"""Release notes come from CHANGELOG.md (Keep a Changelog headings)."""

from __future__ import annotations

from napalm_standard.changelog import changelog_section

TEXT = """\
# Changelog

## [Unreleased]

- not yet

## [1.2.0] - 2026-10-22

### Added
- Interfaces.

---

## [1.1.0] - 2026-10-01

- Facts.
"""


def test_the_section_runs_to_the_next_version_heading() -> None:
    assert changelog_section(TEXT, "1.2.0") == "### Added\n- Interfaces."


def test_a_leading_v_is_ignored() -> None:
    assert changelog_section(TEXT, "v1.1.0") == "- Facts."


def test_an_unknown_version_has_no_section() -> None:
    assert changelog_section(TEXT, "9.9.9") is None


def test_an_empty_section_has_none() -> None:
    assert changelog_section("## [1.0.0] - x\n\n## [0.9.0] - y\n- a\n", "1.0.0") is None


def test_a_heading_without_brackets_is_not_a_version_heading() -> None:
    assert changelog_section("## 1.0.0\n\n- a\n", "1.0.0") is None


def test_the_last_section_runs_to_the_end() -> None:
    assert changelog_section("## [1.0.0] - x\n- a\n- b", "1.0.0") == "- a\n- b"