"""Tests for scripts/check_adrs.py — ADR immutability gate."""

from __future__ import annotations

import subprocess
import sys
from pathlib import Path

import pytest

SCRIPTS = Path(__file__).resolve().parents[2] / "scripts"
sys.path.insert(0, str(SCRIPTS))

from check_adrs import find_modified_adrs, run_check  # noqa: E402


def _git(cwd: Path, *args: str) -> None:
    subprocess.check_call(["git", *args], cwd=cwd, stdout=subprocess.DEVNULL)


def test_no_modified_adrs_on_current_branch() -> None:
    assert run_check(base="origin/main") == 0


def test_detects_adr_edit_in_sandbox(tmp_path: Path) -> None:
    _git(tmp_path, "init")
    _git(tmp_path, "config", "user.email", "ci@test")
    _git(tmp_path, "config", "user.name", "ci")
    adr = tmp_path / "docs/adr"
    adr.mkdir(parents=True)
    (adr / "ADR-0001-test.md").write_text("v1\n")
    _git(tmp_path, "add", ".")
    _git(tmp_path, "commit", "-m", "add adr")
    _git(tmp_path, "branch", "-M", "main")
    (adr / "ADR-0001-test.md").write_text("v2\n")
    _git(tmp_path, "checkout", "-b", "feature")
    _git(tmp_path, "add", ".")
    _git(tmp_path, "commit", "-m", "edit adr")

    monkeypatch = pytest.MonkeyPatch()
    monkeypatch.setattr("check_adrs.ROOT", tmp_path)
    try:
        assert find_modified_adrs("main") == ["docs/adr/ADR-0001-test.md"]
        assert run_check(base="main") == 1
    finally:
        monkeypatch.undo()


def test_new_adr_allowed(tmp_path: Path) -> None:
    _git(tmp_path, "init")
    _git(tmp_path, "config", "user.email", "ci@test")
    _git(tmp_path, "config", "user.name", "ci")
    adr = tmp_path / "docs/adr"
    adr.mkdir(parents=True)
    (adr / "ADR-0001-test.md").write_text("v1\n")
    _git(tmp_path, "add", ".")
    _git(tmp_path, "commit", "-m", "add adr")
    _git(tmp_path, "branch", "-M", "main")
    (adr / "ADR-0002-new.md").write_text("new\n")
    _git(tmp_path, "checkout", "-b", "feature")
    _git(tmp_path, "add", ".")
    _git(tmp_path, "commit", "-m", "add adr 2")

    monkeypatch = pytest.MonkeyPatch()
    monkeypatch.setattr("check_adrs.ROOT", tmp_path)
    try:
        assert find_modified_adrs("main") == []
        assert run_check(base="main") == 0
    finally:
        monkeypatch.undo()