from pathlib import Path

import pytest

from repub.config import feed_output_path, staged_feed_output_path
from repub.postprocessing import publish_staged_feed

VALID_FEED = '<rss version="2.0"><channel><title>new</title></channel></rss>\n'


def test_publish_staged_feed_replaces_public_feed(tmp_path: Path) -> None:
    out_dir = tmp_path / "out"
    public_path = feed_output_path(out_dir=out_dir, feed_slug="demo")
    staged_path = staged_feed_output_path(out_dir=out_dir, feed_slug="demo")
    public_path.parent.mkdir(parents=True)
    public_path.write_text("<rss>old</rss>\n", encoding="utf-8")
    staged_path.write_text(VALID_FEED, encoding="utf-8")

    published_path = publish_staged_feed(out_dir=out_dir, feed_slug="demo")

    assert published_path == public_path
    assert public_path.read_text(encoding="utf-8") == VALID_FEED
    assert not staged_path.exists()


def test_publish_staged_feed_requires_staged_file(tmp_path: Path) -> None:
    with pytest.raises(FileNotFoundError):
        publish_staged_feed(out_dir=tmp_path / "out", feed_slug="missing")


@pytest.mark.parametrize(
    "staged_feed",
    [
        '<rss version="2.0"/>\n',
        '<rss version="2.0"><channel></rss>\n',
    ],
)
def test_publish_staged_feed_rejects_unusable_feed(
    tmp_path: Path, staged_feed: str
) -> None:
    out_dir = tmp_path / "out"
    public_path = feed_output_path(out_dir=out_dir, feed_slug="demo")
    staged_path = staged_feed_output_path(out_dir=out_dir, feed_slug="demo")
    public_path.parent.mkdir(parents=True)
    public_path.write_text("<rss>old</rss>\n", encoding="utf-8")
    staged_path.write_text(staged_feed, encoding="utf-8")

    with pytest.raises(ValueError):
        publish_staged_feed(out_dir=out_dir, feed_slug="demo")

    assert public_path.read_text(encoding="utf-8") == "<rss>old</rss>\n"
    assert staged_path.read_text(encoding="utf-8") == staged_feed