"""The citation popover shows prose, not Markdown source.

The popover is a small hover surface showing a fragment, so the excerpt is
reduced to prose rather than rendered: a cited table would otherwise become
a real table squeezed into ~320px, and a cited heading would render at h2
size. Clicking the badge opens the document in the side panel, which does
render Markdown properly.

These cases are all real shapes from the fixture corpus.
"""

from app.modes.query import EXCERPT_CHARS
from app.modes.query import excerpt as make_excerpt


def test_a_cited_table_reads_as_prose() -> None:
    """The worst case, and the one that sent this back for a second pass:
    the divider row is pure punctuation and survives naive stripping."""
    excerpt = make_excerpt(
        "| Code | Bedeutung | Sofortmaßnahme |\n"
        "|-------|------------|----------------|\n"
        "| E-101 | Not-Aus-Kreis unterbrochen | Alle Not-Aus-Taster prüfen |"
    )
    assert "|" not in excerpt
    assert "---" not in excerpt
    assert excerpt.startswith("Code · Bedeutung · Sofortmaßnahme · E-101")


def test_inline_emphasis_loses_its_markers_not_its_words() -> None:
    for source, expected in [
        ("**Eingang erfassen**: im ERP anlegen.", "Eingang erfassen: im ERP anlegen."),
        ("die Presse muss *drucklos* sein", "die Presse muss drucklos sein"),
        ("__Achtung__ beim Anfahren", "Achtung beim Anfahren"),
        ("setze `max_turns` hoch", "setze max_turns hoch"),
        ("**fett _und_ kursiv**", "fett und kursiv"),
    ]:
        assert make_excerpt(source) == expected


def test_links_keep_their_text_and_drop_their_target() -> None:
    excerpt = make_excerpt(
        "Siehe [das Handbuch](https://intranet.example/doc.pdf) dazu."
    )
    assert excerpt == "Siehe das Handbuch dazu."
    # A URL in a hover preview is noise, and it is also the part a reader
    # cannot click here anyway.
    assert "http" not in excerpt


def test_block_markers_and_fences_are_dropped() -> None:
    excerpt = make_excerpt(
        "## Wartung\n\n"
        "- **Getriebeöl GX-220**: monatlich\n"
        "1. Bettbahnöl wöchentlich\n"
        "> Wichtig: erst entlüften\n"
        "```yaml\n"
        "interval: 30\n"
        "```"
    )
    assert excerpt.startswith("Wartung Getriebeöl GX-220: monatlich")
    for marker in ("##", "```", "> ", "**"):
        assert marker not in excerpt


def test_plain_prose_is_left_alone() -> None:
    source = "Die Kaffeemaschine wird freitags entkalkt."
    assert make_excerpt(source) == source


def test_underscores_inside_identifiers_survive() -> None:
    """`result_document_id` is not italics. Emphasis needs a non-space
    character on both sides, which is what keeps snake_case intact."""
    assert make_excerpt("das Feld result_document_id bleibt leer") == (
        "das Feld result_document_id bleibt leer"
    )


def test_long_content_is_cut_on_a_word_boundary() -> None:
    excerpt = make_excerpt("Wartung " * 200)
    assert len(excerpt) <= EXCERPT_CHARS + 1  # the ellipsis
    assert excerpt.endswith("…")
    assert not excerpt.rstrip("…").endswith(" ")