// tests/lib/park-attempt-files.test.mjs
// A step sent back to the plan leaves its new files on disk; before the fresh
// build of the re-planned step they are moved into the report dir, never
// deleted (voyage-lekerepo trial 5, finding 4).

import { test } from 'node:test';
import { strict as assert } from 'node:assert';
import { mkdtempSync, writeFileSync, readFileSync, existsSync, mkdirSync, rmSync } from 'node:fs';
import { join, dirname } from 'node:path';
import { tmpdir } from 'node:os';
import { fileURLToPath } from 'node:url';
import { spawnSync } from 'node:child_process';

const ROOT = join(dirname(fileURLToPath(import.meta.url)), '..', '..');
const CLI = join(ROOT, 'lib/util/park-attempt-files.mjs');

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

function repo() {
  const dir = mkdtempSync(join(tmpdir(), 'voyage-park-'));
  git(dir, 'init', '-q');
  git(dir, 'config', 'user.email', 't@example.invalid');
  git(dir, 'config', 'user.name', 't');
  mkdirSync(join(dir, 'bin'));
  writeFileSync(join(dir, 'bin/slug.mjs'), 'old\n');
  git(dir, 'add', 'bin/slug.mjs');
  git(dir, 'commit', '-q', '-m', 'base');
  return dir;
}

// The shape `git diff {start_sha}` gives with the new files registered --intent-to-add.
const DIFF = [
  'diff --git a/bin/slug.mjs b/bin/slug.mjs',
  'index 3367afd..e69de29 100644',
  '--- a/bin/slug.mjs',
  '+++ b/bin/slug.mjs',
  '@@ -1 +1 @@',
  '-old',
  '+new',
  'diff --git a/tests/batch.sh b/tests/batch.sh',
  'new file mode 100755',
  'index 0000000..1111111',
  '--- /dev/null',
  '+++ b/tests/batch.sh',
  '@@ -0,0 +1 @@',
  '+cat',
  'diff --git a/tests/cli-stdin.test.mjs b/tests/cli-stdin.test.mjs',
  'new file mode 100644',
  '--- /dev/null',
  '+++ b/tests/cli-stdin.test.mjs',
  '@@ -0,0 +1 @@',
  '+t',
  '',
].join('\n');

function run(dir, extra = []) {
  writeFileSync(join(dir, 'upward.diff'), DIFF);
  return spawnSync(process.execPath, [CLI, '--diff', join(dir, 'upward.diff'), '--to', join(dir, 'parked'), '--cwd', dir, ...extra], { encoding: 'utf8' });
}

test('park: the step\'s untracked new files move into --to with their paths; tracked files stay', () => {
  const dir = repo();
  try {
    mkdirSync(join(dir, 'tests'));
    writeFileSync(join(dir, 'tests/batch.sh'), 'stale | cat\n');
    writeFileSync(join(dir, 'tests/cli-stdin.test.mjs'), 'stale test\n');
    writeFileSync(join(dir, 'bin/slug.mjs'), 'new\n');
    const r = run(dir);
    assert.equal(r.status, 0, r.stderr);
    const out = JSON.parse(r.stdout);
    assert.deepEqual(out.parked, ['tests/batch.sh', 'tests/cli-stdin.test.mjs']);
    assert.equal(existsSync(join(dir, 'tests/batch.sh')), false, 'the stale file is out of the tree');
    assert.equal(readFileSync(join(dir, 'parked/tests/batch.sh'), 'utf8'), 'stale | cat\n', 'and kept, never deleted');
    assert.equal(readFileSync(join(dir, 'bin/slug.mjs'), 'utf8'), 'new\n', 'a tracked file is not the helper\'s to move');
  } finally {
    rmSync(dir, { recursive: true, force: true });
  }
});

test('park: a new file that is tracked now, or already gone, is kept and named, never moved', () => {
  const dir = repo();
  try {
    mkdirSync(join(dir, 'tests'));
    writeFileSync(join(dir, 'tests/batch.sh'), 'committed by the operator\n');
    git(dir, 'add', 'tests/batch.sh');
    git(dir, 'commit', '-q', '-m', 'operator');
    const r = run(dir);
    assert.equal(r.status, 0, r.stderr);
    const out = JSON.parse(r.stdout);
    assert.deepEqual(out.parked, []);
    assert.deepEqual(out.kept.map((k) => k.path), ['tests/batch.sh', 'tests/cli-stdin.test.mjs']);
    assert.match(out.kept[0].reason, /tracked/);
    assert.match(out.kept[1].reason, /not on disk/);
    assert.equal(existsSync(join(dir, 'tests/batch.sh')), true);
  } finally {
    rmSync(dir, { recursive: true, force: true });
  }
});

test('park: a path that leaves the repository is refused, never moved', () => {
  const dir = repo();
  try {
    const evil = DIFF.replaceAll('tests/batch.sh', '../outside.sh');
    writeFileSync(join(dir, 'upward.diff'), evil);
    const r = spawnSync(process.execPath, [CLI, '--diff', join(dir, 'upward.diff'), '--to', join(dir, 'parked'), '--cwd', dir], { encoding: 'utf8' });
    assert.equal(r.status, 0, r.stderr);
    const out = JSON.parse(r.stdout);
    assert.ok(out.kept.some((k) => k.path === '../outside.sh' && /outside the repository/.test(k.reason)), r.stdout);
  } finally {
    rmSync(dir, { recursive: true, force: true });
  }
});

test('park: an unreadable diff or missing arguments exit 2 and move nothing', () => {
  const dir = repo();
  try {
    const r = spawnSync(process.execPath, [CLI, '--diff', join(dir, 'nope.diff'), '--to', join(dir, 'parked'), '--cwd', dir], { encoding: 'utf8' });
    assert.equal(r.status, 2);
    assert.equal(spawnSync(process.execPath, [CLI], { encoding: 'utf8' }).status, 2);
  } finally {
    rmSync(dir, { recursive: true, force: true });
  }
});

test('trekexecute: a re-planned step parks the earlier attempt\'s new files before the fresh build', () => {
  const md = readFileSync(join(ROOT, 'commands/trekexecute.md'), 'utf8');
  const at = md.indexOf('A step at `fix_rounds` 4 on `--resume` was re-planned');
  assert.ok(at > 0);
  const para = md.slice(at, at + 1200);
  assert.match(para, /lib\/util\/park-attempt-files\.mjs/);
  assert.match(para, /step-\{N\}-upward\.diff/);
  assert.match(para, /never deleted/);
});