import { test, afterEach } from 'node:test';
import assert from 'node:assert/strict';
import { GiteaClient } from './gitea.js';

const realFetch = globalThis.fetch;
afterEach(() => { globalThis.fetch = realFetch; });

function makeClient() {
  return new GiteaClient({
    serverUrl: 'https://gitea.example',
    owner: 'o',
    repo: 'r',
    token: 't',
  });
}

/** 建立假的 fetch，依序回傳給定的回應。 */
function stubFetch(responses) {
  const calls = [];
  globalThis.fetch = async (url, opts) => {
    calls.push({ url, opts });
    const r = responses.shift();
    return {
      ok: r.status >= 200 && r.status < 300,
      status: r.status,
      text: async () => (r.body == null ? '' : JSON.stringify(r.body)),
    };
  };
  return calls;
}

test('createPull: 成功建立回傳 created=true', async () => {
  stubFetch([{ status: 201, body: { number: 7, html_url: 'u' } }]);
  const { pull, created } = await makeClient().createPull({
    head: 'feature', base: 'develop', title: 't', body: 'b',
  });
  assert.equal(created, true);
  assert.equal(pull.number, 7);
});

test('createPull: 422 已存在時回查既有 PR，created=false', async () => {
  stubFetch([
    { status: 422, body: { message: 'already exists' } },
    { status: 200, body: [
      { number: 3, head: { ref: 'feature' }, base: { ref: 'develop' } },
    ] },
  ]);
  const { pull, created } = await makeClient().createPull({
    head: 'feature', base: 'develop', title: 't', body: 'b',
  });
  assert.equal(created, false);
  assert.equal(pull.number, 3);
});

test('createPull: 422 但查無對應 PR 時丟出錯誤', async () => {
  stubFetch([
    { status: 422, body: { message: 'bad' } },
    { status: 200, body: [] },
  ]);
  await assert.rejects(
    () => makeClient().createPull({ head: 'feature', base: 'develop', title: 't', body: 'b' }),
    /建立 PR 失敗/,
  );
});

test('createPull: 其他錯誤狀態碼直接丟出', async () => {
  stubFetch([{ status: 500, body: { message: '伺服器錯誤' } }]);
  await assert.rejects(
    () => makeClient().createPull({ head: 'feature', base: 'develop', title: 't', body: 'b' }),
    /建立 PR 失敗 \(500\)/,
  );
});

test('findOpenPull: 非陣列回應回傳 null', async () => {
  stubFetch([{ status: 200, body: { unexpected: true } }]);
  const r = await makeClient().findOpenPull('feature', 'develop');
  assert.equal(r, null);
});