming(tmp_path: Path) -> None:
 post = _post("123", ("https://pbs.twimg.com/media/A?format=jpg&name=large", "https://pbs.twimg.com/media/B?format=png&name=large"))
 thread = ThreadData(root_post_id="123", posts=(post,), source_url="https://x.com/x/x/123")
 with patch("scripts.twitter_threads.download_media.urlopen", return_value=_FakeResp(b"bytes")):
  result = download_media(thread, tmp_path)
 assert result.is_ok
 assert (tmp_path / "123_img1.jpg").exists()
 assert (tmp_path / "123_img2.png").exists()
 assert result.data is not None
 names = [p.name for p in result.data]
 assert "123_img1.jpg" in names
 assert "123_img2.png" in names


def test_download_video_naming(tmp_path: Path) -> None:
 post = _post("123", ("https://video.twimg.com/ext_tw_video/1/pu/vid/1280x720/1234567890.mp4",))
 thread = ThreadData(root_post_id="123", posts=(post,), source_url="https://x.com/x/x/123")
 with patch("scripts.twitter_threads.download_media.urlopen", return_value=_FakeResp(b"vid")):
  result = download_media(thread, tmp_path)
 assert (tmp_path / "123_vid1.mp4").exists()


def test_download_idempotent(tmp_path: Path) -> None:
 post = _post("123", ("https://pbs.twimg.com/media/A?format=jpg&name=large",))
 thread = ThreadData(root_post_id="123", posts=(post,), source_url="https://x.com/x/x/123")
 name = media_names_for_post(post)[0]
 (tmp_path / name).write_bytes(b"already")
 mock_urlopen = MagicMock()
 with patch("scripts.twitter_threads.download_media.urlopen", mock_urlopen):
  result = download_media(thread, tmp_path)
 assert result.is_ok
 mock_urlopen.assert_not_called()
 assert (tmp_path / name).read_bytes() == b"already"


def test_download_http_error(tmp_path: Path) -> None:
 post = _post("123", ("https://pbs.twimg.com/media/A?format=jpg&name=large",))
 thread = ThreadData(root_post_id="123", posts=(post,), source_url="https://x.com/x/x/123")
 with patch("scripts.twitter_threads.download_media.urlopen", side_effect=URLError("boom")):
  result = download_media(thread, tmp_path)
 assert result.is_ok is False
 assert result.error is not None
 assert result.error.kind == "HttpError"