from datetime import datetime, timezone
from pathlib import Path
import sys
import unittest
import xml.etree.ElementTree as ET

sys.path.insert(0, str(Path(__file__).resolve().parents[1]))

from merge import FeedItem, build_rss, sort_and_limit


def item(title, link, hour, description=""):
    return FeedItem(
        title=title,
        link=link,
        guid=link,
        published=datetime(2026, 1, 1, hour, tzinfo=timezone.utc),
        description=description,
        source_title="Test Feed",
        source_url="https://example.com/feed.xml",
    )


class MergeTests(unittest.TestCase):
    def test_sorts_keeps_duplicates_and_limits(self):
        values = [
            item("Older", "https://example.com/old", 1),
            item("Newest", "https://example.com/new", 3),
            item("Duplicate title", "https://example.com/new#comments", 2),
        ]
        merged = sort_and_limit(values, 2)
        self.assertEqual([value.title for value in merged], ["Newest", "Duplicate title"])

    def test_builds_valid_rss(self):
        group = {
            "title": "Merged",
            "sources": ["https://example.com/feed.xml"],
            "self_url": "https://example.com/all.xml",
        }
        document = build_rss("all", group, [item("Hello", "https://example.com/hello", 1, "<p>Body</p>")])
        root = ET.fromstring(document)
        self.assertEqual(root.tag, "rss")
        self.assertEqual(root.findtext("channel/title"), "Merged")
        self.assertEqual(root.findtext("channel/item/title"), "Hello")
        self.assertEqual(root.findtext("channel/item/description"), "<p>Body</p>")
        self.assertEqual(root.find("channel/item/source").get("url"), "https://example.com/feed.xml")


if __name__ == "__main__":
    unittest.main()