/**
 * 掛 Milestone、寫截止日、記人天估算。
 * 三件事都經同一個 PATCH 送出，因為它們常常要一起改，分開發等於多兩次往返。
 */
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 INDEX = 12;
const BODY = '## 這個工作包在做什麼\n\n一句話。\n\n## 關聯\n\n需求議題：#1\n';

function routes(overrides = {}, { body = BODY } = {}) {
  return healthyRoutes(REPO, {
    [`GET /api/v1/repos/${REPO}/issues/${INDEX}`]: {
      status: 200,
      body: { number: INDEX, title: '領取工作包並備妥分支', body, html_url: 'https://example.com/12' },
    },
    [`GET /api/v1/repos/${REPO}/milestones`]: {
      status: 200,
      body: [
        { id: 3, title: '第一階段' },
        { id: 4, title: '第二階段' },
      ],
    },
    [`PATCH /api/v1/repos/${REPO}/issues/${INDEX}`]: (req) => ({
      status: 200,
      body: { number: INDEX, ...req.body },
    }),
    ...overrides,
  });
}

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

const run = (args, stub) =>
  runScript('issue-update.js', ['--repo', REPO, '--index', String(INDEX), ...args], {
    env: envFor(stub),
  });

const patchOf = (stub) => stub.requests.find((r) => r.method === 'PATCH' && !r.path.endsWith('/0'));

// ── Milestone ─────────────────────────────────────────────────────

test('以名稱指定 Milestone，送出時換成 id', async (t) => {
  const stub = await withStub(t);

  const { code, json } = await run(['--milestone', '第二階段'], stub);

  assert.equal(code, 0, JSON.stringify(json));
  assert.equal(patchOf(stub).body.milestone, 4);
});

test('Milestone 不存在時中止，並列出可選的', async (t) => {
  const stub = await withStub(t);

  const { code, json } = await run(['--milestone', '第三階段'], stub);

  assert.equal(code, 1);
  assert.equal(json.error.code, 'UNKNOWN_MILESTONE');
  assert.match(json.error.message, /第三階段/);
  assert.match(json.error.message, /第一階段/, '要列出可選的');
  assert.equal(stub.requests.some((r) => r.method === 'PATCH' && !r.path.endsWith('/0')), false);
});

test('不建立 Milestone：沒有任何請求寫到 milestones 端點', async (t) => {
  const stub = await withStub(t);

  await run(['--milestone', '第一階段'], stub);

  const writes = stub.requests.filter((r) => r.path.endsWith('/milestones') && r.method !== 'GET');
  assert.deepEqual(writes, []);
});

// ── 截止日 ─────────────────────────────────────────────────────────

test('截止日以 RFC3339 送出', async (t) => {
  const stub = await withStub(t);

  await run(['--due-date', '2026-09-24'], stub);

  assert.equal(patchOf(stub).body.due_date, '2026-09-24T00:00:00Z');
});

test('截止日格式不對時擋在打 Gitea 之前', async (t) => {
  const stub = await withStub(t);

  const { json } = await run(['--due-date', '2026/09/24'], stub);

  assert.equal(json.error.code, 'BAD_DUE_DATE');
  assert.equal(stub.requests.length, 0);
});

// ── 人天估算 ───────────────────────────────────────────────────────

test('人天估算寫成議題 body 裡人類可讀的一行', async (t) => {
  const stub = await withStub(t);

  await run(['--estimate-days', '3'], stub);

  assert.match(patchOf(stub).body.body, /^估算人天：3$/m);
});

test('估算寫進關聯段落，不是隨便黏在檔尾', async (t) => {
  const stub = await withStub(t);

  await run(['--estimate-days', '3'], stub);

  const updated = patchOf(stub).body.body;
  const relation = updated.slice(updated.indexOf('## 關聯'));
  assert.match(relation, /需求議題：#1/);
  assert.match(relation, /估算人天：3/);
});

test('重跑改估算時就地更新那一行，不會累積成兩行', async (t) => {
  const stub = await withStub(t, {}, {
    body: '## 關聯\n\n需求議題：#1\n估算人天：3\n',
  });

  await run(['--estimate-days', '5'], stub);

  const updated = patchOf(stub).body.body;
  assert.equal((updated.match(/估算人天：/g) ?? []).length, 1);
  assert.match(updated, /估算人天：5/);
});

test('估算沒有變時不重寫 body', async (t) => {
  const stub = await withStub(t, {}, {
    body: '## 關聯\n\n需求議題：#1\n估算人天：3\n',
  });

  await run(['--estimate-days', '3'], stub);

  assert.equal('body' in patchOf(stub).body, false, '沒變就不該把 body 塞進 PATCH');
});

test('人天必須是正數', async (t) => {
  const stub = await withStub(t);

  const { json } = await run(['--estimate-days', '0'], stub);

  assert.equal(json.error.code, 'BAD_ESTIMATE');
  assert.equal(stub.requests.length, 0);
});

test('議題沒有關聯段落時，估算補在 body 結尾而不是靜靜消失', async (t) => {
  const stub = await withStub(t, {}, { body: '## 描述\n\n沒有關聯段落的議題。\n' });

  await run(['--estimate-days', '2'], stub);

  assert.match(patchOf(stub).body.body, /估算人天：2/);
});

// ── 一起送 ─────────────────────────────────────────────────────────

test('三件事一次 PATCH 送出', async (t) => {
  const stub = await withStub(t);

  await run(['--milestone', '第一階段', '--due-date', '2026-09-24', '--estimate-days', '2'], stub);

  const patches = stub.requests.filter((r) => r.method === 'PATCH' && !r.path.endsWith('/0'));
  assert.equal(patches.length, 1);
  assert.equal(patches[0].body.milestone, 3);
  assert.equal(patches[0].body.due_date, '2026-09-24T00:00:00Z');
  assert.match(patches[0].body.body, /估算人天：2/);
});

test('什麼都沒指定時中止，不發空的 PATCH', async (t) => {
  const stub = await withStub(t);

  const { code, json } = await run([], stub);

  assert.equal(code, 1);
  assert.equal(json.error.code, 'NOTHING_TO_UPDATE');
  assert.equal(stub.requests.length, 0);
});

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

test('--dry-run 列出將送出的 PATCH，且不寫入', async (t) => {
  const stub = await withStub(t);

  const { code, json } = await run(['--milestone', '第一階段', '--due-date', '2026-09-24', '--dry-run'], stub);

  assert.equal(code, 0);
  assert.equal(json.data.dryRun, true);
  assert.equal(json.data.requests.length, 1);
  assert.equal(json.data.requests[0].body.milestone, 3, '預覽要看得出 Milestone 已解析成 id');
  assert.equal(stub.requests.some((r) => r.method !== 'GET'), false);
});