/**
 * 開立 PR 並停錶。
 *
 * 三件事要驗：
 *   1. **標題等同分支名**——reviewer 在列表上看到的就是分支，兩者對不上會找錯 PR。
 *   2. **描述的七段都在**，而且「測試結果」不是空話。這一段是 reviewer 唯一能判斷
 *      「這東西真的跑過嗎」的依據，寫「已測試通過」等於沒寫。
 *   3. **PR 開完才停錶**，而且開失敗時錶不能停——工時要記在真的有做事的那段時間上。
 */
import test from 'node:test';
import assert from 'node:assert/strict';
import { mkdirSync, writeFileSync } from 'node:fs';
import { join } from 'node:path';
import { runScript, tmpRoot } from './helpers/run-script.js';
import { healthyRoutes, stubEnv as envFor, withStubGitea } from './helpers/stub-gitea.js';

/** PR 開在目標專案上 */
const REPO = 'myorg/myapp';
/** 工作包議題在另一個 repo 上——這是常態，不是特例 */
const ISSUE_REPO = 'plugins/tea-sdlc';
const HEAD = 'feat/commit-split-and-pr/main';
const INDEX = 13;

/** 一份七段俱全的描述 */
const BODY = `## 摘要

工作包做完之後，變更被整理成可讀的歷史，PR 開出來，碼錶停下。

## 需求議題

#1

## 工作包議題

#13

## 變更內容

新增 commit-split 與 pr-create 兩支腳本。

## 設計重點

分批的界線是類型，一個 commit 只裝一種。

## 解決的問題

巨大的單一 commit 等於沒有歷史。

## 影響的功能

sdlc-feat 的第三段。

## 測試結果

\`\`\`
ℹ tests 527
ℹ pass 527
ℹ fail 0
\`\`\`
`;

/** 把描述寫成檔案，回傳路徑 */
function bodyFile(name, content) {
  mkdirSync(tmpRoot, { recursive: true });
  const path = join(tmpRoot, `pr-body-${name}-${process.hrtime.bigint()}.md`);
  writeFileSync(path, content);
  return path;
}

function routes(overrides = {}) {
  return healthyRoutes(REPO, {
    [`GET /api/v1/repos/${REPO}/pulls`]: { status: 200, body: [] },
    [`POST /api/v1/repos/${REPO}/pulls`]: (req) => ({
      status: 201,
      body: { number: 99, title: req.body.title, html_url: `https://gitea.jsc.idv.tw/${REPO}/pulls/99` },
    }),
    [`POST /api/v1/repos/${ISSUE_REPO}/issues/${INDEX}/stopwatch/stop`]: { status: 201, body: {} },
    ...overrides,
  });
}

const withStub = (t, overrides = {}) => withStubGitea(t, routes(overrides));

const BASE_ARGS = ['--repo', REPO, '--head', HEAD, '--base', 'master'];

const run = (args, stub) =>
  runScript('pr-create.js', [...BASE_ARGS, ...args], { env: envFor(stub) });

/** 完整的一次呼叫：議題在另一個 repo 上 */
const runFull = (file, stub, extra = []) =>
  run(['--body-file', file, '--issue-repo', ISSUE_REPO, '--index', String(INDEX), ...extra], stub);

const posts = (stub) =>
  stub.requests.filter((r) => r.method === 'POST').map((r) => r.path);

// ── 標題與描述 ─────────────────────────────────────────────────────

test('PR 標題等同分支名', async (t) => {
  const stub = await withStub(t);
  const file = bodyFile('full', BODY);

  const { code, json } = await runFull(file, stub);

  assert.equal(code, 0, JSON.stringify(json));
  const pull = stub.requests.find((r) => r.method === 'POST' && r.path.endsWith('/pulls'));
  assert.equal(pull.body.title, HEAD);
  assert.equal(json.data.title, HEAD);
});

test('描述原樣送出，一個字都不改寫', async (t) => {
  const stub = await withStub(t);
  const file = bodyFile('verbatim', BODY);

  await runFull(file, stub);

  const pull = stub.requests.find((r) => r.method === 'POST' && r.path.endsWith('/pulls'));
  assert.equal(pull.body.body, BODY);
});

test('--base 照給的值送出，不預設猜一個', async (t) => {
  // 目標專案的開發分支可能叫 master、main 或 develop，猜錯會開到不存在的 base
  const stub = await withStub(t);
  const file = bodyFile('base', BODY);

  await runFull(file, stub);

  assert.equal(stub.requests.find((r) => r.method === 'POST').body.base, 'master');
});

test('沒給 --base 時擋下，並說明為什麼不替你猜', async (t) => {
  const stub = await withStub(t);
  const file = bodyFile('nobase', BODY);

  const { json } = await runScript('pr-create.js', [
    '--repo', REPO, '--head', HEAD, '--body-file', file,
    '--issue-repo', ISSUE_REPO, '--index', String(INDEX),
  ], { env: envFor(stub) });

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

// ── 七段：少一段就擋 ───────────────────────────────────────────────

const SECTIONS = [
  '摘要', '需求議題', '工作包議題', '變更內容',
  '設計重點', '解決的問題', '影響的功能', '測試結果',
];

for (const missing of SECTIONS) {
  test(`描述缺少「${missing}」時擋下，並指名缺的是哪一段`, async (t) => {
    const stub = await withStub(t);
    const body = BODY.split(/^## /m)
      .filter((part) => !part.startsWith(missing))
      .join('## ');
    const file = bodyFile(`missing-${missing}`, body);

    const { code, json } = await runFull(file, stub);

    assert.equal(code, 1);
    assert.equal(json.error.code, 'MISSING_SECTION');
    assert.match(json.error.message, new RegExp(missing));
    assert.deepEqual(posts(stub), [], '描述不合格就不該開 PR');
  });
}

test('段落順序不對時也擋下：reviewer 每次要在同一個位置找到同一件事', async (t) => {
  const stub = await withStub(t);
  const swapped = BODY.replace(
    /## 設計重點([\s\S]*?)## 解決的問題([\s\S]*?)## 影響的功能/,
    '## 解決的問題$2## 設計重點$1## 影響的功能',
  );
  const file = bodyFile('order', swapped);

  const { json } = await runFull(file, stub);

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

test('測試結果整段都是空話時擋下，不只看單行', async (t) => {
  const stub = await withStub(t);
  const body = BODY.replace(/## 測試結果[\s\S]*$/, '## 測試結果\n\n已測試通過\n無異常\n');
  const file = bodyFile('multi-talk', body);

  const { json } = await runFull(file, stub);

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

test('描述裡引用到「## 測試結果」這幾個字時，檢查的仍是真正那一段', async (t) => {
  const stub = await withStub(t);
  const body = BODY.replace(
    '新增 commit-split 與 pr-create 兩支腳本。',
    '新增兩支腳本，並要求 `## 測試結果` 這一段放實際輸出。',
  );
  const file = bodyFile('quoted-heading', body);

  const { code, json } = await runFull(file, stub);

  assert.equal(code, 0, JSON.stringify(json));
});

// ── 測試結果不能是空話 ─────────────────────────────────────────────

const EMPTY_TALK = ['已測試通過', '測試通過', '全部通過', '測試皆已通過', '無'];

for (const talk of EMPTY_TALK) {
  test(`測試結果只寫「${talk}」時擋下`, async (t) => {
    const stub = await withStub(t);
    const body = BODY.replace(/## 測試結果[\s\S]*$/, `## 測試結果\n\n${talk}\n`);
    const file = bodyFile(`talk-${talk}`, body);

    const { code, json } = await runFull(file, stub);

    assert.equal(code, 1);
    assert.equal(json.error.code, 'EMPTY_TEST_RESULT');
    assert.match(json.error.message, /實際跑過|手動驗證/);
    assert.deepEqual(posts(stub), []);
  });
}

test('測試結果是空的時候擋下', async (t) => {
  const stub = await withStub(t);
  const file = bodyFile('empty', BODY.replace(/## 測試結果[\s\S]*$/, '## 測試結果\n\n'));

  const { json } = await runFull(file, stub);

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

test('沒有自動化測試時，寫得出可重現的手動驗證步驟就放行', async (t) => {
  const stub = await withStub(t);
  const manual = BODY.replace(
    /## 測試結果[\s\S]*$/,
    '## 測試結果\n\n本工作包無自動化測試，手動驗證步驟：\n\n'
      + '1. 執行 `node scripts/pr-create.js --dry-run`\n'
      + '2. 確認印出的標題等於分支名\n',
  );
  const file = bodyFile('manual', manual);

  const { code, json } = await runFull(file, stub);

  assert.equal(code, 0, JSON.stringify(json));
});

// ── 停錶 ───────────────────────────────────────────────────────────

test('PR 開完之後才停錶，順序不能反', async (t) => {
  const stub = await withStub(t);
  const file = bodyFile('stop', BODY);

  await runFull(file, stub);

  assert.deepEqual(posts(stub), [
    `/api/v1/repos/${REPO}/pulls`,
    `/api/v1/repos/${ISSUE_REPO}/issues/${INDEX}/stopwatch/stop`,
  ]);
});

test('錶停在議題所在的 repo，不是 PR 所在的 repo', async (t) => {
  // claim 在工作包議題上起錶，而 PR 開在目標專案上——兩者常常不是同一個 repo。
  // 拿 PR 的 repo 去停錶，停到的是別人的議題，而自己的錶還在跑。
  const stub = await withStub(t);
  const file = bodyFile('two-repos', BODY);

  const { code, json } = await runFull(file, stub);

  assert.equal(code, 0, JSON.stringify(json));
  assert.equal(json.data.碼錶已停, true);
  assert.equal(
    posts(stub).some((path) => path.startsWith(`/api/v1/repos/${REPO}/issues/`)),
    false,
    '不該對 PR 的那個 repo 發停錶請求',
  );
});

test('沒給 --issue-repo 時，議題就在 PR 的同一個 repo 上', async (t) => {
  const stub = await withStubGitea(t, routes({
    [`POST /api/v1/repos/${REPO}/issues/${INDEX}/stopwatch/stop`]: { status: 201, body: {} },
  }));
  const file = bodyFile('same-repo', BODY);

  const { code } = await run(['--body-file', file, '--index', String(INDEX)], stub);

  assert.equal(code, 0);
  assert.ok(posts(stub).includes(`/api/v1/repos/${REPO}/issues/${INDEX}/stopwatch/stop`));
});

test('PR 開失敗時不停錶：工時要記在真的有做事的那段時間上', async (t) => {
  const stub = await withStub(t, {
    [`POST /api/v1/repos/${REPO}/pulls`]: { status: 422, body: { message: 'pull request already exists' } },
  });
  const file = bodyFile('fail', BODY);

  const { code, json } = await runFull(file, stub);

  assert.equal(code, 1);
  assert.equal(
    posts(stub).some((path) => path.endsWith('/stopwatch/stop')),
    false,
    'PR 沒開成就不該停錶',
  );
  assert.match(json.error.message, /422|already exists/);
});

test('錶本來就沒在跑時不算失敗：PR 已經開出去了', async (t) => {
  // Gitea 對「沒有碼錶在跑」回 500；這時 PR 已經建立，不該把整件事報成失敗
  const stub = await withStub(t, {
    [`POST /api/v1/repos/${ISSUE_REPO}/issues/${INDEX}/stopwatch/stop`]: {
      status: 500,
      body: { message: 'cannot stop a non existent stopwatch' },
    },
  });
  const file = bodyFile('nowatch', BODY);

  const { code, json } = await runFull(file, stub);

  assert.equal(code, 0, JSON.stringify(json));
  assert.equal(json.data.碼錶已停, false);
  assert.match(json.data.note ?? '', /碼錶/);
});

test('沒給 --index 時擋下：停錶是這一步的一部分，忘了給會讓工時算不準', async (t) => {
  const stub = await withStub(t);
  const file = bodyFile('noindex', BODY);

  const { json } = await run(['--body-file', file], stub);

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

// ── 冪等：重跑不會開出第二顆 PR ───────────────────────────────────

test('同一個 head 已經有開著的 PR 時回傳既有那一顆，不再開一顆', async (t) => {
  const stub = await withStub(t, {
    [`GET /api/v1/repos/${REPO}/pulls`]: {
      status: 200,
      body: [{ number: 7, title: HEAD, html_url: 'https://example.com/7', head: { ref: HEAD } }],
    },
  });
  const file = bodyFile('dup', BODY);

  const { code, json } = await runFull(file, stub);

  assert.equal(code, 0, JSON.stringify(json));
  assert.equal(json.data.created, false);
  assert.equal(json.data.number, 7);
  assert.equal(
    posts(stub).some((path) => path.endsWith('/pulls')),
    false,
    '既有的那一顆就是答案，不要再開一顆',
  );
});

test('已經有 PR 時照樣停錶：那一步可能是上次中斷的地方', async (t) => {
  const stub = await withStub(t, {
    [`GET /api/v1/repos/${REPO}/pulls`]: {
      status: 200,
      body: [{ number: 7, title: HEAD, html_url: 'https://example.com/7', head: { ref: HEAD } }],
    },
  });
  const file = bodyFile('dup-stop', BODY);

  const { json } = await runFull(file, stub);

  assert.equal(json.data.碼錶已停, true);
});

test('別的分支的 PR 不算數', async (t) => {
  const stub = await withStub(t, {
    [`GET /api/v1/repos/${REPO}/pulls`]: {
      status: 200,
      body: [{ number: 7, title: '別的', html_url: 'https://example.com/7', head: { ref: 'feat/別的/main' } }],
    },
  });
  const file = bodyFile('other-branch', BODY);

  const { json } = await runFull(file, stub);

  assert.equal(json.data.created, true);
});

// ── 輸入 ───────────────────────────────────────────────────────────

test('描述檔不存在時回可區分的錯誤碼', async (t) => {
  const stub = await withStub(t);

  const { json } = await run(
    ['--body-file', join(tmpRoot, '不存在的檔案.md'), '--index', String(INDEX)],
    stub,
  );

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

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

test('--dry-run 印出將建立的 PR 與將停的錶，但不碰 Gitea', async (t) => {
  const stub = await withStub(t);
  const file = bodyFile('dry', BODY);

  const { code, json } = await runFull(file, stub, ['--dry-run']);

  assert.equal(code, 0);
  assert.equal(json.data.dryRun, true);
  assert.deepEqual(
    json.data.requests.map((r) => `${r.method} ${r.path}`),
    [
      `POST /repos/${REPO}/pulls`,
      `POST /repos/${ISSUE_REPO}/issues/${INDEX}/stopwatch/stop`,
    ],
  );
  assert.equal(json.data.requests[0].body.title, HEAD, '試跑要看得到標題長什麼樣');
  assert.equal(stub.requests.length, 0);
});

test('--dry-run 照樣驗描述：不合格的描述不該等到實跑才發現', async (t) => {
  const stub = await withStub(t);
  const file = bodyFile('dry-bad', BODY.replace('## 測試結果', '## 測試結論'));

  const { json } = await runFull(file, stub, ['--dry-run']);

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