/**
 * 手動清理工作樹。
 *
 * 這一支的重點全在**守門**：清理會被 pr-watch 自動執行，而自動執行的東西只能做
 * 可逆的事。工作樹裡還有沒提交的東西就中止，絕不 `--force`——刪掉的檔案救不回來。
 * 移除只動工作樹，本機分支留著，使用者還能回頭看那段歷史。
 *
 * 路徑由 `owner/repo/分支名` 推導，不查表也不讀狀態檔，所以這裡連帶驗它與
 * branch-prep 算出來的是同一條。
 *
 * git 不做替身：在臨時 git repo 上跑真的 git，以本機裸 repo 充當遠端，不需網路。
 */
import test from 'node:test';
import assert from 'node:assert/strict';
import { existsSync, mkdirSync, mkdtempSync, rmSync, writeFileSync } from 'node:fs';
import { join } from 'node:path';
import { runScript, tmpRoot } from './helpers/run-script.js';
import { makeTempRepoWithRemote } from './helpers/temp-repo.js';

const REPO = 'plugins/tea-sdlc';

/**
 * 備好一棵真的工作樹：路徑由 branch-prep 建，測試不自己算，
 * 兩支腳本推導出同一條路徑這件事本身就是要驗的東西。
 */
async function withWorktree(t, slug = 'mine') {
  const repo = makeTempRepoWithRemote();
  t.after(() => repo.cleanup());
  mkdirSync(tmpRoot, { recursive: true });
  const home = mkdtempSync(join(tmpRoot, 'home-'));
  t.after(() => rmSync(home, { recursive: true, force: true }));

  const { json } = await runScript(
    'branch-prep.js',
    ['--repo', REPO, '--path', repo.dir, '--source', 'master', '--type', 'feat', '--slug', slug],
    { env: { TEA_SDLC_HOME: home } },
  );
  assert.equal(json.ok, true, json.error?.message);
  return { repo, home, branch: json.data.branch, worktree: json.data.worktree };
}

const run = (home, args) => runScript('worktree-remove.js', args, { env: { TEA_SDLC_HOME: home } });

// ── 乾淨時移除 ─────────────────────────────────────────────────────

test('工作樹乾淨時移除它，本機分支留著', async (t) => {
  const { repo, home, branch, worktree } = await withWorktree(t);

  const { code, json } = await run(home, ['--repo', REPO, '--branch', branch]);

  assert.equal(code, 0, json.error?.message);
  assert.equal(json.data.removed, true);
  assert.equal(existsSync(worktree), false, '工作樹要真的不見了');
  assert.equal(
    repo.git('branch', '--list', branch).trim().replace(/^\*?\s*/, ''),
    branch,
    '本機分支要留著：不佔什麼空間，而使用者還會回頭看那段歷史',
  );
});

test('回報的路徑就是 branch-prep 建的那一條', async (t) => {
  const { home, branch, worktree } = await withWorktree(t);

  const { json } = await run(home, ['--repo', REPO, '--branch', branch]);

  assert.equal(json.data.worktree, worktree, '兩支腳本要從同一個輸入推導出同一條路徑');
});

// ── 守門：有未提交變更就中止 ───────────────────────────────────────

test('工作樹裡有未提交的變更時中止，並報出路徑', async (t) => {
  const { home, branch, worktree } = await withWorktree(t);
  writeFileSync(join(worktree, 'README.md'), '改到一半的東西\n');

  const { code, json } = await run(home, ['--repo', REPO, '--branch', branch]);

  assert.equal(code, 1);
  assert.equal(json.error.code, 'WORKTREE_DIRTY');
  assert.match(json.error.message, new RegExp(worktree), '要指名是哪一條路徑，人才找得到它');
  assert.match(json.error.message, /README\.md/, '也要說出是哪些檔案擋住了');
  assert.equal(existsSync(worktree), true, '擋下來就不該已經刪掉');
  assert.equal(existsSync(join(worktree, 'README.md')), true);
});

test('未追蹤的檔案同樣算未提交：它一樣會被刪掉', async (t) => {
  const { home, branch, worktree } = await withWorktree(t);
  writeFileSync(join(worktree, 'notes.txt'), '還沒加進版控的筆記\n');

  const { json } = await run(home, ['--repo', REPO, '--branch', branch]);

  assert.equal(json.error.code, 'WORKTREE_DIRTY');
  assert.match(json.error.message, /notes\.txt/);
});

// ── 冪等 ───────────────────────────────────────────────────────────

test('工作樹本來就不在時安靜地成功，重跑不會失敗', async (t) => {
  const { home, branch } = await withWorktree(t);
  await run(home, ['--repo', REPO, '--branch', branch]);

  const { code, json } = await run(home, ['--repo', REPO, '--branch', branch]);

  assert.equal(code, 0, json.error?.message);
  assert.equal(json.data.removed, false);
  assert.equal(json.data.已經不在, true, '要說清楚是本來就不在，不是這次刪的');
});

// ── --dry-run ─────────────────────────────────────────────────────

test('--dry-run 印出將執行的 git 指令，且不移除任何東西', async (t) => {
  const { home, branch, worktree } = await withWorktree(t);

  const { code, json } = await run(home, ['--repo', REPO, '--branch', branch, '--dry-run']);

  assert.equal(code, 0);
  assert.equal(json.data.dryRun, true);
  assert.deepEqual(json.data.commands, [`git worktree remove ${worktree}`]);
  assert.equal(
    json.data.commands.some((c) => c.includes('--force')),
    false,
    '絕不 --force：自動執行的東西只能做可逆的事',
  );
  assert.equal(existsSync(worktree), true, '試跑不該真的刪掉');
});

test('--dry-run 也照樣把守門的結果說出來', async (t) => {
  // 試跑印得出漂亮的計畫、實跑卻被擋下來，是最難查的那種落差
  const { home, branch, worktree } = await withWorktree(t);
  writeFileSync(join(worktree, 'wip.txt'), '做到一半\n');

  const { json } = await run(home, ['--repo', REPO, '--branch', branch, '--dry-run']);

  assert.equal(json.error.code, 'WORKTREE_DIRTY');
});

// ── flag ──────────────────────────────────────────────────────────

test('缺 --branch 時指名缺的是哪一個', async (t) => {
  const { home } = await withWorktree(t);

  const { json } = await run(home, ['--repo', REPO]);

  assert.equal(json.error.code, 'MISSING_FLAG');
  assert.match(json.error.message, /--branch/);
});

test('--repo 格式不是 owner/name 時失敗', async (t) => {
  const { home } = await withWorktree(t);

  const { json } = await run(home, ['--repo', 'tea-sdlc', '--branch', 'feat/mine/main']);

  assert.equal(json.error.code, 'BAD_REPO');
});

test('推導出來的路徑上是別人的東西時不碰它', async (t) => {
  const { repo, home, branch, worktree } = await withWorktree(t);
  repo.git('worktree', 'remove', worktree);
  mkdirSync(worktree, { recursive: true });
  writeFileSync(join(worktree, '別人的東西.txt'), 'x\n');

  const { code, json } = await run(home, ['--repo', REPO, '--branch', branch]);

  assert.equal(code, 1);
  assert.equal(json.error.code, 'NOT_A_WORKTREE');
  assert.equal(existsSync(join(worktree, '別人的東西.txt')), true);
});