// 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);
  });
});

// v8.1.2: a target with no `.git` of its own under cwd shares cwd's git root,
// so the v8.1.1 rule alone calls it own. Two concrete places foreign code lands
// under a user's working directory without a `.git`: an installed package
// (a `node_modules` segment on the path from cwd to the target) and Claude
// Code's plugin directory (`$CLAUDE_CONFIG_DIR/plugins`, default
// `~/.claude/plugins` — cache/ and marketplaces/). Both are foreign now.
describe('isOwnWorkingTree(): node_modules and the plugin dir are foreign (v8.1.2)', () => {
  let root;
  let repo;
  let savedConfigDir;
  let savedHome;

  before(() => {
    root = mkOwnTreeDir('owt-812-');
    repo = join(root, 'repo');
    gitInit(repo);
    mkdirSync(join(repo, 'node_modules', 'evil-pkg', 'lib'), { recursive: true });
    mkdirSync(join(repo, 'node_modules', '@scope', 'pkg'), { recursive: true });
    mkdirSync(join(repo, 'packages', 'app', 'node_modules', 'dep'), { recursive: true });
    mkdirSync(join(repo, 'my-node_modules-notes'), { recursive: true });
    // A config dir with a plugin-cache copy (no `.git`, like 234/235 real ones)
    // and a plugin config dir sitting in a plain (no git root) parent.
    mkdirSync(join(root, 'cfg', 'plugins', 'cache', 'mkt', 'evil', '1.0.0'), { recursive: true });
    mkdirSync(join(root, 'cfg', 'plugins', 'marketplaces', 'mkt'), { recursive: true });
    mkdirSync(join(root, 'cfg', 'projects'), { recursive: true });
    mkdirSync(join(root, 'fakehome', '.claude', 'plugins', 'cache', 'mkt', 'p', '2.0.0'), { recursive: true });
    savedConfigDir = process.env.CLAUDE_CONFIG_DIR;
    savedHome = process.env.HOME;
  });

  after(() => {
    if (savedConfigDir === undefined) delete process.env.CLAUDE_CONFIG_DIR;
    else process.env.CLAUDE_CONFIG_DIR = savedConfigDir;
    process.env.HOME = savedHome;
    rmSync(root, { recursive: true, force: true });
  });

  it('(a) an installed package under the repo is foreign', () => {
    assert.equal(ownFrom(repo, join(repo, 'node_modules', 'evil-pkg')), false);
    assert.equal(ownFrom(repo, join(repo, 'node_modules', 'evil-pkg', 'lib')), false);
    assert.equal(ownFrom(repo, join(repo, 'node_modules', '@scope', 'pkg')), false);
    assert.equal(ownFrom(repo, join(repo, 'node_modules')), false);
  });

  it('(a) a nested node_modules (workspace package) is foreign', () => {
    assert.equal(ownFrom(repo, join(repo, 'packages', 'app', 'node_modules', 'dep')), false);
  });

  it('(c) the workspace package itself and a look-alike name stay own (known-positive)', () => {
    assert.equal(ownFrom(repo, join(repo, 'packages', 'app')), true);
    assert.equal(ownFrom(repo, join(repo, 'my-node_modules-notes')), true);
  });

  it('a package the user has cd\'d into is own (only the path from cwd counts)', () => {
    assert.equal(ownFrom(join(repo, 'node_modules', 'evil-pkg'), '.'), true);
    assert.equal(ownFrom(join(repo, 'node_modules', 'evil-pkg'), 'lib'), true);
  });

  it('(b) a copy under $CLAUDE_CONFIG_DIR/plugins/cache is foreign', () => {
    process.env.CLAUDE_CONFIG_DIR = join(root, 'cfg');
    const target = join(root, 'cfg', 'plugins', 'cache', 'mkt', 'evil', '1.0.0');
    assert.equal(ownFrom(root, target), false);
    assert.equal(ownFrom(join(root, 'cfg'), target), false);
    assert.equal(ownFrom(target, '.'), false);
  });

  it('(b) a clone under $CLAUDE_CONFIG_DIR/plugins/marketplaces is foreign', () => {
    process.env.CLAUDE_CONFIG_DIR = join(root, 'cfg');
    assert.equal(ownFrom(join(root, 'cfg'), join(root, 'cfg', 'plugins', 'marketplaces', 'mkt')), false);
  });

  it('(b) a relative CLAUDE_CONFIG_DIR is resolved against cwd', () => {
    process.env.CLAUDE_CONFIG_DIR = 'cfg';
    assert.equal(ownFrom(root, join(root, 'cfg', 'plugins', 'cache', 'mkt', 'evil', '1.0.0')), false);
  });

  it('(c) the rest of the config dir stays own (known-positive)', () => {
    process.env.CLAUDE_CONFIG_DIR = join(root, 'cfg');
    assert.equal(ownFrom(join(root, 'cfg'), join(root, 'cfg', 'projects')), true);
  });

  it('(b) without CLAUDE_CONFIG_DIR the default is ~/.claude/plugins', () => {
    delete process.env.CLAUDE_CONFIG_DIR;
    process.env.HOME = join(root, 'fakehome');
    try {
      const home = join(root, 'fakehome');
      assert.equal(ownFrom(home, join(home, '.claude', 'plugins', 'cache', 'mkt', 'p', '2.0.0')), false);
      assert.equal(ownFrom(home, join(home, '.claude')), true);
    } finally {
      process.env.HOME = savedHome;
    }
  });
});

// v8.1.3 (PM decisions):
//   (1) other install locations are foreign like `node_modules`: a
//     `site-packages` segment (Python venv) or a `vendor` segment
//     (composer/bundler/Go) on the path from cwd to the target, and anything
//     under a Claude Code config dir's `skills/` (third-party skills copied
//     into a git-tracked ~/.claude share its git root).
//   (2) BOTH `~/.claude` and `$CLAUDE_CONFIG_DIR` count as config dirs;
//     a leading `~` in the variable is expanded to the home dir.
//   (3) case is canonicalized (realpathSync.native), so `NODE_MODULES/x`
//     on a case-insensitive volume is the `node_modules` it names, and a
//     case-mismatched path to an own subdir is own (v8.1.2 known limit).
describe('isOwnWorkingTree(): v8.1.3 install locations, config dirs, case', () => {
  let root;
  let repo;
  let savedConfigDir;
  let savedHome;

  before(() => {
    root = mkOwnTreeDir('owt-813-');
    repo = join(root, 'repo');
    gitInit(repo);
    mkdirSync(join(repo, '.venv', 'lib', 'python3.12', 'site-packages', 'evilpkg'), { recursive: true });
    mkdirSync(join(repo, 'vendor', 'acme', 'lib'), { recursive: true });
    mkdirSync(join(repo, 'my-vendor-notes'), { recursive: true });
    mkdirSync(join(repo, 'node_modules', 'evil'), { recursive: true });
    mkdirSync(join(repo, 'Sub'), { recursive: true });
    // A git-tracked config dir (cwd = it) with third-party skills and its own
    // non-skill content, plus a $HOME-like dir with a default ~/.claude.
    gitInit(join(root, 'cfg'));
    mkdirSync(join(root, 'cfg', 'skills', 'third-party'), { recursive: true });
    mkdirSync(join(root, 'cfg', 'agents'), { recursive: true });
    mkdirSync(join(root, 'fakehome', '.claude', 'plugins', 'cache', 'mkt', 'p', '1.0.0'), { recursive: true });
    mkdirSync(join(root, 'fakehome', '.claude', 'skills', 'x'), { recursive: true });
    mkdirSync(join(root, 'fakehome', 'alt', 'plugins', 'cache', 'mkt', 'q'), { recursive: true });
    mkdirSync(join(root, 'fakehome', 'work'), { recursive: true });
    savedConfigDir = process.env.CLAUDE_CONFIG_DIR;
    savedHome = process.env.HOME;
  });

  after(() => {
    if (savedConfigDir === undefined) delete process.env.CLAUDE_CONFIG_DIR;
    else process.env.CLAUDE_CONFIG_DIR = savedConfigDir;
    process.env.HOME = savedHome;
    rmSync(root, { recursive: true, force: true });
  });

  it('(1) a package in a Python venv site-packages is foreign', () => {
    assert.equal(ownFrom(repo, join(repo, '.venv', 'lib', 'python3.12', 'site-packages', 'evilpkg')), false);
  });

  it('(1) a composer/bundler vendor/ package is foreign', () => {
    assert.equal(ownFrom(repo, join(repo, 'vendor', 'acme')), false);
    assert.equal(ownFrom(repo, join(repo, 'vendor', 'acme', 'lib')), false);
  });

  it('(1) the venv root and a look-alike name stay own (known-positive)', () => {
    assert.equal(ownFrom(repo, join(repo, '.venv')), true);
    assert.equal(ownFrom(repo, join(repo, 'my-vendor-notes')), true);
  });

  it('(1) skills in a git-tracked config dir are foreign, the rest stays own', () => {
    process.env.CLAUDE_CONFIG_DIR = join(root, 'cfg');
    try {
      assert.equal(ownFrom(join(root, 'cfg'), join(root, 'cfg', 'skills', 'third-party')), false);
      assert.equal(ownFrom(join(root, 'cfg'), join(root, 'cfg', 'agents')), true);
    } finally {
      if (savedConfigDir === undefined) delete process.env.CLAUDE_CONFIG_DIR;
      else process.env.CLAUDE_CONFIG_DIR = savedConfigDir;
    }
  });

  it('(1) skills under the default ~/.claude are foreign', () => {
    delete process.env.CLAUDE_CONFIG_DIR;
    process.env.HOME = join(root, 'fakehome');
    try {
      const home = join(root, 'fakehome');
      assert.equal(ownFrom(home, join(home, '.claude', 'skills', 'x')), false);
    } finally {
      process.env.HOME = savedHome;
    }
  });

  it('(2) ~/.claude/plugins stays foreign when CLAUDE_CONFIG_DIR points at another profile', () => {
    process.env.HOME = join(root, 'fakehome');
    process.env.CLAUDE_CONFIG_DIR = join(root, 'fakehome', 'alt');
    try {
      const home = join(root, 'fakehome');
      assert.equal(ownFrom(home, join(home, '.claude', 'plugins', 'cache', 'mkt', 'p', '1.0.0')), false);
      assert.equal(ownFrom(home, join(home, 'alt', 'plugins', 'cache', 'mkt', 'q')), false);
      assert.equal(ownFrom(home, join(home, 'work')), true);
    } finally {
      process.env.HOME = savedHome;
      if (savedConfigDir === undefined) delete process.env.CLAUDE_CONFIG_DIR;
      else process.env.CLAUDE_CONFIG_DIR = savedConfigDir;
    }
  });

  it('(2) a leading ~ in CLAUDE_CONFIG_DIR is expanded to the home dir', () => {
    process.env.HOME = join(root, 'fakehome');
    process.env.CLAUDE_CONFIG_DIR = '~/alt';
    try {
      const home = join(root, 'fakehome');
      assert.equal(ownFrom(home, join(home, 'alt', 'plugins', 'cache', 'mkt', 'q')), false);
    } finally {
      process.env.HOME = savedHome;
      if (savedConfigDir === undefined) delete process.env.CLAUDE_CONFIG_DIR;
      else process.env.CLAUDE_CONFIG_DIR = savedConfigDir;
    }
  });

  it('(3) a case variant of node_modules is foreign (case-insensitive volume)', (t) => {
    if (!existsSync(join(repo, 'NODE_MODULES'))) {
      t.skip('volume is case-sensitive: NODE_MODULES is a different directory');
      return;
    }
    assert.equal(ownFrom(repo, join(repo, 'NODE_MODULES', 'evil')), false);
  });

  it('(3) a case-mismatched path to an own subdir is own (v8.1.2 known limit)', (t) => {
    if (!existsSync(join(root, 'REPO'))) {
      t.skip('volume is case-sensitive: REPO is not repo');
      return;
    }
    // The mismatch sits in a parent segment: realpathSync keeps `REPO`, so the
    // target did not start with cwd and was called foreign.
    assert.equal(ownFrom(repo, join(root, 'REPO', 'Sub')), true);
  });
});