/**
 * 領取工作包的鎖。
 *
 * 錶不在這一支起——它等工作樹建好之後才由 timer.js 起動，所以這裡連帶要驗
 * 「一發起錶請求都沒有」：領取失敗或工作樹建不起來時，使用者不該被計一段
 * 什麼都沒做的時間。
 *
 * 這一支的價值全在「什麼時候擋下來」：放行的路徑只有一條，擋的理由有四種，
 * 而擋錯的代價是兩個人做同一件事、或是工時記到別顆議題上。所以決策表的四種狀態
 * 各有測試，而且每一種都要驗「一個字都沒寫進 Gitea」——擋下來卻已經改了一半，
 * 比直接放行更難收拾。
 */
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 = 11;
const ME = 'tester';

/** 議題上跑著的碼錶長什麼樣 */
const stopwatchOn = (index, repo = REPO) => ({
  issue_index: index,
  repo_owner_name: repo.split('/')[0],
  repo_name: repo.split('/')[1],
});

function routes(overrides = {}, options = {}) {
  const { assignees = [], labels = [], stopwatches = [], repoLabels } = options;

  const base = healthyRoutes(REPO, {
    'GET /api/v1/user': { status: 200, body: { login: ME } },
    [`GET /api/v1/repos/${REPO}/issues/${INDEX}`]: {
      status: 200,
      body: {
        number: INDEX,
        title: '以 sdlc-feat 領取工作包、起錶並備妥分支',
        html_url: `https://gitea.jsc.idv.tw/${REPO}/issues/${INDEX}`,
        assignees: assignees.map((login) => ({ login })),
        labels: labels.map((name, i) => ({ id: 60 + i, name })),
      },
    },
    'GET /api/v1/user/stopwatches': { status: 200, body: stopwatches },
    [`PATCH /api/v1/repos/${REPO}/issues/${INDEX}`]: { status: 201, body: {} },
    [`POST /api/v1/repos/${REPO}/issues/${INDEX}/labels`]: { status: 200, body: [] },
    [`POST /api/v1/repos/${REPO}/issues/${INDEX}/stopwatch/start`]: { status: 201, body: {} },
  });
  if (repoLabels !== undefined) {
    base[`GET /api/v1/repos/${REPO}/labels`] = {
      status: 200,
      body: repoLabels.map((name, i) => ({ id: 55 + i, name })),
    };
  }
  return { ...base, ...overrides };
}

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

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

/**
 * 會改動 Gitea 的請求；擋下來的情境裡這些一個都不該出現。
 * 前置檢查對 `issues/0` 的那一發 PATCH 不算數——它是探權限用的，打在一顆不存在的議題上，
 * 不會改動任何東西（見 lib.js 的 checkIssueWrite）。
 */
const writes = (stub) =>
  stub.requests.filter((r) => r.method !== 'GET').filter((r) => !r.path.endsWith('/issues/0'));

// ── 決策表：無鎖 ───────────────────────────────────────────────────

test('沒有鎖時放行：設 assignee、貼進行中', async (t) => {
  const stub = await withStub(t, {}, { repoLabels: ['ready-for-agent', '進行中'] });

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

  assert.equal(code, 0);
  assert.equal(json.data.assignee, ME);
  assert.deepEqual(json.data.labels, ['進行中']);
  assert.equal(json.data.碼錶中, false, '鎖上好了，錶還沒起');
  assert.equal(json.data.已認領過, false);
});

test('放行時只寫入鎖的那兩件事，一發起錶請求都沒有', async (t) => {
  const stub = await withStub(t, {}, { repoLabels: ['進行中'] });

  await run([], stub);

  assert.deepEqual(
    writes(stub).map((r) => `${r.method} ${r.path}`),
    [
      `PATCH /api/v1/repos/${REPO}/issues/${INDEX}`,
      `POST /api/v1/repos/${REPO}/issues/${INDEX}/labels`,
    ],
    '錶等工作樹建好之後才由 timer.js 起動：建不起來就中止，不該已經計了時間',
  );
});

test('assignee 送的是自己的帳號，標籤送的是 id 不是名字', async (t) => {
  const stub = await withStub(t, {}, { repoLabels: ['ready-for-agent', '進行中'] });

  await run([], stub);

  const patch = writes(stub).find((r) => r.method === 'PATCH');
  assert.deepEqual(patch.body.assignees, [ME]);

  const label = writes(stub).find((r) => r.path.endsWith('/labels'));
  assert.deepEqual(label.body.labels, [56], '進行中在假 repo 上的 id 是 56');
});

// ── 決策表：他人已認領 ─────────────────────────────────────────────

test('他人已認領時擋下，並指名是誰', async (t) => {
  const stub = await withStub(t, {}, { assignees: ['someone-else'], repoLabels: ['進行中'] });

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

  assert.equal(code, 1);
  assert.equal(json.error.code, 'CLAIMED_BY_OTHER');
  assert.match(json.error.message, /someone-else/);
  assert.deepEqual(writes(stub), [], '擋下來就不該寫進任何東西');
});

test('自己在 assignee 裡但還有別人時，一樣擋', async (t) => {
  const stub = await withStub(t, {}, { assignees: [ME, 'someone-else'], repoLabels: ['進行中'] });

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

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

// ── 決策表：自己的碼錶在跑 ─────────────────────────────────────────

test('自己碼錶跑在本議題時擋下，要求先手動停錶', async (t) => {
  const stub = await withStub(t, {}, {
    stopwatches: [stopwatchOn(INDEX)],
    repoLabels: ['進行中'],
  });

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

  assert.equal(code, 1);
  assert.equal(json.error.code, 'STOPWATCH_ON_THIS_ISSUE');
  assert.match(json.error.message, /停/, '要說清楚下一步是手動停錶');
  assert.match(json.error.message, /工作樹/, '要明說停錶不會動到既有的工作樹');
  assert.deepEqual(writes(stub), []);
});

test('自己碼錶跑在別的議題時擋下，並指出是哪一顆', async (t) => {
  const stub = await withStub(t, {}, {
    stopwatches: [stopwatchOn(7)],
    repoLabels: ['進行中'],
  });

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

  assert.equal(code, 1);
  assert.equal(json.error.code, 'STOPWATCH_ON_OTHER_ISSUE');
  assert.match(json.error.message, /#7/, '忘了停掉的是哪一顆，要指名');
  assert.match(
    json.error.message,
    /停錶只停計時，不會動到任何既有的工作樹/,
    '以為停錶等於放棄那顆工作包的人會寧可不停，工時就記到別顆去了',
  );
  assert.deepEqual(writes(stub), []);
});

test('別的 repo 上的同號碼錶也算自己有錶在跑', async (t) => {
  const stub = await withStub(t, {}, {
    stopwatches: [stopwatchOn(INDEX, 'plugins/別的專案')],
    repoLabels: ['進行中'],
  });

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

  assert.equal(json.error.code, 'STOPWATCH_ON_OTHER_ISSUE');
  assert.match(json.error.message, /別的專案/);
});

// ── 冪等：中斷後重跑 ───────────────────────────────────────────────

test('自己已認領但沒有錶時放行，並如實說這顆本來就是自己的', async (t) => {
  const stub = await withStub(t, {}, { assignees: [ME], repoLabels: ['進行中'] });

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

  assert.equal(code, 0);
  assert.equal(json.data.已認領過, true);
  assert.equal(json.data.碼錶中, false, '重跑時鎖照樣補齊，錶則仍舊留到工作樹建好之後');
});

test('進行中標籤已經在議題上時不重複貼', async (t) => {
  const stub = await withStub(t, {}, {
    assignees: [ME],
    labels: ['進行中'],
    repoLabels: ['進行中'],
  });

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

  assert.equal(json.data.已認領過, true);
  assert.deepEqual(json.data.labels, ['進行中']);
  assert.equal(
    writes(stub).some((r) => r.path.endsWith('/labels')),
    false,
    '已經貼著的標籤不必再貼一次',
  );
});

// ── 標籤：本 plugin 不自動建立標籤 ─────────────────────────────────

test('repo 上沒有進行中標籤時擋在寫入之前，並指出該去建哪一個', async (t) => {
  const stub = await withStub(t, {}, { repoLabels: ['ready-for-agent'] });

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

  assert.equal(code, 1);
  assert.equal(json.error.code, 'LABEL_NOT_FOUND');
  assert.match(json.error.message, /進行中/);
  assert.deepEqual(writes(stub), [], '標籤缺了就整件事不做，不要只設一半的鎖');
});

// ── 錯誤 ───────────────────────────────────────────────────────────

test('議題不存在時回傳可區分的錯誤碼', async (t) => {
  const stub = await withStub(t, {
    [`GET /api/v1/repos/${REPO}/issues/${INDEX}`]: { status: 404, body: { message: 'not found' } },
  }, { repoLabels: ['進行中'] });

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

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

test('--index 不是正整數時擋在打 Gitea 之前', async (t) => {
  const stub = await withStub(t, {}, { repoLabels: ['進行中'] });

  const { json } = await runScript('claim.js', ['--repo', REPO, '--index', '0'], {
    env: envFor(stub),
  });

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

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

test('--dry-run 印出將發出的寫入，但一個字都不寫進去', async (t) => {
  const stub = await withStub(t, {}, { repoLabels: ['進行中'] });

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

  assert.equal(code, 0);
  assert.equal(json.data.dryRun, true);
  assert.deepEqual(
    json.data.requests.map((r) => `${r.method} ${r.path}`),
    [
      `PATCH /repos/${REPO}/issues/${INDEX}`,
      `POST /repos/${REPO}/issues/${INDEX}/labels`,
    ],
  );
  assert.deepEqual(writes(stub), [], '預覽不得真的寫入');
});

test('--dry-run 會先讀現況：預覽出來的是這一顆實際的處境', async (t) => {
  // 手寫一份固定的清單很容易跟實作走鐘，而且說不出「這顆已經是你的了」這種事
  const stub = await withStub(t, {}, { repoLabels: ['進行中'] });

  await run(['--dry-run'], stub);

  const reads = stub.requests.filter((r) => r.method === 'GET').map((r) => r.path);
  assert.ok(reads.includes('/api/v1/user'));
  assert.ok(reads.includes(`/api/v1/repos/${REPO}/issues/${INDEX}`));
  assert.ok(reads.includes('/api/v1/user/stopwatches'));
  assert.ok(reads.includes(`/api/v1/repos/${REPO}/labels`));
});

test('--dry-run 略過已經做好的部分：鎖都在了就什麼都不必寫', async (t) => {
  const stub = await withStub(t, {}, {
    assignees: [ME],
    labels: ['進行中'],
    repoLabels: ['進行中'],
  });

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

  assert.deepEqual(
    json.data.requests,
    [],
    'assignee 與標籤都已經到位，中斷重跑就是走到這裡；手寫一份固定的清單會謊報',
  );
});

test('--dry-run 在鎖擋得住的情況下照樣擋，這才是預覽的用處', async (t) => {
  const stub = await withStub(t, {}, { assignees: ['someone-else'], repoLabels: ['進行中'] });

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

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

test('--dry-run 遇到缺標籤一樣報錯，不會等到實跑才發現', async (t) => {
  const stub = await withStub(t, {}, { repoLabels: ['ready-for-agent'] });

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

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