/**
 * 需求議題底下的工作包清單。
 *
 * 這一支存在的理由只有一個：使用者手上有一顆需求議題編號，要挑出底下的某一顆工作包。
 * 所以測試集中在「挑得對不對」：認的是不是工作包抽取那一套關聯判準、PR 會不會混進來、
 * 清單讀不讀得完。半份清單最危險——使用者會從缺了幾顆的清單裡挑，而且看不出缺了誰。
 */
import test from 'node:test';
import assert from 'node:assert/strict';
import { runScript } from './helpers/run-script.js';
import { healthyRoutes, stubEnv as envFor, withStubGitea } from './helpers/stub-gitea.js';

const REPO = 'plugins/tea-sdlc';
const REQUIREMENT = 7;

/** 一顆工作包的 body：判準只在「關聯」段落那一行 */
function wpBody(requirement) {
  return `## 這個工作包在做什麼

一句話。

## 待辦

- [ ] 做一件事

## 關聯

需求議題：#${requirement}
估算人天：2
`;
}

function issue(index, { title = `工作包 ${index}`, body = wpBody(REQUIREMENT), ...rest } = {}) {
  return {
    number: index,
    title,
    body,
    state: 'open',
    html_url: `https://gitea.example/${REPO}/issues/${index}`,
    assignee: null,
    ...rest,
  };
}

/** 假 Gitea：議題清單逐頁回，其餘走 healthy 預設 */
function routes(issues, overrides = {}) {
  return healthyRoutes(REPO, {
    [`GET /api/v1/repos/${REPO}/issues`]: (req) => {
      const page = Number(req.query.page ?? 1);
      const limit = Number(req.query.limit ?? 50);
      return { status: 200, body: issues.slice((page - 1) * limit, page * limit) };
    },
    ...overrides,
  });
}

async function run(t, issues, args = []) {
  const stub = await withStubGitea(t, routes(issues));
  const result = await runScript(
    'wp-list.js',
    ['--repo', REPO, '--requirement', String(REQUIREMENT), ...args],
    { env: envFor(stub) },
  );
  return { stub, ...result };
}

// ── 挑出哪幾顆 ─────────────────────────────────────────────────────

test('只收關聯指回這顆需求議題的工作包', async (t) => {
  const { code, json } = await run(t, [
    issue(9),
    issue(10, { body: wpBody(99) }),
    issue(11),
  ]);

  assert.equal(code, 0);
  assert.deepEqual(
    json.data.工作包.map((wp) => wp.index),
    [9, 11],
  );
  assert.equal(json.data.數量, 2);
  assert.equal(json.data.需求議題, REQUIREMENT);
});

test('沒有關聯段落的議題不算工作包', async (t) => {
  const { json } = await run(t, [issue(9), issue(12, { body: '## 總覽\n\n這是一顆需求議題。\n' })]);

  assert.deepEqual(json.data.工作包.map((wp) => wp.index), [9]);
});

test('PR 不進清單，即使它的描述也寫了需求議題', async (t) => {
  // pr-create 產出的 PR 描述本來就有「需求議題：#N」那一行，光看 body 會把 PR 當成工作包
  const { json } = await run(t, [
    issue(9),
    issue(30, { title: 'feat: 某某', pull_request: { merged: false } }),
  ]);

  assert.deepEqual(json.data.工作包.map((wp) => wp.index), [9]);
});

test('已關閉的工作包照樣列出，並帶上狀態與領取人', async (t) => {
  const { json } = await run(t, [
    issue(9, { state: 'closed', assignee: { login: 'jeffery' } }),
  ]);

  assert.deepEqual(json.data.工作包, [
    {
      index: 9,
      title: '工作包 9',
      url: `https://gitea.example/${REPO}/issues/9`,
      state: 'closed',
      assignee: 'jeffery',
    },
  ]);
});

test('依編號由小到大排，清單的順序不隨 Gitea 回傳順序飄動', async (t) => {
  const { json } = await run(t, [issue(14), issue(9), issue(11)]);

  assert.deepEqual(json.data.工作包.map((wp) => wp.index), [9, 11, 14]);
});

test('一顆都沒有時回空清單而不是報錯', async (t) => {
  const { code, json } = await run(t, [issue(10, { body: wpBody(99) })]);

  assert.equal(code, 0);
  assert.deepEqual(json.data.工作包, []);
  assert.equal(json.data.數量, 0);
});

test('逐頁讀完，不只讀第一頁', async (t) => {
  const many = Array.from({ length: 60 }, (_, i) => issue(i + 1));

  const { json, stub } = await run(t, many);

  assert.equal(json.data.數量, 60);
  const listings = stub.requests.filter((r) => r.path === `/api/v1/repos/${REPO}/issues`);
  assert.ok(listings.length >= 2, `要翻到第二頁，實際只發了 ${listings.length} 次`);
});

test('讀的是全部狀態的議題，不只 open', async (t) => {
  const { stub } = await run(t, [issue(9)]);

  const listing = stub.requests.find((r) => r.path === `/api/v1/repos/${REPO}/issues`);
  assert.equal(listing.query.state, 'all');
});

// ── 契約 ───────────────────────────────────────────────────────────

test('--dry-run 列出將發出的請求，且完全不碰 Gitea', async (t) => {
  const stub = await withStubGitea(t, routes([issue(9)]));

  const { code, json } = await runScript(
    'wp-list.js',
    ['--repo', REPO, '--requirement', String(REQUIREMENT), '--dry-run'],
    { env: envFor(stub) },
  );

  assert.equal(code, 0);
  assert.equal(json.data.dryRun, true);
  assert.deepEqual(json.data.requests, [
    { method: 'GET', path: `/repos/${REPO}/issues` },
  ]);
  assert.equal(stub.requests.length, 0);
});

test('缺 --requirement 時指名缺的是哪一個', async (t) => {
  const stub = await withStubGitea(t, routes([]));

  const { json } = await runScript('wp-list.js', ['--repo', REPO], { env: envFor(stub) });

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

test('--requirement 不是正整數時擋下', async (t) => {
  const stub = await withStubGitea(t, routes([]));

  const { json } = await runScript('wp-list.js', ['--repo', REPO, '--requirement', 'abc'], {
    env: envFor(stub),
  });

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

test('議題多到翻不完時報錯，不回半份清單', async (t) => {
  // 每一頁都回滿頁，永遠不會結束：翻到上限就要大聲說讀不完
  const stub = await withStubGitea(
    t,
    healthyRoutes(REPO, {
      [`GET /api/v1/repos/${REPO}/issues`]: (req) => ({
        status: 200,
        body: Array.from({ length: Number(req.query.limit ?? 50) }, (_, i) => issue(i + 1)),
      }),
    }),
  );

  const { code, json } = await runScript(
    'wp-list.js',
    ['--repo', REPO, '--requirement', String(REQUIREMENT)],
    { env: envFor(stub) },
  );

  assert.equal(code, 1);
  assert.equal(json.error.code, 'WORK_PACKAGE_LIMIT');
});