# Copyright (c) 2026 Krzysztof Rudnicki. MIT licence.
"""DOCS-changelog.md is the only copy, so the parser has to earn that."""

from __future__ import annotations

from pathlib import Path

from signal_bot.changelog import Release, load, parse, since
from signal_bot.versioning import __version__

DOCUMENT = """\
# Changelog

Prose between releases is ignored.

- a bullet before any heading belongs to no release

## 0.0.1 — Linus

- druga zmiana
- trzecia zmiana

Some more prose.

## 0.0.0 — Święty Piotr Apostoł

- pierwsza zmiana
"""


def test_parse_reads_headings_and_their_bullets() -> None:
    releases = parse(DOCUMENT)
    assert [r.version for r in releases] == ["0.0.0", "0.0.1"]
    assert releases[0].pope == "Święty Piotr Apostoł"
    assert releases[1].lines == ("druga zmiana", "trzecia zmiana")


def test_a_bullet_above_every_heading_belongs_to_nobody() -> None:
    """Otherwise the file's own format documentation becomes a changelog entry."""
    assert all("belongs to no release" not in line for r in parse(DOCUMENT) for line in r.lines)


def test_parse_of_nothing_is_nothing() -> None:
    assert parse("# Changelog\n\njust prose\n") == ()


def test_releases_come_back_oldest_first_whatever_the_file_order() -> None:
    assert [r.ordinal for r in parse(DOCUMENT)] == [1, 2]


def test_since_returns_only_what_the_group_has_not_seen() -> None:
    releases = parse(DOCUMENT)
    assert [r.version for r in since(releases, "0.0.0")] == ["0.0.1"]
    assert since(releases, "0.0.1") == ()


def test_since_an_unknown_version_announces_nothing() -> None:
    """A hand-edited or downgraded record must not dump the whole backlog."""
    assert since(parse(DOCUMENT), "9.9.9") == ()


def test_a_missing_changelog_costs_an_announcement_not_the_process() -> None:
    assert load(Path("/nonexistent/DOCS-changelog.md")) == ()


def test_the_real_changelog_covers_the_running_version() -> None:
    """A release with no entry would announce a version and then say nothing."""
    versions = [release.version for release in load()]
    assert __version__ in versions


def test_release_knows_its_ordinal() -> None:
    assert Release("2.13.7", "Jan Paweł II", ()).ordinal == 264