// git-reflog-reset.test.mjs — Regression for #20 (LOW, v7.8.3).
//
// The force-push detector filtered reflog lines with
// `l.includes('reset:') || l.includes('reset')` — the second term subsumes the
// first, so any commit whose SUBJECT merely contains the word "reset" tripped
// the detector (the reflog %gs for a commit is `commit: <subject>`). Only the
// reflog ACTION `reset:` (from `git reset`) is force-push evidence.

import { describe, it } from 'node:test';
import assert from 'node:assert/strict';
import { spawnSync } from 'node:child_process';
import { mkdtempSync, writeFileSync, rmSync } from 'node:fs';
import { join } from 'node:path';
import { tmpdir } from 'node:os';
import { resetCounter } from '../../scanners/lib/output.mjs';
import { scan } from '../../scanners/git-forensics.mjs';

const gitAvailable = spawnSync('git', ['--version'], { encoding: 'utf-8' }).status === 0;

const RESET_TITLE = 'Force push signal: reflog contains reset entries';

/** Initialise a hermetic git repo (no global hooks/signing) at `dir`. */
function gitInit(dir) {
  const run = (...args) =>
    spawnSync('git', args, { cwd: dir, encoding: 'utf-8', env: { ...process.env, GIT_CONFIG_NOSYSTEM: '1' } });
  run('init', '-q');
  run('config', 'user.email', 'test@example.com');
  run('config', 'user.name', 'Test');
  run('config', 'commit.gpgsign', 'false');
  run('config', 'core.hooksPath', '/dev/null');
  return run;
}

describe('git-forensics: reflog reset detection (#20)', () => {
  it('a commit subject containing the word "reset" does not trip the detector', { skip: !gitAvailable }, async () => {
    const repo = mkdtempSync(join(tmpdir(), 'git-reflog-reset-'));
    try {
      const run = gitInit(repo);
      writeFileSync(join(repo, 'README.md'), '# fixture\n');
      run('add', '-A');
      run('commit', '-q', '-m', 'reset onboarding flow');

      resetCounter();
      const result = await scan(repo, {});
      assert.equal(result.status, 'ok', `expected ok, got '${result.status}'`);
      const resetFindings = result.findings.filter(f => f.title === RESET_TITLE);
      assert.equal(
        resetFindings.length, 0,
        `commit subject "reset onboarding flow" must not trip the force-push detector, ` +
        `got: ${resetFindings.map(f => f.evidence).join('; ')}`,
      );
    } finally {
      rmSync(repo, { recursive: true, force: true });
    }
  });

  it('a real `reset:` reflog action still trips the detector', { skip: !gitAvailable }, async () => {
    const repo = mkdtempSync(join(tmpdir(), 'git-reflog-reset-'));
    try {
      const run = gitInit(repo);
      writeFileSync(join(repo, 'README.md'), '# fixture\n');
      run('add', '-A');
      run('commit', '-q', '-m', 'initial');
      writeFileSync(join(repo, 'README.md'), '# fixture v2\n');
      run('add', '-A');
      run('commit', '-q', '-m', 'second');
      // Rewrites history: reflog gains a `reset: moving to HEAD~1` action entry.
      run('reset', '-q', '--hard', 'HEAD~1');

      resetCounter();
      const result = await scan(repo, {});
      assert.equal(result.status, 'ok', `expected ok, got '${result.status}'`);
      const resetFindings = result.findings.filter(f => f.title === RESET_TITLE);
      assert.ok(
        resetFindings.length >= 1,
        `expected the reset: reflog action to trip the detector, ` +
        `got findings: ${result.findings.map(f => f.title).join('; ')}`,
      );
    } finally {
      rmSync(repo, { recursive: true, force: true });
    }
  });
});