// own-working-tree.test.mjs — isOwnWorkingTree() rule (v8.1.1).
//
// v8.1.0 treated any target at or below the process cwd as the caller's own
// working tree. That is too wide: a foreign clone that sits UNDER cwd (cwd =
// $HOME, or a project with a cloned vendor dir) still had its .llm-security
// config read. v8.1.1 narrows the rule: the target must be at or below cwd
// AND have the same git root as cwd — the nearest ancestor holding a `.git`
// (directory for a clone, file for a submodule/worktree), or none for both.
// A nested clone therefore counts as foreign. The failure direction is safe:
// foreign means the target's config is ignored, so more findings, never fewer.
//
// Fixtures live under $HOME (outside os.tmpdir(), which is always foreign,
// and outside this repo's git tree); $HOME itself must not be a git root.

import { describe, it, before, after } from 'node:test';
import assert from 'node:assert/strict';
import { join } from 'node:path';
import { mkdirSync, writeFileSync, rmSync, existsSync } from 'node:fs';
import { homedir } from 'node:os';
import { spawnSync } from 'node:child_process';
import { isOwnWorkingTree } from '../../scanners/lib/own-working-tree.mjs';
import { mkOwnTreeDir } from '../helpers/own-tree.mjs';

function gitInit(dir) {
  mkdirSync(dir, { recursive: true });
  const r = spawnSync('git', ['init', '-q', dir], { encoding: 'utf8' });
  assert.equal(r.status, 0, `git init failed: ${r.stderr}`);
}

function ownFrom(cwd, target) {
  const prev = process.cwd();
  process.chdir(cwd);
  try {
    return isOwnWorkingTree(target);
  } finally {
    process.chdir(prev);
  }
}

describe('isOwnWorkingTree(): same git root as cwd (v8.1.1)', () => {
  let root;
  let repo;
  let homeish;

  before(() => {
    assert.ok(!existsSync(join(homedir(), '.git')), 'precondition: $HOME is not a git root');
    root = mkOwnTreeDir('owt-unit-');
    // A repo the user works in, with a plain subdir, a nested clone and a
    // submodule-style checkout (`.git` is a file).
    repo = join(root, 'repo');
    gitInit(repo);
    mkdirSync(join(repo, 'sub', 'deeper'), { recursive: true });
    gitInit(join(repo, 'vendor', 'clone'));
    mkdirSync(join(repo, 'vendor', 'clone', 'inner'), { recursive: true });
    mkdirSync(join(repo, 'submod'), { recursive: true });
    writeFileSync(join(repo, 'submod', '.git'), 'gitdir: ../.git/modules/submod\n');
    // A $HOME-like dir: no git root, holding one clone and one plain dir.
    homeish = join(root, 'homeish');
    mkdirSync(join(homeish, 'plain'), { recursive: true });
    gitInit(join(homeish, 'clone'));
  });

  after(() => { rmSync(root, { recursive: true, force: true }); });

  it('cwd itself is own', () => {
    assert.equal(ownFrom(repo, repo), true);
    assert.equal(ownFrom(repo, '.'), true);
  });

  it('(b) a subdir of the same repo is own (known-positive)', () => {
    assert.equal(ownFrom(repo, join(repo, 'sub')), true);
    assert.equal(ownFrom(join(repo, 'sub'), join(repo, 'sub', 'deeper')), true);
  });

  it('(a) a nested clone under the repo is foreign', () => {
    assert.equal(ownFrom(repo, join(repo, 'vendor', 'clone')), false);
  });

  it('(a) a subdir inside a nested clone is foreign', () => {
    assert.equal(ownFrom(repo, join(repo, 'vendor', 'clone', 'inner')), false);
  });

  it('a submodule/worktree checkout (`.git` file) is foreign', () => {
    assert.equal(ownFrom(repo, join(repo, 'submod')), false);
  });

  it('(c) a clone under a cwd with no git root is foreign', () => {
    assert.equal(ownFrom(homeish, join(homeish, 'clone')), false);
  });

  it('a plain subdir of a cwd with no git root is own', () => {
    assert.equal(ownFrom(homeish, join(homeish, 'plain')), true);
  });

  it('a clone the user has cd\'d into is own (it is cwd)', () => {
    assert.equal(ownFrom(join(homeish, 'clone'), '.'), true);
  });

  it('a target outside cwd is foreign', () => {
    assert.equal(ownFrom(join(repo, 'sub'), repo), false);
  });
});