// tests/hooks/pre-compact-flush.test.mjs
// The PreCompact hook rebuilds progress.json from git and refreshes the
// session state before compaction. An independent review (2026-10-08) found
// that the checkpoint form `git add … && git commit -m "…"` (plan template,
// lekerepo trial 2 point A7) matched nothing, and that an empty match skipped
// the session-state refresh too. No test covered the hook until now.

import { test } from 'node:test';
import { strict as assert } from 'node:assert';
import { spawnSync } from 'node:child_process';
import { mkdirSync, mkdtempSync, readFileSync, rmSync, writeFileSync } from 'node:fs';
import { tmpdir } from 'node:os';
import { dirname, join } from 'node:path';
import { fileURLToPath } from 'node:url';
import { childEnv } from '../helpers/child-env.mjs';

const HERE = dirname(fileURLToPath(import.meta.url));
const HOOK = join(HERE, '..', '..', 'hooks', 'scripts', 'pre-compact-flush.mjs');

function git(cwd, ...args) {
  const r = spawnSync('git', args, { cwd, encoding: 'utf8' });
  assert.equal(r.status, 0, `git ${args.join(' ')}: ${r.stderr}`);
  return r.stdout.trim();
}

function project(checkpoint, { stateStatus = 'in_progress' } = {}) {
  const repo = mkdtempSync(join(tmpdir(), 'voyage-precompact-'));
  git(repo, 'init', '-q');
  git(repo, 'config', 'user.email', 't@example.invalid');
  git(repo, 'config', 'user.name', 'test');
  writeFileSync(join(repo, 'a.txt'), 'a\n');
  git(repo, 'add', 'a.txt');
  git(repo, 'commit', '-q', '-m', 'base');
  const base = git(repo, 'rev-parse', 'HEAD');
  writeFileSync(join(repo, 'a.txt'), 'b\n');
  git(repo, 'add', 'a.txt');
  git(repo, 'commit', '-q', '-m', 'feat(a): change a');
  const dir = join(repo, '.claude', 'projects', 'p');
  mkdirSync(dir, { recursive: true });
  writeFileSync(join(dir, 'plan.md'), ['# Plan', '', '### Step 1: Change a', '', `- **Checkpoint:** ${checkpoint}`, ''].join('\n'));
  writeFileSync(join(dir, 'progress.json'), JSON.stringify({ status: 'in_progress', current_step: 0, steps: {}, session_start_sha: base }));
  writeFileSync(join(dir, '.session-state.local.json'), JSON.stringify({ status: stateStatus, updated_at: '2000-01-01T00:00:00.000Z' }));
  return { repo, dir };
}

function run(repo) {
  return spawnSync(process.execPath, [HOOK], { input: '{}', encoding: 'utf8', env: childEnv({ CLAUDE_PROJECT_DIR: repo }) });
}

const progress = (dir) => JSON.parse(readFileSync(join(dir, 'progress.json'), 'utf8'));
const state = (dir) => JSON.parse(readFileSync(join(dir, '.session-state.local.json'), 'utf8'));

for (const [name, cp] of [
  ['the old form', '`git commit -m "feat(a): change a"`'],
  ['the template form with git add', '`git add a.txt && git commit -m "feat(a): change a"`'],
]) {
  test(`pre-compact: ${name} -> progress.json is rebuilt from git`, () => {
    const { repo, dir } = project(cp);
    try {
      assert.equal(run(repo).status, 0);
      assert.equal(progress(dir).current_step, 1);
    } finally { rmSync(repo, { recursive: true, force: true }); }
  });
}

test('pre-compact: a plan with no recognisable checkpoint still refreshes the session state', () => {
  const { repo, dir } = project('`make commit`');
  try {
    assert.equal(run(repo).status, 0);
    assert.equal(progress(dir).current_step, 0);
    assert.notEqual(state(dir).updated_at, '2000-01-01T00:00:00.000Z');
  } finally { rmSync(repo, { recursive: true, force: true }); }
});